Development of a low-emittance high-current continuous electron source

Toonen, W. F.; Rajabi, A. A.; Berg, Roger; Stragier, X.F.D.; Mutsaers, P.H.A.; Smorenburg, P.W.; Luiten, O.J.

doi:10.1016/j.nima.2021.165678

Cited by 5 publications

(2 citation statements)

References 27 publications

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“…For few cycle pulse generation the requirements are much more stringent: ǫ n ≤ 80 nm-rad for the same mirror waist size and δγ m e c 2 ≤ 0.5 keV. These beam parameters, however, can still be achieved for bunch charges of several pC using a state-of-the-art thermionic gun 41 . Furthermore, we find that laser field strength proposed for the high peak power case (i) approximately corresponds to the critical value for A 0 ≤ 0.1 .…”

Section: Discussionmentioning

confidence: 99%

Isolated attosecond X-ray pulses from superradiant thomson scattering by a relativistic chirped electron mirror

Schaap

Smorenburg

Luiten

2022

Sci Rep

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Time-resolved investigation of electron dynamics relies on the generation of isolated attosecond pulses in the (soft) X-ray regime. Thomson scattering is a source of high energy radiation of increasing prevalence in modern labs, complementing large scale facilities like undulators and X-ray free electron lasers. We propose a scheme to generate isolated attosecond X-ray pulses based on Thomson scattering by colliding microbunched electrons on a chirped laser pulse. The electrons collectively act as a relativistic chirped mirror, which superradiantly reflects the laser pulse into a single localized beat. As such, this technique extends chirped pulse compression, developed for radar and applied in optics, to the X-ray regime. In this paper we theoretically show that, by using this approach, attosecond soft X-ray pulses with GW peak power can be generated from pC electron bunches at tens of MeV electron beam energy. While we propose the generation of few cycle X-ray pulses on a table-top system, the theory is universally scalable over the electromagnetic spectrum.

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Section: Discussionmentioning

confidence: 99%

Isolated attosecond X-ray pulses from superradiant thomson scattering by a relativistic chirped electron mirror

Schaap

Smorenburg

Luiten

2022

Sci Rep

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“…One of the main components of the EBM is the electron source (ES), which generates the electron beam. The use of ES is not only for EBM but also for X-ray radiotherapy (Matejcek et al, 2023), for welding (Xiaomeng et al, 2021), for Electron Linac (Toonen et al, 2021), and microwave tube devices (Iqbal, et.al., 2021). The ES at least consists of a filament, a cathode electrode, an anode electrode, and a vacuum chamber.…”

Section: Introductionmentioning

confidence: 99%

Construction and Characterization of the Diode and Triode Electron Sources for EBM 300 keV/20 mA

Darsono,

Taufik,

Suprapto

et al. 2024

IJTech

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The technical challenge in constructing the electron source (ES) lies in the joining of metal and ceramic tubes. Furthermore, there is a lack of available technical comparison data for the output performance between the diode and triode ES under the same experimental conditions. The research aim is to describe a simple technique for constructing the diode and triode ES for an electron beam machine (EBM) of 300 keV/20 mA, and to investigate their output characteristics. The method used is to make a flange for mounting the Tungsten filament, Pierce electrodes, and heat shield. Two or three electrodes of the NEC (National Electric Corporation) accelerator tube are removed before the flange is united into the NEC tube, becoming the ES. The ES's are investigated in terms of their electron beam profiles and beam current output for the variation of the extraction electrode voltage as well as the focusing electrode voltage. The experimental results show that for the triode ES, the focusing electrode voltage greatly affects the shape of the electron beam profile up to 3 kV. However, for the diode ES, the shape of the electron beam profile is slightly affected by the extraction electrode voltage. The beam current output increases rapidly with the increase of the extraction electrode voltage up to 2.5 kV. Above this voltage, the beam current slowly increases, and it tends to reach saturation. The diode ES provides a higher electron beam current output than the triode ES output, but the triode ES provides a better shape of the electron beam profile. The constructed ES can provide the electron beam current of 40 mA at the filament current of 18 A.

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