Methods for Bunch Shape Monitor Phase Resolution Improvement


[1.884 MB]

A. Feschenko, S.A. Gavrilov††† RAS/INR, Moscow, Russia

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Bunch shape mon≠i≠tors, based on sec≠ondary elec≠trons emis≠sion, are widely used for mea≠sure≠ments of lon≠gi≠tu≠di≠nal bunch pro≠files dur≠ing a linac com≠mis≠sion≠ing and ini≠tial op≠ti≠miza≠tion of beam dy≠nam≠ics. A typ≠i≠cal phase res≠o≠lu≠tion of these de≠vices is about 1į. How≠ever it be≠comes in≠suf≠fi≠cient for new mod≠ern linacs, which re≠quire a bet≠ter res≠o≠lu≠tion. Some de≠vel≠oped meth≠ods for a phase res≠o≠lu≠tion im≠prove≠ment are dis≠cussed.



Status of the Injection System of the CLARA FEL Test Facility


  • B.L. Militsyn, D. Angal-Kalinin, R.K. Buckley, R.J. Cash, J.A. Clarke, L.S. Cowie, B.D. Fell, P. Goudket, T.J. Jones, K.B. Marinov, P.A. McIntosh, J.W. McKenzie, K.J. Middleman, T.C.Q. Noakes, B.J.A. Shepherd, R. Valizadeh, A.E. Wheelhouse
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • G. Burt Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
  • V.V. ParamonovRAS/INR, Moscow, Russia


The 250 MeV CLARA FEL test fa≠cil≠ity is now under con≠struc≠tion at Dares≠bury Lab≠o≠ra≠tory. Elec≠tron beam for this fa≠cil≠ity is pro≠vided by two nor≠mal con≠duct≠ing S-band pho≠to≠cath≠ode guns: a 10 Hz 2.5 cell gun ear≠lier used as the in≠jec≠tor for the VELA ma≠chine, and a 400 Hz 1.5 cell gun now under com≠mis≠sion≠ing. At the ini≠tial stage of Phase I CLARA will op≠er≠ate with the 10 Hz gun and a 45 MeV 2 m long linac sec≠tion work≠ing as a buncher and/or booster. The beam will be de≠flected into the ex≠ist≠ing VELA beam≠line with an S-bend and di≠rected to the spec≠trom≠e≠ter line for analysing beam prop≠er≠ties or into one of two VELA user areas. The 400 Hz gun will be in≠stalled in the VELA beam≠line for de≠tailed high power RF and beam com≠mis≠sion≠ing in the VELA beam di≠ag≠nos≠tics suite. As the 400 Hz gun is equipped with an in≠ter≠change≠able pho≠to≠cath≠ode it is pos≠si≠ble to in≠ves≠ti≠gate dif≠fer≠ent metal pho≠to≠cath≠odes and se≠lect the one pro≠vid≠ing min≠i≠mal beam emit≠tance at high≠est quan≠tum ef≠fi≠ciency. A state of the art pho≠to≠cath≠ode prepa≠ra≠tion sys≠tem is under com≠mis≠sion≠ing at Dares≠bury. After com≠mis≠sion≠ing the 400 Hz gun will be in≠stalled to the CLARA beam line to de≠liver high en≠ergy, high rep≠e≠ti≠tion rate beams for the FEL fa≠cil≠ity, and the 10 Hz gun will be re≠turned to the VELA beam line.



Proceedings of the 5th International Beam Instrumentation Conference


Progress on the PITZ TDS

  • H. Huck, P. Boonpornprasert, L. Jachmann, W. Köhler, M. Krasilnikov, A. Oppelt, F. Stephan
    DESY Zeuthen, Zeuthen, Germany
  • L.V. Kravchuk, V.V. Paramonov, A.A. Zavadtsev
    RAS/INR, Moscow, Russia
  • C. Saisa-ard Chiang Mai University, Chiang Mai, Thailand


A trans≠verse de≠flect≠ing sys≠tem (TDS) is under com≠mis≠sion≠ing at the Photo In≠jec≠tor Test Fa≠cil≠ity at DESY, Zeuthen site (PITZ). The struc≠ture was de≠signed and man≠u≠fac≠tured by the In≠sti≠tute for Nu≠clear Re≠search (INR RAS, Moscow, Rus≠sia) as pro≠to≠type for the TDS in the in≠jec≠tor part of the Eu≠ro≠pean XFEL. Last year the de≠flec≠tion volt≠age was lim≠ited for safety rea≠sons, but after thor≠ough in≠ves≠ti≠ga≠tions of the wave≠guide sys≠tem we are now able to op≠er≠ate the cav≠ity close to de≠sign spec≠i≠fi≠ca≠tions. The PITZ TDS streaks the elec≠tron beam ver≠ti≠cally, al≠low≠ing mea≠sure≠ments of the lon≠gi≠tu≠di≠nal bunch pro≠file, and, in com≠bi≠na≠tion with a sub≠se≠quent hor≠i≠zon≠tal bend≠ing mag≠net, also of the lon≠gi≠tu≠di≠nal phase space and slice en≠ergy spread. Fur≠ther≠more, sev≠eral quadru≠pole mag≠nets and screen sta≠tions can be em≠ployed for slice emit≠tance mea≠sure≠ments using the TDS. This paper de≠scribes the progress in com≠mis≠sion≠ing of the hard≠ware, mea≠sure≠ment tech≠niques and sim≠u≠la≠tions, and out≠lines the prospects of re≠li≠able slice emit≠tance mea≠sure≠ments at 20 MeV/c, where space charge forces com≠pli≠cate the de≠ter≠mi≠na≠tion of trans≠fer ma≠tri≠ces.


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IPAC2016 Ė ProceedingsBusan, Korea



High Average RF Power Tests With 2 RF Vacuum Windows at PITZ


  • Y. Renier, G. Asova, M. A. Bakr, P. Boonpornprasert, J.D. Good, M. Groß, C. Hernandez-Garcia, H. Huck, I.I. Isaev, D.K. Kalantaryan, M. Krasilnikov, O. Lishilin, G. Loisch, D. Malyutin, D. Melkumyan, A. Oppelt, M. Otevřel, G. Pathak, T. Rublack, I.V. Rybakov, F. Stephan, G. Vashchenko, Q.T. Zhao
    DESY Zeuthen, Zeuthen, Germany
  • M. Bousonville, S. Choroba, S. Lederer DESY, Hamburg, Germany


The Photo In≠jec≠tor Test fa≠cil≠ity at DESY, Zeuthen site (PITZ), was built with the aim to de≠velop and char≠ac≠ter≠ize elec≠tron sources for fu≠ture usage at FLASH and at the Eu≠ro≠pean XFEL. Re≠cently, the main focus at PITZ has been the study of gun re≠li≠a≠bil≠ity and pho≠toin≠jec≠tor per≠for≠mance at high av≠er≠age power. The goal is to get sta≠ble and re≠li≠able op≠er≠a≠tion with 6.4 MW peak power in the gun at 650 us RF pulse length and 10 Hz rep≠e≠ti≠tion rate. To achieve this, a new RF feed sys≠tem with two RF win≠dows was in≠stalled at PITZ in 2014. Dur≠ing this test, the old gun 4.2 with a mod≠i≠fied back-plane de≠sign for bet≠ter cath≠ode con≠tact has been used. In this con≠tri≠bu≠tion the re≠sults of the RF con≠di≠tion≠ing of gun 4.2 with a de≠tailed in≠ter≠lock analy≠sis will be re≠ported as well as re≠sults from re≠cent elec≠tron beam char≠ac≠ter≠i≠za≠tion.





25-26 ˇŪ‚ŗūˇ 2017 „Óšŗ. —ŚÍŲŤˇ: "”ŮÍÓūŤÚŚŽŤ ÁŗūˇśŚŪŪŻű ųŗŮÚŤŲ"  ( PDF )

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Development of the L-band normal conducting RF gun cavity for high peak and average RF power

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