IPAC2013 - List of Authors (Noakes, T.C.Q.)

Paper	Title	Page
MOPFI069	Preparation of the Polycrystalline Copper Photocathodes for the VELA RF Photocathode Gun	440
	R. Valizadeh, A.N. Hannah, K.J. Middleman, B.L. Militsyn, T.C.Q. Noakes, R.N.C. Santer STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom M.D. Roper STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
	The Electron Beam Test Facility (EBTF) is a high performance electron source under commissioning at ASTeC. The photoinjector of the source is based on a S-band photocathode RF gun operating with a copper photocathode which is driven by a third harmonic of Ti: Sapphire laser (266 nm). The photocathode used in the RF gun is an integrated part of the gun cavity which is polycrystalline copper disk, polished to 1um roughness, and is placed at the back wall of the first 0.5 cell in the gun cavity. In order to accomplish a procedure to activate surface prior installation, copper test samples with roughness of 0.1 um were prepared by different techniques. The best results have been obtained by ex-situ plasma cleaning in an oxygen atmosphere. Analyses showed that there was no carbon on the surface and the surface was composed of copper oxide. After heating the sample in-situ to 220 C for almost all the surface oxide was removed. For this surface a QE of 2 x10^-5 was measured. Further heating to higher temperature did not result in any improvement either in surface composition nor a noticeable increase in QE. Prepared such a way operational photocathode is now under commissioning in the gun.

THPWA036	Implementation and Commissioning of the New Electron Beam Test Facility (EBTF) at Daresbury Laboratory for Industrial Accelerator System	3708
	P.A. McIntosh, D. Angal-Kalinin, R.K. Buckley, S.R. Buckley, J.A. Clarke, B.D. Fell, A.R. Goulden, C. Hill, F. Jackson, S.P. Jamison, J.K. Jones, A. Kalinin, B.P.M. Liggins, J.W. McKenzie, K.J. Middleman, B.L. Militsyn, T.C.Q. Noakes, Y.M. Saveliev, B.J.A. Shepherd, S.L. Smith, T.T. Thakker, A.E. Wheelhouse STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom N. Bliss, G. Cox, G.P. Diakun, A. Gleeson, L. Ma, B.G. Martlew, A.J. Moss, K. Robertson, M.D. Roper, R.J. Smith STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
	The EBTF facility will provide enabling infrastructures targeted at the development and testing of novel and compact accelerator technologies, specifically through partnership with industry and aimed at addressing applications in medicine, health, security, energy and industrial processing. The facility has now been implemented at Daresbury Laboratory and the commissioning of the critical accelerator systems has been performed. The facility is now preparing for first exploitation with partnering industries that will be able to utilise the electron beam parameters available on EBTF to either demonstrate new techniques and/or processes or otherwise develop new technologies for future commercial realisation.

Paper

Title

Page

Preparation of the Polycrystalline Copper Photocathodes for the VELA RF Photocathode Gun

440

R. Valizadeh, A.N. Hannah, K.J. Middleman, B.L. Militsyn, T.C.Q. Noakes, R.N.C. Santer
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
M.D. Roper
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom

The Electron Beam Test Facility (EBTF) is a high performance electron source under commissioning at ASTeC. The photoinjector of the source is based on a S-band photocathode RF gun operating with a copper photocathode which is driven by a third harmonic of Ti: Sapphire laser (266 nm). The photocathode used in the RF gun is an integrated part of the gun cavity which is polycrystalline copper disk, polished to 1um roughness, and is placed at the back wall of the first 0.5 cell in the gun cavity. In order to accomplish a procedure to activate surface prior installation, copper test samples with roughness of 0.1 um were prepared by different techniques. The best results have been obtained by ex-situ plasma cleaning in an oxygen atmosphere. Analyses showed that there was no carbon on the surface and the surface was composed of copper oxide. After heating the sample in-situ to 220 C for almost all the surface oxide was removed. For this surface a QE of 2 x10^-5 was measured. Further heating to higher temperature did not result in any improvement either in surface composition nor a noticeable increase in QE. Prepared such a way operational photocathode is now under commissioning in the gun.

THPWA036

Implementation and Commissioning of the New Electron Beam Test Facility (EBTF) at Daresbury Laboratory for Industrial Accelerator System

3708

P.A. McIntosh, D. Angal-Kalinin, R.K. Buckley, S.R. Buckley, J.A. Clarke, B.D. Fell, A.R. Goulden, C. Hill, F. Jackson, S.P. Jamison, J.K. Jones, A. Kalinin, B.P.M. Liggins, J.W. McKenzie, K.J. Middleman, B.L. Militsyn, T.C.Q. Noakes, Y.M. Saveliev, B.J.A. Shepherd, S.L. Smith, T.T. Thakker, A.E. Wheelhouse
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
N. Bliss, G. Cox, G.P. Diakun, A. Gleeson, L. Ma, B.G. Martlew, A.J. Moss, K. Robertson, M.D. Roper, R.J. Smith
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom

The EBTF facility will provide enabling infrastructures targeted at the development and testing of novel and compact accelerator technologies, specifically through partnership with industry and aimed at addressing applications in medicine, health, security, energy and industrial processing. The facility has now been implemented at Daresbury Laboratory and the commissioning of the critical accelerator systems has been performed. The facility is now preparing for first exploitation with partnering industries that will be able to utilise the electron beam parameters available on EBTF to either demonstrate new techniques and/or processes or otherwise develop new technologies for future commercial realisation.