Multi-Mode Cavity Accelerator Structure

Technical Report · Thu Nov 10 00:00:00 EST 2016

DOI:https://doi.org/10.2172/1331600· OSTI ID:1331600

Jiang, Yong ^[1]; Hirshfield, Jay Leonard ^[2]

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1. Yale Univ., New Haven, CT (United States)
2. Omega-P R&D, Inc., New Haven, CT (United States)

This project aimed to develop a prototype for a novel accelerator structure comprising coupled cavities that are tuned to support modes with harmonically-related eigenfrequencies, with the goal of reaching an acceleration gradient >200 MeV/m and a breakdown rate <10^-7/pulse/meter. Phase I involved computations, design, and preliminary engineering of a prototype multi-harmonic cavity accelerator structure; plus tests of a bimodal cavity. A computational procedure was used to design an optimized profile for a bimodal cavity with high shunt impedance and low surface fields to maximize the reduction in temperature rise ΔT. This cavity supports the TM010 mode and its 2nd harmonic TM011 mode. Its fundamental frequency is at 12 GHz, to benchmark against the empirical criteria proposed within the worldwide High Gradient collaboration for X-band copper structures; namely, a surface electric field E_sur^max< 260 MV/m and pulsed surface heating ΔT^max< 56 °K. With optimized geometry, amplitude and relative phase of the two modes, reductions are found in surface pulsed heating, modified Poynting vector, and total RF power—as compared with operation at the same acceleration gradient using only the fundamental mode.

• Research Organization: Omega-P R&D, Inc., New Haven, CT (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Contributing Organization: Omega-P R&D, Inc.
• DOE Contract Number: SC0013886
• OSTI ID: 1331600
• Report Number(s): DOE-Omega-P R&D, Inc.-13886; TRN: US1700505
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
CAVITY RESONATORS
COUPLING
ACCELERATORS
SURFACES
PULSES
COMPARATIVE EVALUATIONS
GHZ RANGE 01-100
ACCELERATION
DESIGN
CONFIGURATION
HEATING
COMPUTER CALCULATIONS
ELECTRIC FIELDS
POYNTING THEOREM
AMPLITUDES
BENCHMARKS
EIGENFREQUENCY
ENGINEERING
OPERATION
TESTING
HARMONICS
ENERGY CONSERVATION