Accession Number : ADA195169

Title :   A Transition Radiation Experiment to Measure the Electron Beam Modulation Induced by the Free Electron Laser: A Design Study.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Joynson, Jack E

PDF Url : ADA195169

Report Date : Dec 1987

Pagination or Media Count : 90

Abstract : The modulated beam of the free electron laser when passed through a thin target should produce strong transition radiation. The measurement of the transition radiation is a direct measurement of the electron beam modulation in the free electron laser A transition radiation experiment using the Stanford MKIII Infrared Free Electron Laser (IRFEL) has been proposed. The analysis has centered on TRANSPORT, a computer program used for designing charged particle beam systems. The MKIII IRFEL wiggler exit bending magnet system was modeled using TRANSPORT. Analysis reveals that the transverse emittance and momentum spread characteristics will cause the modulated beam to demodulate along the path of the central trajectory. A detector location 10 millimeters downstream of the first bending magnet is found suitable for the measurement of the electron beam modulation. For this case the thin foil must be rotated approximately 11.25 degrees about the y axis to yield a minimum effective picobunch extent as seen by the thin foil. Alternate FEL systems are suggested for investigation. Keywords: Electron beam diagnostics; Electron beams; Modulated beam; Theses.

Descriptors :   *FREE ELECTRON LASERS, BENDING, CHARGED PARTICLES, COMPUTER PROGRAMS, ELECTRON BEAMS, EMITTANCE, INFRARED LASERS, MAGNETS, MEASUREMENT, MODULATION, PARTICLE BEAMS, RADIATION, TARGETS, THESES, THINNESS, TRAJECTORIES, TRANSITIONS, TRANSVERSE, YIELD, OPTICAL DETECTORS, ELECTRON TRANSPORT

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE