| Paper |
Title |
Page |
| TUPLT027 |
Status of the HITRAP Decelerator Linac at GSI
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1201 |
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- C.A. Kitegi, A. Bechtold, U. Ratzinger, A. Schempp
IAP, Frankfurt-am-Main
- T. Beier, L. Dahl, C. Kozhuharov, W. Quint, M. Steck
GSI, Darmstadt
- S. Minaev
ITEP, Moscow
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Within the European Network HITRAP (heavy Ion trap) trapped and cooled higly charged ions up to U92+ will become avilable for a variety of attractive experiments in atomic physics. Heavy ions are produced, accelerated and stripped in the GSI accelerator complex and are stored in the ESR down to 4 MeV/u. To be captured in HITRAP, ions have to be decelerated to energies below 6 keV/u. The decelerator proposed to achieve these energies is a combination of an IH Drift tube cavity operating in the H11(0) mode and a RFQ. The operating frequency is 108.408MHz . The A/q range of the linac is up to 3. A very efficient deceleration by up to 11 MV along the 2.7 m long IH cavity with a rf power of 200kw is achieved by applying the KONUS beam dynamics. The deceleration from 500 A.keV down 6A.keV is provided by a 1.8 m long 4-rod RFQ.The beam dynamics as well as the cavity design of that linac will be described.The decelerator linac will be installed in the reinjection beam line and is being developed in collaboration between GSI and the Frankfurt University .
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| WEPLT052 |
A Method to Measure the Skew Quadrupole Strengths in the SIS-18 using Two BPMs
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1954 |
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- F. Franchi, T. Beier, M. Kirk, M. Moritz, G. Rumolo
GSI, Darmstadt
- R. Tomas
BNL, Upton, Long Island, New York
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In the SIS-18 of GSI a new set of skew quadrupoles has been installed to improve the multi-turn-injection. A new method based on the measurement of the resonance driving terms has been proposed to cross-check the nominal values and polarities of their gradients. Once a beam is transversely kicked, it experiences oscillations whose spectrum contains both the betatron tune line and secondary lines. The amplitude of each line is proportional to the strength of the multipoles, such as skew quadrupoles and sextupoles, present in the lattice. In this paper a recursive algorithm to derive the magnet strength from the spectral lines and the application of this method to the eight skew quadrupoles in the SIS-18 are presented.
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