IBIC2017 - List of Authors (Boland, M.J.)

Paper	Title	Page
WEPCC09	Horizontal Opening of the Synchrotron Radiation and Effect of Incoherent Depth of Field for Horizontal Beam Size Measurement	364
	T.M. Mitsuhashi KEK, Ibaraki, Japan M.J. Boland ASCo, Clayton, Victoria, Australia W.J. Corbett SLAC, Menlo Park, California, USA
	The incoherent depth-of-field due to the instantaneous opening angle of dipole SR emission can influence horizontal beam size measurements. In particular, for double-slit spatial interferometry, the opening angle introduces an intensity imbalance across the two slits that reduces interference contrast and therefore increases the apparent beam size. To investigate this effect, the instantaneous horizontal opening of the SR light must be known. Schwinger's theory gives the vertical opening angle and the qualitative theory of K.J. Kim gives an estimate for horizontal opening angle. An extension of Schwinger's theory to the horizontal plane by one of the authors leads to the same Bessel function distribution as the vertical plane using integration by parts. Neglecting the cubic phase term in the exponent, the expression agrees with Kim's diffraction theory. Using this result to correct for incoherent depth-of-field effects in double-slit measurements at the Australian Synchrotron, ATF and SPEAR3, the measured horizontal beam size is in good agreement with design values.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-WEPCC09
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Paper

Title

Page

Horizontal Opening of the Synchrotron Radiation and Effect of Incoherent Depth of Field for Horizontal Beam Size Measurement

364

T.M. Mitsuhashi
KEK, Ibaraki, Japan
M.J. Boland
ASCo, Clayton, Victoria, Australia
W.J. Corbett
SLAC, Menlo Park, California, USA

The incoherent depth-of-field due to the instantaneous opening angle of dipole SR emission can influence horizontal beam size measurements. In particular, for double-slit spatial interferometry, the opening angle introduces an intensity imbalance across the two slits that reduces interference contrast and therefore increases the apparent beam size. To investigate this effect, the instantaneous horizontal opening of the SR light must be known. Schwinger's theory gives the vertical opening angle and the qualitative theory of K.J. Kim gives an estimate for horizontal opening angle. An extension of Schwinger's theory to the horizontal plane by one of the authors leads to the same Bessel function distribution as the vertical plane using integration by parts. Neglecting the cubic phase term in the exponent, the expression agrees with Kim's diffraction theory. Using this result to correct for incoherent depth-of-field effects in double-slit measurements at the Australian Synchrotron, ATF and SPEAR3, the measured horizontal beam size is in good agreement with design values.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-WEPCC09

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)