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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Limborg-Deprey, C. Emma, P. |
| Copyright Year | 2005 |
| Description | Author affiliation: MS 18, SLAC 2575 Sand Hill Road, Menlo Park CA, U.S.A. limborg@slac.stanford.edu (Limborg-Deprey, C.) |
| Abstract | The Linac Coherent Light Source (LCLS) is an x-ray free-electron laser (FEL) project based on the SLAC linac. The LCLS Photoinjector beamline has been designed to deliver 10-ps long electron bunches of 1 nC with a normalized projected transverse emittance smaller than 1.2 mm-mrad at 135 MeV. Tolerances and regulation requirements are tight for this tuning. Half of the total emittance at the end of the injector comes from the “cathode emittance” which is 0.7 mm-mrad for our nominal 1nC tuning. As the “cathode emittance” scales linearly with laser spot radius, the emittance will be dramatically reduced for smaller radius, but this is only possible at lower charge. In particular, for a 0.2 nC charge, we believe we can achieve an emittance closer to 0.4 mm-mrad. This working point will be easier to tune and the beam quality should be much easier to maintain than for the 1 nC case. In the second half of this paper, we discuss optimum laser pulse shapes. We demonstrate that the benefits of the ellipsoidal shapes seem to be important enough so that serious investigations should be carried out in the production of such pulses. |
| Starting Page | 2140 |
| Ending Page | 2142 |
| File Size | 242426 |
| Page Count | 3 |
| File Format | |
| ISBN | 0780388593 |
| DOI | 10.1109/PAC.2005.1591036 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2005-05-16 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Linear particle accelerator Light sources Laser tuning Free electron lasers X-ray lasers Shape Electron beams Electron emission Laser beams Optical pulse shaping |
| Content Type | Text |
| Resource Type | Article |
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