CH He3 Attenuation Measurements: 3 Different Cf252 Sources

Attenuation Experiment using New Modules in Electronics Chain and Inside Borated Poly Box

Electronics Chain (Poly Box)

Include schematic of electronics chain

Components

Each component of electronics chain with make/model, function, and brief description of why it's present

Ortec 142PC Pre-amp

Pre-amp for the He3 tube

CAEN Quad Linear Fan In - Fan Out Model N25 Tag #15687

• The fan in/out is used to duplicate the pulse to run the spec amp and watch the signal on the scope for any anomalies.

• The fan in/out is also used to invert the signal from the spec amp to send a negative pulse to the discriminator to trigger the scalar.

Ortec Spec Amp Model 672

• 10x Course Gain

• 1x Fine Gain

• 0.5us Shaping Time

• Uni Shaping: Gaussian

• Input: Norm (+)

• Output: Unipolar

• Manual Pole Zero adjustment

LeCroy Discriminator Model 821 Serial #B16303

• Variable threshold

• Pulse width as measured on scope: ~43ns

Plateau Measurements

1250V Plateau Measurements
Run Number	Configuration	Discriminator Threshold (mV)	Cf-252 Source	Counts	Run Time (Sec)	Count Rate (Hz)	Uncertainty
1	Detector on poly blocks at +1250V	30	Yes		100
2	Detector on poly blocks at +1250V	40	Yes		100
3	Detector on poly blocks at +1250V	50	Yes		100
4	Detector on poly blocks at +1250V	60	Yes		100
5	Detector on poly blocks at +1250V	70	Yes		100
6	Detector on poly blocks at +1250V	80	Yes		100
7	Detector on poly blocks at +1250V	90	Yes		100
8	Detector on poly blocks at +1250V	100	Yes		100

Background Measurements

1250V Background Measurements
Run Number	Configuration	Discriminator Threshold (mV)	Cf-252 Source	Counts	Run Time (Sec)	Count Rate (Hz)	Uncertainty
1	Detector on 3D printed stands at +1250V	255	No		100
2	Detector on 3D printed stands at +1250V	255	No		100
3	Detector on 3D printed stands at +1250V	255	No		100
4	Detector on 3D printed stands at +1250V	255	No		100
5	Detector on 3D printed stands at +1250V	255	No		100

Poly Box Attenuation Measurements

Open Source

1250V source in
Run Number	Configuration	Discriminator Threshold (mV)	Cf-252 Source	Counts	Run Time (Sec)	Count Rate (Hz)	Uncertainty
1	Detector on poly at +1250V	80	Yes		100
2	Detector on poly at +1250V	80	Yes		100
3	Detector on poly at +1250V	80	Yes		100
4	Detector on poly at +1250V	80	Yes		100
5	Detector on poly at +1250V	80	Yes		100

2" Green poly (one brick) in Box

1250V source in
Run Number	Configuration	Discriminator Threshold (mV)	Cf-252 Source	Counts	Run Time (Sec)	Count Rate (Hz)	Uncertainty
1	Detector on poly at +1250V	80	Yes	764	100
2	Detector on poly at +1250V	80	Yes	819	100
3	Detector on poly at +1250V	80	Yes	818	100
4	Detector on poly at +1250V	80	Yes	815	100
5	Detector on poly at +1250V	80	Yes	913	100

4" Green poly (two bricks) in Box

1250V source in
Run Number	Configuration	Discriminator Threshold (mV)	Cf-252 Source	Counts	Run Time (Sec)	Count Rate (Hz)	Uncertainty
1	Detector on poly at +1250V	80	Yes	486	100
2	Detector on poly at +1250V	80	Yes	509	100
3	Detector on poly at +1250V	80	Yes	531	100
4	Detector on poly at +1250V	80	Yes	544	100
5	Detector on poly at +1250V	80	Yes	530	100

6" Green poly (three bricks) in Box

1250V source in
Run Number	Configuration	Discriminator Threshold (mV)	Cf-252 Source	Counts	Run Time (Sec)	Count Rate (Hz)	Uncertainty
1	Detector on poly at +1250V	80	Yes	415	100
2	Detector on poly at +1250V	80	Yes	373	100
3	Detector on poly at +1250V	80	Yes	380	100
4	Detector on poly at +1250V	80	Yes	397	100
5	Detector on poly at +1250V	80	Yes	419	100

8" Green poly (four bricks) in Box

1250V source in
Run Number	Configuration	Discriminator Threshold (mV)	Cf-252 Source	Counts	Run Time (Sec)	Count Rate (Hz)	Uncertainty
1	Detector on poly at +1250V	80	Yes	371	100
2	Detector on poly at +1250V	80	Yes	396	100
3	Detector on poly at +1250V	80	Yes	351	100
4	Detector on poly at +1250V	80	Yes	366	100
5	Detector on poly at +1250V	80	Yes	394	100

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