Oportunistic Beam studies

Trigger Setup

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


The V895 "Maj" output is shown on Ch1 along with the NaI signal which was discriminated by it	You can see some pulses are measured after the pulse peak because of multiple hits out of the discriminator

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


I took the "MAJ" output and used a Phillips Gate Generator to extend the pulse length in order to stop multiple triggers	Extending thepulse length out of the discriminstor by adding a gate generator removes triggers that happened after the pulse output began.

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

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

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

Then onthe command line type

T->MakeClass();

Run#	run mode	Run length (sec)	Source	Trig Logic	VME discriminator Threshold (mV)	HV1 (setting/V) A1	HV2 (setting/V) A3	PL (setting/ns)	PTW (setting/ns)
4087	sample		Co-60	(Det1 OR Det2)	50	2.4/0.888	3.0/1.2
4088	sample		Na-22 (0.1 uCi)	(Det1 OR Det2)	50	2.4/0.888	3.0/1.2
4089	sample		Na-22 (10 uCi)	(Det1 OR Det2)	50	2.4/0.888	3.0/1.2
4090	sample		Na-22 (10 uCi)	(Det1 AND Det2)	50	2.4/0.888	3.0/1.2
4090	sample		Na-22 (10 uCi)	(Det1 AND Det2)	50	2.4/0.888	3.0/1.2
4092	sample		Na-22 (10 uCi)	(Det1 OR Det2)	50	2.2/0.888	3.0/1.2
4093	sample		Co-60 (10 uCi)	(Det1 OR Det2)	50	2.2/0.888	3.0/1.2
4094	sample		Na-22 (10 uCi)	(Det1AND Det2)	50	2.2/0.888	3.0/1.2

I get higher energy photons in the energy spectra as the beam current goes down?