05/09/2011 source test - Revision history

Shaproma at 19:00, 24 May 2012

2012-05-24T19:00:29Z

Shaproma at 16:44, 3 June 2011

2011-06-03T16:44:31Z

Shaproma at 05:18, 14 May 2011

2011-05-14T05:18:33Z

Shaproma at 05:08, 14 May 2011

2011-05-14T05:08:12Z

Shaproma at 05:04, 14 May 2011

2011-05-14T05:04:59Z

Shaproma at 04:21, 14 May 2011

2011-05-14T04:21:00Z

Shaproma at 04:20, 14 May 2011

2011-05-14T04:20:34Z

Shaproma at 04:19, 14 May 2011

2011-05-14T04:19:54Z

Shaproma at 04:17, 14 May 2011

2011-05-14T04:17:25Z

Shaproma: Created page with '[https://wiki.iac.isu.edu/index.php/N%27s_detector_calibration Go Back] I did some counts test like: 400px The distances are: between PS1 and PS2:…'

2011-05-14T04:15:29Z

Created page with '[https://wiki.iac.isu.edu/index.php/N%27s_detector_calibration Go Back] I did some counts test like: 400px The distances are: between PS1 and PS2:…'

New page

[https://wiki.iac.isu.edu/index.php/N%27s_detector_calibration Go Back]

I did some counts test like:

[[File:Detector1.png | 400px]]

The distances are:

between PS1 and PS2: 8 cm
between PS1 and n's: 2.5 cm
between PS2 and n's: 1.5 cm
between PS1&2 and n's PMT: 80 cm

The powers were:

PS1 and PS2: -1000 V (the new power supply C.A.E.N N471)
n's: -1100 V (the old power supply AEC 315 B)

The PMT for n's detectors is [http://sales.hamamatsu.com/index.php?id=13189439&src=newproductpage PMT HAMAMATSU R580] with supply voltage 1250/1500 V. But I have used the value above, because I though the counts rate was reasonable. See my table below.

The thresholds were:

PS1 and PS2: -80 mV
n's: -60 mV

Let see what we have. 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" |
! scope="col" width="50" | counts/min (1 min test)
! scope="col" width="50" | counts/min (1 min test)
! scope="col" width="50" | counts/min (5 min test)
! scope="col" width="50" | counts/min (5 min test)
! scope="col" width="50" | avg counts/min
|-
!PS1
|153 ||170 ||132.4 ||143 ||'''149.6'''
|-
!PS2
|150 ||173 ||175.6 ||157 ||'''163.9'''
|-
!PS1+PS2
|3.8 (5 min test)||5.8 (5 min test)||5.8 ||4.4 ||'''4.95'''
|-
!n's
|358 ||378 ||373.6 ||354.3 ||'''365.9'''
|}

Second the CF-243 source is somewhere aside (on the table 40 - 60 cm away from detectors. That test supposed to be initially as test without CF243 source and I just put the isotope away from detectors somewhere on the table, but as happened the PS detectors was able to see the source):
{| border="1" cellspacing="0" style="text-align: center; width: 500px; height: 100px;"
! scope="col" width="50" |
! scope="col" width="50" | counts/min (1 min test)
! scope="col" width="50" | counts/min (1 min test)
! scope="col" width="50" | avg counts/min
|-
!PS1
|373 ||362 ||'''367.5'''
|-
!PS2
|654 ||656 ||'''655'''
|-
!PS1+PS2
|2.0 ||6.0 ||'''4'''
|-
!n's
|358 || ||'''358'''
|}

Third 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" |
! scope="col" width="50" | counts/min (1 min test)
! scope="col" width="50" | counts/min (1 min test)
! scope="col" width="50" | counts/min (1 min test)
! scope="col" width="50" | counts/min (1 min test)
! scope="col" width="50" | avg counts/min
|-
!PS1
|364,570 ||363,477 ||341,157 ||341,729 ||'''352,733.3'''
|-
!PS2
|19,832 ||19,980||19,384 ||19,062 ||'''19,564.5'''
|-
!PS1+PS2
|993 ||959 ||908 ||903 ||'''940.8'''
|-
!n's
|369 ||352 ||375 ||369 ||'''366.3'''
|}

Now the CF-243 source is on the top of n's detector:
{| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
! scope="col" width="50" |
! scope="col" width="50" | counts/min (1 min test)
! scope="col" width="50" | counts/min (1 min test)
! scope="col" width="50" | counts/min (1 min test)
! scope="col" width="50" | counts/min (1 min test)
! scope="col" width="50" | avg counts/min
|-
!n's
|362 ||319 ||374 ||398 ||'''363.3'''
|}

What about the PS's detectors. I can concluded that detectors works good, detects the cosmic, and increase the counts as the external source approaches the detectors.

What about the n's detector. The counts rate 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?

I am going to increase the power supply for HAMAMATSU, adjust threshold and see what happens.

← 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 05:08, 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 05:04, 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]

@@ Line 54: / Line 54: @@
-'''Second the CF-243 source is somewhere aside (on the table 40 - 60 cm away from detectors.''' That test supposed to be initially as test without CF243 source and I just put the isotope away from detectors somewhere on the table, but as happened the PS detectors was able to see the source):
+'''Second the CF-243 source is somewhere aside (on the table 40 - 60 cm away from detectors.'''
 {| border="1" cellspacing="0" style="text-align: center; width: 500px; height: 100px;"
 ! scope="col" width="50" |

@@ Line 29: / Line 29: @@
-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" |

← Older revision		Revision as of 04:17, 14 May 2011
Line 110:		Line 110:


−	What about the PS's detectors. I can concluded that detectors works good, detects the cosmic, and increase the counts as the external source approaches the detectors.	+	:▫ What about the PS's detectors. I can concluded that detectors works good, detects the cosmic, and increase the counts as the external source approaches the detectors.
		+	:▫ What about the n's detector. The counts rate 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?

−	What about the n's detector. The counts rate 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?

	I am going to increase the power supply for HAMAMATSU, adjust threshold and see what happens.		I am going to increase the power supply for HAMAMATSU, adjust threshold and see what happens.