05/19/2011 n's detector threshold calibration source/(w/source) - Revision history

Shaproma at 19:01, 24 May 2012

2012-05-24T19:01:44Z

← Older revision		Revision as of 19:01, 24 May 2012
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	[https://wiki.iac.isu.edu/index.php/~~N%27s_detector_calibration Go Back~~]		[https://wiki.iac.isu.edu/index.php/Roman_measurements go back]

2011-06-03T20:14:47Z

← Older revision		Revision as of 20:14, 3 June 2011
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	Below are Jason's data and calculations:		Below are Jason's data and calculations:

	[[File:Table Jason.png \| ~~1000px~~]]		[[File:Table Jason.png \| 1200px]]

	And below I overlay my and Jason's results (linear scale):		And below I overlay my and Jason's results (linear scale):

2011-06-03T20:13:59Z

← Older revision		Revision as of 20:13, 3 June 2011
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	=Let's recalculate all data using the formula:=		==Let's recalculate all data using the formula:==

	<math>\mbox{Ratio} = \frac{R_s - R_{w/s}}{R_{w/s}}</math>		<math>\mbox{Ratio} = \frac{R_s - R_{w/s}}{R_{w/s}}</math>
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	=Let's compare with what Jason did (at different place,different time and different PMT):=		==Let's compare with what Jason did (at different place,different time and different PMT):==

	Below are Jason's data and calculations:		Below are Jason's data and calculations:

2011-06-03T20:13:39Z

← Older revision		Revision as of 20:13, 3 June 2011
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	Below are my counts rate measurements as function of threshold voltage for n's detector. The source was CF252. The distance between source and n's PMT was about 50 cm. It was 1 PMT set up detector and experiment was hold in LDS on May 19 2011.		Below are my counts rate measurements as function of threshold voltage for n's detector. The source was CF252. The distance between source and n's PMT was about 50 cm. It was 1 PMT set up detector and experiment was hold in LDS on May 19 2011.

	=First the counts rate was calculated as=:		==First the counts rate was calculated as:==

	<math>\mbox{Rate} = \frac{N_{\mbox{source}} - N_{\mbox{w/source}}}{\mbox{Time}}</math>		<math>\mbox{Rate} = \frac{N_{\mbox{source}} - N_{\mbox{w/source}}}{\mbox{Time}}</math>

2011-06-03T20:13:17Z

← Older revision		Revision as of 20:13, 3 June 2011
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	Below are my counts rate measurements as function of threshold voltage for n's detector. The source was CF252. The distance between source and n's PMT was about 50 cm. It was 1 PMT set up detector and experiment was hold in LDS on May 19 2011.		Below are my counts rate measurements as function of threshold voltage for n's detector. The source was CF252. The distance between source and n's PMT was about 50 cm. It was 1 PMT set up detector and experiment was hold in LDS on May 19 2011.

	First the counts rate was calculated as:		=First the counts rate was calculated as=:

	<math>\mbox{Rate} = \frac{N_{\mbox{source}} - N_{\mbox{w/source}}}{\mbox{Time}}</math>		<math>\mbox{Rate} = \frac{N_{\mbox{source}} - N_{\mbox{w/source}}}{\mbox{Time}}</math>
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	Let's recalculate all data using the formula:		=Let's recalculate all data using the formula:=

	<math>\mbox{Ratio} = \frac{R_s - R_{w/s}}{R_{w/s}}</math>		<math>\mbox{Ratio} = \frac{R_s - R_{w/s}}{R_{w/s}}</math>
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	Let's compare with what Jason did (at different place,different time and different PMT):		=Let's compare with what Jason did (at different place,different time and different PMT):=

	Below are Jason's data and calculations:		Below are Jason's data and calculations:

2011-06-03T20:12:37Z

← Older revision		Revision as of 20:12, 3 June 2011
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	Below are Jason's data and calculations:		Below are Jason's data and calculations:

	[[File:Table Jason.png \| ~~100px~~]]		[[File:Table Jason.png \| 1000px]]

	And below I overlay my and Jason's results (linear scale):		And below I overlay my and Jason's results (linear scale):

2011-06-03T20:11:27Z

← Older revision		Revision as of 20:11, 3 June 2011
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	[[File:Det ratio lin.png \| 1000px]]		[[File:Det ratio lin.png \| 1000px]]

	and ~~for~~ log scale:		and in log scale:

	[[File:Det ratio log.png \| 1000px]]		[[File:Det ratio log.png \| 1000px]]
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	# The power supply voltage is as expected -1500 V (there are no plateau for -1250 V)		# The power supply voltage is as expected -1500 V (there are no plateau for -1250 V)

	~~And there are some discrepancy with Jason's measurements which he did at different place and time and with different PMT and looks like:~~

	[[File:~~Jasons callibration~~.png \| ~~800px~~]]
			Let's compare with what Jason did (at different place,different time and different PMT):

			Below are Jason's data and calculations:

			[[File:Table Jason.png \| 100px]]

			And below I overlay my and Jason's results (linear scale):

			[[File:Det ratio1 lin.png \| 1000px]]

			and in log scale:

			[[File:Det ratio1 log.png \| 1000px]]



			Looks different.
			*PMT?
			*location?




	[https://wiki.iac.isu.edu/index.php/05/19/2011_n%27s_detector_threshold_calibration_source/%28w/source%29 go up]		[https://wiki.iac.isu.edu/index.php/05/19/2011_n%27s_detector_threshold_calibration_source/%28w/source%29 go up]

2011-06-03T16:43:01Z

← Older revision		Revision as of 16:43, 3 June 2011
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	There are two important ~~conclusion~~ at least for this type of PMT was used:		There are two important conclusions at least for this type of PMT was used:

	# The desirable threshold is about -50 mV		# The desirable threshold is about -50 mV

2011-06-03T16:40:37Z

← Older revision		Revision as of 16:40, 3 June 2011
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	[[File:Jasons callibration.png \| 800px]]		[[File:Jasons callibration.png \| 800px]]



			[https://wiki.iac.isu.edu/index.php/05/19/2011_n%27s_detector_threshold_calibration_source/%28w/source%29 go up]

2011-06-03T16:39:56Z

← Older revision		Revision as of 16:39, 3 June 2011
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	# The power supply voltage is as expected -1500 V (there are no plateau for -1250 V)		# The power supply voltage is as expected -1500 V (there are no plateau for -1250 V)

	And ~~also~~ some ~~difference~~ with		And there are some discrepancy with Jason's measurements which he did at different place and time and with different PMT and looks like:

			[[File:Jasons callibration.png \| 800px]]