CAMAC C500 - LBOE MODULE

10-Aug-2000

Table of Contents

Description

Because of certain unique functions sometimes required to produce Tevatron Clock events, numerous special-purpose circuits are necessary. Most of these circuits are small and occupy very little space on a CAMAC card. Installation of a new CAMAC card for each additional circuit would use a prohibitive amount of precious crate space in the MAC room. This problem has been solved (??) by the creation of a multi-purpose module called the LBOE (Little-Bit-Of-Everything.) In it's present state of evolution the LBOE module performs seven different functions resulting in seven (7) different Tevatron Clock Events.
1. $0E-FIRST BOOSTER BEAM CYCLE AFTER PREPULSE CYCLE
The $0E event generator utilizes a latch which is set by event $12. The latch remains set until event $10 is detected. Event $10 allows the $0E request to be gated out of the LBOE. When $0E appears on the clock, the latch is cleared and waits to be set again by another $12.
2. $1E-8GeV BEAM EXTRACTION SYNC FOR PREPULSE CYCLE
The $1E latch is set by event $12 and gated out of the LBOE by Booster Extraction Sync. The latch is either self-clearing with $1E or can be reset by events $11, $13, $14, $15, $16, $17, $19, $1C or $1D.
3. $1F- 8 GeV BEAM EXTRACTION SYNC FOR BEAM CYCLE
The $1F latch is set by $13, $14, $15, $16, $17, $19, $1C or $1D and gated out of the LBOE with Booster Extraction Sync. The latch is either self clearing with $1F or can be reset by $11 or $12.
4. $28-MAIN RING INJECTED BEAM SYNC
This event is generated by $13, $14, $15, $16, $19, $1C, $1D, $1F and $55 in the following manner. A latch is set by $13, $14, $15, $16, $19, or $1C and cleared by $11, $12, $17, or $1D. When the latch is set it waits for event $1F to occur. A $28 request will be issued for each $1F that occurs after any of the "SET' events but before any of the "CLEAR" events.
5. $4E-TEVATRON QUENCH
The input to the quench receiver circuit comes from the quench detector located in service building A2. When the quench signal is received the LBOE sends a request for event $4E to be put on the clock. To insure noise immunity and prevent spurious triggers, the quench receiver requires that the input be present for 1 millisecond before the event request is issued.
6. $5E-TEVATRON LOW BETA QUENCH
The input to the Low Beta Quench circuit is provided by a translator module which converts the incoming Fiber-Optic signal to a normally high TTL signal. When a quench occurs and the signal goes low, the LBOE detects the transition and waits for 1 millisecond. At the end of the 1 millisecond wait, an event request pulse is issued. If the quench signal is still at a TTL low, the event request pulse will be gated to the HCRM.
7. $79-MAIN REING BPM PREPARE FOR BEAM
Requests for this event are issued by CAMAC 377 timers, but controlled by the LBOE. An external permit from the Beam Switch Sum Box must be present before the LBOE will allow the event request to be issued to the CAMAC 175 module. Jumpers are available which allow forced assertion of the permit, excluding those set via CAMAC commands. The $79 request was formerly controlled by a separate CAMAC module known as the "Programmable And."
LBOE CAMAC COMMANDS
FunctionDescription
F(0) A(0) Read event $79 permit status
F(0) A(1) Read event $71 permit status *
F(1) A(0) Read counter value for time plot timestamp reset ($02) *
F(1) A(1) Read counter value for Super Cycle Sample Time ($01) *
F(6) A(0) Read module identification number: 500(DEC) 1F4(HEX)
F(9) A(0) Clear event $71 and $79 CAMAC permit
F(24) A(0) Clear CAMAC permit event $79 only
F(24) A(1) Clear CAMAC permit event $71 only *
F(26) A(0) Set CAMAC permit event $79 only
F(26) A(1) Set CAMAC permit event $71 only *
* Obsolete functions

F(0)A(0) Data Format
R3R2R1
Permit2Permit1F26A0 Permit

LBOE I/O ASSIGNMENTS
PINLR
1TRG7979REQ
2TRG71(*)71REQ(*)
371PMT(*)4EREQ
479PMT2(*)5EREQ
579PMT128REQ
6TEVQ39REQ(*)
7LBQ8BREQ(*)
802REQ(*)1FREQ
901REQ(*)1EREQ
10TTL1(*)1DREQ(0EREQ)
11TTL2(*)1AREQ(*)
12TTL3(*)1BREQ(*)
13Spare I/OSpare I/O
14Spare I/OSpare I/O
15Spare I/OSpare I/O
16BESGND
17TLG(*)GND
18TCLKGND
* NO LONGER USED


$0E = $10 * $0Eflag : $0Eflag = S($12) R($0E)
$1E = BES * $1Eflag : $1Eflag = S($12) R($11 + $13 + $14 + $15 + $16 + $17 + $19 + $1C + $1E + $1D)
$1F = BES * $1Fflag : $1Fflag = S($13 + $14 + $15 + $16 + $17 + $19 + $1C +$1D) R($11 + $12 +$1F)
$28 = $1F * $28flag : $28flag = S($13 + $14 + $15 + $16 + $19 + $1C) R($11 + $12 + $17 + $1D)
$4E = TEVQ > 1MS
$5E = LBQ > 1MS
$79 = TRG79 * (79PMT1 * 79PMT2) + F26A0)

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