Abstract
For the high gain operation of a SASE FEL, extremely short electron bunches are essential to generate sufficiently high peak currents. At the superconducting linac of FLASH at DESY, we have installed an electro- optic measurement system to probe the time structure of the electric field of single ~100 fs electron bunches. In this technique, the field induced birefringence in an electro-optic crystal is encoded on a chirped picosecond laser pulse. The longitudinal electric field profile of the electron bunch is then obtained from the encoded optical pulse by a single shot cross correlation with a 35 fs laser pulse using a second harmonic crystal (temporal decoding). An electro-optical signal exhibiting a feature with 118 fs FWHM was observed, and this is close to the limit of resolution due to the material properties of the particular electro-optic crystal used. The measured electro-optic signals are compared to bunch shapes simultaneously measured with a transverse deflecting cavity.
Original language | English |
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Title of host publication | Proceedings of DIPAC 2007 |
Editors | Ivan Andrian, Volker R. W. Schaa |
Publisher | DIPAC |
Pages | 221-223 |
Number of pages | 3 |
Publication status | Published - 31 Oct 2008 |
Event | 8th European Workshop on Beam Diagnostics and Instrumentation for Particle Accelerators - NH Laguna Palace, Venice, Italy Duration: 20 May 2007 → 23 May 2007 Conference number: 8 http://accelconf.web.cern.ch/AccelConf/d07/index.htm |
Workshop
Workshop | 8th European Workshop on Beam Diagnostics and Instrumentation for Particle Accelerators |
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Abbreviated title | DIPAC 2007 |
Country/Territory | Italy |
City | Venice |
Period | 20/05/07 → 23/05/07 |
Internet address |
Keywords
- Electro-optic
- Electron bunch diagnostics