IBIC2017 - List of Authors (Corbett, W.J.)

Paper	Title	Page
TUPCC09	Electron Bunch Pattern Monitoring via Single Photon Counting at SPEAR3	168
	B. Xu, E. Carranza, A. Chen, S. Condamoor, W.J. Corbett, A.S. Fisher SLAC, Menlo Park, California, USA
	In recent years the synchrotron radiation program at SPEAR3 has moved increasingly toward laser/x-ray pump-probe experiments which utilize a single timing ‘probe' bunch isolated by 50ns dark space ahead and behind the bunch. In order to quantify bunch purity in the region near the timing bunch, time-correlated single-photon counting is used. In this paper we investigate methods to optimize data acquisition speed and improve measurement resolution in the region near the timing bunch through data analysis and fast signal gating. Integration of the measured data into the EPICS database is reported.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-TUPCC09
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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
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Electron Bunch Pattern Monitoring via Single Photon Counting at SPEAR3

168

B. Xu, E. Carranza, A. Chen, S. Condamoor, W.J. Corbett, A.S. Fisher
SLAC, Menlo Park, California, USA

In recent years the synchrotron radiation program at SPEAR3 has moved increasingly toward laser/x-ray pump-probe experiments which utilize a single timing ‘probe' bunch isolated by 50ns dark space ahead and behind the bunch. In order to quantify bunch purity in the region near the timing bunch, time-correlated single-photon counting is used. In this paper we investigate methods to optimize data acquisition speed and improve measurement resolution in the region near the timing bunch through data analysis and fast signal gating. Integration of the measured data into the EPICS database is reported.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-TUPCC09

Export •

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

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

Export •

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