BD/Controls Copper Repeater Systems
This document provides enough information to acquaint the reader with the copper-based CAMAC and timing link repeater systems. It is intended primarily as an aid to diagnostics and repair of failures. The document begins with a general system wide description, followed by a more detailed description of the links for each of the separate machines. Next is a most detailed description of each type of repeater module including an alignment procedure. The document includes development history in as much as this is required to understand the systems as they now exist. The appendices include a definition of terms, maps of the links for each machine and electrical schematics of the repeater modules.
The copper repeater system (system) supports CAMAC and timing signal distributions in the BSTR, PBAR, TEV and SWYD. It includes the MCR, MAC Room, Comp. Room, CHL, CDF at B0, CDF at D0, CUB, the two Recycler Ring “peanuts”, E4R and tests facilities at the Linac Annex labs, the Transfer-Gallery second floor and the Transfer-Gallery micro-pit. The signals supported include PIOX, PIOR, BTR, TCLK, TVBS, APTVBS, MIBS (formerly MRBS), MDAT (L), MDAT (G) and various Abort/Beam Permit signals. Usually only the required sub-set of signals are made available at any given location.
At one time there were links that supported all remote consoles (PIOXC and PIORC) and links that supported the Main Ring RF and Tevatron RF (TRF) at F0. All of these have been replaced by Network based architectures. A proposal is pending to replace the CAMAC signals now supported by the TEV link with Network based architecture. There is a companion proposal to replace the remainder of the TEV links with a fiber optic based repeater system. Use of the SWYD links will be minimized when the fixed target areas are decommissioned. Any prospect to obsolete the other CAMAC portions of the copper links is long term because appropriate fiber optic infrastructure does not exist and has not been formally proposed. The fiber cable connecting the MAC Room with AP-10 intended for future CAMAC and timing links for PBAR has been ceded to the Network group. Network configurations are not appropriate for the precision and time-of-flight needs of timing signals. For the foreseeable future some portions of the copper based repeater systems will continue to be needed.
The systems consist of custom card cages (bins) housing custom repeater modules (modules). These are connected together by coaxial cables. Inter-building connections use combinations of 1/4, 3/8 and 1/2 inch Andrew Heliax’ and CableWave Welflex and sometimes use RG-213 cables. At many locations there are custom capacitor coupling boxes connected in series with the transmit signal. These are used to decouple externally induced DC currents. Intra-building connections use RG-58 and occasionally RG-174 or RG-213 cables. There is some use of 75 ohm cables.
The versatility of the systems has allowed many and frequent reconfigurations as needs changed. It has not always been possible to maintain separation of the links for the different machines. It is not unusual to find inaccurate labeling. There is a proliferation of connector adapters. The documentation has not kept pace with the reconfigurations. Some unused equipment is still installed.
The protocol for all signals is a modified Manchester code wherein a mid-cell transition is “1” and the absence of a mid-cell transition is “0”. For all signals except TVBS, APTVBS and MIBS (BSCLK’s) the cell boundary is nominally 100 ns (10 MHz). For the BSCLK’s the cell boundary is nominally 132 ns (7.5 MHz). The PIOX, PIOR, BTR and MDAT signals are burst mode such that the signal voltage is nominally zero and no transitions occur when information is not being transmitted. Usually the inter-building links use RF modulation and the intra-building links are TTL level. The RF modulation is nominally a 50 MHz highly distorted sign wave. This RF is locally generated at each module and the frequency is not intended to be stable. Uninformed people often erroneously assume that there is a relation between the repeater system RF and the actual machines RF. This relationship exists with the some fiber based BSCLK repeater systems but does not exist with the copper-based systems.
The modules are always mounted in custom 12-wide 5 1/4 inch high NIM bins. All bins have a custom 2-wide +/- 5 volt power supply in slots 11/12. The standard bins can support up to ten 1-wide modules. There are some bins that are further customized to support a 2-wide +24 volt power supply in slots 9/10 that is needed for 2-wide RF power amplifier module(s). All connections are made through the bin back panel. For each slot the standard bin has one main input, one main output and four local in/out connectors. The main connectors are TNC for RF and BNC for DC. The local connectors are LEMO. A given repeater module can support only one intra-building (RF) plus four (sometimes five) inter-building (DC) connections. It is common to daisy-chain modules and bins to provide additional connections for branching or local capacity.
The bins and modules use mating Amp type M blind connectors with guide pins/sockets and shields. Position of the guides is always the same and there is no use of keying. There is much mechanical assembly slop and it is too easy to damage the coaxicon contacts in these connectors. It is necessary to have a “feel” and sometimes necessary to temporarily loosen the guides when inserting a module into a bin. Only one universal custom hand built extender exist.
There exist a total of nineteen different types of repeater modules. Many of these types have several generations of modification and update. The modifications are usually not apparent without close internal inspection of the module.
The MDAT (L) signal (all frames sourced by TECAR) from a bin in A2 uses one 1/2-inch Heliax’ connected at the MCR NE patch. RG-58 is used between the patch and the MCRR30 bin.
The now unused MDAT (L) signal (formerly MECAR) from a bin in the Transfer Gallery at TG-7 (A0-2) used one 1/2-inch Heliax’ (KCL-006) connected at the MCR NE patch. RG-58 is still connected between the patch and the MCRR30 bin. There is a unused spare 1/2-inch Heliax’ (KCL-007).
The MDAT (L) signal (all frames sourced at MI-60N, MI-60CR and F0S) from a bin in the MAC Room (SY-MAC2) uses one RG-213 connected to the MCRR30 bin.
There is one unused RG-213 connecting between the MCRR30 TEP and the NTF racks in the lower LINAC Gallery. This was formerly for TCLK to NTF and PREAC.
The BSTR link with a bin at LG-1 supports PIOX, PIOR, BTR and TCLK. RG-58 is used between the bins in MCRR30 and the MCR NE patch and 3/8-inch Heliax’ is used between the patch and LG-1.
There are two unused 3/8-inch Heliax’ connecting between the MCR NE patch and BSTR LLRF. BEGRF Spare 1 terminates at the TEP of rack BLLRF-4. BEGRF Spare 2 terminates at the TEP of rack BLLRF-3. These are not used.
There are two unused 1/2-inch Welflex connecting with the TEP for BSTR rack G11-RR5-1 (ECE).
The PBAR link with a bin (10-P) at the AP-10 Control Room supports PIOX, PIOR, BTR, TCLK, HLPI and HLPO (beam permit). RG-58 is used between the MCRR30 bins and the MCR NE patch. 1/2-inch Welflex (EC5 through EC10 respectively) is used between the patch and the TEP of rack A14R03 at AP-10.
There are three RG-58 connecting between bins in MCRR30 and the MAC Room rack #16 TEP. These support PBAR PIOX, PIOR and BTR to crate $01 in the MAC Room rack #17.
There are four 1/2-inch Welflex (EC1 through EC4, formerly consoles #1 and #2 at AP-10) connecting between the MCR NE patch and the TEP of rack A14R03 at AP-10. EC1, EC2 and EC3 are not used, EC4 is used by Network Ethernet.
The MDAT (G) signal to a bin (10-3) at AP-10 uses RG-58 between the MCRR30 bin and the MCR NE patch. 1/2-inch Welflex (EC153, formerly PIOXB) is used between the patch and the TEP of rack B16R01 at AP-10. There is a unused spare 1/2-inch Welflex (EC154, formerly PIORB).
There are two 1/2-inch Welflex connecting between the MCR NE patch and the TEP of rack A14R02 at the AP-10 Control Room. EC12 is not used. EC11 was intended for BSTR RF in support of the now decommissioned AP-4 beam line. At the MCR NE patch EC11 is jumped to a 3/8-inch Heliax’ (PBAR RF) connected with BSTR LLRF (mid-air splice to RG-58 above racks BLLRF-3 and BLLRF-4). At AP-10 EC11 is jumped using RG-58 to 1/2-inch Welflex FA71CL at the rack A14R05 TEP. FA71CL is connected with a patch in rack B55R04 at AP-50 and from the patch to the ARF3 LL system.
There are two 1/2-inch Welflex connecting between the MCR NE patch and the TEP of rack A14R05 at the AP-10 Control Room. FD50 is not used. FD51 was intended for BSTR Extraction Sync. (BES) in support of the now decommissioned AP-4 beam line. This BES is sourced by a modified C178 in SWYD crate $08 slot 14 in the MAC Room. Connection is via RG-58 to the MCR NE patch. At AP-10 FD51 is jumped to 1/2-inch Welflex FA78CL inside the rack A14R05 TEP. FA78CL is connected with rack B55R04 at AP-50 and the ARF3 LL system. The modified C178 in the MAC Room also sources BES to the LBOE (little bit of everything) module in the TLG (time line generator) system, a C279 for processing the request for TCLK $7C, and to BLLRF for the Gap Producer (a holdover from the AP-4 beam line).
There are two 1/2-inch Welflex connecting between the MCR NE patch and the TEP of rack B34R05 (30-2) at AP-30. EC72 and EC73 are not used. These were formerly intended for a console #4 at AP-30, which was never installed.
There are two 1/2-inch Welflex connecting between the MCR NE patch and a patch panel mounted on the cable tray along the outside periphery of the beam enclosure beneath AP-30. EC74 and EC75 are not used. They were formerly for console #3.
There are four 1/2-inch Welflex between the MCR NE patch area (not connected to the patch) and rack A14R05 (not connected at the TEP) at the AP-10 Control Room. EC155, EC156 and EC158 are not used. EC157 is used for requesting TCLK $9C (sudden beam loss). In the MCR in the tray above rack MCRR27 EC157 is spliced to RG-213. The RG-213 routes via tray to the patch system in the MCR Northwest corner, rack #61 spigot #77. The “operations patch system” is used to connect with the MAC Room at a patch (A) above and behind rack #15. At AP-10 EC157 is connected via RG-58 to a NIM module in a crate in rack A14R02.
There are three 3/8-inch Welflex between the MCR NE patch area (not connected to the patch) and rack A14R05 (not connected at the TEP) at the AP-10 Control Room. IC628 through IC630 are not used.
A TEV link branch (DC) supports PIOX, PIOR, BTR and TCLK for crate $FE at the micro pit in the Transfer-Gallery (TGS-120). RG-58 is used between the bins (TCLK via fan-out box) in MCRR30 and the MCR NE patch and 3/8-inch Heliax’ is used between the patch and the micro-pit. There is a tape-wound core panel in the Micro Pit.
The SWYD link (via TG-9) uses six individual 1/4-inch Heliax’ between the MCRR30 bins (type TNC termination) and a patch panel in an “end rack” mounted on the East wall inside the MAC Room (MAC East patch). The supported signals are PIOX, PIOR, BTR, TCLK and MDAT (G). TVBS was formerly supported (the cabling Downstream of TG-9 is now used for SWIX Arcnet). There is one RG-213 (violet color code) formerly used for SWYD Beam Permit connecting between MCRR30 and the MAC East patch.
The SWYD-U link with a bin (SY-MAC1) in the MAC Room (rack #17) supports (DC) PIOX, PIOR, BTR, TCLK, MIBS, TVBS and MDAT (G). RG-58 is used between the bins in MCRR30 and the MCR NE patch and RG-213 is used between the patch and the MAC Room.
There are four RG-213 connecting with a patch panel in the “end rack” at the West end of the MAC Room (MAC West patch). Three of these are not connected and coiled near the MCR NE patch but they have enough slack length to allow for connection to MCRR30. The fourth is connected to a bin in MCRR30 but is not used. It was formerly used to provide the Linac Annex labs with MRPSL (Main Ring Power Supply Link).
There are four RG-213 cables connecting with the MAC East patch that are part of the “tune” system.
There are six cables (KCD-Z037 through KCD-Z042) used by the cryogenic system.
The SY-MAC1 bin is in rack #17. Note that the silk-screened labels on the bin back panel are not correct. This bin supports input/output connections with the MCR and Linac Annex bins. It supports local connections with the SY-MAC2 bin and the FMI fiber bins in rack #13. It supports some local distribution within the MAC Room.
Eight RG-213 connect between the rack #17 TEP (type N) and the MCR NE patch. Five support (DC) the (SWYD-U) PIOX, PIOR, BTR, TCLK (from MCR) and MDAT (G). Two support MIBS and TVBS, which are unused backups (terminated with 50 ohm). One supports TCLK (to MCR), which is sourced from the C176 in SWYD $06 slot 21, rack #16. RG-58 is used between the bin and TEP.
Two RG-58 connect with the FMI fiber bin in rack #13. These source (DC) the BSCLK’s, MIBS (or) RRBS and TVBS to the SY-MAC1 bin. These do not connect via TEP’s.
Local distribution supports PIOX, PIOR and BTR for SWYD crates $05, $06, $07, $08 and $09 using RG-58.
Local distribution supports TCLK to QXR, to a C377 in PBAR crate $01 slot 4, and the tune system in rack #5 using RG-58.
Local distribution supports MDAT (G) to a C178 in PBAR crate $01 slot 23, to UCD-B, and the tune system in rack #5 using RG-58.
Local distribution supports TVBS to KTEV via the Research Division fiber system in rack #6, and to a C278 in SWYD crate $09 slot 20.
Three RG-58 support (DC) the PIOX, PIOR and BTR connection with the SY-MAC2 bin in rack #13.
Seven RG-59 (75 ohm) connect between the rack #17 TEP (type BNC) and the MAC West patch. 75/50 ohm matching transformers are used at the receiving module inputs.
MAC Room rack #16: There is a C176 module in SYWD crate $06 slot 21. This is the distribution source (DC) for all TCLK. Channel #1 is for TCLK to the MCR via RG-58 and rack #16 TEP. Channels #2 and #3 are for TCLK to three “Bridges” fan-out boxes (modified for TCLK only, no MDAT) in the bottom rear of rack #16. Channel #4 is for TCLK to the FMI fiber system in rack #13. Local distribution from the fan-out boxes includes TCLK to the SY-MAC2 bin via the rack #13 TEP and separately TCLK for the Research Division (RD) fiber system.
Two RG-213 connect between the rack #16 TEP and the GMPS (Gradient Magnet Power Supply) system in the BSTR West Gallery. These are for the 15 Hz Sync to GMPS and the BMIN from GMPS. There is a patch panel for these signals at the top front of rack #16.
Two unused 3/8-inch Heliax’ route between the rack #16 TEP and the MCR 19c patch (utility tunnel East of the MAC Room). #18 Down is connected at the 19c patch and was intended for a Sync. Signal from the Master Substation. #16 Up is not connected. Note: A third 3/8-inch Heliax is routed from the 19c patch and is spliced to a RG-58 in the tray above the aisle near rack #24 in the MAC Room. This cable is not connected at the 19c patch and the intended use is not known. The far end of the RG-58 is not known.
There are two unused (spare1 and spare2) RG-58 routed between MAC Room rack #16 and the MCR rack MCRR30. There are two unused (NTF Req. and NTF TCLK) RG-58 routed between the MAC Room rack #16 and the “NTF Control Room”.
There are three RG-58 connected between MAC Room rack #16 TEP and bins in MCRR30. These support PBAR PIOX, PIOR and BTR for crate $01 in MAC Room rack #17.
MAC Room rack #15: BSTR Extraction Sync (BES) intended for support for the PBAR end of the now decommissioned AP-4 beam line. is fanned out from a modified C178 in SWYD crate $08 slot 14 in the MAC Room. Connection from a patch in the bottom rear of MAC Room rack #15 is via RG-58 to FD51 at the MCR NE patch. The modified C178 in the MAC Room also sources BES to the LBOE (little bit of everything) module in the TLG (time line generator) system, a C279 for processing the request for TCLK $7C, and to BLLRF for the Gap Producer (also a holdover from the AP-4 beam line).
The SY-MAC2 bin is in rack #13. PIOX, PIOR and BTR connections with the SY-MAC1 bin are via the rack #13 TEP using RG-58. TCLK from the rack #16 fan-out is via the rack #13 TEP using RG-58.
The FMI fiber system sourced MDAT (L) is connected to this bin (slot 9). The MDAT (L) from SY-MAC2 to MCRR30 uses direct bin-to-bin RG-213.
The SY-MAC2 bin (slot 7) sources TCLK (DC) for the entire LINAC, PREAC and NTF. There is a fan-out near LINAC area #7 where TCLK is converted to LCLK and distributed via the LINAC fiber system (Bob Florian, Mike Kucera). The connection is via the rack #13 TEP using RG-213.
The SY-MAC2 bin (slot 8) formerly sourced TCLK to the NTF and PREAC. Fan-out was at the NTF racks in the lower LINAC gallery beneath area 5. There is one unused RG-213 between the rack #13 TEP and the NTF racks. There are two unused RG-213 between the NTF racks and the PREAC racks. There is one unused RG-213 between the MCR rack MCRR30 TEP and the NTF racks.
The SY-MAC2 bin supports PIOX, PIOR and BTR for SWYD crate $04 and TCLK for the C178 in slot 21. The C178 supports only local users via the I/O panel; TCLK for the FMI fiber system is separately provided direct from the C176 in SWYD crate $06 slot 21 channel #4.
The MAC West patch system is housed in the enclosure attached to the rack at the extreme West end of the MAC Room. It also includes patch panels located inside this rack. These patch panels are shared with other non-link cables.
There are ten 75 ohm cables connecting with a rack and bin at the 2 ND floor of the Linac Annex. KCM-Z082 is a unused spare. KCM-Z083 through KCM-Z089 support (RF) TCLK, MDAT (G), PIOX, PIOR, BTR, MIBS (or) RRBS and TVBS respectively. These connect using RG-59 with the SY-MAC1 bin via the rack #17 TEP. KCM-Z080 (BSTR CLK) is no longer used. It is patched to a RG-213 that connects with the MCR near the MCR NE patch. KCM-Z081 (MRPSL) is no longer used. It is patched to a RG-213 that connects with a bin in MCRR30.
The remaining two RG-213’s connecting with the MCR near the MCR NE patch are connected to two RG-213’s formerly used to support a console in the BSTR West gallery. These connect with a core box on the top of rack G23-RR2-3 and then extend using two RG-213’s to the TEP of a rack in room BGW-112.
There are cables formerly used for the original Electron Cooling Ring connected between MAC West patch and the cable tray above the aisle near area 01 in the BSTR West gallery. There is a bundle of seven 3/8-inch Heliax’. Also, two RG-213’s (KCD-Z002 and KCD-Z003) and six 75-ohm cables (KCG-Z186 through KCG-Z191).
There are four 75-ohm cables that connect between the MAC West patch and the NTF racks in the lower LINAC gallery beneath area 5.
The MAC East patch system is housed in the enclosure attached to the wall at the extreme East end of the MAC Room. These patch panels are shared with other non-link cables.
(Refer to appendix B). Only PIOX, PIOR, BTR and TCLK are supported by the BSTR serial links. Except as follows the links are RF and all cabling is individual strands of 3/8 inch Heliax’ routed via cable tray between relay rack top-entry-panels (TEP’s). There are no unused cables except between AP4 and CUB. The links between the CPU in the Comp. Room and MCR are DC via a shared RG-58 cable bundle. The Comp. Room end is terminates at a cross-connect chassis that contains tape-wound cores. The link between MCR and LG1 (where LINAC meets Booster in the West-Gallery) routes via a shared patch panel in the Northeast corner of MCR, the lower Cross-Gallery and the lower LINAC-Gallery. The connections between MCRR30 and the patch panel are RG-58. The DC link between AP4 and CUB uses part of a seven strand 3/8 inch Heliax’ bundle that is routed via utility tunnel. The link between GMPS and LLRF is via duct bank under the Cross-Gallery access road. There is one RF branch point at LG1. The bin in MCR is shared with other links. TCLK is sourced from MCRR30. The Booster Beam Permit is not part of the link repeater system.
MIBS is routed from MCR to the Booster LLRF via the CUB utility tunnel and the Booster beam enclosure. It is extended from LLRF to EXT via cable tray. MDAT (G) is tapped from the SWYD system at TG-1 and routed via cable tray to EXT and extended to LLRF. As of 11/9/99 MIBS and MDAT are not used at LLRF or EXT.
Note: There is no fiber optic system in the Booster that is appropriate for timing links.
(Refer to appendix C). PIOX, PIOR, BTR and TCLK are supported at all PBAR locations. MIBS is supported at all locations except 30-2, 50-2 and 10-P. MDAT(G) is supported only at 10-3, 50-3 and 30-3. These are all serial links. The PBAR Beam Permit loop is available at all locations but does not use repeaters. Except as follows the links are RF and all cabling is routed via cable tray between relay rack top-entry-panels (TEP’s). All inter-building cabling is 1/2 inch Welflex. All intra-building is cabling is 3/8 inch Heliax’.
1/2 inch Welflex formerly used to support consoles exist: Four connecting MCR with 10-P, two connecting MCR with a patch in the beam enclosure beneath 30-3, two connecting the patch with rack B14R04 at AP-10 and two connecting the patch with TB1. The Network group is now using some of these cables. One 1/2 inch Welflex formerly used to support PIORB connects between MCR and 10-3, between 10-3 and 50-3 and between 50-3 and 30-3. (The parallel cable formerly supporting PIOXB is now used for MDAT). One spare 3/8 inch Heliax’ exist between all intra-building locations. One unused 1/2 inch Welflex connecting F23 with the MI-60 Control Room is reserved for possible Beam Permit loop configurations. Note: Three 1/2 inch Welflex reserved for the LLRF needs connect PBAR with the MI-60 Control Room via F23.
The links between the CPU in the Comp. Room and MCR are DC via a shared RG-58 cable bundle. The Comp. Room end is terminates at a cross-connect chassis that contains tape-wound cores. The link between MCR and 10-P routes via a shared patch panel in the Northeast corner of MCR, the CUB utility tunnel, duct bank to the P-Bar beam enclosure between AP-30 and AP-10 and via the beam enclosure to the penetrations with the Control Room at AP-10. The connection between MCRR30 and the patch panel is RG-58. The connections between AP-10, AP-30, AP-50, AP-0, F27, F23, F0S and MI-60 are all via penetrations and the beam enclosures. The cables connecting F23 with the MI-60 Control Room route via cable tray through the FMI High Level RF Equipment-Gallery in MI-60.
The bin in MCR is shared with other links. MIBS is sourced at F0S. There are RF branch points at 10-2 and TB2 (North end of AP-0). The beam permit status is tapped at F23 using a CAMAC kluge module and routed to the MI-60 Control Room.
There is one pair of 1/2-inch Welflex (also labeled EC74 and EC75) connecting this tunnel patch with the TEP of a rack at the Southwest end of AP-0 (TB-1). These were formerly intended for console #3 but are now used by the Network Ethernet.
Note: There is no fiber optic system in the PBAR that is appropriate for timing links.
(Refer to appendix D) Normally all inter-building connections are RF and route via a nineteen-conductor 3/8 inch Heliax’ cable (19c). This cable is direct buried along the outside periphery of the road and usually about 20 inches deep. All buildings have special heavy-duty patch panels (19c patch) mounted to the ceiling above the roll-up door to terminate (type “N”) the 19c inter-building cable and/or interface to the intra-building cables. Normally all intra-building 1/4 inch Heliax’ In all locations there are non-repeater link users of the 19c cables and 19c patch. In many locations there exist unused 1/4 inch Heliax’ cables between the 19c patch and the repeater bins. Cable lengths are customized to fit each location.
MCR is a RF branch point for PIOX, PIOR, BTR, TCLK and MDAT (G) serial links connecting all locations in ABC sectors and separately all locations in FED sectors. F0S is the source for MIBS and TVBS serial links connecting Downstream to all TEV locations. F0S is the source for the APTVBS serial link connecting Upstream with only F0S, E4, E1, E0, D2, D0, C2, C0, B2, B0, A2, A0 (TG-5), MCR, F4 and F2. After circumventing the entire ring all three BSCLK’s are received at F0S and available for diagnostic purposes. Note: All Three BSCLK’s are generated at the MI-60 Control Room and connect with F0S via the fiber repeater system.
Following is a detailed description of the TEV link repeater system beginning at MCR, proceeding Downstream around the ring and returning to MCR. Only non-standard locations that deviate from the above are specifically described. To aid indexing the physical locations are printed in bold.
The MCR connects with a 19c patch located in the utility tunnel (low level radioactive storage area) near and East of the MAC Room (MCR 19c patch). The 19c routes Downstream via utility tunnel to a 19c patch mounted near the ceiling at TG-5 (A0-1). The TEV link continues Downstream using nineteen individual 3/8 inch Heliax’ via tray in the Transfer-Gallery to a non-standard 19c patch mounted near the ceiling in the tool cage near TG-7. This section of the TEV link cabling and patches is easily confused with similar cabling used as part of the SWYD and FMI link repeater systems. These other systems share the patch at A0-1 and use a 19c cable installed via utility tunnel to connect with an old 19c patch mounted on the ceiling near the magnet cage at TG-7. The TEV 19c non-standard patch at TG-7 connects with A1 via tray through the A0 Kicker Building and then via direct burial, including under the A0 north parking lot. The 19c cables number 13 and 14 were damaged and repaired at a point 36 feet Downstream of the TG-7 patch in the A0 kicker Building Access Corridor. Some obsolete cabling used for the Main Ring beam intensity monitoring system is still connected at the TG-7 patch spigot #12. The bin at A0-1 has an additional module in slot #9 needed to support the TEV Abort system source point.
At A1 the 19c cables for #1 Up and #2 Up are reversed on the 19c patch.
At A2 the module in bin slot 11 is used to locally sum frames sourced from TECAR. A separate 1/2-inch Welflex cable connects this MDAT (L) with MCR. The cable routes Upstream from A2 via the road duct bank to the A0 MVA building. It is spliced in the tray at A0 and continues via tray through the A0 Access Corridor and Cross-Gallery utility tunnel to the patch panel in the Northeast corner of MCR. Connection from the patch panel to MCRR30 is with RG-58. The former MR beam intensity MDAT(L) connection that used 19c cable #9 from A1 to A2 repeater has been removed.
There is an above ground repair splice enclosure just Upstream of A3.
A3 has a separate bin and modules for a branch connecting with CHL. There is a mating bin and modules in the CHL Control Room. PIOX, PIOR, BTR and TCLK are supported. This link formerly included MDAT(G) and Console support. There are two seven conductor 3/8 inch Heliax’ cable bundles routed in parallel connecting A3 with CHL. These terminate at a patch panel mounted on the tray above the door to the electronics room at A3 and they terminate at a patch panel in the Men’s bathroom on the first floor of the CHL building. The cables route via duct between A3 and the A3 Satellite Refrigerator Building and after passing through this building are direct buried along the outside circumference of the berm to the utility underpass of the road near CHL. The Heliax’ cable carrying the link signals (link cable) has an above ground repair splice enclosure directly behind the A3 Satellite Refrigerator Building. Inside A3 the link cable uses RG-58. Inside CHL the link cable is extended with RG-213 to the CHL Control Room on the second floor. Network Ethernet uses one strand of the link cable. The second Heliax’ cable has tank farm and CATV signals.
At B0 the 19c patch is mounted from the ceiling in the Compressor Room (ODH area). The 19c patch is upside down. There are unused 1/4 inch Heliax’ that formerly supported consoles and the old QXR system. There are two interwired bins in rack B006. Both are used for intra-building support. The bottom bin additionally is part of a RF branch connecting with a mating bin at the CDF second floor Control Room. The repeater is connected with RG-58 to a patch panel mounted on the tray above B006. The (CDF) inter-repeater link supporting PIOX, PIOR, BTR, MDAT(G), TCLK, TVBS and MIBS uses seven of the ten RG-213 cables connecting this patch with the CDF second floor Control Room. The remaining three RG-213 cables are used for the SVX detector status routed to the TEV Abort, the CDF System Trip TCLK $D7 request routed to the fiber repeater system and the Network Ethernet. There are two unused RG-8 cables connecting B006 with the CDF second floor Control room and eight unused RG-213 cables connecting B004/B005 with the CDF first floor Counting Room.
Note: There is no fiber optic system between B0 and CDF that is appropriate for timing links.
At the B0 CDF building the cabling and repeater system have been repeatedly reconfigured. A CAMAC system and console formerly located on the first floor in the cryogenics area was supported by the second floor copper repeater using RG-58 cabling. There was a multiple crate non-ACNET CAMAC system connected in a star configuration with the first floor Counting Room that was supported by copper but using fiber type repeater bins and modules and a local front end computer system. Much of the cabling for these systems still exist but the status or future plans are unknown as of this writing.
At C0 the 19c patch is mounted on the wall of the Electronics Room access corridor. The bin at C0 has an additional module in slot #9 needed to support the TEV Abort system source point. The former DC branch that supported the experiment portacamp has been removed. Any links to support the new C0 experimental hall have not been designed.
At D0 the 19c patch is mounted from the ceiling in the Compressor Room (ODH area). There are unused 1/4 inch Heliax’ cables. The bin provides intra-building support and in addition is a DC branch point for supporting the D0 CDF first floor Control Room. Connection with CDF is via ten conductors of RG-213 that are terminated on a patch panel mounted to the tray above rack D006. The repeater is connected with RG-58 to the patch. PIOX, PIOR, BTR, TCLK, MIBS and TVBS are connected. MDAT(G) and APTVBS are available but not connected. The fiber repeater system provides a more jitter free and stable source of TVBS. A separate copper repeater bin in rack D001 is used to interface the fiber system and provide TVBS-F (DC) and TVBS-F (RF) that are connected to the patch. The remaining two RG-213 cables are not used. There were formerly connections from the D0 CDF first floor Control Room with the E0 portacamp experiment (Norm Amos) that used the RG-213 and 19c cables #16 and #17. 19c #2 is used to connect TCLK from C4 to a module in bin slot #9 so that a diagnostics spy system can use TCLK from both the ABC and FED serial link branches.
Note: There is no fiber optic system between B0 and CDF that is appropriate for timing links.
At E0 the 19c patch is mounted from the ceiling in the Compressor Room (ODH area). There are unused 1/4 inch Heliax’ cables. The bin provides intra-building support and in addition was formerly a DC branch point for supporting the E0 portacamp experiment (E811, Fermilab-Cornell) via eight RG-213.
There is a below ground repair splice just Upstream of E3.
F0S has a separate bin and modules for a branch connecting with E4R. There is a mating bin and modules in the E4R building. Between F0S and E4 four 19c strands support PIOX, PIOR, BTR and TCLK. Between E4 and E4R these signals use four of the six RG-213 cables. One other RG-213 is reserved for a cryogenics connection. The Network Ethernet uses the remaining RG-213.
For about 150 feet Upstream from the South end of the F0 building the 19c is protected by 5-inch PVC pipe (not concrete encased). There is a repair junction box buried under the Cryogenic piping where it penetrates the retaining wall. TDR indicates minimal damage to some 19c cables just where they penetrate the wall and enter the duct at the South end of the F0 Compressor Room. The 19c cable routes via duct under the Compressor Room and via trench through the remainder of the F0 building. The trench is accessible only between the Tevatron Control Room (F0S) and the F0 LCW Room (F0N). For about 150 feet Downstream from the North end of the F0 building the 19c is protected by 5-inch PVC pipe (not concrete encased but in close proximity to the Tevatron inter-building duct bank which is concrete encased). Note: The cables and ducts are buried less then one-foot below grade. There is an above ground repair junction box where the PVC protection pipe ends. There are 19c patch panels mounted on the wall at F0S and F0N. No intra-building connections are needed at F0N.
There is an above ground repair splice enclosure just Upstream of F2.
The 19c is direct buried from F4 Downstream under the South A0 parking lot and across the berm where it penetrates the Transfer-Gallery exterior wall near TG-3. There is a tray mounted repair splice in lab TGS-120 about 50 feet Downstream of the wall penetration. The TEV link continues Downstream via the Transfer-Gallery trays and the Cross-Gallery utility tunnel and connects at the MCR 19c patch.
Appendix A: Definition of Acronyms and Terms
“Bridges Box”: Custom 1U chassis’s used for fan-out of TCLK and MDAT (G). The replacement for new installations is the “McClure Box”.
BTR: Block Transfer Return. Separate for each link. 10 Mbit serial CAMAC burst mode data received by the CPU from a target crate and slot(s) in response to a special PIOX command. Up to 65,535 data frames. Asynchronous PIOX/PIOR is allowed while BTR is in progress. Also refers to the BTR receiver section of each CPU.
Burst Mode: The signal is interrupted for variable time periods. While inactive there are no transitions and the signal is nominally zero volts. See also CW.
CAMAC: Computer Automated Measurement And Control. A defined worldwide standard for card cages (crate), modules and power supplies. Fermilab systems adhere to this standard. The link repeater systems are proprietary.
CDF: Colliding Detector Facility. Refers to the Control Rooms at the B0 and D0 detector buildings.
CPU: Central Processing Unit. Separate front-end computer for each CAMAC link. Includes the Serial Link Controller (SLC) and Block Transfer Receiver (BTR). Located in the Comp. Room.
CW: Continuous Wave. The signal is a continuous series of 1’s and 0’s. See also Burst Mode.
DC: Commonly used slang referring to the TTL level intra-building signals.
MCR NE patch: Two custom patch panels mounted vertically on the wall in the extreme Northeast corner of the MCR.
MDAT (G): Machine DATa Global. 10 Mbit serial burst mode data distributed from the sum junction in the MCR to all locations in all machines except BSTR. Includes all type codes.
MDAT (L): Machine DATa Local. Separate 10 Mbit serial burst mode data links from selected remote sources transmitted toward the sum junction in the MCR.
ODH: Oxygen Deficiency Hazard area. Specific safety training is required for entry.
PIOR: Programmed Input Output Receive. Separate for each link. 10 Mbit serial CAMAC burst mode data received by the CPU from the target CAMAC crate and slot. Response to a PIOX.
PIOX: Programmed Input Output Transmit. Separate for each link. 10 Mbit serial CAMAC burst mode data transmitted from the CPU to a target CAMAC crate and slot. The CPU must wait for the corresponding PIOR.
Repeater Central: Commonly used slang referring to the link repeaters located in rack MCRR30 in MCR. This is the central cross-connect point for all the Copper Repeater Systems.
RF: Commonly used slang referring to the 50 MHz modulated inter-building signals.
RR: Recycler Ring. The Recycler Ring accelerator, particularly the Recycler Ring link repeater system.
SLC: Serial Link Controller. The section of each CPU that interfaces to the associated link repeater system.
TDR: Time Domain Reflectometry
TEP: Top Entry Panel of a relay rack
19c: Commonly used slang referring to the nineteen conductor Heliax’ cable bundle installed around The TEV.