Relative bunch length monitor for the Linac Coherent Light Source (LCLS) using coherent edge radiation

Loos, H.; Borden, T.; Emma, P.; Frisch, J.; Wu, Juhao

doi:10.1109/pac.2007.4440076

Cited by 14 publications

(28 citation statements)

References 3 publications

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“…The FERMI relative BLM design [28] is based on the LCLS BLM system [29] . The first BLM station has been installed downstream the first bunch magnetic chicane (BC1) of FERMI.…”

Section: The Relative Blmmentioning

confidence: 99%

How the optical timing system, the longitudinal diagnostics and the associated feedback systems provide femtosecond stable operation at the FERMI free electron laser

Ferianis

Allaria

Gaio

et al. 2016

High Pow Laser Sci Eng

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FERMI, the seeded free electron laser (FEL) in operation in Italy, is providing the User Community with unique fully coherent radiation, in the wavelength range 100-4 nm. FERMI is the first FEL fully synchronized by means of optical fibers. The optical timing system ensures an ultra-stable phase reference to its distributed clients. Several femtosecond longitudinal diagnostics verify the achieved performance; the bunch length monitor (BLM) and the bunch arrival monitor (BAM) will be presented in this paper. Feedback systems play a crucial role to guarantee the needed longterm electron beam stability. A real-time infrastructure allows shot-to-shot communication between front-end computers and the servers. Orbit feedbacks are useful in machine tuning, whereas longitudinal feedbacks control electron energy, compression and arrival time. A flexible software framework allows a rapid implementation of heterogeneous multiinput-multi-output (MIMO) longitudinal loops simply by selecting the appropriate sensors and actuators.

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“…The FERMI relative BLM design [28] is based on the LCLS BLM system [29] . The first BLM station has been installed downstream the first bunch magnetic chicane (BC1) of FERMI.…”

Section: The Relative Blmmentioning

confidence: 99%

How the optical timing system, the longitudinal diagnostics and the associated feedback systems provide femtosecond stable operation at the FERMI free electron laser

Ferianis

Allaria

Gaio

et al. 2016

High Pow Laser Sci Eng

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“…The LCLS relative bunch length monitors 13 are based on coherent edge radiation (CER) emitted from the last bend magnet in each bunch compressor chicane which is spectrally integrated by pyroelectric detectors within a certain bandwidth. The radiation is extracted from the vacuum beam pipe via an annular mirror to pass the electron beam through and hence provides a non-intercepting relative bunch length measurement used for the longitudinal feedback system.…”

Section: Coherent Radiation Bunch Length Monitormentioning

confidence: 99%

LCLS accelerator operation and measurement of electron beam parameters relevant for the X-ray beam

Loos

2013

SPIE Proceedings

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The Linac Coherent Light Source (LCLS) as the world's first hard x-ray free electron laser in the range of 250 eV to 10 keV at its fundamental wavelength has been operated as a user facility since 2009 with six experimental stations and an increasing range of x-ray beam parameters now available to users. Various aspects of operating the LCLS accelerator to deliver the necessary electron beam in terms of bunch charge, energy, and length for the wide parameter range and different FEL operating modes will be discussed. An emphasis will be on the electron beam diagnostics that are most critical for generating the desired x-ray beam properties. Measurements of electron beam energy, energy loss, and transverse orbit will be shown as well as bunch duration and shape measurements.

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“…A relativistic beam impinges a metal foil at 45 degrees and the radiation is collected and focused onto an image plane at 90 degrees relative to the beam orbit. While there are computer codes available to calculate the electric field at the focus [1,2], it is desirable to have a simple theory that would allow a quick estimate of the fields and provide scaling relations between the beam parameters and those of the radiation. The goal of this paper is to develop such a theory.…”

Section: Introductionmentioning

confidence: 99%

Electric Field Generated by Transition Radiation of a Short Bunch

Stupakov¹

2013

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Relative bunch length monitor for the Linac Coherent Light Source (LCLS) using coherent edge radiation

Cited by 14 publications

References 3 publications

How the optical timing system, the longitudinal diagnostics and the associated feedback systems provide femtosecond stable operation at the FERMI free electron laser

How the optical timing system, the longitudinal diagnostics and the associated feedback systems provide femtosecond stable operation at the FERMI free electron laser

LCLS accelerator operation and measurement of electron beam parameters relevant for the X-ray beam

Electric Field Generated by Transition Radiation of a Short Bunch

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