05/10/2011 - Revision history

Shaproma at 21:16, 10 May 2011

2011-05-10T21:16:40Z

2011-05-10T21:14:53Z

2011-05-10T17:20:04Z

2011-05-10T17:18:53Z

2011-05-10T17:17:18Z

2011-05-10T17:16:39Z

2011-05-10T17:09:07Z

2011-05-10T17:08:48Z

2011-05-10T17:03:34Z

2011-05-10T16:50:33Z

@@ Line 88: / Line 88: @@
-So the same results as before:
+The same results as before:
 :PS detectors probably detect the cosmic rays and very sensitive to the radioactive source.
-:The counts rate 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?
+: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?

← Older revision		Revision as of 21:14, 10 May 2011
Line 39:		Line 39:
	\|}		\|}

−	Interesting. The same power for HAMAMATSU PMT, but different counts result (see my test on 05/09/2011).	+	Interesting. The same power for HAMAMATSU PMT, but different counts result (see my test on 05/09/2011). At this point I do not really know what the voltage I am supplying. Assume the new power supply C.A.E.N N471 is the good one.

@@ Line 90: / Line 90: @@
 So the same results as before:
-PS detectors probably detect the cosmic and very sensitive the radioactive source.
+:PS detectors probably detect the cosmic rays and very sensitive to the radioactive source.
-The counts rate 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?
+:The counts rate 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?

← Older revision		Revision as of 17:18, 10 May 2011
Line 43:		Line 43:


−	Now I increased the power supply for HAMAMATSU PMT (-1500 V) 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):

← Older revision		Revision as of 17:17, 10 May 2011
Line 92:		Line 92:
	PS detectors probably detect the cosmic and very sensitive the radioactive source.		PS detectors probably detect the cosmic and very sensitive the radioactive source.

−	The counts rate 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~~? But why the count rate are so big~~?	+	The counts rate 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?

← Older revision		Revision as of 17:16, 10 May 2011
Line 86:		Line 86:
	\|200\|\|210\|\|228\|\|219\|\|'''214.2'''		\|200\|\|210\|\|228\|\|219\|\|'''214.2'''
	\|}		\|}
		+
		+
		+	So the same results as before:
		+
		+	PS detectors probably detect the cosmic and very sensitive the radioactive source.
		+
		+	The counts rate 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? But why the count rate are so big?

@@ Line 78: / Line 78: @@
 |-
 !PS2
-|22,729||22,819||22,572||22,530||'''22662.5'''
+|22,729||22,819||22,572||22,530||'''22,662.5'''
 |-
 !PS1+PS2

@@ Line 75: / Line 75: @@
 |-
 !PS1
-|378,893||378,612||377,909||378,665||
+|378,893||378,612||377,909||378,665||'''378,519.7'''
 |-
 !PS2
-|22,729||22,819||22,572||22,530||
+|22,729||22,819||22,572||22,530||'''22662.5'''
 |-
 !PS1+PS2
-|1044||
+|1044||1021||1023||975||'''1015.7'''
 |-
 !n's
-|200||210||228||219||
+|200||210||228||219||'''214.2'''
 |}

← Older revision		Revision as of 16:50, 10 May 2011
Line 39:		Line 39:
	\|}		\|}

−	Interesting. The same power for HAMAMATSU PMT, but different counts result.	+	Interesting. The same power for HAMAMATSU PMT, but different counts result (see my test on 05/09/2011).