Author: Bainbridge, A.R.
Paper Title Page
THPOJO09 Status of CLARA at Daresbury Laboratory 711
 
  • D. Angal-Kalinin, A.R. Bainbridge, A.D. Brynes, R.K. Buckley, S.R. Buckley, H.M. Castañeda Cortés, J.A. Clarke, L.S. Cowie, K.D. Dumbell, D.J. Dunning, A.J. Gilfellon, A.R. Goulden, J. Henderson, S. Hitchen, F. Jackson, C.R. Jenkins, M.A. Johnson, J.K. Jones, N.Y. Joshi, M.P. King, S.L. Mathisen, J.W. McKenzie, R. Mclean, K.J. Middleman, B.L. Militsyn, K.T. Morrow, A.J. Moss, B.D. Muratori, T.C.Q. Noakes, W.A. Okell, H.L. Owen, T.H. Pacey, A.E. Pollard, M.D. Roper, Y.M. Saveliev, D.J. Scott, B.J.A. Shepherd, R.J. Smith, E.W. Snedden, N. Thompson, C. Tollervey, R. Valizadeh, D.A. Walsh, A.E. Wheelhouse, P.H. Williams
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • A.R. Bainbridge, A.D. Brynes, J.A. Clarke, L.S. Cowie, K.D. Dumbell, D.J. Dunning, C.R. Jenkins, K.J. Middleman, A.J. Moss, B.D. Muratori, H.L. Owen, Y.M. Saveliev, D.J. Scott, B.J.A. Shepherd, N. Thompson, R. Valizadeh, A.J. Vick, A.E. Wheelhouse
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • A.D. Brynes
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  • R.J. Cash, R.F. Clarke, M. Colling, G. Cox, B.D. Fell, S.A. Griffiths, M.D. Hancock, T. Hartnett, J.P. Hindley, C. Hodgkinson, G. Marshall, A. Oates, A.J. Vick, J.T.G. Wilson
    STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
  • J. Henderson
    Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
  
  CLARA (Com­pact Lin­ear Ac­cel­er­a­tor for Re­search and Ap­pli­ca­tions) is a test fa­cil­ity for Free Elec­tron Laser (FEL) re­search and other ap­pli­ca­tions at STFC’s Dares­bury Lab­o­ra­tory. The Front End of CLARA has been used for user ex­ploita­tion pro­gramme from 2018. The sec­ond ex­ploita­tion pe­riod in 2021-22 pro­vided a range of beam pa­ra­me­ters to 8 user ex­per­i­ments. We re­port on the sta­tus, fur­ther ma­chine de­vel­op­ment, and fu­ture plans for CLARA in­clud­ing Full En­ergy Beam Ex­ploita­tion (FEBE) beam­line which will pro­vide 250 MeV/c high bright­ness beam for novel ex­per­i­ments.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-THPOJO09  
About • Received ※ 19 August 2022 — Revised ※ 28 August 2022 — Accepted ※ 05 September 2022 — Issue date ※ 15 September 2022
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TUPOGE07 Magnetic Field Measurements and Shielding at the UKRI-STFC Daresbury Laboratory SRF Vertical Test Facility 495
 
  • A.E.T. Akintola, A.R. Bainbridge, S. Hitchen, A.J. May, S.M. Pattalwar, P.A. Smith
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • M. Lowe, D.A. Mason, A.D. Shabalina
    STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
  
  A novel ver­ti­cal test fa­cil­ity has been de­vel­oped, com­mis­sioned, and en­tered steady-state op­er­a­tions at the UKRI-STFC Dares­bury Lab­o­ra­tory. The cryo­stat is de­signed to test 3 jack­eted su­per­con­duct­ing RF cav­i­ties in a hor­i­zon­tal con­fig­u­ra­tion in a sin­gle cool-down run at 2 K. A 2-year pro­gram is cur­rently un­der­way to test ESS high-beta cav­i­ties. Upon com­ple­tion of this pro­gram, the fa­cil­ity will un­der­take a test­ing pro­gram for PIP-II HB650 cav­i­ties. In the cur­rent con­fig­u­ra­tion, a so­lu­tion com­bin­ing pas­sive and ac­tive mag­netic shield­ing has been val­i­dated for the ESS re­quire­ment of field at­ten­u­a­tion to the level of <1 uT, al­though con­tin­u­ous field mea­sure­ments are not pro­vided. This paper re­ports the im­ple­men­ta­tion of pas­sive and ac­tive shield­ing, along with sim­u­la­tion and ex­per­i­men­tal mea­sure­ments thereof.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOGE07  
About • Received ※ 22 August 2022 — Revised ※ 27 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 01 September 2022
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TUPORI18 The Design of the Full Energy Beam Exploitation (FEBE) Beamline on CLARA 585
 
  • D. Angal-Kalinin, A.R. Bainbridge, J.K. Jones, T.H. Pacey, Y.M. Saveliev, E.W. Snedden
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  
  The CLARA fa­cil­ity at Dares­bury Lab­o­ra­tory was orig-in­ally de­signed for the study of novel FEL physics utilis-ing high-qual­ity elec­tron bunches at up to 250 MeV/c. To max­imise the ex­ploita­tion of the ac­cel­er­a­tor com­plex, a ded­i­cated full en­ergy beam ex­ploita­tion (FEBE) beam-line has been de­signed and is cur­rently being in­stalled in a sep­a­rate vault on the CLARA ac­cel­er­a­tor. FEBE will allow the use of high charge (up to 250 pC), mod­er­ate en­ergy (up to 250 MeV), elec­tron bunches for a wide va­ri­ety of ac­cel­er­a­tor ap­pli­ca­tions crit­i­cal to on­go­ing ac­cel­er­a­tor de­vel­op­ment in the UK and in­ter­na­tional com­mu­ni­ties. The fa­cil­ity con­sists of a shielded en­clo-sure, ac­ces­si­ble dur­ing beam run­ning in CLARA, with two very large ex­per­i­men­tal cham­bers com­pat­i­ble with a wide range of ex­per­i­men­tal pro­pos­als. High-power laser beams (up to 100 TW) will be avail­able for elec­tron-beam in­ter­ac­tions in the first cham­ber, and there are con­crete plans for a wide va­ri­ety of ad­vanced di­ag­nos­tics (in­clud-ing a high-field per­ma­nent mag­net spec­trom­e­ter and di­elec­tric lon­gi­tu­di­nal streaker), es­sen­tial for mul­ti­ple ex­per­i­men­tal par­a­digms, in the sec­ond cham­ber. FEBE will be com­mis­sioned in 2024.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPORI18  
About • Received ※ 19 August 2022 — Revised ※ 23 August 2022 — Accepted ※ 28 August 2022 — Issue date ※ 15 September 2022
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THPORI15 Operation of the CLARA Linear Accelerator with 2.5 Cell 10 Hz Photocathode Gun with Interchangeable Photocathodes 854
 
  • B.L. Militsyn, D. Angal-Kalinin, A.R. Bainbridge, L.S. Cowie, A.J. Gilfellon, F. Jackson, N.Y. Joshi, K.J. Middleman, K.T. Morrow, T.C.Q. Noakes, M.D. Roper, R. Valizadeh, D.A. Walsh
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • R.J. Cash, B.D. Fell, T.J. Jones, A.J. Vick
    STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
  
  Dur­ing com­mis­sion­ing and op­er­a­tion run in 2021-2022 the pho­toin­jec­tor of the CLARA-VELA fa­cil­ity a 2.5 cell cav­ity S-band pho­to­cath­ode gun orig­i­nally de­vel­oped for the APEX ex­per­i­ment was used. The cop­per back wall of the cav­ity also served as the gun pho­to­cath­ode. In order to re­duce sig­nif­i­cant time re­quired for re­place­ment and/or re­ac­ti­va­tion of the pho­to­cath­ode and im­prove the flex­i­bil­ity of the in­jec­tor the gun has been up­graded for op­er­a­tion with DESY/INFN style in­ter­change­able pho­to­cath­odes. This up­grade in­cluded a new de­sign of the cav­ity back wall to ac­com­mo­date the pho­to­cath­ode socket and equip­ping the gun with a load-lock sys­tem. Mod­i­fi­ca­tion of the gun also re­quired re­place­ment of the buck­ing coil, which zeros field in the pho­to­cath­ode emis­sion plane. After the up­grade, the gun was com­mis­sioned and then op­er­ated with a hy­brid Cu/Mo pho­to­cath­ode dur­ing the last two years. Dur­ing win­ter-spring 2022 ex­per­i­men­tal run the gun steadily op­er­ated with a cath­ode field of 60 MV/m, lim­ited by the RF power avail­able and with an off-cen­tre di­a­mond turned pho­to­cath­ode which de­liv­ered sta­ble bunches with a charge of 100 pC.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-THPORI15  
About • Received ※ 24 August 2022 — Revised ※ 08 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 15 October 2022
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