Author: Lucas, T.G.
Paper Title Page
TU1PA01 A Discussion of Key Concepts for the Next Generation of High Brightness Injectors 324
 
  • T.G. Lucas, P. Craievich, S. Reiche
    PSI, Villigen PSI, Switzerland
  
  The pro­duc­tion of high bright­ness elec­tron beams has been key to the suc­cess of the X-ray free-elec­tron laser (XFEL) as the new fron­tier in X-ray sources. The past two decades have seen the com­mis­sion­ing of nu­mer­ous XFEL fa­cil­i­ties, which quickly sur­passed Syn­chro­tron light sources to be­come the most bril­liant X-ray sources. Such fa­cil­i­ties have, so far, heav­ily re­lied on room tem­per­a­ture S-band RF pho­to­guns to pro­duce the high bright­ness elec­tron bunches re­quired for las­ing, how­ever such pho­to­guns are reach­ing their peak per­for­mance limit and new meth­ods must be in­ves­ti­gated to con­tinue to in­crease the bright­ness of these fa­cil­i­ties. This talk will begin with a re­view of the de­sign and per­for­mance of sev­eral elec­tron guns cur­rently op­er­a­tional in XFELs. Fol­low­ing will be a dis­cus­sion of cur­rent ef­forts in con­tin­u­ing to in­crease this peak bright­ness in­clud­ing mov­ing to cold cath­ode schemes and the use of very high gra­di­ents on the cath­ode. Fi­nally we will de­scribe on­go­ing ac­tiv­i­ties at PSI to de­velop the next gen­er­a­tion of high gra­di­ent RF pho­to­guns for in­creased peak bright­ness.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TU1PA01  
About • Received ※ 24 August 2022 — Revised ※ 27 August 2022 — Accepted ※ 07 September 2022 — Issue date ※ 16 September 2022
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TH2AA02 RF System Performance in the SwissFEL Linac 679
 
  • C.D. Beard, J. Alex, H.-H. Braun, P. Craievich, Z. Geng, N. Hiller, R. Kalt, C. Kittel, T. Lippuner, T.G. Lucas, M. Pedrozzi, E. Prat, S. Reiche, T. Schietinger, W.T. Tron, D. Voulot, R. Zennaro
    PSI, Villigen PSI, Switzerland
  
  The Hard X-ray FEL ma­chine Swiss­FEL at the Paul Scher­rer In­sti­tut in Switzer­land is com­mis­sioned and tran­sit­ing to user op­er­a­tion smoothly. FEL op­er­a­tion re­quires strin­gent re­quire­ments for the beam sta­bil­ity at the linac out­put, such as the elec­tron bunch ar­rival time, peak cur­rent and beam en­ergy. Among other things, a highly sta­ble RF sys­tem is re­quired to guar­an­tee the beam sta­bil­ity. RF per­for­mance often dom­i­nates the over­all per­for­mance and avail­abil­ity of FELs, and for this rea­son the Swiss­FEL RF sys­tem has been de­signed based on the state-of-the-art tech­nolo­gies that have en­abled ex­cel­lent RF sta­bil­ity, re­sult­ing in an ar­rival time jit­ter of ~10 fs rms and rel­a­tive beam en­ergy sta­bil­ity of 10-4 rms. This paper aims to pro­vide an un­der­stand­ing of the peak per­for­mance of the RF sys­tems and to high­light pos­si­ble lim­i­ta­tion cur­rently faced, fo­cus­ing on the S-, C- and X-Band sys­tems.  
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slides icon Slides TH2AA02 [4.813 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TH2AA02  
About • Received ※ 20 August 2022 — Revised ※ 26 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 02 September 2022
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