Keyword: DTL
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MOPG43 Beam Tuning for Longitudinal Profile at J-PARC Linac emittance, linac, resonance, quadrupole 150
  • A. Miura
    JAEA/J-PARC, Tokai-mura, Japan
  • Y. Liu, T. Maruta
    KEK/JAEA, Ibaraki-Ken, Japan
  • T. Miyao
    KEK, Ibaraki, Japan
  Using bunch shape monitors (BSMs), we measured the longitudinal bunch lengths of negative hydrogen ion beams in the J-PARC linac. A BSM was installed between two linacs, separate-type drift tube linac (SDTL) and an annular-ring-coupled structure linac (ACS), having acceleration frequencies of 324 and 972 MHz, respectively. We used radio-frequency amplitude modulation of bunches in the beam transport between the SDTL and ACS to minimize emittance growth and beam loss. We conducted amplitude scanning and compared the results with the twiss-parameters obtained from the transverse profiles. In this paper, we discuss the results of amplitude tuning of the buncher cavity at the point of beam loss and emittance. We also discuss the measurement results for various equipartitioning settings of quadrupole magnets.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG43  
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WEPG29 Commissioning Results of the TOP-IMPLART 27 MeV Proton Linear Accelerator proton, linac, booster, rfq 686
  • P. Nenzi, A. Ampollini, G. Bazzano, L. Picardi, M. Piccinini, C. Ronsivalle, V. Surrenti, E. Trinca, M. Vadrucci
    ENEA C.R. Frascati, Frascati (Roma), Italy
  Funding: The work has been granted by Regione Lazio under the agreement "TOP-IMPLART Project"
The results of a 27MeV proton LINAC commissioning are presented. The linac, operating at ENEA Frascati Research Center, consists of a 425MHz injector followed by a 3GHz booster. The injector is a commercial LINAC (ACCSYS-HITACHI PL7) composed by a duoplasmatron source with einzel lens, a 3MeV RFQ and a 7MeV DTL. Wide injection current range (0-1.5mA) is obtained varying extraction and lens potentials. The booster is a sequence of 3 SCDTL (Side Coupled DTL) modules with output energies of 11.6, 18 and 27MeV. Each module requires less than 2MW peak power in 4us length pulses. All modules are powered by a single klystron. The output beam has been characterized at 10Hz PRF. Fast AC transformers, Faraday cup and ionization chamber have been used for current/charge monitoring, while energy has been measured using a novel detector based on LiF crystals. Systematic measurements have been done to investigate the sensitivity of output beam to machine operating parameters (SCDTL temperatures, stability of injector and RF power) highlightning the existing correlations. The LINAC is part of a 150MeV protontherapy accelerator under development in the framework of the TOP-IMPLART Project.
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG29  
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