PAC09 - List of Authors (Irish, E.)

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Irish, E.

Paper	Title	Page
TH6REP033	Interferometer Beam Size Measurements in SPEAR3	4018
	W.J. Corbett, W.X. Cheng, A.S. Fisher, E. Irish SLAC, Menlo Park, California T.M. Mitsuhashi KEK, Ibaraki W.Y. Mok Life Imaging Technology, Palo Alto, California
	Funding: Work sponsored by U.S. Department of Energy Contract DE-AC03-76SF00515 and Office of Basic Energy Sciences, Division of Chemical Sciences. A two-slit interferometer has been installed in the SPEAR3 diagnostic beam line to measure vertical beam size at a dipole source point. The diagnostic beam line accepts unfocused, visible light in a 3.5 x 6.0 mrad aperture so that at the slit location 17 m from the source, the vertical extent of the beam is 100mm. For typical source sizes of sigy~15 um (0.1% emittance coupling) a slit separation of 80 mm produces fringe visibility of order V=0.5. Hence a significant plot of fringe visibility vs. slit separation can be generated to infer source size via Fourier transformation. In this paper we report on the interferometer construction, beam size measurement and potential deficiencies of the system, and compare with theoretical results.

Paper

Title

Page

TH6REP033

Interferometer Beam Size Measurements in SPEAR3

4018

W.J. Corbett, W.X. Cheng, A.S. Fisher, E. Irish
SLAC, Menlo Park, California
T.M. Mitsuhashi
KEK, Ibaraki
W.Y. Mok
Life Imaging Technology, Palo Alto, California

Funding: Work sponsored by U.S. Department of Energy Contract DE-AC03-76SF00515 and Office of Basic Energy Sciences, Division of Chemical Sciences.

A two-slit interferometer has been installed in the SPEAR3 diagnostic beam line to measure vertical beam size at a dipole source point. The diagnostic beam line accepts unfocused, visible light in a 3.5 x 6.0 mrad aperture so that at the slit location 17 m from the source, the vertical extent of the beam is 100mm. For typical source sizes of sigy~15 um (0.1% emittance coupling) a slit separation of 80 mm produces fringe visibility of order V=0.5. Hence a significant plot of fringe visibility vs. slit separation can be generated to infer source size via Fourier transformation. In this paper we report on the interferometer construction, beam size measurement and potential deficiencies of the system, and compare with theoretical results.