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ECRIS

Paper Title Other Keywords Page
MOP042 UNILAC Upgrades for Coulomb Barrier Energy Experiments ion, rfq, ECR, ion-source 148
 
  • L.A. Dahl, W.A. Barth, P. Gerhard, S. Mickat, W. Vinzenz, H. Vormann
    GSI, Darmstadt
  • A. Schempp, M. Vossberg
    IAP, Frankfurt am Main
 
 

The GSI linear accelerator UNILAC provides heavy ion beams at Coulomb barrier energies for search and study of super heavy elements. Typical cross-sections of 55 fb require beam doses of 1.4·1019 according to a beam time of 117 days. Several upgrades will reduce the beam time to only 16 days. A second injection branch with a 28GHz-MS-ECRIS anticipates a factor of 10 in particle intensity. By a new cw rfq-structure all accelerator tanks are suitable for a duty cycle of at least 50% instead of 25% presently. Due to this, thermal power increase of 19 rf-amplifiers eased by higher ion charge states of the ECRIS is necessary. Finally the UNILAC timing system controlling 50Hz pulse-to-pulse operation of up to six beams differing in ion species and energy has to be modified considering beam diagnostics electronics and pulsable magnets. The front end comprising ECRIS, rfq- and IH-structure is cw suitable and will serve as injector for a new future sc-cw-linac.

 
MOP060 The Compact Injector as the Second Injector of the HIMAC linac, ion, rfq, DTL 190
 
  • Y. Iwata, T. Fujisawa, T.M. Murakami, M. Muramatsu, K. Noda
    NIRS, Chiba-shi
  • Y.K. Kageyama, I. Kobayashi, T. Sasano, T. Takeuchi
    AEC, Chiba
 
 

A compact injector, consisting of the permanent-magnet ECR ion-source, the RFQ linac and the alternating-phase-focused interdigital H-mode drift-tube-linac (APF IH-DTL), was developed for an injector of medical-accelerator facilities, dedicated for the heavy-ion cancer therapy. The injector can accelerate heavy-ions having q/m=1/3 up to 4 MeV/u. Beam acceleration tests of the compact injector were successfully made at the National Institute of Radiological Sciences (NIRS), and the results of the acceleration tests proved its excellent performance*. The same design was used for the injector, constructed at the Heavy Ion Medical Center in the Gunma University. Our compact injector was recently installed in the HIMAC, and will be used as the second injector of the HIMAC. The new beam transport line for the compact injector was constructed in conjunction with the existing transport line. The entire injector system of the HIMAC accelerator complex will be presented.


* Y. Iwata, et al., Nucl. Instr. and Meth. in Phys. Res. A 572 (2009) 1007.