PAS Feasibility Preliminary Runs

General run plan

This experimental setup does not contain BorAl

• Run source in and source out in experimental setup and background subtract with NaI

• Move the source to different locations along the source tunnel and plot the different distances and count rates

• Run source in and source out in experimental setup and background subtract with He3

• Move the source to different locations along the source tunnel and plot the different distances and count rates

I will upload some models of the setup when I have updated the model to include the source and detector

7/19/21

NaI detector 30cm from converter

NaI Detector, 5mV threshold, +1000V on detector, no converter

Source Distance (cm)	Counts	Run Time (s)	Count Rate (Hz)	Uncertainty
39.5	1563	100
35	1631	100
30	1791	100
25	2054	100
20	2514	100
15	3375	100
10	6182	100

NaI Detector, 5mV threshold, +1000V on detector, with converter

Source Distance (cm)	Counts	Run Time (s)	Count Rate (Hz)	Uncertainty
39.5	1489	100
35	1581	100
30	1729	100
25	1936	100
20	2401	100
15	3249	100
10	5969	100

NaI Detector, 2mV threshold, +1000V on detector, no converter

Source Distance (cm)	Counts	Run Time (s)	Count Rate (Hz)	Uncertainty
39.5	2039	100
35	2228	100
30	2546	100
25	2960	100
20	3939	100
15	5349	100
10	10050	100

NaI Detector, 2mV threshold, +1000V on detector, with converter

Source Distance (cm)	Counts	Run Time (s)	Count Rate (Hz)	Uncertainty
39.5	2071	100
35	2225	100
30	2430	100
25	2825	100
20	3391	100
15	4861	100
10	9576	100

7/20/21

detector is 5cm from converter (5cm from end of detector tunnel towards source)

He3 detector, 1250V, no converter, 250mV threshold

Source Distance (cm)	Counts	Run Time (s)	Count Rate (Hz)	Uncertainty
39.5	478	100
35	676	100
30	1010	100
25	1604	100
20	2533	100
15	4017	100
10	6035	100

He3 detector, 1250V, with converter, 250mV threshold

Source Distance (cm)	Counts	Run Time (s)	Count Rate (Hz)	Uncertainty
39.5	146	200
35	140	200
30	228	200
25	186	100
20	278	100
15	546	100
10	729	100

7/21/21

Source at 10cm inside source tunnel

Running with NaI and ADC setup.

ADC is not calibrated. Running converter in and converter out.

Will swap to He3 detector following these and overlay the source in source out plots from the root files.

I will put all this into a table later

• NaI with converter: Run 7031 -> Red

• run start: 13:01:51
• run stop: 13:12:07

• NaI without converter: Run 7033 -> Blue

• Run 7032 failed 7 minutes in and was stopped by the computer

• run start: 13:17:30
• run stop: 13:27:27 or 13:37:27

He3 Runs

• He3 no converter: Run 7034 -> Blue

• run start: 15:46:25
• run stop: 15:57:38

• He3 with converter: Run 7035 -> Red

• run start: 16:01:34
• run stop: 16:11:28

NaI Overlay	He3 Overlay
NaI detector 30cm from Gd sheet placement. Red -> Gd present	He3 detector spanning the length of detector tunnel. Red -> Gd present

7/22/21

Results from scalar runs

2mV Threshold NaI	5mV Threshold NaI	He3 Tube

Adjusting discriminator threshold for NaI with/without converter

Source at 20cm, Converter in place

Threshold (mV)	Counts	Run Time (s)
60	422	100
70	307	100
80	262	100
90	226	100
100	198	100
110	187	100
120	165	100
130	174	100
140	158	100

Source at 20cm, Converter removed

Threshold (mV)	Counts	Run Time (s)
60	533	100
70	454	100
80	398	100
90	339	100
100	311	100
110	294	100
120	245	100
130	259	100
140	237	100

Source at 15cm, Converter removed

Threshold (mV)	Scalar Counts	Run Time (s)	Run Number
2	6287	100	7037
5	3972	100	7038
10	2834	100	7039
15	2355	100	7040
20	2032	100	7041
25		100
30		100
40		100
50		100
60		100
70		100
80		100
90		100
100		100
110		100
120		100
130		100
140		100
150		100
160		100
170		100
180		100
190		100
200		100
210		100
220		100
230		100
240		100
250		100

8/5/21

Today's game plan:

• Run spectroscopy with NaI detector extremely close to Gd converter
• Put BorAl into setup and run converter in/out
• If time, adjust setup for HPGe and run with uncalibrated setup

Run Number	Detector Type	Disc. Thr (mV)	BorAl	Cf-252 Source	Gd Converter	Start Time	End Time	RCGUI Events	Plot
7061	NaI ~1mm from Gd Conv. loc.	2mV	No	Yes, 20cm	No	10:27:35	10:32:54	419627	[[File:|50px|thumb|none|]]
7062	NaI ~1mm from Gd Conv. loc.	2mV	No	Yes, 20cm	Yes	10:41:45	10:46:56	407700	[[File:|50px|thumb|none|]]
7063	NaI ~1mm from Gd Conv. loc.	50mV	No	Yes, 20cm	Yes	11:02:42	11:07:52	29669	[[File:|50px|thumb|none|]]
7064	NaI ~1mm from Gd Conv. loc.	50mV	No	Yes, 20cm	No	11:12:41	11:17:54	24076	[[File:|50px|thumb|none|]]
7065	NaI ~1mm from Gd Conv. loc.	2mV	Yes	Yes, 20cm	Yes	13:07:04	13:13:45	360169	[[File:|50px|thumb|none|]]
7066	NaI ~1mm from Gd Conv. loc.	2mV	Yes	Yes, 20cm	No	13:17:39	13:22:45	276203	[[File:|50px|thumb|none|]]

Time factors (1/run time):

• 7061 = 0.0031348

• 7062 = 0.00321543

• 7065 = 0.00249377

• 7066 = 0.00326797

8/5/21 Plots

Gd In/Out 2mV Threshold	Zoom into >1MeV	Gd In/Out 50mV Threshold	Gd In/Out with BorAl 2mV Threshold	Overlay of Gd in/out with/out BorAl	High energy of Gd in/out with/out BorAl

8/6/21

Background run over the weekend

Run Number	Detector Type	Disc. Thr (mV)	BorAl	Cf-252 Source	Gd Converter	Start Time	End Time	Run Time (s)	RCGUI Events
7074	NaI ~1mm from Gd Conv. loc.	2mV	Yes	No	No	8/6/21 16:28:52	8/9/21 10:09:00 (rocdaq1 disconnect)	236,408 (2Dy 17Hr 40Min 8s)	2073152

• 7074 time factor = 0.00000422998

It seems evident that the low energy spikes seen in runs with Cf252 present are not from cosmics, as predicted. Background rate is ~0.01Hz, whereas low energy spike rates are ~40Hz with BorAl present. Current theory is that the spikes are from photons from Cf252 disintegration.

Random runs

7/22/21

Run 7042

• Background run, 6x amplification in timing filter amp on fine gain, 1x on course.
• 2mV threshold, no converter
• ~10min run time

Run 7043

• Cf252 source in run @ 20cm, 6x amplification in timing filter amp on fine gain, 1x on course.
• 2mV threshold, no converter
• ~6min run time

Run 7044

• Background run, source out of room, 6x amplification in timing filter amp on fine gain, 1x on course.
• 2mV threshold, no converter
• ~6.5min run time

Run 7045

• Cs137 on top of NaI crystal, 6x amplification in timing filter amp on fine gain, 1x on course.
• 2mV threshold, no converter
• ~50s run time -> 50000 counts

Run 7046

• Cs137 6in from NaI crystal, 6x amplification in timing filter amp on fine gain, 1x on course.
• 2mV threshold, no converter
• ~2min 40sec run time

Run 7047

• Cs137 6in from NaI crystal, 2x amplification in timing filter amp on fine gain, 1x on course.
• 2mV threshold, no converter
• ~1min 30s run time

Run 7048

• Cs137 6in from NaI crystal, 2x amplification in timing filter amp on fine gain, 1x on course. NO SIGNAL INTO ADC, still gating and read/write pulse.
• 2mV threshold, no converter
• ~2min run time

Run 7049

• Cs137 6in from NaI crystal, 8x amplification in timing filter amp on fine gain, 4x on course.
• 2mV threshold, no converter
• ~1min run time

Run 7050

• Cf252 source in with line of sight to NaI, 6x amplification in timing filter amp on fine gain, 1x on course.
• 2mV threshold, no converter
• ~45s run time

8/20/21

Run 7082

• Cs137 source for initial calibration at beginning of run
• Start time: 16:40:33 8/19/21
• End time: 10:50:29 8/20/21
• Events: 5649754

Run 7083

• Cs137 source for initial calibration at beginning of run
• Start time: 15:17:46 8/20/21
• End time: 15:39:44 8/20/21
• Events: 35932

Run 7086

• Cs137 source for initial calibration at beginning of run
• Cf252 present
• Gd converter present
• Start time: 8263 - 7577 = 686 sec (unix times) -> From the Joe program

• Time scaling factor 1/686 = 0.00146

Run 7087

• Cs137 source for initial calibration at beginning of run
• Cf252 NOT present
• Start time: 9034 - 8423 = 611 sec (unix times)

• Time scaling factor 1/611 = 0.00164

Run 7088

• Cs137 source for initial calibration at beginning of run
• Cf252 present
• Gd converter out
• Start time: (unix times)

• Time scaling factor 1/ =

Run 7089

• Cs137 removed around event 7000

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PAS Feasibility Study Runs