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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/39596257
Record Status
Checked
Record Id
39596257
Title
Metal Photocathodes Preparation for Compact Linear Accelerator at Daresbury Laboratory
Contributors
AN Hannah (STFC Daresbury Lab.)
,
JA Conlon (STFC Daresbury Lab.)
,
LB Jones (STFC Daresbury Lab.)
,
BL Militsyn (STFC Daresbury Lab.)
,
TCQ Noakes (STFC Daresbury Lab.)
,
R Valizadeh (STFC Daresbury Lab.)
,
VR Dhanak
,
S Lederer
Abstract
The photoinjector of the CLARA FEL test facility Front End at Daresbury Laboratory is based on a S-band 10 Hz photocathode RF-gun operating with a copper photocath-ode which is driven by the third harmonic of a Ti:Sapphire laser (266 nm). The main aim of this study was to establish a procedure to prepare the Cu surface prior to installation so a Quantum Efficiency (QE) of 10-5 or higher can be achieved at laser power density below the ablation threshold of copper. The best results have been obtained by ex-situ chemical cleaning. This removed the surface oxide layer whilst at the same time producing a surface buffer layer. This inhibited the regrowth of native oxide for up to a week when exposed to normal ambient atmospheric conditions. With either chemical cleaning or Ar plasma cleaning after heating the sample in-situ to 150 °C for 90 minutes or 250 °C for 40 hours, almost all of the surface oxide was removed. For these surfaces a QE of 4.10-5 or better was measured. Oxygen plasma cleaning at 100% and 20% power produced CuO layer with surface carbon contaminant to 3 atomic %, however in-situ thermal cycling resulted in at best a QE of 3·10-6.
Organisation
ASTeC
,
STFC
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Language
English (EN)
Type
Details
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Paper In Conference Proceedings
In 9th International Particle Accelerator Conference (IPAC18), Vancouver, Canada, 29 Apr 2018 - 4 May 2018, (2018): 3865-3868.
http://accelconf.…/papers/thpal095.pdf
2018
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