Status report on the low-frequency photo-injector and on the infrared FEL experiment (ELSA)

Dei-Cas, R.; Balleyguier, P.; Bertin, A.; Beuve, Michaël; Binet, A.; Bloquet, A.; Bois, R.; Bonetti, C.; Brion, J.P. De; Coçu, F.; Crescenzo, J. Di; Fourdin, P.; Fréhaut, J.; Guilloud, M.; Haouat, G.; Herscovici, A.; Iracane, D.; Joly, R.; Joly, Simon; Jouys, J.C.; Laget, J.P.; Laspalles, C.; Leboutet, H.; Marmouget, J.G.; Masseron, D.; Penquer, Y. De; Pranal, Y.; Sigaud, J.; Striby, S.; Véron, D.; Vouillarmet, J.; Aucouturier, J.; Bensussan, A.; Simon, Mark; Dubrovin, A. N.; Meur, G. Le; Adam, J. C.; Héron, A.

doi:10.1016/0168-9002(90)91211-s

Cited by 17 publications

(2 citation statements)

References 3 publications

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“…Photocathode rf guns [1] allow reaching a very high beam brightness and can find applications as injectors for free-electron lasers, terahertz and Compton sources, and electron diffraction microscopes [2][3][4][5][6][7][8][9][10][11][12][13][14][15]. They are multicell standing wave structures in which the electron beam is generated by photoemission illuminating the cathode surface with a drive-laser pulse.…”

Section: Introductionmentioning

confidence: 99%

Design, realization, and high power test of high gradient, high repetition rate brazing-free S -band photogun

Alesini

Battisti

Bellaveglia

et al. 2018

Phys. Rev. Accel. Beams

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rf photoguns find several types of applications as high brightness electron sources for free-electron lasers, energy recovery linacs, Compton and Thomson sources, and high-energy linear colliders. The high peak current and low transverse emittance of the generated beam are obtained with the combination of a high peak electric field (> 100 MV=m) at the cathode surface, a proper choice of the solenoid field around, or immediately after, the gun, and special fabrication and treatments of the cathode itself. On the other hand, to increase the average electron current, a high repetition rate (> 100 Hz) and/or a multibunch rf gun have to be developed. These types of devices are, in general, fabricated by brazing processes of copper machined parts. The brazing processes require a large vacuum furnace, are very expensive, and pose a not negligible risk of failure. A new fabrication technique for this type of structure has been recently developed and implemented at the Laboratories of Frascati of the National Institute of Nuclear Physics (INFN-LNF, Italy) and already applied to an rf gun now operating at a relatively low cathode peak field and low repetition rate [D. Alesini et al., Phys. Rev. Accel. Beams 18, 092001 (2015)]. It is based on the use of special rf-vacuum gaskets that allow a brazing-free realization process. The S-band gun of the Extreme Light Infrastructure-Nuclear Physics Gamma Beam System, under construction in Magurele (Bucharest, Romania), has been realized with this new technique and represents a further and fundamental step toward the consolidation of this technology for high gradient particle accelerator fabrication. It operates at 100 Hz with a 120 MV=m cathode peak field and 1.5-μs-long rf pulses to house the 32 bunches necessary to reach the target gamma flux. High gradient tests, performed at full power and a full repetition rate, have shown the extremely good performances of the structure in terms of the breakdown rate and conditioning time and definitively demonstrated the reliability and suitability of such fabrication process for high gradient structure realization. In this paper, we report and discuss the electromagnetic and thermomechanical design, the realization process, and all the experimental results at low and high power at a full repetition rate.

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Section: Introductionmentioning

confidence: 99%

Design, realization, and high power test of high gradient, high repetition rate brazing-free S -band photogun

Alesini

Battisti

Bellaveglia

et al. 2018

Phys. Rev. Accel. Beams

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“…This process combined with a proper choice of solenoid field around, or immediately after, the gun, allows reaching very high beam brightness. These devices can find applications as injectors for free-electron lasers (FELs) [1][2][3][4][5][6], terahertz radiation generation [7,8], electron diffraction [9][10][11][12][13] and Compton sources [14].…”

Section: Introductionmentioning

confidence: 99%

New technology based on clamping for high gradient radio frequency photogun

Alesini

Battisti

Ferrario

et al. 2015

Phys. Rev. ST Accel. Beams

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High gradient rf photoguns have been a key development to enable several applications of high quality electron beams. They allow the generation of beams with very high peak current and low transverse emittance, satisfying the tight demands for free-electron lasers, energy recovery linacs, Compton/Thomson sources and high-energy linear colliders. In the present paper we present the design of a new rf photogun recently developed in the framework of the SPARC_LAB photoinjector activities at the laboratories of the National Institute of Nuclear Physics in Frascati (LNF-INFN, Italy). This design implements several new features from the electromagnetic point of view and, more important, a novel technology for its realization that does not involve any brazing process. From the electromagnetic point of view the gun presents high mode separation, low peak surface electric field at the iris and minimized pulsed heating on the coupler. For the realization, we have implemented a novel fabrication design that, avoiding brazing, strongly reduces the cost, the realization time and the risk of failure. Details on the electromagnetic design, low power rf measurements and high power radiofrequency and beam tests performed at the University of California in Los Angeles (UCLA) are discussed in the paper.

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Introduction

Freund¹,

Antonsen²

1992

Principles of Free-Electron Lasers

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Status report on the low-frequency photo-injector and on the infrared FEL experiment (ELSA)

Cited by 17 publications

References 3 publications

Design, realization, and high power test of high gradient, high repetition rate brazing-free S -band photogun

Design, realization, and high power test of high gradient, high repetition rate brazing-free S -band photogun

New technology based on clamping for high gradient radio frequency photogun

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