Femtosecond electron bunches from an RF-gun

Rimjaem, S.; Farias, R.H.A.; Thongbai, C.; Vilaithong, T.; Wiedemann, Helmut

doi:10.1016/s0168-9002(04)01439-1

Cited by 11 publications

(7 citation statements)

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“…a flat surface cathode) in our 2998 MHz gun for better electron distribution after bunch compression. Field ratio of this rf gun has been adjusted to two for generation of linear beam distribution in the longitudinal phase space for bunch compression with the alpha magnet down stream [7,8]. The cathode has been activated to 1100 °C in its surface temperature and has been operated at ~950 °C during beam test.…”

Section: The Thermionic Cathode Rf Gunmentioning

confidence: 99%

First operation of a thermionic cathode RF gun at NSRRC

Lee

Chang

Hwang

et al. 2007

2007 IEEE Particle Accelerator Conference (PAC)

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A high brightness injector is being constructed for light source R&D at NSRRC. This 150 MeV beam injector consists of a 1.5-cell thermionic cathode rf gun with field ratio adjusted to produce a linear energy chirped electron beam for generation of sub-picoseconds electron pulses at GHz repetition rate by using alpha-magnet as low energy bunch compressor. This short bunch beam is planned to drive an experimental pre-bunched THz FEL in the near future. High power microwave processing of the thermionic cathde rf gun up to ~4 MW cavity forward power has been achieved. First beam from this gun has been obtained.

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Section: The Thermionic Cathode Rf Gunmentioning

confidence: 99%

First operation of a thermionic cathode RF gun at NSRRC

Lee

Chang

Hwang

et al. 2007

2007 IEEE Particle Accelerator Conference (PAC)

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“…Comparing with expensive and complicated photocathode RF gun, thermionic RF gun with compact and simple structure generates short bunches relying on self-bunching effect of electrons in RF standing-wave fields. According to researches of many institutions recently, thermionic RF gun still has potentials of generating high brightness bunches and compressing bunch length to have sufficient peak current to drive FEL [1,2].…”

Section: Introductionmentioning

confidence: 99%

Physical design of FEL injector based on the performance-enhanced EC-ITC RF gun

Hu¹,

Chen²,

Pei³

et al. 2014

Chinese Phys. C

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Abstract:To meet requirements of high performance THz-FEL (Free Electron Laser), a compact scheme of FEL injector was proposed. Thermionic cathode was chosen to emit electrons instead of photo-cathode with complex structure and high cost. The effective bunch charge was improved to ~200pC by adopting enhanced EC-ITC (External Cathode Independently Tunable Cells) RF gun to extract micro-bunches, and back bombardment effects were almost eliminated as well. Constant gradient accelerator structures were designed to improve energy to ~14MeV, while focusing system was applied for emittance suppressing and bunch state maintenance. Physical design and beam dynamics of key components for FEL injector were analyzed. Furthermore, start-to-end simulations with multi-pulses were performed by using homemade MATLAB and Parmela. The results show that continual high brightness electron bunches with low energy spread and emittance could be obtained stably.

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“…The radiation is broadband and its detectable spectrum reaches from microwaves to 120 cm -1 wavenumber. The FIR radiation brightness of coherent TR estimated for 50 fs electron bunches, expected in the near future at FNRF [3], extending to over 300 cm -1 wavenumber greatly exceeds that of a black body as well as that of synchrotron radiation as shown in Fig. 4.…”

Section: Generation Of Coherent Far-infrared Radiationmentioning

confidence: 86%

“…1, fs electron bunches are generated from a thermionic-cathode and an α-magnet serving as a magnetic bunch compressor. The specially-design RF-gun was studied and constructed [3]. It was designed such that the first particle in each S-band cycle will be exposed to maximum acceleration while any later particles will accumulate less energy.…”

Section: Generation Of Femtosecond Electron Bunchesmentioning

confidence: 99%

Generation of Femtosecond Electron and Photon Pulses

Thongbai

Jinamoon²,

Kangrang³

et al.

Proceedings of the 2005 Particle Accelerator Conference

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Femtosecond (fs) electron and photon pulses become a tool of increasing importance to study dynamics in ultrafast processes. Such short electron pulses can be generated from a system consisting of a thermioniccathode RF-gun and a magnetic bunch compressor. The fs electron pulses can be used directly or used as a source to produce equally short electromagnetic radiation pulses via certain kind of radiation production processes. At the Fast Neutron Research Facility (FNRF), Thailand, we are especially interested in production of radiation in Farinfrared and X-ray regime. In the far-infrared wavelengths, the radiation emitted from fs electron pulses is emitted coherently resulting high intensity radiation. In the X-ray regime, development of fs X-ray sources is crucial for application in ultrafast sciene.

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Femtosecond electron bunches from an RF-gun

Cited by 11 publications

References 0 publications

First operation of a thermionic cathode RF gun at NSRRC

First operation of a thermionic cathode RF gun at NSRRC

Physical design of FEL injector based on the performance-enhanced EC-ITC RF gun

Generation of Femtosecond Electron and Photon Pulses

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