Theoretical and experimental analysis of a linear accelerator endowed with single feed coupler with movable short-circuit

Journal Article · Fri Nov 15 04:00:00 EST 2013 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4827080· OSTI ID:22220330

Forno, Massimo Dal ^[1]; Craievich, Paolo ^[1]; Penco, Giuseppe ^[1]; Vescovo, Roberto ^[2]

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1. Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Trieste (Italy)
2. Department of Engineering and Architecture, University of Trieste, Trieste (Italy)

The front-end injection systems of the FERMI@Elettra linac produce high brightness electron beams that define the performance of the Free Electron Laser. The photoinjector mainly consists of the radiofrequency (rf) gun and of two S-band rf structures which accelerate the beam. Accelerating structures endowed with a single feed coupler cause deflection and degradation of the electron beam properties, due to the asymmetry of the electromagnetic field. In this paper, a new type of single feed structure with movable short-circuit is proposed. It has the advantage of having only one waveguide input, but we propose a novel design where the dipolar component is reduced. Moreover, the racetrack geometry allows to reduce the quadrupolar component. This paper presents the microwave design and the analysis of the particle motion inside the linac. A prototype has been machined at the Elettra facility to verify the new coupler design and the rf field has been measured by adopting the bead-pull method. The results are here presented, showing good agreement with the expectations.

• OSTI ID: 22220330
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 11 Vol. 84; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ASYMMETRY
DESIGN
ELECTRICAL FAULTS
ELECTROMAGNETIC FIELDS
ELECTRON BEAMS
FREE ELECTRON LASERS
GEOMETRY
LINEAR ACCELERATORS
MICROWAVE RADIATION
PERFORMANCE
RADIOWAVE RADIATION
RF SYSTEMS
WAVEGUIDES