| Paper |
Title |
Page |
| MOPC063 |
Characterisation of Electron Bunches from ALICE (ERLP) DC Photoinjector Gun at Two Different Laser Pulse Lengths
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211 |
| |
- Y. M. Saveliev, S. P. Jamison, L. B. Jones, B. D. Muratori
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
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In high-voltage DC photoinjector guns, the laser pulse duration affects the electron bunch characteristics and therefore is an important subject for experimental investigation and in the optimisation of the operation of the gun. Initial experimental study of this effect has been conducted using the Energy Recovery Linac Prototype (ERLP) photoinjector. During the commissioning of its DC photoinjector gun, the electron bunch parameters were measured at two laser pulse durations, ~7ps and ~28ps FWHM. The shorter laser pulse is the intrinsic output of the laser, while the longer pulse was produced with the use of a pulse stacker. The electron bunch parameters that were measured included transverse emittance, correlated and uncorrelated energy spread and bunch length. The experimental results and their comparison with computer simulations are presented and discussed.
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| MOPC073 |
Design of an Upgrade to the ALICE Photocathode Electron Gun
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235 |
| |
- B. L. Militsyn, B. D. Fell, L. B. Jones, J. W. McKenzie, K. J. Middleman
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
- I. Burrows, R. J. Cash
STFC/DL, Daresbury, Warrington, Cheshire
- S. N. Kosolobov, H. E. Scheibler, A. S. Terekhov
ISP, Novosibirsk
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The design of an upgrade to the GaAs photocathode electron gun of the Energy Recovery Linac Prototype (ERLP) at Daresbury Laboratory is presented. This proposed upgrade includes a reduction of the photocathode diameter from 32 to 10 mm and the installation of a dedicated photocathode preparation system with side loading of the photocathodes. The preparation system forms a united vacuum system with the gun but is separated by a gate valve. This allows for significant improvements to the vacuum conditions in the gun and a reduction of pollution from caesium vapour which improves gun stability under high voltage. This preparation facility will reduce the time taken for photocathode changeover from weeks to hours. The facility should provide photocathodes with higher quantum efficiency due to a more controllable preparation procedure and allows experiments to be performed with photocathodes activated to different levels of electron affinity.
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