IAC 1-8-08
Signal Cables
| HV settings | ||
| Cable # | Volts | Desc |
| 223A10 | Metalica Sense Wire #4 | |
| 223A11 | Plsstica Sense Wire #4 | |
| 223A12 | 1105 | PMT Scintillator |
| 223A13 | 1110 | Middle Scintillator |
| 223A14 | 1090 | Last Scintillator (Veto) |
| 223A15 | V260 Scaler Input | |
| 223A16 | V260 Scaler Input | |
Drift Chamber
90/10 ArCo2
Drift Chamber HV
| HV settings | ||
| Cable # | Volts | Current (ma) |
| Sense | 1456 | |
| Field | 729 | |
| Guard | 731 | |
ADC Channel ID
| ADC Channel IDs | ||
| ADC Channel | Desc | Patch Panel Channel |
| 0 | Metalica wire 1 | 1 |
| 1 | Plastica wire 1 | 2 |
| 14 | Front Scint | 15 |
| 15 | Back Scint | 16 |
| 16 | Veto Scint | ribbon cable |
| ADC Peaks (RMS) -- Summary | ||||
| Run | ADC1 | ADC2 | ADC15 | ADC16 |
| 300 | ? | 252 (34 -- dbl pk) | ped | ped |
| 301 | 346 (18) | 290 (17) | ped | ped |
| 302 | 441 (8) + ped | 253(8) + ped | ped | ped |
| 303 | ped | dbl-pk ped ? | ped | ped |
| 304 | broad ped | broad ped | ped | ped |
| 305 | narrow ped | broad ped | ped | ped |
| 306 | few evts at 586 + ped | few evts at 462 + ped | dbl-pk ped | ped |
| 307 | narrow ped | broad ped - 65 | ped | ped |
| 308 | narrow ped | broad ped - 120 | ped | ped |
| 309 - 317 | ped | ped | ped | ped |
| ADC Peaks (RMS) -- Cuts: 200 -500 | ||||
| Run | ADC1 | ADC11 | ADC2 | ADC 12 |
| 318 | 371 (35) | 322 (93)) | 238 (69) | 241 (81) |
| 319 | 371 (35) | 322 (93)) | 238 (69) | 241 (81) |
Run 297:
First measurement with ADCs. Zero position (beam hitting trumpet).
Run 298:
Move Drift chamber 1 cm (-20,000 on axis 2, 0.4 [inches] left arrow on GUI) away from trumpet.
We had no PMT coincidences (OR was on).
This run should be ignored because table position meter ("Axis-3" MC 2000) was on and that caused noise on PMT signals.
Run 298:
Run 300.
gate width: 600ns. PMT gains too low. Timing is around 100 ns out of time. Plastica and Metalica look good.
Run 301
Increase gate width to 1 us. PMTs still in the ADCs, but gains are too low. Longer gate width allows for complete integration of the wirechamber ADCs. Signals are better. Position at 1cm from trumpet of feedthrough. 2376 evts.
Front scint 1160
Middle scint 1100
=Run 302
Front scint 1220, Disc threshold 200 mV (Big paddle)
Middle scint 1175, Disc Threshold 51 mV
rate is around 1 Hz.
Run 303
Increase current to 15 Hz
FastClear IN
Run 304
Increase current to 15 Hz
FastClear OUT
Run 305
Increase current to 15 Hz
FastClear In
Moved FastClear to 20 us from gate.
Run 306
Run 307
Everything ORed. Singles. Something wrong with the ADCs. Swap cables to ADC 7 and 8 (plastica and metalica)
Run 308
Plastica SW3 --> Ch. 7 (ADC6) Metalica SW4 Ch. 6 (ADC5) Plastica SW4 --> Ch. 8 (ADC7)
FastClear OUT.
Run 309
Metalica SW4: Ch. 7 (ADC 6)
Plastica SW4 Ch. 8 (ADC 7)
Has stuff in Chan. 8 and 7. Singles (ORed).
FastClear OUT
Run 310
FastClear IN.
Nothing
Run 311
Swap polarity of FastClear. Singles.
Run 312
FastClear IN. Coincidences.
Stuff in Ch. 9 nothing in Ch. 8. nothing in Ch. 7
Run 313
gate width 600 ns FC in
Run 314
FC out
Run 315
HV: SW: +1500V GW: +750V, FW: -750V
Run 315
HV: SW: +1500V GW: +750V, FW: -750V
HV: SW: +1550V GW: +775V, FW: -775V No change in Ch 9. It does not change anything in the ADC.
HV: SW: +1500V GW: +750V, FW: -750V
Run 317
Not gated right. Wchmbr pulses now in gate.
Run 318
sw 4 + 10mm (319 junk)
Run 320
sw 4 +8mm.
Run 321 junk
Run 322
sw 4 +6mm.
Run 323
sw 4 +4mm.
Run 324
sw 4 +2mm.
Run 326
shift in 1 mm.
sw 4 +3mm.
ZEROED.
Run 327
sw4: 0 mm
Run 328
sw4: +1 mm
Run 329
sw4: +2 mm
Run 330
sw4: +3 mm
Run 331
sw4: +4 mm
Run 332
sw4: +10 mm
Run 333
sw4: +30 mm
Run 334
sw4: +50 mm HV: SW: +1500V GW: +750V, FW: -750V
Achtung: Post experiment stuff
Pulse generator problem. What exactly did we trigger on? Was there a shift in the pulse that was sent to us wrt the gun pulse for generating the ADC (integration) gate? We saw a shifting in the gate. We need to systematically study if there is a shift. Note that things went to hell after run 301. We did not change anything except for the width of the gate from 600 ns to 1000 ns. By increasing the width of the gate we increased the integration time and the ADC peak from PLASTIKA went from two peaks (around channel 200) to a nice gaussianlike peak right at channel 500. [Check this]. At run 301 we had the scintillators in the gate, albeit with rather low gain. We then increased the voltages and adjusted thresholds accordingly. Then mysteriously the scintillators fell outside the gate and we had no ADCs from the scintillators. [Were the operators shifting the beam tune to maximize response from the scintillators?]
The peak then magically came back on run 318 and vanished after run 324. In the best case scenario we have 5 good data points: (1.0, 0.8, 0.6, 0.4, and 0.2 mm).
We know the shift was not due to slop in the translation table. The position at the end of the run 334 was +50 mm. We returned to the zero point shifting the 2-axis by 2.0 units in the GUI (2.0 in).
We need belly buttons, lemo cables, connectors: lemo/BNC. Lots and lots of cables.
We need cleaner and smaller scintillators. Nice undergrad project.