| Paper |
Title |
Page |
| FPAE070 |
A Collimation Scheme for Ions Changing Charge State in the LEIR Ring
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3816 |
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- J. Pasternak, C.B. Bal, C. Carli, M. Chanel, E. Mahner
CERN, Geneva
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Avalanche-like pressure rise and an associated decrease of the beam lifetime, caused by (i) beam loss due to charge exchange interactions with rest gas molecules and (ii) ion impact induced outgassing, is a potential limitation for heavy ion accelerators operating at low energy. Capture of electrons from the electron cooler is another source of ion losses and thus, of pressure rise. The vacuum system of the LEIR ring has to be upgraded to reach the dynamical vacuum pressure in the low 10-12 Torr range necessary to reach design performance. A collimation system to intercept lost ions by absorber blocksmade of low beam induced outgassing material will be installed. This paper reviews the collimation scheme and simulations of beam loss patterns around the ring.
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