Difference between revisions of "05/10/2011"
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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 to the new 2 channel one C.A.E.N N471 | ||
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The powers are: | The powers are: | ||
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PS1 and PS2: -80 mV | PS1 and PS2: -80 mV | ||
n's: -60 mV | n's: -60 mV | ||
| − | |||
| Line 46: | Line 44: | ||
Interesting. The same power for HAMAMATSU PMT, but different counts result. | Interesting. The same power for HAMAMATSU PMT, but different counts result. | ||
| + | |||
| + | |||
| + | |||
| + | Now I increased the power supply for HAMAMATSU PMT and adjusted the threshold. | ||
| + | |||
| + | The powers are: | ||
| + | |||
| + | PS1 and PS2: -1000 V (the old 2-channel TENNELEC TC952) | ||
| + | n's: -1500 V (the new 2-channel C.A.E.N N471) | ||
| + | |||
| + | |||
| + | The thresholds were: | ||
| + | |||
| + | PS1 and PS2: -80 mV | ||
| + | n's: -500 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 | ||
| + | |187||160||166||160.8||168.4 | ||
| + | |- | ||
| + | !PS2 | ||
| + | |187||170||180.4||184.4||180.4 | ||
| + | |- | ||
| + | !PS1+PS2 | ||
| + | | | ||
| + | |- | ||
| + | !n's | ||
| + | |205||204||201.2||202.4||203.2 | ||
| + | |} | ||
Revision as of 16:36, 10 May 2011
continue...the same set up as before, the distances are the same:
First I change the power supply for HAMAMATSU PMT to the new 2 channel one C.A.E.N N471
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 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):
| counts/min (1 min test) | counts/min (1 min test) | counts/min (5 min test) | counts/min (5 min test) | avg counts/min | |
|---|---|---|---|---|---|
| PS1 | 187 | 160 | 166 | 160.8 | 168.4 |
| PS2 | 187 | 170 | 180.4 | 184.4 | 180.4 |
| PS1+PS2 | |||||
| n's | 205 | 204 | 201.2 | 202.4 | 203.2 |
Interesting. The same power for HAMAMATSU PMT, but different counts result.
Now I increased the power supply for HAMAMATSU PMT and adjusted the threshold.
The powers are:
PS1 and PS2: -1000 V (the old 2-channel TENNELEC TC952) n's: -1500 V (the new 2-channel C.A.E.N N471)
The thresholds were:
PS1 and PS2: -80 mV n's: -500 mV
Let see what we have. First he CF-243 source is far far away (sealed in the safe):
| counts/min (1 min test) | counts/min (1 min test) | counts/min (5 min test) | counts/min (5 min test) | avg counts/min | |
|---|---|---|---|---|---|
| PS1 | 187 | 160 | 166 | 160.8 | 168.4 |
| PS2 | 187 | 170 | 180.4 | 184.4 | 180.4 |
| PS1+PS2 | |||||
| n's | 205 | 204 | 201.2 | 202.4 | 203.2 |