04-20-2015 - Revision history

Foretony: /* Change discriminator threshold with terminators out */

2015-04-20T18:43:01Z

Change discriminator threshold with terminators out

2015-04-20T18:35:47Z

Change discriminator threshold with terminators out

2015-04-20T18:33:41Z

Change discriminator threshold with terminators out

2015-04-20T18:21:55Z

Change discriminator threshold with terminators out

2015-04-20T18:10:53Z

Change discriminator threshold with terminators out

2015-04-20T18:09:00Z

Change discriminator threshold with terminators out

2015-04-20T18:08:25Z

Change discriminator threshold with terminators out

2015-04-20T18:05:52Z

Change discriminator threshold with terminators in

2015-04-20T18:04:23Z

Change discriminator threshold with terminators in

2015-04-20T17:57:54Z

Change discriminator threshold with terminators in

← Older revision		Revision as of 18:43, 20 April 2015
Line 95:		Line 95:

	Using the scope I did not observe an attenuation of the PMT output by more than a factor of two when inserting 50 ohm terminators on both ends of the cable.		Using the scope I did not observe an attenuation of the PMT output by more than a factor of two when inserting 50 ohm terminators on both ends of the cable.
		+
		+
		+	I still see the ring when the discriminator is set to 60 mV and the terminators are out. If I insert the terminators I do not see the ring at a discriminator threshold of 16 mV.
		+
		+	Unless the 50 Ohm terminators are attenuating the signal by more than a factor of 2, the attenuators appear to also be removing some of the "ring" output of the PMT base.
		+



	[[2nCor_44#Run_Plan]]		[[2nCor_44#Run_Plan]]

← Older revision		Revision as of 18:35, 20 April 2015
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	[[File:r4541_PMT4_TDCmultihits.png \| 200 px]]		[[File:r4541_PMT4_TDCmultihits.png \| 200 px]]
		+
		+
		+	Run 4541 had a discriminator threshold set to 60 mv and the terminators were out.
		+
		+	[[File:r4543_PMT4_TDCmultihits.png \| 200 px]]

	Run 4542 had a discriminator threshold set to 100 mv and the terminators were out.		Run 4542 had a discriminator threshold set to 100 mv and the terminators were out.

@@ Line 89: / Line 89: @@
 But are the terminators reducing the ring effect by attenuating or by reducing reflections (the ring) in the output pulse.
+Using the scope I did not observe an attenuation of the PMT output by more than a factor of two when inserting 50 ohm terminators on both ends of the cable.
 [[2nCor_44#Run_Plan]]

← Older revision		Revision as of 18:21, 20 April 2015
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	[[File:r4542_PMT4_TDCmultihits.png \| 200 px]]		[[File:r4542_PMT4_TDCmultihits.png \| 200 px]]
		+
		+
		+	clearly one can turn up the threshold high enough to get rid of the ring with the terminators out.
		+
		+	But are the terminators reducing the ring effect by attenuating or by reducing reflections (the ring) in the output pulse.
		+

← Older revision		Revision as of 18:10, 20 April 2015
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	[[File:r4540_PMT4_TDCmultihits.png \| 200 px]]		[[File:r4540_PMT4_TDCmultihits.png \| 200 px]]
		+
		+	Run 4541 had a discriminator threshold set to 30 mv and the terminators were out.
		+
		+	[[File:r4541_PMT4_TDCmultihits.png \| 200 px]]
		+
		+	Run 4542 had a discriminator threshold set to 100 mv and the terminators were out.
		+
		+	[[File:r4542_PMT4_TDCmultihits.png \| 200 px]]

← Older revision		Revision as of 18:09, 20 April 2015
Line 71:		Line 71:

	PMT detector #4 HV at -1000 Volts		PMT detector #4 HV at -1000 Volts
−
−

	Run 4540 had a discriminator threshold set to 16 mv and the terminators were out.		Run 4540 had a discriminator threshold set to 16 mv and the terminators were out.

← Older revision		Revision as of 18:08, 20 April 2015
Line 74:		Line 74:


−	Run 4540 had a discriminator threshold set to ~~100~~ mv and the terminators were out.	+	Run 4540 had a discriminator threshold set to 16 mv and the terminators were out.

−	[[File:~~r4537_PMT4_TDCmultihits~~.png \| 200 px]]	+	[[File:r4540_PMT4_TDCmultihits.png \| 200 px]]

@@ Line 44: / Line 44: @@
-Run 4537 had a discriminator threshold set to 100 mv and the terminators were in.  I see
+Run 4537 had a discriminator threshold set to 100 mv and the terminators were in.  I see very few multiple hits in Detector 4
 [[File:r4537_PMT4_TDCmultihits.png | 200 px]]
@@ Line 65: / Line 65: @@
 [[File:r4539_PMT4_TDCmultihits.png | 200 px]]
 [[2nCor_44#Run_Plan]]

← Older revision		Revision as of 18:04, 20 April 2015
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	[[File:r4538_PMT4_TDCmultihits.png \| 200 px]]		[[File:r4538_PMT4_TDCmultihits.png \| 200 px]]
		+
		+
		+	Now change threshold to 16 mv
		+
		+	Run 4539
		+
		+	[[File:r4539_PMT4_TDCmultihits.png \| 200 px]]
		+


	[[2nCor_44#Run_Plan]]		[[2nCor_44#Run_Plan]]

← Older revision		Revision as of 17:57, 20 April 2015
Line 44:		Line 44:


−	Run 4537 had a discriminator threshold set to 100 mv and the terminators were in.	+	Run 4537 had a discriminator threshold set to 100 mv and the terminators were in. I see
		+
		+	[[File:r4537_PMT4_TDCmultihits.png \| 200 px]]
		+

	Now change threshold to 30 mv		Now change threshold to 30 mv