PAC07 - List of Authors (Babzien, M.)

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Babzien, M.

Paper	Title	Page
MOPAS103	Optical Parametric Amplifier Test for Optical Stochastic Cooling of RHIC	667
	I. Pavlishin, M. Babzien, I. Pogorelsky, D. Stolyarov, V. Yakimenko BNL, Upton, Long Island, New York M. S. Zolotorev LBNL, Berkeley, California
	Funding: Work supported by US Department of Energy contract DE-AC02-98CH10886 Optical stochastic cooling for the Relativistic Heavy Ion Collider (RHIC) based on optical parametric amplification was proposed by M. Babzien et al., Phys. Rev. ST Accel. Beams v.7, 012801, (2004). According to this proposal a CdGeAs2 nonlinear crystal is used as an active medium for the optical parametric amplifier because of extremely large nonlinear coefficient, wide transparency range, and possibility to be phase matched over the required spectral range. We discuss experimental results of the parametric amplifier gain and coherency for the conditions applicable to optical stochastic cooling for RHIC.
TUPMS033	Chicane Radiation Measurements with a Compressed Electron Beam at the BNL ATF	1254
	G. Andonian, R. B. Agustsson, A. M. Cook, M. P. Dunning, E. Hemsing, A. Y. Murokh, S. Reiche, J. B. Rosenzweig UCLA, Los Angeles, California M. Babzien, K. Kusche, R. Malone, V. Yakimenko BNL, Upton, Long Island, New York
	The radiation emitted from a chicane compressor has been studied at the Brookhaven National Laboratory (BNL) Accelerator Test Facility (ATF). Coherent edge radiation (CER)is emitted from a compressed electron beam as it traverses sharp edge regions of a magnet. The compression is accompanied by strong self-fields, which are manifested as distortions in the momentum space called beam bifurcation. Recent measurements indicate that the bunch length is approximately 100 fs rms. The emitted THz chicane radiation displays strong signatures of CER. This paper reports on the experimental characterization and subsequent analysis of the chicane radiation measurements at the BNL ATF with a discussion of diagnostics development and implementation. The characterization includes spectral analysis, far-field intensity distribution, and polarization effects. Experimental data is benchmarked to a custom developed start-to-end simulation suite.
TUPMS034	Seeded VISA: A 1064 nm Laser-Seeded FEL Amplifier at the BNL ATF	1257
	M. P. Dunning, G. Andonian, E. Hemsing, S. Reiche, J. B. Rosenzweig UCLA, Los Angeles, California M. Babzien, V. Yakimenko BNL, Upton, Long Island, New York
	An experimental study of a seeded free electron laser (FEL) using the VISA undulator and a Nd:YAG seed laser will be performed at the Accelerator Test Facility at Brookhaven National Laboratory. The study is motivated by the demand for a short Rayleigh length FEL amplifier at 1 micron for high power transmission with minimal damage of transport optics. Planned measurements include transverse and longitudinal coherence, angular distribution, and wavelength spectrum of the FEL radiation. The effects of detuning the electron beam energy will be studied, with an emphasis on control of the radiation emission angles and increase of the amplifier efficiency. Results of start-to-end simulations will be presented with preliminary experimental results.
TUPMS036	Characterization of Orbital Angular Momentum Modes in FEL Radiation	1263
	E. Hemsing, G. Andonian, J. B. Rosenzweig UCLA, Los Angeles, California M. Babzien, V. Yakimenko BNL, Upton, Long Island, New York A. Gover University of Tel-Aviv, Faculty of Engineering, Tel-Aviv
	Optical guiding of the radiation pulse through the source electron bunch in a free-electron laser is a well known phenomena that suppresses diffraction of the output radiation, and thus enhances the gain. The resulting radiation can be described by an expansion of orthogonal modes that are also composed of eigenstates of orbital angular momentum (OAM). In the VISA-FEL experiment at the ATF-BNL, gain guiding has been observed under self-amplified spontaneous emission conditions at 840 nm with a strongly chirped input electron beam. The resulting far-field transverse radiation profiles are observed to contain multiple modes in the angular intensity spectrum, and exhibit both hollow and spiral structures characteristic of single or multiply interfering OAM modes. Current efforts to characterize the transverse radiation profile both experimentally and through start-to-end simulations are presented.
THPMS034	Generation and Characterization of the Microbunched Beams with a Wire Mesh Target	3079
	P. Muggli, E. Kallos USC, Los Angeles, California M. Babzien, K. Kusche, V. Yakimenko BNL, Upton, Long Island, New York W. D. Kimura STI, Washington
	Funding: Work supported by US Department of Energy contract DE-AC02-98CH10886 The presentation will cover experimental results on generation and measurement of the beams with theμbunches length from 1 to 50 microns at Brookhaven Accelerator Test Facility. Arbitrary number of microbunches is sliced out of 5 ps long beam using wire mesh and slits. The details of beam structure are characterized using CSR interferometer and 6 mm long plasma wakefield channel with the controllable plasma density.
FRPMS059	Generation and Analysis of Subpicosecond Double Electron Bunch at the Brookhaven Accelerator Test Facility	4132
	X. P. Ding, D. B. Cline UCLA, Los Angeles, California M. Babzien, K. Kusche, V. Yakimenko BNL, Upton, Long Island, New York W. D. Kimura STI, Washington F. Zhou SLAC, Menlo Park, California
	Funding: U. S.DOE of Science Two compressed electron beam bunches from a single 60-MeV bunch have been generated in a reproducible manner during compression in the magnetic chicane - "dog leg" arrangement at ATF. Measurements indicate they have comparable bunch lengths (~100-200 fs) and are separated in energy by ~1.8 MeV with the higher-energy bunch preceding the lower-energy bunch by 0.5-1 ps. Some simulation results for analyzing the double-bunch formation process are also presented.