PAC2013 - List of Authors (Church, M.D.)

Paper	Title	Page
TUPAC21	Performance Comparisons of Emittance-exchanger Beamlines	496
	C.R. Prokop, P. Piot Northern Illinois University, DeKalb, Illinois, USA B.E. Carlsten LANL, Los Alamos, New Mexico, USA M.D. Church, P. Piot Fermilab, Batavia, USA
	Funding: Work supported by LDRD project #20110067DR and by the U.S. DoE Contract No. DE-FG02-08ER41532 with NIU and No. DE-AC02-07CH11359 with Fermilab. Earlier experiments at Fermilab’s A0 Photoinjector Laboratory demonstrated successful transverse-to-longitudinal emittance exchange (EEX) using a transverse-deflecting cavity (TDC) located between two identical doglegs. Such a design has the disadvantage of transversely displacing the beam. An alternative is an EEX beamline designed out of a variable R₅₆ bunch compressor chicane. In this paper, we present designs and simulation comparisons for several emittance-exchanger beamlines, including the double-dogleg and chicane designs, as well as variations of the chicane design that allow for increasing its dispersion which proportionally decreases the field-strength requirements on the TDC. These comparisons are performed with PIC models of space charge and coherent synchrotron radiation.

TUPSM12	High Power Test of a 3.9 GHz 5-Cell Deflecting-Mode Cavity in a Cryogenic Operation	658
	Y.-M. Shin, M.D. Church Fermilab, Batavia, USA
	A 3.9 GHz deflecting mode (pi, TM110) cavity has been long used for six-dimensional phase-space beam manipulation tests * * ** *** at the A0 Photo-Injector Lab (16 MeV) in Fermilab and their extended applications with vacuum cryomodules are currently planned at the Advanced Superconducting Test Accelerator (ASTA) user facility (> 50 MeV). Despite the successful test results, the cavity, however, demonstrated limited RF performance during liquid nitrogen (LN2) ambient operation that was inferior to theoretical prediction. We have been performing full analysis of the designed cavity by analytic calculation and comprehensive system simulation analysis to solve complex thermodynamics and mechanical stresses. The re-assembled cryomodule is currently under the test with a 50 kW klystron at the Fermilab A0 beamline, which will benchmark the modeling analysis. The test result will be used to design vacuum cryomodules for the 3.9 GHz deflecting mode cavity that will be employed at the ASTA facility for beam diagnostics and phase-space control. * D. A. Edwards, LINAC 2002 Y.-E Sun, PRTAB 2004 * P. Piot, PRSTAB2006 ** J. Ruand et al., PRL 2011 *** Y.-E. Sun, et al., PRL 2010

Paper

Title

Page

Performance Comparisons of Emittance-exchanger Beamlines

496

C.R. Prokop, P. Piot
Northern Illinois University, DeKalb, Illinois, USA
B.E. Carlsten
LANL, Los Alamos, New Mexico, USA
M.D. Church, P. Piot
Fermilab, Batavia, USA

Funding: Work supported by LDRD project #20110067DR and by the U.S. DoE Contract No. DE-FG02-08ER41532 with NIU and No. DE-AC02-07CH11359 with Fermilab.
Earlier experiments at Fermilab’s A0 Photoinjector Laboratory demonstrated successful transverse-to-longitudinal emittance exchange (EEX) using a transverse-deflecting cavity (TDC) located between two identical doglegs. Such a design has the disadvantage of transversely displacing the beam. An alternative is an EEX beamline designed out of a variable R₅₆ bunch compressor chicane. In this paper, we present designs and simulation comparisons for several emittance-exchanger beamlines, including the double-dogleg and chicane designs, as well as variations of the chicane design that allow for increasing its dispersion which proportionally decreases the field-strength requirements on the TDC. These comparisons are performed with PIC models of space charge and coherent synchrotron radiation.

TUPSM12

High Power Test of a 3.9 GHz 5-Cell Deflecting-Mode Cavity in a Cryogenic Operation

658

Y.-M. Shin, M.D. Church
Fermilab, Batavia, USA

A 3.9 GHz deflecting mode (pi, TM110) cavity has been long used for six-dimensional phase-space beam manipulation tests * ** *** **** ***** at the A0 Photo-Injector Lab (16 MeV) in Fermilab and their extended applications with vacuum cryomodules are currently planned at the Advanced Superconducting Test Accelerator (ASTA) user facility (> 50 MeV). Despite the successful test results, the cavity, however, demonstrated limited RF performance during liquid nitrogen (LN2) ambient operation that was inferior to theoretical prediction. We have been performing full analysis of the designed cavity by analytic calculation and comprehensive system simulation analysis to solve complex thermodynamics and mechanical stresses. The re-assembled cryomodule is currently under the test with a 50 kW klystron at the Fermilab A0 beamline, which will benchmark the modeling analysis. The test result will be used to design vacuum cryomodules for the 3.9 GHz deflecting mode cavity that will be employed at the ASTA facility for beam diagnostics and phase-space control.
* D. A. Edwards, LINAC 2002
** Y.-E Sun, PRTAB 2004
*** P. Piot, PRSTAB2006
**** J. Ruand et al., PRL 2011
***** Y.-E. Sun, et al., PRL 2010