Author: Xiang, R.
Paper Title Page
TUPAB387 Superconducting Solenoid Field Measurement and Optimization 2425
 
  • S. Ma, A. Arnold, P. Murcek, A.A. Ryzhov, J. Schaber, J. Teichert, R. Xiang, P.Z. Zwartek
    HZDR, Dresden, Germany
  • H.J. Qian
    DESY Zeuthen, Zeuthen, Germany
  
  The so­le­noid is a sig­nif­i­cant part of an elec­tron in­jec­tor to pro­vide a proper fo­cus­ing, and pre­serve the beam pro­jected emit­tance. A su­per­con­duct­ing so­le­noid is ap­plied for the SRF pho­toin­jec­tor at HZDR. The so­le­noid it­self can de­grade elec­tron beam qual­ity due to mag­netic field im­per­fec­tions like mul­ti­pole com­po­nents. In order to de­ter­mine the field aber­ra­tions in the so­le­noid, we mea­sured the su­per­con­duct­ing so­le­noid mag­netic field in the cry­omod­ule. A sim­ple and ef­fec­tive method is used to an­a­lyze the mul­ti­pole field com­po­nents, which will be pre­sented in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB387  
About • paper received ※ 19 May 2021       paper accepted ※ 02 June 2021       issue date ※ 20 August 2021  
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WEXC03 Review of Superconducting Radio Frequency Gun 2556
 
  • R. Xiang
    HZDR, Dresden, Germany
  
  The suc­cess of pro­posed high power free-elec­tron lasers (FELs) and en­ergy re­cov­ery linac (ERL) largely de­pends on the de­vel­op­ment of the elec­tron source, which re­quires the best beam qual­ity and CW op­er­a­tion. An el­e­gant way to re­al­ize this av­er­age bril­liance is to com­bine the high beam qual­ity of ma­ture nor­mal con­duct­ing radio fre­quency pho­toin­jec­tor with the quick de­vel­op­ing su­per­con­duct­ing radio fre­quency tech­nol­ogy, to build su­per­con­duct­ing rf pho­toin­jec­tors (SRF guns). In last decade, sev­eral SRF gun pro­grams based on dif­fer­ent ap­proaches have achieved promis­ing progress, even suc­ceeded in rou­tine op­er­a­tion at BNL and HZDR [*,**]. In the near fu­ture SRF guns are ex­pected to play an im­por­tant role for hard X-ray FEL fa­cil­i­ties. In this con­tri­bu­tion, we will re­view the de­sign con­cepts, pa­ra­me­ters, and the sta­tus of the major SRF gun pro­jects.
*I. Petrushina et al., Phys. Rev. Lett. 124, 244801
**J. Teichert at al., Phys. Rev. Accel. Beams 24, 033401
 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEXC03  
About • paper received ※ 19 May 2021       paper accepted ※ 28 June 2021       issue date ※ 23 August 2021  
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WEPAB109 Initial Study of GaN Thin Films for Photocathodes Prepared by Magnetron Sputtering on Copper Substrates 2850
 
  • M. Vogel, X. Jiang, C. Wang
    University Siegen, Siegen, Germany
  • P. Murcek, J. Schaber, R. Xiang
    HZDR, Dresden, Germany
  
  Funding: This research is funded by the Federal Ministry of Education and Research of Germany in the framework of BETH (project number 05K19PSB).
On the path for high bright­ness elec­tron beams, Gal­lium Ni­tride (GaN) is one promis­ing can­di­date for a photo-cath­ode ma­te­r­ial. In this con­tri­bu­tion, we re­port on the con­tin­u­a­tion of the study to op­ti­mize the crys­tal­liza­tion qual­ity and crys­tal­log­ra­phy of Mg-doped GaN sam­ples on cop­per sub­strates that are syn­the­sized by RF mag­netron sput­ter­ing. SEM and XRD re­sults show that the pre­treat­ment meth­ods and the sput­ter­ing con­di­tions (tem­per­a­ture, sput­ter­ing power, and par­tial pres­sure of the re­ac­tive gas) can both af­fect the mor­phol­ogy and crys­tal qual­ity of GaN films. The ini­tial QE mea­sure­ments of these sam­ples are done in our newly build in-situ QE mea­sure­ment sys­tem and the first re­sults of QE analy­ses done at Helmholtz-Zen­trum Dres­den-Rossendorf (HZDR) are pre­sented in a ded­i­cated con­tri­bu­tion.
Part of this work was performed at the Micro- and Nanoanalytics Facility (MNaF) of the University of Siegen. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB109  
About • paper received ※ 19 May 2021       paper accepted ※ 09 June 2021       issue date ※ 27 August 2021  
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