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HK: Fachverband Physik der Hadronen und Kerne

HK 46: Poster

HK 46.48: Poster

Donnerstag, 20. März 2014, 16:00–18:00, HZ Poster

Experimental Results of an ExB Chopper System — •Christoph Wiesner, Hannes Dinter, Martin Droba, Oliver Meusel, Daniel Noll, Tobias Nowottnick, Onur Payir, Ulrich Ratzinger, and Philipp Schneider — IAP, Goethe-Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt am Main

A new chopper system for low-energy high-perveance beams and high repetition rates was developed for the Low Energy Beam Transport (LEBT) section of the accelerator-driven neutron source FRANZ [1]. The chopper combines a static magnetic deflection field with a pulsed electric compensation field in a Wien filter-type ExB configuration [2]. The total system length is 80 cm.

Successful beam operation of the chopper has started. Helium beams with 14 keV energy were chopped with the required repetition rate of 257 kHz. The beam pulses have rise times of 120 ns and Full Width at Half Maximum (FWHM) of 240 ns to 370 ns. When the future high-current proton source of the FRANZ facility is available, the chopper will operate with a 50 mA, 120 keV beam. The design of the chopper and results of beam experiments are presented.

[1] U. Ratzinger et al., Proc. of IPAC2011, San Sebastian, Spain, WEPS040.

[2] C. Wiesner et al., Proc. of IPAC2012, New Orleans, LA., USA, THPPP074.