PAC2013 - List of Authors (Swinnen, L.)

Paper	Title	Page
THPBA03	Design, Fabrication, Measurement, Installation and Alignment of 2 Types of Quadrupole-sextupole Combined Magnets for the Upgrade of the 1.2 GeV Booster Synchrotron at Tohoku University	1229
	W. Beeckman, S. Antoine, P. Bocher, F. Forest, P. Jehanno, P. Jivkov, M.J. Leray, S. Taillardat Sigmaphi, Vannes, France H. Hama, F. Hinode Tohoku University, Research Center for Electron Photon Science, Sendai, Japan L. Swinnen Sigmaphi Japan, Tokyo, Japan
	The upgrade of the 1.2 GeV booster synchrotron is part of the recovery program from the March 11 2011, Great East Japan Earthquake. The replacement of standard quadrupoles by combined quadrupole-sextupole magnets will tame the head-tail instability by changing the chromaticity from the natural, negative, values to positive values, which will prevent the highly unstable m=0 mode to develop. In January 2012, Sigmaphi was awarded a contract for the design of 2 kinds of combined magnets and the fabrication of 8 magnets of each type, including rotating coil and Hall probe measurements of every unit. The contract also required disassembly of the old quadrupoles and installation of the new combined magnets, including disassembly/reassembly of the vacuum chambers and fitting with new UHV gaskets. Finally, all the booster magnets, namely 8 dipoles, 4 achromat quadrupoles and the 16 new combined function magnets were to be realigned within ±0.2 mm accuracy by mid- January 2013. The presentation outlines the main steps of the different operations and presents the achievements and results.

Paper

Title

Page

Design, Fabrication, Measurement, Installation and Alignment of 2 Types of Quadrupole-sextupole Combined Magnets for the Upgrade of the 1.2 GeV Booster Synchrotron at Tohoku University

1229

W. Beeckman, S. Antoine, P. Bocher, F. Forest, P. Jehanno, P. Jivkov, M.J. Leray, S. Taillardat
Sigmaphi, Vannes, France
H. Hama, F. Hinode
Tohoku University, Research Center for Electron Photon Science, Sendai, Japan
L. Swinnen
Sigmaphi Japan, Tokyo, Japan

The upgrade of the 1.2 GeV booster synchrotron is part of the recovery program from the March 11 2011, Great East Japan Earthquake. The replacement of standard quadrupoles by combined quadrupole-sextupole magnets will tame the head-tail instability by changing the chromaticity from the natural, negative, values to positive values, which will prevent the highly unstable m=0 mode to develop. In January 2012, Sigmaphi was awarded a contract for the design of 2 kinds of combined magnets and the fabrication of 8 magnets of each type, including rotating coil and Hall probe measurements of every unit. The contract also required disassembly of the old quadrupoles and installation of the new combined magnets, including disassembly/reassembly of the vacuum chambers and fitting with new UHV gaskets. Finally, all the booster magnets, namely 8 dipoles, 4 achromat quadrupoles and the 16 new combined function magnets were to be realigned within ±0.2 mm accuracy by mid- January 2013. The presentation outlines the main steps of the different operations and presents the achievements and results.