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Initial nonintercepting measurements of subpicosecond bunches using coherent diffraction radiation.

DE2001757526

Publication Date	2000
Personal Author	Lumpkin, A. H.; Sereno, N. S.; Decker, G. A.; Rule, D. W.
Page Count	12
Abstract	We report initial measurements of the subpicosecond (sub-ps) bunch structure in a 40-MeV linac beam using the autocorrelation of far infrared (FIR) coherent diffraction radiation (CDR). Since the radiation was generated as the charged particles passed through a slit or aperture in a metal screen oriented at 45 degrees to the beam direction, this is a nonintercepting technique. A compact Michelson interferometer was used to obtain the autocorrelation of the backward CDR with a Golay cell used as the FIR-mm wave detector. The longitudinal shape was calculated from the autocorrelation using the minimal phase approximation. A model as developed and used to calculate the CDR spectral emissions. The experimental results, analysis, and model are presented. Complimentary measurements were also made with coherent transition radiation (CTR).
Keywords	Diffraction Beam bunching Beams Measuring instruments Beam monitoring Coherent radiation Charged particles Interferometers Detectors
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Argonne National Lab., IL.; Department of Energy, Washington, DC.
Document Type	Conference Proceedings
NTIS Issue Number	200123
Contract Number	W-31-109-ENG-38

Initial nonintercepting measurements of subpicosecond bunches using coherent diffraction radiation.

Initial nonintercepting measurements of subpicosecond bunches using coherent diffraction radiation.
DE2001757526

Publication Date	2000
Personal Author	Lumpkin, A. H.; Sereno, N. S.; Decker, G. A.; Rule, D. W.
Page Count	12
Abstract	We report initial measurements of the subpicosecond (sub-ps) bunch structure in a 40-MeV linac beam using the autocorrelation of far infrared (FIR) coherent diffraction radiation (CDR). Since the radiation was generated as the charged particles passed through a slit or aperture in a metal screen oriented at 45 degrees to the beam direction, this is a nonintercepting technique. A compact Michelson interferometer was used to obtain the autocorrelation of the backward CDR with a Golay cell used as the FIR-mm wave detector. The longitudinal shape was calculated from the autocorrelation using the minimal phase approximation. A model as developed and used to calculate the CDR spectral emissions. The experimental results, analysis, and model are presented. Complimentary measurements were also made with coherent transition radiation (CTR).
Keywords	Diffraction Beam bunching Beams Measuring instruments Beam monitoring Coherent radiation Charged particles Interferometers Detectors
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Argonne National Lab., IL.; Department of Energy, Washington, DC.
Document Type	Conference Proceedings
NTIS Issue Number	200123
Contract Number	W-31-109-ENG-38