GEM-based beam profile monitors for the antiproton decelerator

Details GEM-based beam profile monitors for the antiproton decelerator GEM-based beam profile monitors for the antiproton decelerator

2011-11-15

arxiv.org/abs/1111.3394v1

2012 JINST 7 C03001

Physics

Instrumentation and Detectors

Presented at the second Micropattern Gaseous Detector conference 2011 (MPGD2011), Agust 2011, Kobe, Japan

Scientific paper

10.1088/1748-0221/7/03/C03001

The new beam profile measurement for the Antiproton Decelerator (AD) at CERN is based on a single Gas Electron Multiplier (GEM) with a 2D readout structure. This detector is very light, ~0.4% X0, as required by the low energy of the antiprotons, 5.3 MeV. This overcomes the problems previously encountered with multi-wire proportional chambers (MWPC) for the same purpose, where beam interactions with the detector severely affect the obtained profiles. A prototype was installed and successfully tested in late 2010, with another five detectors now installed in the ASACUSA and AEGIS beam lines. We will provide a detailed description of the detector and discuss the results obtained. The success of these detectors in the AD makes GEM-based detectors likely candidates for upgrade of the beam profile monitors in all experimental areas at CERN. The various types of MWPC currently in use are aging and becoming increasingly difficult to maintain.

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