Difference between revisions of "05/10/2011"
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| − | |205||204||201.2||202.4||203.2 | + | |205||204||201.2||202.4||'''203.2''' |
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| − | Now I increased the power supply for HAMAMATSU PMT and adjusted the threshold | + | Now I increased the power supply for HAMAMATSU PMT (-1500 V) and adjusted the threshold (-500 mV). All other parameters are the same. |
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! 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" | counts/min ( | + | ! scope="col" width="50" | counts/min (1 min test) |
| − | ! scope="col" width="50" | counts/min ( | + | ! scope="col" width="50" | counts/min (1 min test) |
! scope="col" width="50" | avg counts/min | ! scope="col" width="50" | avg counts/min | ||
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!PS1 | !PS1 | ||
| − | | | + | |158||168||151||175||'''163''' |
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!PS2 | !PS2 | ||
| − | | | + | |194||166||162||176||'''174.5''' |
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!n's | !n's | ||
| − | | | + | |224||213||197||201||'''208.7''' |
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Revision as of 16:48, 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 are:
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 |
| 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 (-1500 V) and adjusted the threshold (-500 mV). All other parameters are the same.
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 (1 min test) | counts/min (1 min test) | avg counts/min | |
|---|---|---|---|---|---|
| PS1 | 158 | 168 | 151 | 175 | 163 |
| PS2 | 194 | 166 | 162 | 176 | 174.5 |
| n's | 224 | 213 | 197 | 201 | 208.7 |