Difference between revisions of "05/13/2011 coincidence test"

Latest revision as of 17:27, 16 May 2011

Set up like that:

The voltages, thresholds and widths are as below. Note: I increased my thresholds for PS1 and PS2 from 80 mV up to 100 mV according to my previous calibration threshold line.

	PMT voltage, V	threshold, mV	discr. width, ns
PS1	-1000	-100	50
PS1	-1000	-100	50
n's	-1500	-200	10

First let's do the PS1+PS2 coincidence test.

1. The distance between PS and n's PMT is about 80 cm

	counts	time	counts/sec
PS1	$2823\pm53.1$	20 min	$2.35\pm0.04$
PS2	$3091\pm55.6$	20 min	$2.58\pm0.05$
PS1+PS2	$93\pm9.6$	20 min	$(7.7\pm0.8)\cdot 10^{-2}$

2. The distance between PS and n's PMT is about 50 cm

	counts	time	counts/sec
PS1	$7513\pm86.5$	60 min	$2.09\pm0.02$
PS2	$9036\pm95.1$	60 min	$2.51\pm0.03$
PS1+PS2	$251\pm15.8$	60 min	$(6.9\pm0.4)\cdot 10^{-2}$

Second do the PS1+PS2+n's coincidence test

1. The distance between PS and n's PMT is about 80 cm

	counts	time	counts/sec
PS1	$3229\pm56.8$	20 min	$2.69\pm0.05$
PS2	$3192\pm56.5$	20 min	$2.66\pm0.05$
PS1+PS2+n's	$59\pm7.7$	20 min	$(4.9\pm0.6)\cdot 10^{-2}$

2. The distance between PS and n's PMT is about 50 cm

	counts	time	counts/sec
PS1	$7700\pm87.7$	60 min	$2.14\pm0.02$
PS2	$9060\pm95.2$	60 min	$2.52\pm0.03$
PS1+PS2+n's	$214\pm14.6$	60 min	$(5.9\pm0.4)\cdot 10^{-2}$

The scope pictures of coincidence events looks like:

PS1+PS2 event looks like:	PS1+PS2+n event looks like:

@@ Line 1: / Line 1: @@
+[https://wiki.iac.isu.edu/index.php/N%27s_detector_calibration Go Back]
@@ Line 27: / Line 28: @@
-'''First let's do the PS1+PS2 coincidence test'''the distance between PS and n's PMT is abot 80 cm
+'''First let's do the PS1+PS2 coincidence test'''.
+. The distance between PS and n's PMT is about 80 cm
 {| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
 ! scope="col" width="50" |
@@ Line 44: / Line 47: @@
 |}
-'''First let's do the PS1+PS2 coincidence test'''the distance between PS and n's PMT is abot 50 cm
+. The distance between PS and n's PMT is about 50 cm
 {| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
 ! scope="col" width="50" |
@@ Line 63: / Line 66: @@
+'''Second do the PS1+PS2+n's coincidence test '''
-The scope picture of PS1+PS2 coincidence event like:
+. The distance between PS and n's PMT is about 80 cm
-[[File:Cosmic coinc PS1 PS2.png | 800px]]
-'''Second tet's do the PS1+PS2+n's coincidence test '''
 {| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
 ! scope="col" width="50" |
@@ Line 88: / Line 85: @@
 |}
+. The distance between PS and n's PMT is about 50 cm
+{| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
+! scope="col" width="50" |
+! scope="col" width="50" | counts
+! scope="col" width="50" | time
+! scope="col" width="50" | counts/sec
+|-
+!PS1
+|<math>7700\pm87.7</math>||60 min||<math>2.14\pm0.02</math>
+|-
+!PS2
+|<math>9060\pm95.2</math>||60 min||<math>2.52\pm0.03</math>
+|-
+!PS1+PS2+n's
+|<math>214\pm14.6</math>||60 min||<math>(5.9\pm0.4)\cdot 10^{-2}</math>
+|}
-The scope picture of PS1+PS2 coincidence event like:
-[[File:Cosmic coinc PS1 PS2 n.png | 800px]]
+The scope pictures of coincidence events looks like:
-The ratio of  (PS+PS2) rate to (PS+PS2+n's) rate is
+{| border="0" cellspacing="0" style="text-align: center; width: 1050px; height: 100px;"
+! scope="col" width="50" |PS1+PS2 event looks like:
- <math>\frac{7.7}{4.9} = 1.6</math>
+! scope="col" width="50" |PS1+PS2+n event looks like:
+|-
+|[[File:Cosmic coinc PS1 PS2.png | 500px]] || [[File:Cosmic coinc PS1 PS2 n.png | 500px]]
+|}

Difference between revisions of "05/13/2011 coincidence test"

Latest revision as of 17:27, 16 May 2011

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