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| WEPPP10 |
Implementation of the DYNAMION Code to the End-To-End Beam Dynamics Simulations for the GSI Proton and Heavy Ion Linear Accelerators
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simulation, linac, ion, emittance |
201 |
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- S. Yaramyshev, W. Barth, L. A. Dahl, L. Groening, B. Schlitt
GSI, Darmstadt
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The advanced multi-particle code DYNAMION is sufficient to calculate beam dynamics in linear accelerators and transport lines under space charge conditions with high accuracy. Special features like the consideration of field measurements, misalignment and fabrication errors, and data from the real topology of RFQ electrodes, drift tubes, quadrupole lenses lead to reliable results of the beam dynamics simulations. End-to-end simulations for the whole linac (from ion source extraction to the synchrotron entrance) allow for the investigation and optimization of the overall machine performance as well as for the calculation of the expected impact of different upgrade measures, proposed to improve beam brilliance. Recently the DYNAMION code is applied to investigate the beam dynamics for the different GSI-linacs: the heavy ion high current UNILAC, the high current proton linac for the future Facility for Antiproton and Ion Research at Darmstadt (FAIR), and the light ion accelerator for the cancer therapy (HICAT), to be commissioned in Heidelberg (Germany) in the near future. Recent results of the beam dynamics simulations by means of the DYNAMION code are presented. The proposed upgrade measures as well as tuning and optimization of the linacs are discussed.
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| WEPPP11 |
Comparison of the Beam Dynamics Designs for the FAIR High Current Proton LINAC-RFQ
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emittance, proton, linac, simulation |
205 |
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- S. Yaramyshev, W. Barth, L. A. Dahl, L. Groening
GSI, Darmstadt
- A. P. Durkin
MRTI RAS, Moscow
- S. Minaev
ITEP, Moscow
- A. Schempp
IAP, Frankfurt-am-Main
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The antiproton physics program for future Facility for Antiproton and Ion Research (FAIR) at Darmstadt is based on a rate of 7·1010 cooled antiprotons per hour. To provide sufficient primary proton intensities a new proton linac is planned. The proposed linac comprises an Electron Cyclotron Resonance (ECR) proton source, a Radio Frequency Quadrupole (RFQ), and Crossed-bar H-cavities (CH). Its operation frequency of 352 MHz allows for an efficient acceleration to up to 70 MeV using normal conducting CH-DTLs. The beam pulses with a length of 32 mks, a current of 70 mA, and total transverse emittances of 7 mkm will allow to fill the existing GSI synchrotron SIS 18 within one multi-turn-injection up to its space charge limit of 7·1012 protons. Conceptual RFQ designs for two different RFQ types are proposed simultaneously: an RFQ of 4-rod type from the University Frankfurt and a 4 windows type RFQ from Institute for Theoretical and Experimental Physics (ITEP) and Moscow Radio-Technical Institute (MRTI). Studies of the beam dynamics in both RFQs has been done with the versatile multi-particle code DYNAMION. The topology of the RFQ tanks and electrodes is used "as to be fabricated" to provide for the realistic calculations of the external electrical field. The simulations are done under space charge conditions and including influence of the possible misalignments and errors of the fabrication. Simulated results for both designs will be discussed, as well as pros and cons. A comparison of the DYNAMION results with the simulations done by means of the PARMTEQM and LIDOS (dedicated codes for an RFQ design) is presented.
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