Beam Pipe HOM Absorber for 750 MHz RF Cavity Systems

Award Information
Agency: Department of Energy
Branch: N/A
Contract: DE-FG02-09ER85248
Agency Tracking Number: 90047
Amount: $100,000.00
Phase: Phase I
Program: SBIR
Awards Year: 2009
Solicitation Year: 2010
Solicitation Topic Code: 04 b
Solicitation Number: DE-FOA-0000350
Small Business Information
552 N. Batavia Avenue, Batavia, IL, 60510
DUNS: 117921259
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Michael Neubauer
 (707) 360-5038
Business Contact
 Thomas Roberts
Title: Dr.
Phone: (630) 840-2424
Research Institution
Superconducting RF (SRF) systems, used in storage ring and linac applications at DOE facilities, typically contain unwanted frequencies or higher order modes (HOM) that must be absorbed by ferrite and other lossy ceramic-like materials. These materials are brazed to substrates that are strategically located and mechanically attached, often to the drift tube adjacent to the SRF cavity. However, the ferrites and their attachments weaken under tensile and thermal stresses and tend to crack. This project will develop an improved HOM absorber for high-gradient 750 MHz superconducting cavity systems. The work will build on novel construction techniques developed earlier at the SLAC B-factory. In Phase I, numerical modeling will be used to determine the optimum ferrite load required to meet broadband loss specifications. Prototype structures will be fabricated and tested for mechanical strength. Attachment techniques to the metal substrates will range from full compression rings to stress-free ferrite assemblies. Commercial Applications and other Benefits as described by the awardee Better attachment techniques for dissimilar materials, such as ferrite bonding to a metal substrate, are needed for many microwave applications where thermal heat transfer is critical and where a great difference between assembly temperature and operating temperatures exist.

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

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