05/12/2011 random coincidence cosmic test - Revision history

Shaproma at 19:00, 24 May 2012

2012-05-24T19:00:53Z

← Older revision		Revision as of 19:00, 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]

Shaproma at 16:44, 3 June 2011

2011-06-03T16:44:58Z

← Older revision	Revision as of 16:44, 3 June 2011
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		[https://wiki.iac.isu.edu/index.php/N%27s_detector_calibration go back]

Shaproma at 05:19, 14 May 2011

2011-05-14T05:19:11Z

← Older revision		Revision as of 05:19, 14 May 2011
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	~~[https://wiki.iac.isu.edu/index.php/N%27s_detector_calibration Go Back]~~

Shaproma at 05:09, 14 May 2011

2011-05-14T05:09:53Z

← Older revision		Revision as of 05:09, 14 May 2011
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	The voltages, thresholds and widths are:		The voltages, thresholds and widths are:

Shaproma at 05:06, 14 May 2011

2011-05-14T05:06:53Z

← Older revision		Revision as of 05:06, 14 May 2011
Line 1:		Line 1:
	[https://wiki.iac.isu.edu/index.php/N%~~27s_detector_calibration~~ Go Back]		[https://wiki.iac.isu.edu/index.php/N%27s_det_calibration Go Back]

	The voltages, thresholds and widths are:		The voltages, thresholds and widths are:

Shaproma at 05:02, 14 May 2011

2011-05-14T05:02:56Z

← Older revision		Revision as of 05:02, 14 May 2011
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	[https://wiki.iac.isu.edu/index.php/N%27s_detector_calibration Go Back]		[https://wiki.iac.isu.edu/index.php/N%27s_detector_calibration Go Back]

	The voltages and ~~thresholds~~ are:		The voltages, thresholds and widths are:
	{\| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"		{\| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
	! scope="col" width="50" \|		! scope="col" width="50" \|

Shaproma at 04:51, 14 May 2011

2011-05-14T04:51:30Z

← Older revision		Revision as of 04:51, 14 May 2011
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	\|<math>10247\pm101.2</math>\|\|70 min\|\|<math>2.44\pm0.02</math>		\|<math>10247\pm101.2</math>\|\|70 min\|\|<math>2.44\pm0.02</math>
	\|-		\|-
	!PS1 (~~next day test~~)		!PS1 (May 13)
	\|<math>12178\pm110.3</math>\|\|80 min\|\|<math>2.54\pm0.02</math>		\|<math>12178\pm110.3</math>\|\|80 min\|\|<math>2.54\pm0.02</math>
	\|-		\|-
Line 35:		Line 35:
	\|<math>12969\pm113.9</math>\|\|70 min\|\|<math>3.09\pm0.03</math>		\|<math>12969\pm113.9</math>\|\|70 min\|\|<math>3.09\pm0.03</math>
	\|-		\|-
	!PS2 (~~next day test~~)		!PS2 (May 13)
	\|<math>14674\pm121.1</math>\|\|80 min\|\|<math>3.06\pm0.03</math>		\|<math>14674\pm121.1</math>\|\|80 min\|\|<math>3.06\pm0.03</math>
	\|-		\|-
Line 41:		Line 41:
	\|<math>3\pm1.7</math>\|\|70 min\|\|<math>(0.7\pm0.4)\cdot 10^{-3}</math>		\|<math>3\pm1.7</math>\|\|70 min\|\|<math>(0.7\pm0.4)\cdot 10^{-3}</math>
	\|-		\|-
	!PS1+PS2 (~~next day test~~)		!PS1+PS2 (May 13)
	\|<math>11\pm3.3</math>\|\|80 min\|\|<math>(2.3\pm0.7)\cdot 10^{-3}</math>		\|<math>11\pm3.3</math>\|\|80 min\|\|<math>(2.3\pm0.7)\cdot 10^{-3}</math>
	\|}		\|}

Shaproma at 04:50, 14 May 2011

2011-05-14T04:50:20Z

← Older revision		Revision as of 04:50, 14 May 2011
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	\|}		\|}

	~~The powers are:~~

	~~PS1 and PS2: -1000 V (the old 2-channel TENNELEC TC952)~~
	~~n's: -1100 V (the new 2-channel C.A.E.N N471)~~

	~~The thresholds are:~~

	~~PS1 and PS2: -80 mV~~
	~~n's: -200 mV~~

	~~The discriminator widths are:~~

	~~PS1: -20 ns~~
	~~PS2: -10 ns~~
	~~n's: -20 ns~~


	Let's do the '''random coincidence cosmic ray test 1'''.		Let's do the '''random coincidence cosmic ray test 1'''.

	PS1 and PS2 is about 30 cm away from each other. ~~And let~~'s look on the coincidence signal between PS1 and PS2.		PS1 and PS2 is about 30 cm away from each other. Let's look on the coincidence signal between PS1 and PS2.
	~~:70 min test was on May 12 2011~~
	~~:80 min test was on May 13 2011~~

	{\| border="1" cellspacing="0" style="text-align: center; width: 1000px; height: 100px;"		{\| border="1" cellspacing="0" style="text-align: center; width: 1000px; height: 100px;"
	! scope="col" width="50" \|		! scope="col" width="50" \|
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	!PS1		!PS1
	\|<math>10247\pm101.2</math>\|\|70 min\|\|<math>2.44\pm0.02</math>		\|<math>10247\pm101.2</math>\|\|70 min\|\|<math>2.44\pm0.02</math>
			\|-
			!PS1 (next day test)
			\|<math>12178\pm110.3</math>\|\|80 min\|\|<math>2.54\pm0.02</math>
	\|-		\|-
	!PS2		!PS2
	\|<math>12969\pm113.9</math>\|\|70 min\|\|<math>3.09\pm0.03</math>		\|<math>12969\pm113.9</math>\|\|70 min\|\|<math>3.09\pm0.03</math>
	\|-		\|-
	!PS1+PS2 ~~(30 cm away)~~		!PS2 (next day test)
			\|<math>14674\pm121.1</math>\|\|80 min\|\|<math>3.06\pm0.03</math>
			\|-
			!PS1+PS2
	\|<math>3\pm1.7</math>\|\|70 min\|\|<math>(0.7\pm0.4)\cdot 10^{-3}</math>		\|<math>3\pm1.7</math>\|\|70 min\|\|<math>(0.7\pm0.4)\cdot 10^{-3}</math>
	\|-		\|-
	~~!PS1~~		!PS1+PS2 (next day test)
	~~\|<math>12178\pm110.3</math>\|\|80 min\|\|<math>2.54\pm0.02</math>~~
	\|-
	~~!PS2~~
	~~\|<math>14674\pm121.1</math>\|\|80 min\|\|<math>3.06\pm0.03</math>~~
	\|-
	!PS1+PS2 (~~30 cm away~~)
	\|<math>11\pm3.3</math>\|\|80 min\|\|<math>(2.3\pm0.7)\cdot 10^{-3}</math>		\|<math>11\pm3.3</math>\|\|80 min\|\|<math>(2.3\pm0.7)\cdot 10^{-3}</math>
	\|}		\|}

Shaproma at 04:47, 14 May 2011

2011-05-14T04:47:26Z

← Older revision		Revision as of 04:47, 14 May 2011
Line 1:		Line 1:
	[https://wiki.iac.isu.edu/index.php/N%27s_detector_calibration Go Back]		[https://wiki.iac.isu.edu/index.php/N%27s_detector_calibration Go Back]

			The voltages and thresholds are:
			{\| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
			! scope="col" width="50" \|
			! scope="col" width="50" \| PMT voltage, V
			! scope="col" width="50" \| threshold, mV
			! scope="col" width="50" \| discr. width, ns
			\|-
			!PS1
			\| -1000\|\| -80\|\| 20
			\|-
			!PS1
			\| -1000\|\| -80\|\| 10
			\|}

	The powers are:		The powers are:

Shaproma at 04:08, 14 May 2011

2011-05-14T04:08:39Z

← Older revision		Revision as of 04:08, 14 May 2011
Line 85:		Line 85:

	So what we are measured?		So what we are measured?
	:○ purely random events from different reaction?. But why does the coincidence rate depend from distance between PS1 and PS2? Statistical fluctuation? ~~Electronics~~ false?		:○ purely random events from different reaction?. But why does the coincidence rate depend from distance between PS1 and PS2? Statistical fluctuation? Electronic false events?
	:○ or probably some coincidence events caused by air shower originated from one particle nearby the two detectors. Now if detectors located closer to each other the rate should be higher because the detectors are closer to initial particle. As evidence note that rates for PS1 and PS1 for different distances are almost the same. But the coincidence rate PS1+PS2 increased almost in 3 times as distance reduced from 30 cm to 5 cm. (That need to be studied)		:○ or probably some coincidence events caused by air shower originated from one particle nearby the two detectors. Now if detectors located closer to each other the rate should be higher because the detectors are closer to initial particle. As evidence note that rates for PS1 and PS1 for different distances are almost the same. But the coincidence rate PS1+PS2 increased almost in 3 times as distance reduced from 30 cm to 5 cm. (That need to be studied)

	Also Sadiq did something at that time with gamma source. Maybe that effected somehow my measurements.		Also Sadiq did something at that time with gamma source. Maybe that effected somehow my measurements.