Abstract
Two target stations in the 590 MeV proton beamline of the High Intensity Proton Accelerator (HIPA) at the Paul Scherrer Institut (PSI) produce pions and muons for seven secondary beamlines, leading to several experimental stations. The two target stations are 18 m apart. Target M is a graphite target with an effective thickness of 5 mm, Target E is a graphite wheel with a thickness of 40 mm or 60 mm. Due to the spreading of the beam in the thick target, a high power collimator system is needed to shape the beam for further transport. The beam is then transported to either the SINQ target, a neutron spallation source, or stopped in the beam dump, where about 450 kW beam power is dissipated. Targets, collimators and beam dumps are described.
Highlights
The High Intensity Proton Accelerator (HIPA) at Paul Scherrer Institut (PSI) [1] delivers a 590 MeV continuous proton beam of up to 2.4 mA, which is accelerated in three stages and described in [2]
After the Ring cyclotron, the proton beam is sent to the two meson production target stations, M and E 1 [3]
As the Meson Production Target stations have to provide good transmission to the SINQ spallation target, losses due to multiple scattering and nuclear reactions in the targets have to be kept low while keeping the pion/muon yield high
Summary
The High Intensity Proton Accelerator (HIPA) at PSI [1] delivers a 590 MeV continuous proton beam of up to 2.4 mA, which is accelerated in three stages and described in [2] (of this proceedings). After the Ring cyclotron, the proton beam is sent to the two meson production target stations, M and E 1 [3]. As the Meson Production Target stations have to provide good transmission to the SINQ spallation target, losses due to multiple scattering and nuclear reactions in the targets have to be kept low while keeping the pion/muon yield high. In the 1980’s, beryllium was used, which failed after a short time at above 120 μA due to bending stresses on the location of a crack [5]. Another reason for abandon this material was the poisonous and radioactive Be contamination of the surrounding vacuum chamber walls. Special measures for maintenance have to be considered and provided
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