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 | |
| Channel | Desc |
| 0 | Metalica wire 1 |
| 1 | Plastica wire 1 |
| 14 | Front Scint |
| 15 | Back Scint |
| 16 | Veto Scint |
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