Single-shot electron bunch length measurements using a spatial electro-optical autocorrelation interferometer
- PUBLICA Swiss Federal Pension Fund, CH-3000 Berne (Switzerland)
- General and Theoretical Electrical Engineering (ATE), Faculty of Engineering, University of Duisburg-Essen, D-47048 Duisburg (Germany)
- Department of Large Research Facilities, Paul Scherrer Institute, CH- 5232 Villigen (Switzerland)
- Laboratory for Micro- and Nanotechnology, Paul Scherrer Institute, CH- 5232 Villigen (Switzerland)
- Department of Information Technology and Electrical Engineering, Electronics Laboratory, ETHZ, CH-8092 Zurich (Switzerland)
- Department of Microwave Physics, Institute of Applied Physics, University of Berne, CH-3012 Berne (Switzerland)
A spatial, electro-optical autocorrelation (EOA) interferometer using the vertically polarized lobes of coherent transition radiation (CTR) has been developed as a single-shot electron bunch length monitor at an optical beam port downstream the 100 MeV preinjector LINAC of the Swiss Light Source. This EOA monitor combines the advantages of step-scan interferometers (high temporal resolution) [D. Mihalcea et al., Phys. Rev. ST Accel. Beams 9, 082801 (2006) and T. Takahashi and K. Takami, Infrared Phys. Technol. 51, 363 (2008)] and terahertz-gating technologies [U. Schmidhammer et al., Appl. Phys. B: Lasers Opt. 94, 95 (2009) and B. Steffen et al., Phys. Rev. ST Accel. Beams 12, 032802 (2009)] (fast response), providing the possibility to tune the accelerator with an online bunch length diagnostics. While a proof of principle of the spatial interferometer was achieved by step-scan measurements with far-infrared detectors, the single-shot capability of the monitor has been demonstrated by electro-optical correlation of the spatial CTR interference pattern with fairly long (500 ps) neodymium-doped yttrium aluminum garnet (Nd:YAG) laser pulses in a ZnTe crystal. In single-shot operation, variations of the bunch length between 1.5 and 4 ps due to different phase settings of the LINAC bunching cavities have been measured with subpicosecond time resolution.
- OSTI ID:
- 22058635
- Journal Information:
- Review of Scientific Instruments, Vol. 81, Issue 10; Other Information: (c) 2010 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
43 PARTICLE ACCELERATORS
36 MATERIALS SCIENCE
ALUMINIUM
BEAM BUNCHING
CAVITY RESONATORS
CRYSTALS
DOPED MATERIALS
GARNETS
INTERFEROMETERS
LINEAR ACCELERATORS
MEV RANGE
NEODYMIUM
NEODYMIUM LASERS
PULSES
SWISS LIGHT SOURCE
TIME RESOLUTION
TRANSITION RADIATION
YTTRIUM
ZINC TELLURIDES