...
- The geometry of the PS setup actually used is described very well by Stefan here
- Other setups are in progress.
- The requirements come from the following list:
Photon runs
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2 cerenkov
1 large plastic (1cm thick) for rate monitoring
2 finger counters (2mm thickness, overlap of 1x1cm) for triggering
1 large plastic (1cm thick) with a 24mm diameter hole centered on the
beam for vetoing background
2 XY silicon layers before the magnet
1 magnet
2 XY silicon layers after the magnet
1 plastic (1cm thick) after the last silicon for triggering
...
...
comment: we might deplete the 2nd cerenkov to reduce X0 if we realize
that the photon trigger is efficient
Electron runs
--------------
...
...
2 cerenkov
...
1 large plastic (1cm thick) for rate monitoring
...
2 finger counters (2mm thickness, overlap of 1x1cm) for triggering
...
1 large plastic (1cm thick) with a 24mm diameter hole centered on the
...
beam for vetoing background
...
1 XY silicon layers before the magnet
...
1 magnet OFF
comment: we might need a trigger scintillator in coincidence with the
fingers just before the CU
Positron
...
runs
--------------
2 cerenkov
1 large plastic (1cm thick) for rate monitoring
2 finger counters (2mm thickness, overlap of 1x1cm) for triggering
1 large plastic (1cm thick) with a 24mm diameter hole centered on the
beam for vetoing background
1 XY silicon layers before the magnet
1 magnet ON
1 EM CAL (40cm NaI) to veto gammas
1 plastic after the annihilator before the CU to veto electron/positron Proton Runs*
Proton runs
--------------
2 cerenkov
1 large plastic (1cm thick) for rate monitoring
2 finger counters (2mm thickness, overlap of 1x1cm) for triggering
1 large plastic (1cm thick) with a 24mm diameter hole centered on the
beam for vetoing background
1 XY silicon layers before the magnet
1 magnet OFF
comment: we might need a trigger scintillator in coincidence with the
fingers just before the CU
general comment: the veto counter (plastic with hole) might be removed
if background is measured to be low enough