Göttingen 2012 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 83: Beschleunigerphysik 5
T 83.9: Vortrag
Mittwoch, 29. Februar 2012, 18:50–19:05, VG 1.103
Tune measurements with high intensity ion beams at GSI SIS-18 — •Rahul Singh1,2, Peter Forck1, Piotr Kowina1, Wolfgang Kaufmann1, and Thomas Weiland2 — 1GSI, Planckstrasse 1, 64291 Darmstadt, Germany — 2TEMF, TU Darmstadt, Schlossgartenstr. 8, 64581 Darmstadt, Germany
A precise tune measurement during a full accelerating cycle is required to achieve stable high current operation. A new system has been commisioned at GSI for position, orbit and tune measurements. It consists of three distinct parts; An exciter which provides power to excite coherent betatron oscillations in the bunched beam; Fast ADCs to digitize the BPM signals at 125MSa/s; The post processing electronics uses digitized BPM signals to acquire one position value per bunch. Subsequently the baseband tune is determined by Fourier transformation of the position data.
Experiments were conducted to understand the effects of high beam intensity on tune at injection plateau (11.4 MeV/u) and during acceleration ramp (11.4-600 MeV/u). These experiments were performed with U73+ and Ar18+ ion beam at highest achievable intensities of 2·109 and 2.5 ·1010 respectively. Tune shift with increased intensity was observed. The working principle of the tune measurement system and observed high intensity effects on tune will be reported in this contribution.