Beam tuning and bunch length measurement in the bunch compression operation at the cERL

Honda, Y.; Shimada, Miho; Miyajima, Tsukasa; Hotei, Takahiro; Nakamura, Norio; Kato, R.; Obina, T.; Takai, Ryota; Harada, Kentaro; Ueda, Akira

doi:10.1016/j.nima.2017.09.027

Cited by 9 publications

(3 citation statements)

References 14 publications

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“…We also confirmed that the achromat condition was retained while the R 56 knobs were being changed. From the symmetric design of the arc, the transverse dispersion at the center of the arc η c and the R 56 of the arc are related by R 56 = 1.414η c − 0.34 [m], in the present case [45]. By measuring η c , the R 56 of the arc can be estimated indirectly.…”

Section: Application Demonstration Setupmentioning

confidence: 96%

“…We used coherent radiation as an indirect tool to evaluate the bunch length. A terahertz interferometer system using coherent transition radiation (CTR) was developed approximately 10 m upstream of the FEL undulator in the same straight section [45]. By detecting the autocorrelation with a Michelson interferometer, the spectrum of the bunch can be obtained.…”

Section: Application Demonstration Setupmentioning

confidence: 99%

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Construction and Commissioning of Mid-Infrared SASE FEL at cERL

Honda¹,

Adachi²,

Eguchi³

et al. 2021

Preprint

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The mid-infrared range is an important spectrum range where materials exhibit a characteristic response corresponding to their molecular structure. A free-electron laser (FEL) is a promising candidate for a high-power light source with wavelength tunability to investigate the nonlinear response of materials. Although the self-amplification spontaneous emission (SASE) scheme is not usually adopted in the mid-infrared wavelength range, it may have advantages such as layout simplicity, the possibility of producing a single pulse, and scalability to a short-wavelength facility. To demonstrate the operation of a mid-infrared SASE FEL system in an energy recovery linac (ERL) layout, we constructed an SASE FEL setup in cERL, a test facility of the superconducting linac with the ERL configuration. Despite the adverse circumstance of space charge effects due to the given boundary condition of the facility, we successfully established the beam condition at the undulators, and observed FEL emission at a wavelength of 20 µm. The results show that the layout of cERL has the potential for serving as a mid-infrared light source.

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Section: Application Demonstration Setupmentioning

confidence: 96%

Section: Application Demonstration Setupmentioning

confidence: 99%

Construction and Commissioning of Mid-Infrared SASE FEL at cERL

Honda¹,

Adachi²,

Eguchi³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Other well-known techniques to perform bunch length measurements are: (i) the streak camera: a high time resolution camera (based on the use of a photo-multiplier and a rapidly changing electric field) collects the light from a specific screen (e.g. an Optical Transition Radiation screen) which produces a light pulse of the same length as the electron bunch 20 ; (ii) Electro-Optical Sampling (EOS), which uses an external laser that passes through a non linear crystal parallel to the beam, to measure the polarization modulation on the laser pulse due to the electric field associated with the bunch 21 , 22 ; (iii) spectral analysis of the bunch frequency content; the bunch length is assessed by analyzing the frequency spectrum of coherent emission from the bunch 23 – 27 , and (iv) the measurement of the beam energy spread when using an accelerating cavity not on the RF crest 28 – 30 .…”

Section: Introductionmentioning

confidence: 99%

Enhancing particle bunch-length measurements based on Radio Frequency Deflector by the use of focusing elements

Arpaïa

Corsini

Gilardi

et al. 2020

Sci Rep

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A method to monitor the length of a particle bunch, based on the combination of a Radio frequency Deflector (RFD) with magnetic focusing elements, is presented. With respect to state-of-the-art bunch length measurement, the additional focusing element allows to measure also the correlations between the longitudinal and transverse planes in terms of both position and divergence. furthermore, the quadrupole-based focusing increases the input dynamic range of the measurement system (i.e. allows for a larger range of beam Twiss parameters at the entrance of the RFD). Thus, measurement resolution and precision are enhanced, by simultaneously preserving the accuracy. In this paper, the method is first introduced analytically, and then validated in simulation, by the reference tool eLectron Generation And tracking, eLeGAnt. finally, a preliminary experimental validation at CLEAR (CERN Linear Electron Accelerator for Research) is reported.

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Construction and commissioning of mid-infrared self-amplified spontaneous emission free-electron laser at compact energy recovery linac

Honda

Adachi

Eguchi

et al. 2021

Review of Scientific Instruments

View full text Add to dashboard Cite

The mid-infrared range is an important spectrum range where materials exhibit a characteristic response corresponding to their molecular structure. A free-electron laser (FEL) is a promising candidate for a high-power light source with wavelength tunability to investigate the nonlinear response of materials. Although the self-amplification spontaneous emission (SASE) scheme is not usually adopted in the mid-infrared wavelength range, it may have advantages such as layout simplicity, the possibility of producing a single pulse, and scalability to a short-wavelength facility. To demonstrate the operation of a mid-infrared SASE FEL system in an energy recovery linac (ERL) layout, we constructed an SASE FEL setup in cERL, a test facility of the superconducting linac with the ERL configuration. Despite the adverse circumstance of space charge effects due to the given boundary condition of the facility, we successfully established the beam condition at the undulators and observed FEL emission at a wavelength of 20 μm. The results show that the layout of cERL has the potential for serving as a mid-infrared light source.

show abstract

Beam tuning and bunch length measurement in the bunch compression operation at the cERL

Cited by 9 publications

References 14 publications

Construction and Commissioning of Mid-Infrared SASE FEL at cERL

Construction and Commissioning of Mid-Infrared SASE FEL at cERL

Enhancing particle bunch-length measurements based on Radio Frequency Deflector by the use of focusing elements

Construction and commissioning of mid-infrared self-amplified spontaneous emission free-electron laser at compact energy recovery linac

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