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 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

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