Author: Aoki, T.
Paper Title Page
MOPC020 Development of an S-band Multi-cell Accelerating Cavity for RF Gun and Booster Linac 110
 
  • T. Aoki, K. Sakaue, M. Washio
    RISE, Tokyo, Japan
  • A. Deshpande
    SAMEER, Mumbai, India
  • M.K. Fukuda, N.K. Kudo, T. Takatomi, N. Terunuma, J. Urakawa
    KEK, Ibaraki, Japan
  
  Funding: Work supported by JST Quantum Beam Program
We have been de­vel­op­ing a pho­to­cath­ode rf gun. The rf gun with multi cell can pro­duce a high en­er­gy elec­tron beam, so it may be used for nu­mer­ous ap­pli­ca­tions such as medicine and in­dus­try. At Laser Un­du­la­tor Com­pact X-ray source (LUCX), we have de­vel­oped a com­pact X-ray source based on in­verse Comp­ton scat­ter­ing. Using a multi cell rf gun will make pos­si­ble for the X-ray source to use for such ap­pli­ca­tions. S-band 3.5 cell rf elec­tron gun which is 20 cm long can pro­duce more than 10 MeV elec­tron beam. Ac­cord­ing to the sim­u­la­tion, it is said that the emit­tance of 3.5 cell rf gun is as low as that of 1.6 cell rf gun. The elec­tro­mag­net­ic de­sign has been per­formed with the code Su­per­Fish, and the par­ti­cle trac­ing by Parmela. The new rf gun is al­ready in­stalled and pro­duced a high qual­i­ty elec­tron beam with en­er­gy of more than 10 MeV. As a con­se­quence of the sub­stan­tial ef­forts of de­vel­op­ing rf cav­i­ty, we de­cide to make a com­pact RF ac­cel­er­at­ing struc­ture with more cell for achiev­ing a small­er sys­tem. The mea­sure­ment re­sults of using the 3.5 cell rf gun, the de­sign of 12 cell boost­er cav­i­ty, and cur­rent sta­tus of 12 cell cav­i­ty man­u­fac­tur­ing will be pre­sent­ed at the con­fer­ence. 		 
 
TUPC059 Study on Energy Compensation by RF Amplitude Modulation for High Intense Electron Beam Generated by a Photocathode RF-Gun 1132
 
  • Y. Yokoyama, T. Aoki, K. Sakaue, T. Suzuki, M. Washio, T. Yamamoto
    RISE, Tokyo, Japan
  • H. Hayano, N. Terunuma, J. Urakawa
    KEK, Ibaraki, Japan
  • S. Kashiwagi
    Tohoku University, Research Center for Electron Photon Science, Sendai, Japan
  • R. Kuroda
    AIST, Tsukuba, Ibaraki, Japan
  
  Funding: Work supported by JSPS Grant-in-Aid for Scientific Research(A)10001690 and JST Quantum Beam Program.
At Wase­da Uni­ver­si­ty, we have been study­ing a high qual­i­ty elec­tron beam gen­er­a­tion and its ap­pli­ca­tion ex­per­i­ments with a Cs-Te pho­to­cath­ode RF-Gun. To gen­er­ate more in­tense and sta­ble elec­tron beam, we have been de­vel­op­ing the cath­ode ir­ra­di­at­ing UV laser which con­sists of op­ti­cal fiber am­pli­fi­er and LD pumped am­pli­fi­er. As the re­sult, more than 100 mul­ti-bunch elec­tron beam with 1nC each bunch charge was ob­tained. How­ev­er, it is con­sid­ered that the ac­cel­er­at­ing volt­age will de­crease be­cause of the beam load­ing ef­fect. So we have stud­ied the RF am­pli­tude mod­u­la­tion tech­nique to com­pen­sate the beam en­er­gy dif­fer­ence. The en­er­gy dif­fer­ence will caused by tran­sient ac­cel­er­at­ing volt­age in RF-Gun cav­i­ty and beam load­ing ef­fect. As the re­sult of this com­pen­sa­tion method, the en­er­gy dif­fer­ence has been com­pen­sat­ed to 1%p-p, while 5%p-p with­out com­pen­sa­tion. In this con­fer­ence, we will re­port the de­tails of en­er­gy com­pen­sa­tion method using the RF am­pli­tude mod­u­la­tion, the re­sults of beam ex­per­i­ments and the fu­ture plans.