PS instrumentation studies

1. Decided what magnet to use: 2 m long 30D72 magnet with the maximum field of 2 T.
2. The vaccum chamber design has to be optimized. The current length of the VC is 1.5 m.
3. Consider symmetric detectors covering the energy range from 3 GeV to 6 GeV.

Detector width (position from the beamline) as a function of the magnetic field:

For the magnetic field of 1.5 T the detector width should be about 30 cm.

Contribution to the position/energy resolution from multiple scattering. The converter is placed 1 m in front of the magnet. B = 1 T.

(the energy resolution of the scintillator counters corresponding to the default design is 12 MeV for 24 counters and 17 MeV for 8 counters).

1. Impact of the beam profile distribution and beam motion on the energy resolution

Relative shift of measured photon energy for the beam displacement of delta x = 2.5 mm. The magnetic field is set to 1 T.

Almost no bias of the measured photon energy is expected for E(e)/E(gamma) = 0.5.

Appropreate E(e)/E(gamma) range can be selected for the needed precision of the beam flux measurement.

1. Counter Rates