# 05/12/2011

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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**.

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 | 70 min | |||

PS1 | 70 min | |||

PS1+PS2 | 70 min |

And below my scope pictures of this rear event:

Let's do the **random coincidence cosmic ray test** again.

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 | 70 min | |||

PS1 | 70 min | |||

PS1+PS2 | 70 min |

Let's do the **2n correlation test** with CF252 source. The voltages and thresholds are the same.
First the set up is like:

- PS1 and PS2 are parallel to each other and are faced to the source.
- the CF252 source in the middle
- the distance between PS1(PS2) and source is 6 cm

The total number of events (2n fission events + random coincident) are:

total counts | time | counts/min | counts/sec | |
---|---|---|---|---|

PS1 | 10 min | |||

PS1 | 10 min | |||

PS1+PS2 | 10 min |

Second the set up is like:

- PS1 and PS2 are perpendicular to each other and are faced to the source.
- the CF252 source in the middle
- the distance between PS1(PS2) and source is 6 cm

The total number of events (2n fission events + random coincident) are:

total counts | time | counts/min | counts/sec | |
---|---|---|---|---|

PS1 | 10 min | |||

PS1 | 10 min | |||

PS1+PS2 | 10 min |