| Paper |
Title |
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| TU3001 |
High-Current Proton Beam Investigations at the SILHI-LEBT at CEA/Saclay
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232 |
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- R. Hollinger, W. Barth, L. A. Dahl, M. Galonska, L. Groening, P. S. Spaedtke
GSI, Darmstadt
- R. Gobin, P.-A. Leroy
CEA, Gif-sur-Yvette
- O. Meusel
IAP, Frankfurt-am-Main
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For the injection of a high current proton beam into the future proton LINAC at GSI for FAIR the ion source and the low energy beam transport system have to deliver a 100 mA proton beam with an energy of 95 keV within an acceptance of 0.3 mm mrad (normalized, rms) at the entrance of the RFQ. Besides the ion source a 2-solenoid focusing system is foreseen as an injection scheme for the subsequent RFQ. The beam parameters of the SILHI ion source and the 2-solenoid LEBT setup generally meet these requirements. Therefore joint emittance measurements on various beam parameters have been performed at the end of the LEBT system. In the frame work of the design study for the future proton LINAC it was a unique possibility to investigate the injection of a high current proton beam into a low energy beam transport system under the influence of space charge. The measurements reveal that a proton current of 100 mA can be achieved at the end of the LEBT while the emittance (95 %, rms, normalized) is as high as 0.3 to 0.5 mm mrad.
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| TUP089 |
Computer Simulations of a High-Current Proton Beam at the SILHI-LEBT
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469 |
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- M. Galonska, M. Galonska
IAP, Frankfurt-am-Main
- R. Gobin
CEA, Gif-sur-Yvette
- R. Hollinger
GSI, Darmstadt
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For the injection of a proton beam into the future proton LINAC for FAIR the ion source and the low energy beam transport system have to deliver a 100 mA proton beam with an energy of 95 keV at the entrance of the RFQ within an acceptance of 0.3 π mm mrad (normalized, rms). A 2-solenoid focusing system is foreseen as an injection scheme. The beam parameters of the SILHI ion source and the 2-solenoid LEBT setup at CEA/Saclay fulfill these requirements. Therefore joint emittance measurements on various beam parameters have been performed at the end of 2005. This article presents the computer simulations of the ion source extraction and LEBT, which supplemented these measurements using the KOBRA3-INP computer code in order to study the influence of space charge effects. These simulations have been performed for various solenoid settings and for different space charge compensation degrees clearly revealing that the ion beam transport within the LEBT is influenced by space charge forces.
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| THP089 |
Testbench of the HICAT RFQ at GSI
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791 |
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- C. M. Kleffner, R. Baer, W. Barth, M. Galonska, F. Heymach, R. Hollinger, G. Hutter, W. Kaufmann, M. T. Maier, A. Reiter, B. Schlitt, M. Schwickert, P. S. Spaedtke, W. Vinzenz
GSI, Darmstadt
- A. Bechtold, A. Schempp
IAP, Frankfurt-am-Main
- R. Cee, E. Feldmeier, S. Vollmer
HIT, Heidelberg
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In April 2006 the commissioning of the ion linac for the HICAT therapy facility in Heidelberg, Germany was started. In preparation of this commissioning process beam tests of the RFQ cavity with protons were carried out at GSI. The RFQ cavity for the HICAT facility was delivered to GSI in March 2005. The operation with an rf power up to 200 kW and a pulse width of 500 μsec could be accomplished successfully after a short time of rf-conditioning to assure the operation mode with carbon ions. A testbench for the RFQ cavity was constructed at GSI to allow for exact measurements of the output energy with the time of flight (ToF) method in addition to the beam tests at IAP Frankfurt. Due to the fact that the rebuncher is fully integrated into the RFQ rf-structure beam studies with different mechanical settings of the rebuncher had to be conducted. For each setting the effective voltage of the rebuncher could be estimated. The final mechanical setting was chosen with respect to required longitudinal matching to the IH structure behind of the RFQ.
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