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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/12206323
Record Status
Checked
Record Id
12206323
Title
The Preparation of Atomically Clean Metal Surfaces for use as Photocathodes in Normally Conducting RF Guns
Contributors
T Noakes (ASTeC)
,
A Hannah (ASTeC)
,
K Middleman (ASTeC)
,
BL Militsyn (ASTeC)
,
R Valizadeh (ASTeC)
,
S Mistry (Loughborough U.)
Abstract
This work reports a study of various alternative metal samples as candidate materials for use as photocathodes in normally conducting RF guns. Clean surfaces were prepared using Argon ion bombardment and quantum efficiency measured using a 265 nm UV LED light source with a picoammeter for drain current monitoring. Surface composition was studied using X-ray photoelectron spectroscopy and a Kelvin probe apparatus provided work function measurements. Data was taken both before and after annealing to 200°C, a temperature that is routinely achieved during RF gun vacuum baking. Ion bombardment typically leaves a very rough surface that can have a detrimental effect on beam emittance, so further work will focus on the use of Oxygen plasma cleaning of the best candidate alternative metals. An oxygen plasma treated Copper photocathode has been shown to produce an acceptable level of quantum efficiency in the VELA accelerator at Daresbury Laboratory.
Organisation
ASTeC
,
STFC
Keywords
ASTeC 2014-2015
,
03 Particle Sources and Alternative Acceleration Techniques
,
T02 Electron Sources
Funding Information
Related Research Object(s):
Licence Information:
Language
English (EN)
Type
Details
URI(s)
Local file(s)
Year
Paper In Conference Proceedings
In 5th International Particle Accelerator Conference (IPAC14), Dresden, Germany, 15-20th June, 2014, (2014).
http://jacow.org/…/papers/mopri047.pdf
2014
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