SPEAR EPICS
Timing Delay and Amplitude Setpoints
The SPEAR timing system uses
SRS DG535
delay generators to set delay and trigger parameters using
GPIB control.
The timing system electrical interlock diagrams are a good reference (
Booster,
LINAC,
Booster BPM,
Booster 358MHz between B117 and B149) and also the
power supply system manager timing page.
Area Hazard Analysis documents are available for each building with
timing hardware. The following tables show
the current configuration of all delay generators. NOTE: After changing
setpoints, users should save settings in saveset location 9. Quick links:
SPEAR Kickers K1 and K2 (118-DG1)
Name |
Delay (nsec) |
Thresh/Ampl (V) |
Offset (V) |
Term/Load Imped |
Mode |
Slope/Polarity |
Trigger |
Trig in |
- |
1.50 |
- |
50 ohm |
EXT |
rising |
Boo Extraction Trig** |
T0 out |
- |
- |
- |
50 ohm |
TTL |
norm |
118-DG2 Trig |
A out |
T+49.29* |
- |
- |
- |
- |
norm |
K1 Delay |
B out |
A+791.24* |
- |
- |
- |
- |
norm |
K1 Pulse Width |
AB out |
- |
- |
- |
50 ohm |
TTL |
- |
K1 Trig |
C out |
T+117.01* |
- |
- |
- |
- |
norm |
K2 Delay |
D out |
C+664.05* |
- |
- |
- |
- |
norm |
K2 Pulse Width |
CD out |
- |
- |
- |
50 ohm |
TTL |
- |
K2 Trig |
* Timing values are often tuned and are not kept up-to-date on this web page.
Values are kept in matlab configuration files.
** The trigger in the booster that drives its extraction kicker is, of
course, synchronized with both the ejected bucket in the
booster and the injected bucket in SPEAR. This synchronization is done in
a timing module in the booster. This signal then is buffered to the booster
extraction kicker and other diagnostics (BTS-DG1 and BTS-DG2) and into SPEAR
to drive a number of synchronization signals.
This signal is further buffered for distribution around SPEAR. The most
important of these buffered signals drives the SPEAR injection kickers
(118-DG1 and 118-DG2). Other SRSs (117-DG1 and 117-DG2) are
dedicated for diagnostics that are also synchronized to injection.
SPEAR Kicker K3 (118-DG2)
Name |
Delay (nsec) |
Thresh/Ampl (V) |
Offset (V) |
Term/Load Imped |
Mode |
Slope/Polarity |
Trigger |
Trig in |
- |
1.00 |
- |
50 ohm |
EXT |
rising |
118-DG1 Chan T0 |
T0 out |
- |
- |
- |
50 ohm |
TTL |
norm |
SPR-TR1 Digitizer |
A out |
T+92.50* |
- |
- |
- |
- |
norm |
K3 Delay |
B out |
A+759.40* |
- |
- |
- |
- |
norm |
K3 Pulse Width |
AB out |
- |
- |
- |
50 ohm |
TTL |
- |
K3 Trig |
C out |
- |
- |
- |
- |
- |
- |
not assigned |
D out |
- |
- |
- |
- |
- |
- |
not assigned |
CD out |
- |
- |
- |
- |
- |
- |
not assigned |
* Timing values are often tuned and are not kept up-to-date on this web page.
Values are kept in matlab configuration files.
Bucket Select and BTS Cameras (117-DG1)
Name |
Delay (usec) |
Thresh/Ampl (V) |
Offset (V) |
Term/Load Imped |
Mode |
Slope/Polarity |
Trigger |
Trig in |
- |
-0.50 |
- |
HIGHZ |
EXT |
falling |
Boo Extraction Trig |
T0 out |
- |
- |
- |
50 ohm |
TTL |
norm |
spare |
A out |
T+30000 |
- |
- |
50 ohm |
TTL |
norm |
Bucket Select Delay |
B out |
A+50.00 |
- |
- |
50 ohm |
TTL |
norm |
Bucket Select Pulse Width |
AB out |
- |
- |
- |
50 ohm |
TTL |
- |
Bucket Select |
C out |
T+0.00 |
- |
- |
50 ohm |
TTL |
norm |
BTS Camera Pulse Delay |
D out |
C+10.00 |
- |
- |
50 ohm |
TTL |
norm |
BTS Camera Pulse Width |
CD out |
- |
- |
- |
HIGHZ |
TTL |
- |
BTS Camera Trig |
SPEAR BPM ECDRs, Picoscope, and BTS Toroid 2 (117-DG2)
Name |
Delay (usec) |
Thresh/Ampl (V) |
Offset (V) |
Term/Load Imped |
Mode |
Slope/Polarity |
Trigger |
Trig in |
- |
-0.50 |
- |
50 ohm |
EXT |
falling |
Boo Extraction Trig |
T0 out |
- |
- |
- |
50 ohm |
TTL |
norm |
- |
A out |
T+0.34 |
- |
- |
50 ohm |
TTL |
norm |
10Hz BPM ECDR Delay |
B out |
A+0.50 |
- |
- |
50 ohm |
TTL |
norm |
10Hz BPM ECDR Pulse Width, Picoscope |
AB out |
- |
- |
- |
50 ohm |
TTL |
- |
10Hz BPM ECDR Trigger* |
C out |
T+2.51 |
- |
- |
50 ohm |
TTL |
norm |
BTS Toroid 2 Delay |
D out |
C+0.10 |
- |
- |
50 ohm |
TTL |
norm |
BTS Toroid 2 Pulse Width |
CD out |
- |
- |
- |
50 ohm |
NIM |
- |
B117 BTS Toroid 2 CAEN Module |
* The BPM ECDRs (Echotek Digital Receivers) capture data that
start at injection. Actually, because of various delays in cable lengths of
the signals taking the pulses to the kickers and from the bpms, the ECDRs
trigger one or two turns before the beam arrives, allowing capture of the
injected turn. The ECDRs are currently used only during machine physics for
injection experiments. The timing signal is buffered out by Akre boxes to
B116 and B132 and there they are further buffered to the individual ECDRs.
LINAC RF and Kickers (LIN-DG1)
Name |
Delay (usec) |
Thresh/Ampl (V) |
Offset (V) |
Term/Load Imped |
Mode |
Slope/Polarity |
Trigger |
Trig in |
- |
-0.30 |
- |
HIGHZ |
EXT |
rising |
LINAC Inject Trig |
T0 out |
- |
- |
- |
50 ohm |
TTL |
norm |
RF Diode Calibration |
A out |
T+3.225 |
0.40 |
0.00 |
50 ohm |
VAR |
norm |
S Band Amp (rear) |
B out |
T+9.902* |
2.00 |
0.00 |
50 ohm |
VAR |
norm |
Modulator (rear)
Linac ACM Triggers (front) |
AB out |
- |
- |
- |
50 ohm |
TTL |
- |
- |
C out |
T+12.437 |
0.50 |
0.00 |
50 ohm |
VAR |
- |
Inj Kicker 1 (rear) |
D out |
T+12.345 |
0.50 |
0.00 |
50 ohm |
VAR |
- |
Inj Kicker 2 (rear) |
CD out |
- |
- |
- |
50 ohm |
TTL |
- |
- |
* This timing value is often tuned and is not kept up-to-date on this web page.
The Linac BCS chassis will disable the modulator and/or amplitifier
trigger on fault. See the
BCS chassis schematic for more detail.
LTB Toroid and LINAC Cameras (LIN-DG2)
Name |
Delay (usec) |
Thresh/Ampl (V) |
Offset (V) |
Term/Load Imped |
Mode |
Slope/Polarity |
Trigger |
Trig in |
- |
-0.30 |
- |
HIGHZ |
EXT |
rising |
LINAC Inject Trig |
T0 out |
- |
- |
- |
50 ohm |
TTL |
norm |
Photo Cathode Test |
A out |
T+13.65 |
- |
- |
50 ohm |
TTL |
norm |
LTB Toroid 1 Delay |
B out |
A+0.10 |
- |
- |
50 ohm |
TTL |
norm |
LTB Toroid 1 Pulse Width |
AB out |
- |
- |
- |
50 ohm |
NIM |
- |
B140 LTB Toroid 1 CAEN Module |
C out |
T+0.0 |
- |
- |
50 ohm |
TTL |
norm |
Linac Camera Delay |
D out |
C+10.0 |
- |
- |
50 ohm |
TTL |
norm |
Linac Camera Pulse Width |
CD out |
- |
- |
- |
HIGHZ |
TTL |
- |
Linac Cameras |
LINAC Chopper and Rate (LIN-DG3)
Name |
Delay (usec) |
Thresh/Ampl (V) |
Offset (V) |
Term/Load Imped |
Mode |
Slope/Polarity |
Trigger |
Trig in |
- |
-0.30 |
- |
50 ohm |
** |
rising |
LINAC Inject Trig |
T0 out |
- |
- |
- |
50 ohm |
TTL |
norm |
- |
A out |
T+13.303 |
3.00 |
0.00 |
50 ohm |
VAR |
- |
Chopper Trigger (rear)
ALARA Chopper Interlock Chassis |
B out |
T+delay* |
- |
- |
50 ohm |
TTL |
norm |
Rate |
AB out |
- |
- |
- |
50 ohm |
TTL |
- |
- |
C out |
T+7.685 |
- |
- |
50 ohm |
TTL |
norm |
- |
D out |
T+50000 |
- |
- |
50 ohm |
TTL |
invert |
BTS/LTB BPM ADC |
CD out |
- |
- |
- |
50 ohm |
TTL |
- |
- |
* delay derived from user-specified rate (1,2,5,10 hz)
** This delay generator has a trigger inhibit line which is controlled by a
digital output in the nearby VME transport line BPM crate (140-VME4 in rack 106). The chopper is turned on and off using the inhibit line.
LTB BPMs and LINAC Pulse Signal Monitor (LIN-DG4)
Name |
Delay (usec) |
Thresh/Ampl (V) |
Offset (V) |
Term/Load Imped |
Mode |
Slope/Polarity |
Trigger |
Trig in |
- |
-0.30 |
- |
HIGHZ |
EXT |
rising |
LINAC Inject Trig |
T0 out |
- |
- |
- |
50 ohm |
TTL |
norm |
RF Diode Calibration |
A out |
T+7.818 |
- |
- |
50 ohm |
TTL |
norm |
LIN-TR1,2,3,5,7 Digitizers |
B out |
T+9.818 |
- |
- |
50 ohm |
TTL |
norm |
- |
AB out |
- |
- |
- |
50 ohm |
TTL |
- |
RF Diode Calibration |
C out |
T+13.453 |
- |
- |
50 ohm |
TTL |
norm |
LTB BPM X/Y |
D out |
T+12.818 |
- |
- |
50 ohm |
TTL |
norm |
LTB BPM Sum (BPM-TR1 Digitizer) |
CD out |
- |
- |
- |
50 ohm |
TTL |
- |
- |
BTS BPMs and BTS Toroid 1 (BTS-DG1)
Name |
Delay (usec) |
Thresh/Ampl (V) |
Offset (V) |
Term/Load Imped |
Mode |
Slope/Polarity |
Trigger |
Trig in |
- |
-0.35 |
- |
50 ohm |
EXT |
rising |
Booster RF Sync Module |
T0 out |
- |
- |
- |
50 ohm |
TTL |
norm |
- |
A out |
T+2.00 |
- |
- |
50 ohm |
TTL |
norm |
BTS Toroid 1 Delay |
B out |
A+0.10 |
- |
- |
50 ohm |
TTL |
norm |
BTS Toroid 1 Pulse Width |
AB out |
- |
- |
- |
50 ohm |
NIM |
- |
B140 BTS Toroid 1 CAEN Module |
C out |
T+2.712 |
- |
- |
50 ohm |
TTL |
norm |
BTS BPM X/Y |
D out |
T+0.892 |
- |
- |
50 ohm |
TTL |
norm |
BTS BPM Sum (BPM-TR2 Digitizer) |
CD out |
- |
- |
- |
50 ohm |
TTL |
- |
- |
Booster Kickers, BTS ACMs, BTS SIS, BTS PSM (BTS-DG2)
Name |
Delay (usec) |
Thresh/Ampl (V) |
Offset (V) |
Term/Load Imped |
Mode |
Slope/Polarity |
Trigger |
Trig in |
- |
-0.35 |
- |
HIGHZ |
EXT |
rising |
Booster RF Sync Module |
T0 out |
- |
- |
- |
50 ohm |
TTL |
norm |
PSM Scope |
A out |
T+1.672 |
2.0 |
0.0 |
50 ohm |
VAR |
norm |
Extraction Kicker 1 |
B out |
A-0.08 |
2.0 |
0.0 |
50 ohm |
VAR |
norm |
Extraction Kicker 2, BTS ACMs |
AB out |
- |
- |
- |
50 ohm |
TTL |
- |
- |
C out |
T+2.70 |
- |
- |
50 ohm |
TTL |
norm |
BTS BPM SIS8300 |
D out |
T+1.25 |
- |
- |
50 ohm |
TTL |
norm |
LIN-TR6 Digitizer |
CD out |
- |
- |
- |
50 ohm |
TTL |
- |
- |
Booster (BOO-DG1)
Name |
Delay (usec) |
Thresh/Ampl (V) |
Offset (V) |
Term/Load Imped |
Mode |
Slope/Polarity |
Trigger |
Trig in |
- |
-0.3 |
- |
50 ohm |
EXT |
falling |
Booster RF Sync Module |
T0 out |
- |
- |
- |
50 ohm |
TTL |
norm |
SLM |
A out |
C+91740 |
- |
- |
HIGHZ |
TTL |
norm |
Extraction Septum |
B out |
A+1000 |
- |
- |
50 ohm |
TTL |
norm |
Diag Pulse Width |
AB out |
- |
- |
- |
50 phm |
TTL |
- |
Diagnostics |
C out |
T+319.098 |
-1.6 |
0.0 |
50 ohm |
VAR |
norm |
SPEAR Injection, Boo Cams |
D out |
C-10 |
- |
- |
HIGHZ |
TTL |
norm |
Booster Camera Pulse Width |
CD out |
- |
2.65 |
-1.50 |
HIGHZ |
TTL |
- |
Booster Cameras |
SPEAR EPICS |
SPEAR Home |
SSRL Home |
SLAC Home
Contact: Stephanie Allison
Last Modified: Apr 20, 2016