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Schmidt, J.S.

Paper Title Page
MOPD034 Beam measurements at the Frankfurt Funneling Experiment 759
 
  • N. Mueller, U. Bartz, M. Baschke, A. Schempp, J.S. Schmidt
    IAP, Frankfurt am Main
  
 

Funneling is a method to increase low energy beam currents in multiple stages. The Frankfurt Funneling Experiment is a model of such a stage. The experiment is built up of two ion sources with electrostatic lens systems, a Two-Beam-RFQ accelerator, a funneling deflector and a beam diagnostic system. The two beams are bunched and accelerated in a Two-Beam RFQ. A funneling deflector combines the bunches to a common beam axis. Current work is beam tests with the new beam matching section. First funneling beam and energy measurements with the improved Two-Beam-RFQ will be presented.

  
MOPD035 Tuning of the 4-rod RFQ for MSU 762
 
  • J.S. Schmidt, J.M. Maus, N. Mueller, A. Schempp
    IAP, Frankfurt am Main
  • J. Haeuser
    Kress GmbH, Biebergemuend
  • O.K. Kester
    NSCL, East Lansing, Michigan
  
 

A new reaccelerator facility ReA3 is currently under construction for National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University (MSU). As part of that project a new 3.5 m long 4-rod Radio Frequency Quadrupole (RFQ) has been build. This RFQ accelerates ions with a Q/A ratio of 0.2 up to 0.5 from an input energy of 12 keV/u to the final energy of 600 keV/u. We have designed the 80.5 MHz-RFQ with a square cavity cross section. It was build and tuned in Frankfurt and has been delivered to MSU. The design and the tuning process of the ReA3-RFQ will be discribed in this paper.

  
MOPD036 Simulations of Buncher-cavities with Large Apertures 765
 
  • P.L. Till, P. Kolb, A. Schempp, J.S. Schmidt, M. Vossberg
    IAP, Frankfurt am Main
  
 

Buncher-cavities re-accelerate, bunch or re-bunch particle beams. A special form of these buncher-rf-cavities is a spiral-structure. Two different spiral resonators were simulated and build for the new EBIS LINAC at Brookhaven National Laboratory. These buncher-cavities have a remarkably large aperture of 100 mm. To optimize the cavities to the BNL-frequency of 100 MHz, simulations have been carried out. The impact of changing the gap width, drifttube-, and spiral arm-length on the design of the spiral cavities, has been analyzed. Results of simulations and measurement will be presented.