Novel RF Couplers with Double Windows Design for the ILC

Award Information
Agency: Department of Energy
Branch: N/A
Contract: DE-FG02-07ER84851
Agency Tracking Number: 82780
Amount: $99,995.00
Phase: Phase I
Program: SBIR
Awards Year: 2007
Solicitation Year: 2007
Solicitation Topic Code: 30
Solicitation Number: DE-PS02-06ER06-30
Small Business Information
Amac International, Inc.
12050 Jefferson Avenue Suite 328, Newport News, VA, 23606
DUNS: 166694831
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: Y
Principal Investigator
 Quansheng Shu
 Dr
 (757) 249-3595
 qsshu@amacintl.com
Business Contact
 Ian Phipps
Title: Dr
Phone: (757) 249-3595
Email: ianp@amacintl.com
Research Institution
N/A
Abstract
The ILC accelerator project will require several thousand superconducting radio frequency (RF) cavities with critical RF Input Couplers. These cavities require ultra-clean vacuum and surface cleanness; however, the breakage of a ceramic RF coupler window, with the consequent inrushing of air and contaminants, can have catastrophic effects on performance, and would require a time consuming and expensive overhaul of the accelerator. To eliminate or minimize this potential risk, the large particle accelerators are increasingly requiring a double windows design with a vacuum space between the two windows. However, the high cost of conventional double windows dictates the need for an innovative coupler design and efficient manufacturing. This project will develop a novel double-window RF coupler design that utilizes a combination of features, including selective capacitive coupling of the inner conductor, the removal of the bellows, and a permanent vacum system for the space between the double windows. In Phase I, the feasibility of the innovative double-window coupler for the ILC will be theoretically calculated for different alternatives, and the optimum solution will be selected for Phase II. In Phase II, a prototype coupler for the ILC will be designed, fabricated, and tested with high RF power. Commercial Applications and other Benefits as described by the awardee: Cost effective, operationally reliable, and system-simplified RF coupler designs should find wide use for many DOE projects besides the ILC. The technologies should have a very strong impact on the cost of the RF input couplers and associated equipment for the ILC project, and for the high RF products industry.

* information listed above is at the time of submission.

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