Demonstration of a 17-GHz, High-Gradient Accelerator with a Photonic-Band-Gap Structure

Journal Article · Fri Aug 12 04:00:00 EDT 2005 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.95.074801· OSTI ID:20699306

Smirnova, Evgenya I; Kesar, Amit S; Mastovsky, Ivan; Shapiro, Michael A; Temkin, Richard J ^[1]

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1. Plasma Science and Fusion Center, Massachusetts Institute of Technology, 167 Albany Street, Cambridge, Massachusetts 02139 (United States)

We report the testing of a high gradient electron accelerator with a photonic-band-gap (PBG) structure. The photonic-band-gap structure confines a fundamental TM{sub 01}-like accelerating mode, but does not support higher-order modes (HOM). The absence of HOM is a major advantage of the PBG accelerator, since it suppresses dangerous beam instabilities caused by wakefields. The PBG structure was designed as a triangular lattice of metal rods with a missing central rod forming a defect confining the TM{sub 01}-like mode and allowing the electron beam to propagate along the axis. The design frequency of the six-cell structure was 17.14 GHz. The PBG structure was excited by 2 MW, 100 ns pulses. A 16.5 MeV electron beam was transmitted through the PBG accelerator. The observed electron beam energy gain of 1.4 MeV corresponds to an accelerating gradient of 35 MV/m, in excellent agreement with theory.

• OSTI ID: 20699306
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 7 Vol. 95; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ELECTRON BEAMS
GHZ RANGE 01-100
INSTABILITY
KLYSTRONS
MEV RANGE 01-10
MEV RANGE 10-100
PULSES
RF SYSTEMS
TESTING
WAKEFIELD ACCELERATORS