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Title: Optimization of cathodic arc deposition and pulsed plasma melting techniques for growing smooth superconducting Pb photoemissive films for SRF injectors

Journal Article · · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
 [1];  [1];  [2];  [3];  [1]
  1. National Centre for Nuclear Research (NCBJ), Otwock-Swierk (Poland)
  2. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
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Superconducting photoinjectors have the potential to be the optimal solution for moderate and high current cw operating free electron lasers. For this application, a superconducting lead (Pb) cathode has been proposed to simplify the cathode integration into a 1.3 GHz, TESLA-type, 1.6-cell long clean superconducting gun cavity. In the proposed design, a lead film several micrometers thick is deposited onto a niobium plug attached to the cavity back wall. Traditional lead deposition techniques usually produce very non-uniform emission surfaces and/or poor adhesion of the layer. We describe here a pulsed plasma melting procedure reducing the non-uniformity of the lead photocathodes. In order to determine optimal parameters for the plasma procedure, heat transfer from plasma to the film was first modelled to evaluate melting front penetration range and liquid state duration. The procedure was used to prepare a photocathode plug, which was then tested in an electron gun. The quantum efficiency and value of cavity quality factor have been found to satisfy the requirements for an injector for the E-XFEL facility.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); European Commission (EC)
Grant/Contract Number:
AC02-76SF00515; 31245; KC0407-ALSJNT-I0013; SC0012704
OSTI ID:
1439089
Alternate ID(s):
OSTI ID: 1440885; OSTI ID: 1548674
Report Number(s):
BNL-205740-2018-JAAM; PII: S0168900218301876; TRN: US1900554
Journal Information:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 891, Issue C; ISSN 0168-9002
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 3 works
Citation information provided by
Web of Science

Figures / Tables (14)

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Table 1(p. 7)table Table 1
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Related Subjects

42 ENGINEERING
Photocathodes
Pb layers
Cathodic arc
Surface melting
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
photocathodes
pB layers
cathodic arc
surface melting