PePPO 03242012

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Oportunistic Beam studies

Trigger Setup

1.) The V895 was double pulsing and its output pulse maxed out at 40 ns



03242012 V895 DoublPuls.png
The V895 "Maj" output is shown on Ch1 along with the NaI signal which was discriminated by it


2.) inserted a gate delay generator to change the V895 output pulse to a microsecond

03242012 V895 LongrPuls.png
I took the "MAJ" output and used a Phillips Gate Generator to extend the pulse length in order to stop multiple triggers

Run list

Run# run mode Run length (sec) Beam Target Trig Logic VME discriminator Threshold (mV) HV1 (setting/V) A1 HV2 (setting/V) A3 PL (setting/ns) PTW (setting/ns)
4073 sample 240 off empty (Det1 OR Det2) 200 2.0/0.888 2.7/1.2
4074 sample off/tuning empty (Det1 AND Det2) 50 2.2/0.888 3.0/1.2
4075 sample off/tuning Chromox (Det1 AND Det2 AND SYNC) 50 2.2/0.888 3.0/1.2
4078 sample e+ (0.3 nA) Chromox (Det1 AND Det2 AND SYNC)** 50 2.2/0.888 3.0/1.2
4079 sample e+ (0.3nA) Chromox (Det1 AND Det2)** 50 2.2/0.888 3.0/1.2
4080 sample e+(1 na) Chromox (Det1 AND Det2 AND SYNC)** 50 2.2/0.888 3.0/1.2
4081 sample 540 sec e+(3 na) Chromox (Det1 AND Det2 AND SYNC)** 50 2.2/0.888 3.0/1.2
4082 sample 23 min e+(0.3 na) Chromox (Det1 AND Det2 AND SYNC)** 50 2.2/0.888 3.0/1.2
4083 sample sec e+(0.3 na) Chromox (Det1 AND Det2) 50 2.2/0.888 3.0/1.2
4084 sample sec e+(0.150 na) Chromox (Det1 AND Det2) 50 2.2/0.888 3.0/1.2 Changed discriminator to 50 mv for both channels it was at 20 the scalers will count differently now but the trigger theshold is still the same 100 mV
4085 sample sec e+(0.15 na) Chromox (Det1 AND Det2 AND SYNC) 50 2.2/0.888 3.0/1.2
4086 sample sec e+(0.05 na) Chromox (Det1 AND Det2) 50 2.2/0.888 3.0/1.2


    • stop using V895 and used a discriminator (Phillips 708 set to ~100 mV) and logic unit (phillips 758)

Scope pict traces for TEK0020 -> TEK00

Ch1(Yellow)=Majority

Ch2(Blue)=Beam SYNC

Ch3(Pink)=Annih. Det. #1

Ch4(Green)=Annih. Det. #2

Data Analysis

Replay

running the decoder using the personal account on the opsmdaq0 failed; perhaps due to problems writing its output to the /data disk

to convert a data file into a rood file I needed to login to opsdaq0 under the username "idaq"

then execute the following command

 /work1/fanchini/decoder/fadc_decode_Source /data/annihilation/Annihilation_Sample_4086.dat

This created the summary text file and root file for run 4086

MakeClass

Load up the ntuple and click over to the "T" tree

Then onthe command line type

T->MakeClass();