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HK: Fachverband Physik der Hadronen und Kerne

HK 46: Poster

HK 46.44: Poster

Thursday, March 20, 2014, 16:00–18:00, HZ Poster

Test of a non-invasive Bunch Shape Monitor at the GSI high current LINAC — •Benjamin Zwicker1,2, Christoph Dorn1, Peter Forck1,2, Oliver Kester1,2, and Piotr Kowina11GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany — 2Institut für Angewandte Physik, Goethe Universität Frankfurt, Germany

At the heavy ion LINAC at GSI, a novel scheme of non-invasive Bunch Shape Monitor has been tested with several ion beams at 11.4 MeV/u. Caused by the beam impact on the residual gas, secondary electrons are liberated. These electrons are accelerated by an electrostatic field, transported through a sophisticated electrostatic energy analyzer and an rf-deflector, acting as a time-to-space converter. Finally a MCP detects the electron distribution. For the applied beam settings this Bunch Shape Monitor is able to obtain longitudinal profiles down to 400 ps with a resolution of 50 ps, corresponding to 2 degree of the 36 MHz acceleration frequency. During a long shutdown period for the GSI accelerators in 2013, the monitor underwent a general technical retrofit: Influence of the beam has been significantly reduced, due enhanced electrodes, new apertures have been installed to decrease electron scattering, sophisticated stepping motors will allow better image properties, a MCP shielding plate will prevent high background.

Together with these improvements the achievements of the monitor are discussed.

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