Difference between revisions of "05/10/2011"
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Now I increased the power supply for HAMAMATSU PMT (-1500 V) and adjusted the threshold (-500 mV). All other parameters are the same. | Now I increased the power supply for HAMAMATSU PMT (-1500 V) and adjusted the threshold (-500 mV). All other parameters are the same. | ||
| − | + | 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;" | {| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;" | ||
! scope="col" width="50" | | ! scope="col" width="50" | | ||
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!n's | !n's | ||
|224||213||197||201||'''208.7''' | |224||213||197||201||'''208.7''' | ||
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| + | Now 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 | ||
| + | | | ||
| + | |- | ||
| + | !PS2 | ||
| + | | | ||
| + | |- | ||
| + | !n's | ||
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|} | |} | ||
Revision as of 16:49, 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.
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 |
Now the CF-243 source is on the top of PS1:
| counts/min (1 min test) | counts/min (1 min test) | counts/min (1 min test) | counts/min (1 min test) | avg counts/min | |
|---|---|---|---|---|---|
| PS1 | |||||
| PS2 | |||||
| n's |