IAC 1-8-08

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Revision as of 20:28, 8 January 2008 by Oborn (talk | contribs) (→‎Run 303)
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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

FastClear IN

Run 303 =

Increase current to 15 Hz

FastClear OUT


Run 303 =

Increase current to 15 Hz

FastClear In

Moved FastClear to 20 us from gate.




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