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bunching

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MOP005 Beam Dynamics for Intense L-band Electron Linac electron, linac, simulation, focusing 37
 
  • S. H. Kim, M.-H. Cho, S.-I. Moon, W. Namkung, B. Park
    POSTECH, Pohang, Kyungbuk
  • J.-S. Oh
    PAL, Pohang, Kyungbuk
  We are now developing an intense L-band electron linac with a traveling-wave accelerating structure for irradiation applications. It is capable to produce 10 MeV electron beams of 30 kW by a pulsed klystron of 25 MW with a 60 kW average power. Bunching and accelerating cavities operated with 2π/3 mode at 1.3 GHz are designed by the SUPERFISH code. Focusing solenoids are designed by the POISSON code. Using electromagnetic field configurations obtained by these codes, a simulational study on the beam dynamics is conducted by the PARMELA code. As results, the beam envelope supports a transmission efficiency over 91% with the E-gun current of 1.6 A.  
 
MOP052 First Performance Test of an Integrated RFQ-Drifttube-Combination rfq, ion, simulation, proton 162
 
  • A. Bechtold, M. Otto, A. Schempp
    IAP, Frankfurt-am-Main
  In the frame of a collaboration with the GSI in Darmstadt an RFQ-Drifttube-Combination for the Heidelberg cancer therapy center HICAT has been designed, built and successfully beam tested at the IAP Frankfurt. The integration and combination of both an RFQ and a rebunching drifttube unit inside a common cavity forming one single resonant RF-structure has been realized for the first time with this machine. The results of the beam measurements and questions about the beam dynamics simulations have been investigated in detail with the code RFQSIM.  
 
TUP031 Beam Dynamics Studies on the ISAC-II Superconducting Linac linac, emittance, acceleration, diagnostics 312
 
  • M. Marchetto, A. Bylinskii, R. E. Laxdal
    TRIUMF, Vancouver
  The ISAC-II superconducting linac is presently in the beam commissioning phase. The linac lattice consists of modules of four quarter wave cavities and one superconducting solenoid. Beam steerers between cryomodules compensate for steering effects due to misalignments in the solenoids. Beam dynamics aspects of linac commissioning will be highlighted.  
 
THP035 Design on Accelerating Tube of High-Power Electron Linac for Irradiation Processing electron, linac, beam-losses, simulation 652
 
  • H. Liu, X. Wang
    CIAE, Beijing
  • S. Fu
    IHEP Beijing, Beijing
  There is an unstable phenomenon for high-power electron linacs for irradiation processing. The main source of the instability of this type of linac comes from the thermal effect of the accelerator tube under an intense heat load. If a lot of injected electrons are lost in the tube, they can cause an intense and uneven heat load on the tube that may deform the cavities of the accelerator tube and deviate the correct acceleration phase relationship. In this paper, a constant gradient accelerating structure is chosen to accelerate the electron beam, and the designed phase velocity is gradually increased along the tube. By adjusting the size of the accelerating cavities and the phase velocity function, a high capture-efficiency is reached. After a series of simulations studies, we obtained a 90% capture-efficiency, which minimizes the probability of the unstable phenomenon in the high power electron linac.