05/10/2011 source test continue - Revision history

Shaproma at 19:00, 24 May 2012

2012-05-24T19:00:39Z

2011-06-03T16:44:43Z

2011-05-14T05:18:48Z

2011-05-14T05:09:06Z

2011-05-14T05:06:07Z

2011-05-14T04:45:11Z

2011-05-14T04:44:16Z

2011-05-14T04:43:42Z

2011-05-14T04:41:39Z

2011-05-14T04:22:22Z

← 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]

← 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]

← Older revision		Revision as of 05:18, 14 May 2011
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−	~~[https://wiki.iac.isu.edu/index.php/N%27s_detector_calibration Go Back]~~	+

← Older revision		Revision as of 05:09, 14 May 2011
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−	[https://wiki.iac.isu.edu/index.php/N%~~27s_det_calibration~~ Go Back]	+	[https://wiki.iac.isu.edu/index.php/N%27s_detector_calibration Go Back]

← Older revision		Revision as of 05:06, 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_det_calibration Go Back]

← Older revision		Revision as of 04:45, 14 May 2011
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−	Now I increased the power supply for HAMAMATSU PMT (-1500 V as specified in the data sheet [http://sales.hamamatsu.com/index.php?id=13189439&src=newproductpage]) and adjusted the threshold (-500 mV). All other parameters are the same.	+	Now I increased the power supply for HAMAMATSU PMT '''(-1500 V as specified in the data sheet [http://sales.hamamatsu.com/index.php?id=13189439&src=newproductpage]) and adjusted the threshold (-500 mV)'''. All other parameters are the same.

	'''First he CF-243 source is far far away (sealed in the safe):'''		'''First he CF-243 source is far far away (sealed in the safe):'''

@@ Line 17: / Line 17: @@
 |-
 !PS1
-| -1000|| -80|| 20
+| -1000|| -80
 |-
 !PS1
-| -1000|| -80|| 10
+| -1000|| -80
 |-
 !n's
-| -1100|| -60|| 20
+| -1100|| -60
 |}

← Older revision		Revision as of 04:43, 14 May 2011
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−	First I change the power supply for HAMAMATSU PMT from old one to the new ~~2 channel~~ one C.A.E.N N471	+	First I change the power supply for HAMAMATSU PMT from old one AEC 315 B to the new one C.A.E.N N471
		+
		+
		+	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
		+	\|-
		+	!PS1
		+	\| -1000\|\| -80\|\| 20
		+	\|-
		+	!PS1
		+	\| -1000\|\| -80\|\| 10
		+	\|-
		+	!n's
		+	\| -1100\|\| -60\|\| 20
		+	\|}
		+

	The powers are:		The powers are:

← Older revision		Revision as of 04:41, 14 May 2011
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−	First I change the power supply for HAMAMATSU PMT to the new 2 channel one C.A.E.N N471	+	First I change the power supply for HAMAMATSU PMT from old one to the new 2 channel one C.A.E.N N471

	The powers are:		The powers are:

@@ Line 20: / Line 20: @@
-Let see what we have. First he CF-243 source is far far away (sealed in the safe):
+Let see what we have.
 {| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
 ! scope="col" width="50" |
@@ Line 45: / Line 46: @@
 Now I increased the power supply for HAMAMATSU PMT (-1500 V as specified in the data sheet [http://sales.hamamatsu.com/index.php?id=13189439&src=newproductpage]) and adjusted the threshold (-500 mV). All other parameters are the same.
-First he CF-243 source is far far away (sealed in the safe):
+'''First he CF-243 source is far far away (sealed in the safe):'''
 {| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
 ! scope="col" width="50" |
@@ Line 65: / Line 66: @@
-Now the CF-243 source is on the top of PS1:
+'''Now the CF-243 source is on the top of PS1:'''
 {| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
 ! scope="col" width="50" |
@@ Line 90: / Line 91: @@
 The same results as before:
-:PS detectors probably detect the cosmic rays and very sensitive to the radioactive source.
+:▫ PS detectors probably detect the cosmic rays and very sensitive to the radioactive source.
+:▫ The count rates for n's detector is basically the same with and without the source CF243. So what we are really detect? Cosmic? Then why the rate does not depend from source. Internal noise of PMT?