FEL2009 - List of Authors (Santucci, J.K.)

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Santucci, J.K.

Paper	Title	Page
TUPC46	Spatial Resolution Limits of YAG:Ce Powder Beam-Profile Monitors at the Fermilab A0 Photoinjector	348
	A.H. Lumpkin, A.S. Johnson, J. Ruan, J.K. Santucci, Y.-E. Sun, R. Thurman-Keup Fermilab, Batavia P. Piot Northern Illinois University, DeKalb, Illinois
	The A0 photoinjector (A0PI) facility at Fermilab has an ongoing proof-of-principle experiment to demonstrate the exchange of the transverse horizontal and longitudinal emittances[1]. This experiment relies on measurements of the transverse emittances and longitudinal emittance upstream and downstream of an emittance-exchanger beamline. At several locations along the accelerator beamline, YAG:Ce powder scintillator screens are used to determine beam size, divergence, and energy spread when used in an electron beam spectrometer. The screens have ~5-micron grain size and are deposited on a metal substrate as provided by DESY[2]. We have recently performed direct comparisons of beam image and slit image sizes using both the OTR screens and the YAG:Ce screens. For micropulse charges of 250 pC and with beam energies of 15 MeV, we systematically observed larger beam image sizes with the YAG:Ce screens than with the OTR screens. We deduced a YAG:Ce screen spatial resolution limit of σ=140 to 180 microns. Results at both the beam profile stations at different drift lengths from the slits and in the electron spectrometer will be reported as well as the needed corrections to the emittances. [1] T.W. Koeth et al., Proceedings of PAC09, Vancouver, Canada. [2] The YAG:Ce samples were manufactured at DESY and the associated specifications were provided by Klaus Floettmann, DESY.

Paper

Title

Page

TUPC46

Spatial Resolution Limits of YAG:Ce Powder Beam-Profile Monitors at the Fermilab A0 Photoinjector

348

A.H. Lumpkin, A.S. Johnson, J. Ruan, J.K. Santucci, Y.-E. Sun, R. Thurman-Keup
Fermilab, Batavia
P. Piot
Northern Illinois University, DeKalb, Illinois

The A0 photoinjector (A0PI) facility at Fermilab has an ongoing proof-of-principle experiment to demonstrate the exchange of the transverse horizontal and longitudinal emittances[1]. This experiment relies on measurements of the transverse emittances and longitudinal emittance upstream and downstream of an emittance-exchanger beamline. At several locations along the accelerator beamline, YAG:Ce powder scintillator screens are used to determine beam size, divergence, and energy spread when used in an electron beam spectrometer. The screens have ~5-micron grain size and are deposited on a metal substrate as provided by DESY[2]. We have recently performed direct comparisons of beam image and slit image sizes using both the OTR screens and the YAG:Ce screens. For micropulse charges of 250 pC and with beam energies of 15 MeV, we systematically observed larger beam image sizes with the YAG:Ce screens than with the OTR screens. We deduced a YAG:Ce screen spatial resolution limit of σ=140 to 180 microns. Results at both the beam profile stations at different drift lengths from the slits and in the electron spectrometer will be reported as well as the needed corrections to the emittances.

[1] T.W. Koeth et al., Proceedings of PAC09, Vancouver, Canada.
[2] The YAG:Ce samples were manufactured at DESY and the associated specifications were provided by Klaus Floettmann, DESY.