Kumar, V.

Paper	Title	Page
MOBAU04	Optical Klystron Enhancement to SASE X-Ray FELs	29
	Y. T. Ding, P. Emma, Z. Huang SLAC, Menlo Park, California V. Kumar RRCAT, Indore (M. P.)
	The optical klystron enhancement to self-amplified spontaneous emission (SASE) free electron lasers (FELs) is studied in theory and in simulations. In contrast to a seeded FEL, the optical klystron gain in a SASE FEL is not sensitive to any phase mismatch between the radiation and the microbunched electron beam. The FEL performance with the addition of four optical klystrons located at the undulator long breaks in the Linac Coherent Light Source (LCLS) shows significant improvement if the uncorrelated energy spread at the undulator entrance can be controlled to a very small level. In addition, FEL saturation at shorter x-ray wavelengths (around 1.0 angstrom) within the LCLS undulator length becomes possible. We also discuss the application of the optical klystron in a compact x-ray FEL design that employs relatively low electron beam energy together with a shorter-period undulator.
	Slides
	Talk
MOPPH014	Optimization of Parameters of Smith-Purcell BWO	67
	V. Kumar RRCAT, Indore (M. P.) K.-J. Kim ANL, Argonne, Illinois
	We perform a detailed study of the dependence of start current in Smith-Purcell Backward Wave Oscillators (SP-BWO) on grating parameters and electron beam parameters. In our analysis, we include the attenuation due to finite conductivity of the grating material into account and also include three-dimensional effects approximately. We perform numerical simulation to optimize the parameters of an SP-BWO in order to generate intense THz-radiation.
MOPPH015	Analysis of Smith-Purcell BWO with End Reflections	71
	V. Kumar RRCAT, Indore (M. P.) K.-J. Kim ANL, Argonne, Illinois
	All the previous analyses of Smith-Purcell Backward Wave Oscillator (SP-BWO) have assumed that there is no reflection at the end of the grating. We present an analysis of SP-BWO taking the reflection at the end of the grating into account. We study the dependence of start current on end reflection, taking the attenuation due to finite conductivity into account.
TUCAU04	FEL Activities in India	496
	S. Krishnagopal, B. Biswas, S. Chouksey, S. K. Gupta, U. Kale, A. Kumar, V. Kumar, S. Lal, P. Mehta, P. Nerpagar, K. K. Pant RRCAT, Indore (M. P.)
	We are building a Compact Ultrafast Terahertz Free-Electron Laser (CUTE- FEL), designed to lase between 50 - 100 microns. It will be driven by a 15 MeV electron beam from a Plane-Wave Transformer linac. The undulator is a 5 cm period, 2.5 m long, PPM planar undulator. We present details of the FEL design and the present status of activities. We also present very preliminary plans for a short-wavelength SASE FEL in India.
	Slides
	Talk