TUPRC027

Methods for Bunch Shape Monitor Phase Resolution Improvement

 PosterTUOP11

 [1.884 MB]

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

poster icon

Bunch shape mon­i­tors, based on sec­ondary elec­trons emis­sion, are widely used for mea­sure­ments of lon­gi­tu­di­nal bunch pro­files dur­ing a linac com­mis­sion­ing and ini­tial op­ti­miza­tion of beam dy­nam­ics. A typ­i­cal phase res­o­lu­tion of these de­vices is about 1°. How­ever it be­comes in­suf­fi­cient for new mod­ern linacs, which re­quire a bet­ter res­o­lu­tion. Some de­vel­oped meth­ods for a phase res­o­lu­tion im­prove­ment are dis­cussed.

 

 

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. Paramonov  RAS/INR, Moscow, Russia

 

The 250 MeV CLARA FEL test fa­cil­ity is now under con­struc­tion at Dares­bury Lab­o­ra­tory. Elec­tron beam for this fa­cil­ity is pro­vided by two nor­mal con­duct­ing S-band pho­to­cath­ode guns: a 10 Hz 2.5 cell gun ear­lier used as the in­jec­tor for the VELA ma­chine, and a 400 Hz 1.5 cell gun now under com­mis­sion­ing. At the ini­tial stage of Phase I CLARA will op­er­ate with the 10 Hz gun and a 45 MeV 2 m long linac sec­tion work­ing as a buncher and/or booster. The beam will be de­flected into the ex­ist­ing VELA beam­line with an S-bend and di­rected to the spec­trom­e­ter line for analysing beam prop­er­ties or into one of two VELA user areas. The 400 Hz gun will be in­stalled in the VELA beam­line for de­tailed high power RF and beam com­mis­sion­ing in the VELA beam di­ag­nos­tics suite. As the 400 Hz gun is equipped with an in­ter­change­able pho­to­cath­ode it is pos­si­ble to in­ves­ti­gate dif­fer­ent metal pho­to­cath­odes and se­lect the one pro­vid­ing min­i­mal beam emit­tance at high­est quan­tum ef­fi­ciency. A state of the art pho­to­cath­ode prepa­ra­tion sys­tem is under com­mis­sion­ing at Dares­bury. After com­mis­sion­ing the 400 Hz gun will be in­stalled to the CLARA beam line to de­liver high en­ergy, high rep­e­ti­tion rate beams for the FEL fa­cil­ity, and the 10 Hz gun will be re­turned to the VELA beam line.

 

IBIC2016  

Proceedings of the 5th International Beam Instrumentation Conference

WEPG47

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 trans­verse de­flect­ing sys­tem (TDS) is under com­mis­sion­ing at the Photo In­jec­tor Test Fa­cil­ity at DESY, Zeuthen site (PITZ). The struc­ture was de­signed and man­u­fac­tured by the In­sti­tute for Nu­clear Re­search (INR RAS, Moscow, Rus­sia) as pro­to­type for the TDS in the in­jec­tor part of the Eu­ro­pean XFEL. Last year the de­flec­tion volt­age was lim­ited for safety rea­sons, but after thor­ough in­ves­ti­ga­tions of the wave­guide sys­tem we are now able to op­er­ate the cav­ity close to de­sign spec­i­fi­ca­tions. The PITZ TDS streaks the elec­tron beam ver­ti­cally, al­low­ing mea­sure­ments of the lon­gi­tu­di­nal bunch pro­file, and, in com­bi­na­tion with a sub­se­quent hor­i­zon­tal bend­ing mag­net, also of the lon­gi­tu­di­nal phase space and slice en­ergy spread. Fur­ther­more, sev­eral quadru­pole mag­nets and screen sta­tions can be em­ployed for slice emit­tance mea­sure­ments using the TDS. This paper de­scribes the progress in com­mis­sion­ing of the hard­ware, mea­sure­ment tech­niques and sim­u­la­tions, and out­lines the prospects of re­li­able slice emit­tance mea­sure­ments at 20 MeV/c, where space charge forces com­pli­cate the de­ter­mi­na­tion of trans­fer ma­tri­ces.

 

conference logo

 

IPAC2016 – Proceedings  Busan, Korea

 

TUPOW003

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 In­jec­tor Test fa­cil­ity at DESY, Zeuthen site (PITZ), was built with the aim to de­velop and char­ac­ter­ize elec­tron sources for fu­ture usage at FLASH and at the Eu­ro­pean XFEL. Re­cently, the main focus at PITZ has been the study of gun re­li­a­bil­ity and pho­toin­jec­tor per­for­mance at high av­er­age power. The goal is to get sta­ble and re­li­able op­er­a­tion with 6.4 MW peak power in the gun at 650 us RF pulse length and 10 Hz rep­e­ti­tion rate. To achieve this, a new RF feed sys­tem with two RF win­dows was in­stalled at PITZ in 2014. Dur­ing this test, the old gun 4.2 with a mod­i­fied back-plane de­sign for bet­ter cath­ode con­tact has been used. In this con­tri­bu­tion the re­sults of the RF con­di­tion­ing of gun 4.2 with a de­tailed in­ter­lock analy­sis will be re­ported as well as re­sults from re­cent elec­tron beam char­ac­ter­i­za­tion.

 

 

 

ËàÏëàç-2017

25-26 ÿíâàðÿ 2017 ãîäà. Ñåêöèÿ: "Óñêîðèòåëè çàðÿæåííûõ ÷àñòèö"  ( PDF )

Çàñåäàíèå ¹1

11.45 -12.05

Ñðåäà, 25 ÿíâàðÿ

Àóäèòîðèÿ Ã- 401

 

PARAMONOV.V., PHILLIP S., RYBAKOV I., SKASSYRSKAYA A., STEPHAN F.

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

Çàñåäàíèå ¹ 3

13.15 - 13.35

×åòâåðã, 26 ÿíâàðÿ

Àóäèòîðèÿ Ê - 608

ÐÛÁÀÊÎÂ È.Â.,  ÏÀÐÀÌÎÍÎÂ Â.Â.

Èíñòèòóò ÿäåðíûõ èññëåäîâàíèé ÐÀÍ, Ìîñêâà

Ìåòîäèêà êîíòðîëÿ êà÷åñòâà èçãîòîâëåíèÿ óñêîðÿþùåé ñòðóêòóðû