Difference between revisions of "04-20-2015"
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[[File:r4538_PMT4_TDCmultihits.png | 200 px]] | [[File:r4538_PMT4_TDCmultihits.png | 200 px]] | ||
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| + | Now change threshold to 16 mv | ||
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| + | Run 4539 | ||
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| + | [[File:r4539_PMT4_TDCmultihits.png | 200 px]] | ||
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[[2nCor_44#Run_Plan]] | [[2nCor_44#Run_Plan]] | ||
Revision as of 18:04, 20 April 2015
Started testing detector 4 again.
Fake stop time
Discriminator width was decreased from 40 ns (255 on discriminator display) to 6.3 ns (10 on discriminator display)
Discriminator threshold is set to 100 mv
The delay for the fake stop is set to 800 ns
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 4536
Below is a picture of the typical 800 ns fake stop pulse that should appear as a second hit in the Multihit TDC.
Now decrease delay of fake stop to 400 ns
Terminator test
Change discriminator threshold with terminators in
PMT detector #4 HV at -1000 Volts
Run 4537 had a discriminator threshold set to 100 mv and the terminators were in. I see
Now change threshold to 30 mv
Run 4538
I see two pulses from the discriminator but only one from the delayed fake stop (perhaps our delay module Ortec 416A is ignoring the second pulse)
Now change threshold to 16 mv
Run 4539
