Development of a Superconducting RF Crabbing System based on a Quarter Wave Resonator for Ultrashort Pulses at Light Sources

Award Information
Agency: Department of Energy
Branch: N/A
Contract: DE-FG02-12ER90257
Agency Tracking Number: 98793
Amount: $150,000.00
Phase: Phase I
Program: SBIR
Awards Year: 2012
Solicitation Year: 2012
Solicitation Topic Code: 10 c
Solicitation Number: DE-FOA-0000577
Small Business Information
1012 N. Walnut St., Lansing, MI, -
DUNS: 621290001
HUBZone Owned: Y
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Chase Boulware
 (803) 840-2303
Business Contact
 Jerry Hollister
Title: Dr.
Phone: (517) 230-7417
Research Institution
Many lines of research currently ongoing at storage ring light sources would benefit from intense, tunable, few picoseconds x-ray pulses for time-domain experiments. The use of a deflecting cavity has several advantages over other proposals to produce these pulses. A crab cavity does not accelerate the bunch, but instead deflects the head of the bunch relative to the tail. This kind of chirp in the transverse momentum imposes an angle-time correlation on the light emitted from the undulator that can be used for time-domain experiments or manipulated with proper x-ray optics to produce ps-scale x-ray pulses. This SBIR proposal seeks to develop a superconducting crab cavity for this use in light sources. Here, a quarter-wave geometry is proposed that operates in the fundamental resonant mode, unlike the more conventional elliptical cavities that have been used for this application, which operate on a higher-order mode and require dampers for the fundamental mode. Further, the quarter-wave geometry has a very different spectrum of higher-order modes than elliptical shapes. Taking advantage of this sparse mode spectrum, an innovative design is proposed with a large beam pipe to allow all higher-order modes to propagate to absorbers at room temperature outside the cryomodule. The quarter wave structure is also efficient and compact, often relevant considerations for crabbing cavities.

* Information listed above is at the time of submission. *

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