PAC07 - List of Authors (Tan, C.-Y.)

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Tan, C.-Y.

Paper	Title	Page
FRPMS011	Design of an Electro-Optical Sampling Experiment at the AWA Facility	3901
	J. Ruan, H. Edwards, V. E. Scarpine, C.-Y. Tan, R. Thurman-Keup Fermilab, Batavia, Illinois YL. Li, J. G. Power ANL, Argonne, Illinois T. J. Maxwell Northern Illinois University, DeKalb, Illinois
	Funding: Supported by US DOE The free space electro-optical (EO) sampling technique is a powerful tool for analyzing the longitudinal charge density of an ultrashort e-beam. In this paper, we present experimental results for a laser-based mock-up of the EO experiment* and a design for a beam-based, single-shot, EO sampling experiment using the e-beam from the Argonne Wakefield Accelerator (AWA) RF photoinjector. For the mock-up, a tabletop terahertz experiment is conducted in the AWA laser room. The mock-up uses an IR beam incident on <110> ZnTe crystal to produce a THz pulse via optical rectification. Detection is based on the cross correlation between the THz field and the probe IR laser field in a second <110> ZnTe crystal. Potential application of this technique to the ILC accelerator test facility at Fermilab is also presented. * Yuelin Li, Appl. Phys. Lett. 88, 251108, 2006
FRPMS013	Chromaticity Tracking Using a Phase Modulation Technique	3910
	C.-Y. Tan Fermilab, Batavia, Illinois
	Funding: Operated by Universities Research Association Inc. under Contract No. DE-AC02-76CH03000 with the United States Department of Energy. In the classical chromaticity measurement technique, chromaticity is measured by measuring the change in betatron tune as the the RF frequency is varied. This paper will describe a way of measuring chromaticity: we will phase modulate the RF with a known sine wave and then phase demodulate the betatron frequency . The result is a line in Fourier space which corresponds to the frequency of our sine wave modulation. The peak of this sine wave is proportional to chromaticity. For this technique to work, a tune tracker PLL system is required because it supplies the betatron carrier frequency. This method has been tested in both the SPS and Tevatron and we will show the results here.
FRPMS014	Chromaticity Measurement Using a Continuous Head-Tail Kicking Technique	3916
	C.-Y. Tan Fermilab, Batavia, Illinois V. H. Ranjbar Tech-X, Boulder, Colorado
	Funding: Operated by Universities Research Association Inc. under Contract No. DE-AC02-76CH03000 with the United States Department of Energy. In the classical head-tail chromaticity measurement technique, a single large kick is applied transversely to the beam. The resulting phase difference between the head and the tail is measured and the chromaticity extracted. In the continuous head-tail kicking technique, a very small transverse kick is applied to the beam and the asymptotic phase difference between the head and the tail is found to be a function of chromaticity. The advantage of this method is that since the tune tracker PLL already supplies the small transverse kicks, no extra modulation is required.