CERN Accelerating science

Published Articles
Report number	CERN-ACC-2019-164
Title	RFQ electrodes change and upgrade option at the UNILAC HSI injector
Author(s)	Vossberg, Markus (Darmstadt, GSI) ; Bencini, Vittorio (CERN) ; Garland, James (CERN) ; Gerhard, Peter (Darmstadt, GSI) ; Groening, Lars (Darmstadt, GSI) ; Lallement, Jean-Baptiste (CERN) ; Lombardi, Alessandra (CERN) ; Mickat, Sascha (Darmstadt, GSI) ; Vormann, Hartmut (Darmstadt, GSI) ; Xiao, Chen (Darmstadt, GSI)
Publication	2019
Number of pages	4
In:	10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPTS036
DOI	10.18429/JACoW-IPAC2019-MOPTS036
Subject category	Accelerators and Storage Rings
Abstract	In order to meet the beam intensity and quality requirements imposed by FAIR, the HSI-RFQ beam dynamics originally dating from 2009 has been re-designed recently at CERN. Front-to-end simulations demonstrated that the new design meets the FAIR targets. Implementation of the new electrodes, initially planned for 2019, will require readaption of the RFQ cavity RF-parameters by re-shaping the stems that keep the electrodes. However, during the beam time 2018 the existing RFQ did not reach its nominal voltage, most likely due to expired lifetime of the electrodes originating from 2009. In order to shorten the RFQ maintenance period and to minimize any risk for upcoming beam time 2019, it was decided to post-pone the implementation of the new design and rather just re-producing the 2009 design electrodes. This contribution is on the reproduction process as short-term solution and on the full implementation of the new design as mid-term solution. CST simulations performed at GSI assure that the resonance frequency with the new electrode geometry is recuperated through corrections of the carrier rings. The status of the exchange of the electrodes and simulations for the adaptation of the new electrode design are presented.
Copyright/License	Publication: (License: CC-BY-3.0)

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