Revision as of 17:34, 20 April 2015

Started testing detector 4 again.

Fake stop time

Discriminator width was decreased from 40 ns to

Discrimniator threshold is set to 100 mv

The delay for the fake stop is set to 800 ns

Below is a picture of the typical 400 ns fake stop pulse that should appear as a second hit in the Multihit TDC.

CODA/CODAreader/ROOT_V5.30/R1DC/evio2nt -fr4516.dat > /dev/null

R1DC->Draw("(evt.TDC1190[1][6]-evt.TDC1190[2][6])/10>>(4096,-4096,4096)");

Run 4534

Now increase delay of fake stop to 800 ns

Terminators in

Discriminator at 20 mv

PMT detector #4 HV at -1000 Volts

@@ Line 2: / Line 2: @@
 =Fake stop time=
+Discriminator width was decreased from 40 ns to
+Discrimniator threshold is set to 100 mv
+The delay for the fake stop is set to 800 ns
-Found some double pulsing out of the discriminator that was 100 ns later in time causing a second peak other than the expected one at 400 ns.
-Below is a picture of a double pulse
 [[File:FakeStop_4-20-2015_A.png| 200 px]]