HAND Access Activities, HV Changed

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User name ellie

Log entry time 15:35:30 on May 28, 2009

Entry number 277119

keyword=HAND Access Activities, HV Changed

I went into the Hall with Doug to see if we could figure out what was wrong with V-22L, N3-11L, N3-12L, N3-11R, and N3-12R.

V-22L :
· Looked at signal on o-scope
     → Looked good if a little slower rate compared to the other signals
· Unplugged signal cable from Amplifier and put V-23L in its place
     → V-23L looked good
     → Put V-23L back where it belongs
· Checked V-22L's amplifier channel with a pulser
     → Pulsed signal coming out of amplifier looks good
· Determined that the amplifier was not the problem
     → Put V-22L signal back into amplifier
· Increased V-22L HV to 1250 V
     → This increased the rates similar to other bars, we'll see if it helps

Plane 3 :
· All of the problematic bars in Plane 3 were after pulsing
· The voltages of each were lowered by 150 V so that the after pulses would be below the threshold (-50mV)
     → N3-11L is now at -1600 V (was -1750 V)
     → N3-12L is now at -1555 V (was -1705 V)
     → N3-11R is now at -1665 V (was -1850 V)
     → N3-12R is now at -1600 V (was -1750 V)