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TUOANO03 |
Bunch Profile Measurement of the LCLS Electron Beam via Mid-IR Spectroscopy |
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- T.J. Maxwell, Y. Ding, A.S. Fisher, J.C. Frisch, H. Loos
SLAC, Menlo Park, California, USA
- C. Behrens
DESY, Hamburg, Germany
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Funding: Work supported by US Department of Energy contract number DE-AC02-76SF00515.
For the generation of ultrashort x-ray FEL pulses, a similarly short, high-brightness electron beam is needed with compression tuned to the extent that a narrow energy spread can still be preserved. Further reduction of the nominal LCLS bunch length by lowering the bunch charge or employing an upstream, emittance-spoiling foil promises to reduce the pulse duration to the level of only a few femtoseconds, presenting a challenge to the temporal resolution of existing longitudinal diagnostics. In answer to this, we have recently commissioned a single-shot, middle-infrared spectrometer for the LCLS. Developed as a robust and cost-effective alternative to other femtosecond-scale beam diagnostics, coherent mid-IR beam radiation measurements and analysis are then employed to probe the LCLS beam just prior to the undulator. Results resolving beam structure to the few-fs level for 20 - 150 pC beams will be presented. Practical design challenges and diagnostic limitations will also be discussed.
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Slides TUOANO03 [2.337 MB]
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TUOBNO04 |
Femtosecond Electron and X-ray Beam Temporal Diagnostics Using an X-band Transverse Deflector at LCLS |
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- Y. Ding, C. Behrens, J.C. Frisch, Z. Huang, P. Krejcik, H. Loos, T.J. Maxwell, J.W. Wang, M.-H. Wang, J.J. Welch
SLAC, Menlo Park, California, USA
- C. Behrens
DESY, Hamburg, Germany
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X-ray free-electron lasers provide ultrashort x-ray pulses for multidisciplinary users. Temporal characterization of these ultrashort pulses with a femtosecond precision remains a challenging topic. At the Linac Coherent Light Source (LCLS), an X-band radio-frequency transverse deflector proposed in 2011 [*] has just been installed and commissioning of the RF system has started. By measuring the electron beam longitudinal phase space between lasing and non-lasing conditions, both the e-beam and x-ray temporal profiles can be reconstructed. We report the latest progress of the commissioning of the deflector and the measurements on the e-beam and x-ray pulse length with this deflector at LCLS. The resolution, stability and operational performance will also be discussed.
[*] Y. Ding et al., Phys. Rev. ST Accel. Beams 14, 120701 (2011)
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Slides TUOBNO04 [4.086 MB]
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TUOBNO04 |
Femtosecond Electron and X-ray Beam Temporal Diagnostics Using an X-band Transverse Deflector at LCLS |
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| |
- Y. Ding, C. Behrens, J.C. Frisch, Z. Huang, P. Krejcik, H. Loos, T.J. Maxwell, J.W. Wang, M.-H. Wang, J.J. Welch
SLAC, Menlo Park, California, USA
- C. Behrens
DESY, Hamburg, Germany
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X-ray free-electron lasers provide ultrashort x-ray pulses for multidisciplinary users. Temporal characterization of these ultrashort pulses with a femtosecond precision remains a challenging topic. At the Linac Coherent Light Source (LCLS), an X-band radio-frequency transverse deflector proposed in 2011 [*] has just been installed and commissioning of the RF system has started. By measuring the electron beam longitudinal phase space between lasing and non-lasing conditions, both the e-beam and x-ray temporal profiles can be reconstructed. We report the latest progress of the commissioning of the deflector and the measurements on the e-beam and x-ray pulse length with this deflector at LCLS. The resolution, stability and operational performance will also be discussed.
[*] Y. Ding et al., Phys. Rev. ST Accel. Beams 14, 120701 (2011)
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Slides TUOBNO04 [4.086 MB]
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