Difference between revisions of "05/12/2011 random coincidence cosmic test"

Revision as of 21:39, 12 May 2011

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.

PS1 and PS2 is about 30 cm away from each other. And let's look on the coincidence signal between PS1 and PS2:

	total counts	time	counts/min	counts/sec
PS1	[math]10247\pm101.2[/math]	70 min	[math]146.4\pm1.44[/math]	[math]2.44\pm0.02[/math]
PS1	[math]12969\pm113.9[/math]	70 min	[math]185.3\pm1.63[/math]	[math]3.09\pm0.03[/math]
PS1+PS2 (30 cm away)	[math]3\pm1.7[/math]	70 min	[math]0.043\pm0.024[/math]	[math]0.0007\pm0.0004[/math]

And below my scope pictures of this rear event:

Let's do the random coincidence cosmic ray test 2.

But now the distance between PS1 and PS2 is about 5 cm. And let's look on the coincidence signal between PS1 and PS2:

	total counts	time	counts/min	counts/sec
PS1	[math]\pm101.2[/math]	70 min	[math]146.4\pm1.44[/math]	[math]2.44\pm0.02[/math]
PS1	[math]\pm113.9[/math]	70 min	[math]185.3\pm1.63[/math]	[math]3.09\pm0.03[/math]
PS1+PS2 (5 cm away)	[math]\pm1.7[/math]	70 min	[math]0.043\pm0.024[/math]	[math]0.0007\pm0.0004[/math]

And below my scope pictures of this rear event:

@@ Line 35: / Line 35: @@
 |<math>12969\pm113.9</math>||70 min||<math>185.3\pm1.63</math>||<math>3.09\pm0.03</math>
 |-
-!PS1+PS2
+!PS1+PS2 (30 cm away)
 |<math>3\pm1.7</math>||70 min||<math>0.043\pm0.024</math>||<math>0.0007\pm0.0004</math>
 |}
@@ Line 61: / Line 61: @@
 |<math>\pm113.9</math>||70 min||<math>185.3\pm1.63</math>||<math>3.09\pm0.03</math>
 |-
-!PS1+PS2
+!PS1+PS2 (5 cm away)
 |<math>\pm1.7</math>||70 min||<math>0.043\pm0.024</math>||<math>0.0007\pm0.0004</math>
 |}