ALPHA SOURCE RUN

First part : forward rings :

1) Install the alpha source on the INDRA target holder and put it in "beam position", the active face forward (looking at rings 1-13)

2) Turn off all the CsI.

3) In the "Selecteur" panel :

• Set the "Selecteur" to "Mode physique" (Mode physique in green, Generateur and MRQ soft in red).
• Set the Multiplicity >= 1 in "Declenchement physique"

4) Start the acquisition.

5) Due to the difference of solid angle size between the rings, ring 8-9 will trigger the acquisition more often than for example ring 1. To balance the statistic, turn of the ring 8-9 when the number of counts is high enough. Then latter on, when the ring 6-7 has also a good statistic, turn it off too. And so on until ring 1.

6) Turn on CsI 10-12 and ring 10-11 and 12-13.

7) Stop the acquisition.

Second part (backwards rings) :

1) Start the acquisition.

2) Turn on all the CsI

3) Turn the alpha source of 180 degres to the backward angles.

4) Do in the same way than for the forward rings (after a while, turn off the rings 13, then the ring 14-15).

5) Stop the acquisition.

David Gourio