Beams Document 4064-v2

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Multi-Turn Stripping Injection and Foil Heating with Application to Project X

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Igor L. Rakhno
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Igor L. Rakhno
Document Created:
08 Feb 2012, 17:21
Contents Revised:
09 Feb 2012, 13:03
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11 Feb 2012, 07:04
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08 Feb 2012, 17:24
Stripping injection of negative hydrogen ions into the Fermilab recycler ring, combined with a beam phase painting technique, has been considered. The multiparticle 3D beam dynamics with space charge have been studied numerically, using STRUCT and ORBIT codes, for different painting scenarios. In order to achieve a uniform (quasi-KV) phase-space distribution and to reduce the foil heating, the following parameters were investigated: the number of turns, strengths and temporal forms of kicker magnets, and foil geometry. Performance of the stripping foil is a crucial parameter of the whole injection scheme, so that the latter has been designed to minimize the hit number on the foil. The temperature regime has been evaluated both semianalytically and numerically using Monte Carlo codes MARS and MCNPX, with radiation cooling and transport of delta-electrons taken into account. That all results agreed well proves the consistency of the models. It has been shown that the stripping foil can survive during injection with the parameters chosen for Project X at Fermilab.
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