A rationalized approach to thermionic rf gun design

Beczek, K.; Lewellen, J. W.; Nassiri, A.; Tanabe, Eiji

doi:10.1109/pac.2001.987325

Cited by 6 publications

(3 citation statements)

References 2 publications

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“…The injection system of the Advanced Photon Source (APS) has relied on thermionic cathode (TC) rf guns as electron-beam sources since 2001 [1]. This will continue to be the case for the APS Upgrade with the multi-bend achromatic magnet lattice installation in the 6-GeV storage ring currently in progress [2].…”

Section: Introductionmentioning

confidence: 99%

Microbunching of thermionic cathode rf gun beams in the Advanced Photon Source s-band linac

Dooling,

Brill,

Lobach

et al. 2024

J. Phys.: Conf. Ser.

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We report on measurements of beams from thermionic cathode (TC) rf guns in the Advanced Photon Source S-Band Linac. These measurements include the macropulse out of both new and existing TC guns as well as the observation of microbunching within the micropulses of these beams. A gun chopper limits the macropulse FWHM duration to the 10-ns range. Our objectives were to analyse the new TC gun and investigate microbunching within a TC-rf-gun-generated beam. Our diagnostics elucidated longitudinal beam structures from the ns to the fs time scales. Coherent transition radiation (CTR) interferometers responding to far-infrared wavelengths were employed after each compression stage to provide the autocorrelations of the sub-ps micropulse durations. The first compression stage is an alpha magnet and the second a chicane. A CCD camera was used to image the beam via optical transition radiation from an Al screen at the end of the linac and also employed to measure coherent optical transition radiation (COTR) in the visible range. The COTR diagnostic observations, implying microbunching on a fs time scale, are presented and compared with a longitudinal space-charge impedance model.

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Section: Introductionmentioning

confidence: 99%

Microbunching of thermionic cathode rf gun beams in the Advanced Photon Source s-band linac

Dooling,

Brill,

Lobach

et al. 2024

J. Phys.: Conf. Ser.

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“…The initial implementation allows for the repair and characterization of both the existing [3,4] APS main injector electron guns and new guns using an upgraded design [5]. Testing of guns incorporating up to three cavities has already been planned [6].…”

Section: Introductionmentioning

confidence: 99%

The high-power s-band feed subsystem for the Advanced Photon Source injector test stand

Grelick

Berg

Goeppner

et al.

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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The rf subsystem for the Advanced Photon Source injector test stand is a totally passive system. Waveguide variable power dividers and phase shifters, which are pressurized with SF6, are used to provide three highpower ports that are independently adjustable in phase and amplitude while maintaining negligible differential phase jitter. Either three independent devices or a device requiring three inputs can be tested at any one time.

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“…Finally, the technique had to lend itself to being assembled and reconfigured in a variety of ways quickly and easily. Above all, the method had to allow complete interchangeability of all major beamline components, especially our newly manufactured thermionic-cathode rf electron guns, [2] with their counterparts on each of the two existing gun-to-linac (GTL) transport lines [3,4].…”

Section: Introductionmentioning

confidence: 99%

A versatile method of beamline construction

Beczek

Lewellen²

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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At the Advanced Photon Source (APS), a method for beamline construction has been developed that allows the researcher to reconfigure the beamline quickly and easily. This technique has been extensively incorporated into the APS injector test stand [1]. Rather than use a statically designed system, it was decided at the beginning of the project that an approach that emphasized versatility would provide maximum utility. A concise review of similar previous approaches at APS will be explored, followed by a presentation of this method and other possible variations, with a bias toward fabrication, assembly, and operator considerations.

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A rationalized approach to thermionic rf gun design

Cited by 6 publications

References 2 publications

Microbunching of thermionic cathode rf gun beams in the Advanced Photon Source s-band linac

Microbunching of thermionic cathode rf gun beams in the Advanced Photon Source s-band linac

The high-power s-band feed subsystem for the Advanced Photon Source injector test stand

A versatile method of beamline construction

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