Absorber for terahertz radiation management
Abstract
A method and apparatus for minimizing the degradation of power in a free electron laser (FEL) generating terahertz (THz) radiation. The method includes inserting an absorber ring in the FEL beam path for absorbing any irregular THz radiation and thus minimizes the degradation of downstream optics and the resulting degradation of the FEL output power. The absorber ring includes an upstream side, a downstream side, and a plurality of wedges spaced radially around the absorber ring. The wedges form a scallop-like feature on the innermost edges of the absorber ring that acts as an apodizer, stopping diffractive focusing of the THz radiation that is not intercepted by the absorber. Spacing between the scallop-like features and the shape of the features approximates the Bartlett apodization function. The absorber ring provides a smooth intensity distribution, rather than one that is peaked on-center, thereby eliminating minor distortion downstream of the absorber.
- Inventors:
- Issue Date:
- Research Org.:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1230013
- Patent Number(s):
- 9209587
- Application Number:
- 14/662,322
- Assignee:
- JEFFERSON SCIENCE ASSOCIATES, LLC
- Patent Classifications (CPCs):
-
G - PHYSICS G21 - NUCLEAR PHYSICS G21K - TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01S - DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT
- DOE Contract Number:
- AC05-06OR23177
- Resource Type:
- Patent
- Resource Relation:
- Patent File Date: 2015 Mar 19
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS; 61 RADIATION PROTECTION AND DOSIMETRY
Citation Formats
Biallas, George Herman, Apeldoorn, Cornelis, Williams, Gwyn P., Benson, Stephen V., Shinn, Michelle D., and Heckman, John D. Absorber for terahertz radiation management. United States: N. p., 2015.
Web.
Biallas, George Herman, Apeldoorn, Cornelis, Williams, Gwyn P., Benson, Stephen V., Shinn, Michelle D., & Heckman, John D. Absorber for terahertz radiation management. United States.
Biallas, George Herman, Apeldoorn, Cornelis, Williams, Gwyn P., Benson, Stephen V., Shinn, Michelle D., and Heckman, John D. Tue .
"Absorber for terahertz radiation management". United States. https://www.osti.gov/servlets/purl/1230013.
@article{osti_1230013,
title = {Absorber for terahertz radiation management},
author = {Biallas, George Herman and Apeldoorn, Cornelis and Williams, Gwyn P. and Benson, Stephen V. and Shinn, Michelle D. and Heckman, John D.},
abstractNote = {A method and apparatus for minimizing the degradation of power in a free electron laser (FEL) generating terahertz (THz) radiation. The method includes inserting an absorber ring in the FEL beam path for absorbing any irregular THz radiation and thus minimizes the degradation of downstream optics and the resulting degradation of the FEL output power. The absorber ring includes an upstream side, a downstream side, and a plurality of wedges spaced radially around the absorber ring. The wedges form a scallop-like feature on the innermost edges of the absorber ring that acts as an apodizer, stopping diffractive focusing of the THz radiation that is not intercepted by the absorber. Spacing between the scallop-like features and the shape of the features approximates the Bartlett apodization function. The absorber ring provides a smooth intensity distribution, rather than one that is peaked on-center, thereby eliminating minor distortion downstream of the absorber.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2015},
month = {12}
}
Works referenced in this record:
Method for absorbing radiation
patent, November 1993
- Giles, Robert H.; Horgan, Thomas M.
- US Patent Document 5,260,513
Terahertz imaging system and associated method
patent, March 2008
- Adamski, John L.
- US Patent Document 7,342,230
Works referencing / citing this record:
Absorber for terahertz radiation management
patent, December 2015
- Biallas, George Herman; Apeldoorn, Cornelis; Williams, Gwyn P.
- US Patent Document 9,209,587