Author: Choi, H. J.
Paper Title Page
MOPME060 Introduction to Beam Diagnostics Components for PAL-ITF 610
 
  • H. J. Choi, M.S. Chae, J.H. Hong, C. Kim, D.T. Kim, S.J. Park
    PAL, Pohang, Kyungbuk, Republic of Korea
  
  Po­hang Ac­cel­er­a­tor Lab­o­ra­tory (PAL) is build­ing the 4th gen­er­a­tion X-ray free elec­tron laser (XFEL). The In­jec­tion Test Fa­cil­ity (ITF) is a test fa­cil­ity es­tab­lished to im­prove the func­tions of the laser gun and pre-in­jec­tor to be in­stalled in XFEL. To im­prove the ef­fects of ITF, two fac­tors are re­quired. The first is to be able to gen­er­ate low-emit­tance elec­tron beams sta­bly at the laser gun, and the sec­ond is to con­trol in­creas­ing emit­tance by space charge ef­fect by ac­cel­er­at­ing elec­tron beams with high en­ergy at the pre-in­jec­tor. In this way, high-qual­ity elec­tron beams can be ma­te­ri­al­ized. Var­i­ous beam di­ag­nos­tics are in­stalled in the ac­cel­er­a­tor sys­tem for beam di­ag­nos­tics and mea­sure­ments. Five kinds of beam di­ag­nos­tics were in­stalled in the PAL-ITF. These are (1) ICT and (2) Fara­day Cup to mea­sure cur­rent and elec­trons charge, (3) Stripline BPM to mea­sure the lo­ca­tion of beams, (4) a YAG/OTR Screen Mon­i­tor to mea­sure beam en­ergy and trans­verse pro­file mo­tion and (5) a Wire Scan­ner to mea­sure beam size. In this paper, the pur­poses and prop­er­ties of each di­ag­nos­tic unit and mea­sure­ment re­sults are in­tro­duced.  
 
WEPWA043 Construction of Injector Test Facility (ITF) for the PAL XFEL 2220
 
  • S.J. Park, H. J. Choi, T. Ha, J.H. Han, J.H. Hong, W.H. Hwang, H.-S. Kang, T.-H. Kang, D.T. Kim, J.M. Kim, S.-C. Kim, I.S. Ko, B.H. Lee, H.-S. Lee, W.W. Lee, C.-K. Min, Y.J. Park, Y.G. Son
    PAL, Pohang, Kyungbuk, Republic of Korea
  • M.S. Chae
    POSTECH, Pohang, Kyungbuk, Republic of Korea
  
  Funding: Work supported by the Ministry of Education, Science and Technology (MEST) in Korea.
An in­jec­tor test fa­cil­ity (ITF) for the PAL-XFEL has been suc­cess­fully con­structed and its com­mis­sion­ing is under way. The fa­cil­ity is to demon­strate beam per­for­mances re­quired by the PAL XFEL (beam en­ergy of 139 MeV, pro­jected rms emit­tance of < 0.5 mm mrad @ 200 pC, and beam rep­e­ti­tion rate of 60 Hz) with good enough sta­bil­i­ties. We have con­structed a ded­i­cated build­ing for the fa­cil­ity in which a ra­di­a­tion-shield­ing tun­nel (19.2-m long, 3.5-m wide, and 2.4-m high inner space), a kly­stron-mod­u­la­tor gallery, a laser room, and a con­trol room are in­stalled. The in­jec­tor con­sists of an in-house-de­vel­oped photo-cath­ode rf gun, a 30-mJ Ti:Sa laser sys­tem, two ac­cel­er­at­ing struc­tures (as well as two sets of kly­stron-mod­u­la­tor sys­tems), and var­i­ous di­ag­nos­tics as well as mag­nets & in­stru­men­ta­tions. The in­stal­la­tion of a trans­verse de­flect­ing cav­ity (S-band, 10-fs res­o­lu­tion) and a laser heater is sched­uled in 2013. In this ar­ti­cle we re­port on the fa­cil­ity con­struc­tion and some of the early com­mi­sison­ing re­sults.