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Public reporting burden for this collection of information is estimated to average 1 hour per response, incluling the time for reviewing instructions, searching existing data sources, gatheuing and maintaining the data needed, and completing and reviewing this collection of Information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY)2 SPONSORING I MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR I MONITOR'S ACRONYM(S)Office of Naval Research ONR One Liberty Center 11. SPONSOR! MONITOR'S REPORT 875 North Randolph St. A conceptual design for a compact megawatt class FEL operating within atmospheric transmission windows is presented. The proposed FEL consists of an optically guided, pinched amplifier configuration driven by an RF linac. The gain length, efficiency, electron pulse slippage and the distance between the wiggler and first relay mirror are determined for a megawatt class design. Of particular concern in the design is the overall length of the optical system, i.e., wiggler length and distance to the first relay mirror. In the present design the wiggler length is -2 meters and the distance between the first relay mirror and the wiggler is determined by the average intensity damage threshold on the mirror. By focusing the electron beam, the optical beam can be pinched upon exiting the wiggler. The pinched optical beam has a reduced Rayleigh length which permits the first relay mirror to be relatively close to the wiggler. By pinching the optical beam and employing grazing incidence the first relay mirror can be located with -3 meters of the wiggler. It is shown that frequency detuning can more than double the FEL efficiency. In addition, electron pulse slippage is shown to be substantially reduced in a high-gain amplifier. NUMBER(S)Arlington
Public reporting burden for this collection of information is estimated to average 1 hour per response, incluling the time for reviewing instructions, searching existing data sources, gatheuing and maintaining the data needed, and completing and reviewing this collection of Information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY)2 SPONSORING I MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR I MONITOR'S ACRONYM(S)Office of Naval Research ONR One Liberty Center 11. SPONSOR! MONITOR'S REPORT 875 North Randolph St. A conceptual design for a compact megawatt class FEL operating within atmospheric transmission windows is presented. The proposed FEL consists of an optically guided, pinched amplifier configuration driven by an RF linac. The gain length, efficiency, electron pulse slippage and the distance between the wiggler and first relay mirror are determined for a megawatt class design. Of particular concern in the design is the overall length of the optical system, i.e., wiggler length and distance to the first relay mirror. In the present design the wiggler length is -2 meters and the distance between the first relay mirror and the wiggler is determined by the average intensity damage threshold on the mirror. By focusing the electron beam, the optical beam can be pinched upon exiting the wiggler. The pinched optical beam has a reduced Rayleigh length which permits the first relay mirror to be relatively close to the wiggler. By pinching the optical beam and employing grazing incidence the first relay mirror can be located with -3 meters of the wiggler. It is shown that frequency detuning can more than double the FEL efficiency. In addition, electron pulse slippage is shown to be substantially reduced in a high-gain amplifier. NUMBER(S)Arlington
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