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Efficient Positron Annihilation Setup for Particle Sampling Optimization

Updated geometry enhances particle detection with direct beam and deflected positrons setups. Triggering and vetoing mechanisms are optimized for event recordings. Thicker annihilation slab and higher running rate possibilities explored for improved results.

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Efficient Positron Annihilation Setup for Particle Sampling Optimization

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  1. First look at positron-annihilationsetup • Geometry updated + more efficient sampling of particles traversing the trigger detector (efficiency 50% now) • Compared two setups: • one with the direct beam in the detector • one with positrons deflected by the magnet • Triggering on plastic 0 and 1 and vetoing using plastic 2 behind annihilator • In real life, events without veto (downscaled) will be recorded for normalization purpose • 12 cm (4 layers) of annihilator blanket

  2. dump CU magnet magnet Cerenkov 1 Cerenkov 2 Trigger det. veto “Annihilator”

  3. Energy of highest energy gamma-ray Sum of two gamma-ray energies black: positrons red: electrons Important background from bremsstrahlung (2/3 of events): the radiating electron is left with very little energy and is stopped within annihilator or misses the veto.

  4. - magnet on • dump in • condition on position

  5. Energy of highest energy gamma-ray Sum of two gamma-ray energies black: positrons red: electrons 140 events (out of 250 000) pass the cuts: probability: ~ 6 10-4 Possibility of using a thicker “annihilator” slab (Al for instance) Possibility of running at high rate (1-2 kHz), limitation arises from pile-up in CsI pulses We will have to run with and without annihilator to estimate the background.

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