PAC2013 - List of Authors (Hocker, H.M.)

Paper	Title	Page
THPBA07	Superconducting Corrector IR Magnet Production for SuperKEKB	1241
	B. Parker, M. Anerella, J. Escallier, A.K. Ghosh, H.M. Hocker, A.K. Jain, A. Marone, P. Wanderer BNL, Upton, Long Island, New York, USA Y. Arimoto, M. Iwasaki, N. Ohuchi, M. Tawada, K. Tsuchiya, H. Yamaoka, Z.G. Zong KEK, Ibaraki, Japan
	The SuperKEKB luminosity upgrade IR needs 43 different superconducting correction coils. There are dipole (b1), skew-dipole and skew-quad correctors, (a1, a2), for orbit and optics control and b3 and b4 correctors for acceptable circulating beam lifetime. Most coils are sandwiched inside the main IR quad apertures but a few are located on independent support tubes outside the quad collars or on interconnects between quads. Four complex external field cancel coils, b3-b6, are needed to buck non-linear fields outside the quads closest to the interaction point. In the IR crossing angle geometry the first quads have no magnetic yokes and the cancel coils’ end turn spacings must match the field falloff with increasing beam separation. SuperKEKB IR correctors have tight harmonic tolerances with allowed field deviation at the reference radius of a few gauss at each position along the coil. Also the cancel coils have a position dependent “twist” to generate the correct local amount of skew field for the SuperKEKB optics.

Paper

Title

Page

Superconducting Corrector IR Magnet Production for SuperKEKB

1241

B. Parker, M. Anerella, J. Escallier, A.K. Ghosh, H.M. Hocker, A.K. Jain, A. Marone, P. Wanderer
BNL, Upton, Long Island, New York, USA
Y. Arimoto, M. Iwasaki, N. Ohuchi, M. Tawada, K. Tsuchiya, H. Yamaoka, Z.G. Zong
KEK, Ibaraki, Japan

The SuperKEKB luminosity upgrade IR needs 43 different superconducting correction coils. There are dipole (b1), skew-dipole and skew-quad correctors, (a1, a2), for orbit and optics control and b3 and b4 correctors for acceptable circulating beam lifetime. Most coils are sandwiched inside the main IR quad apertures but a few are located on independent support tubes outside the quad collars or on interconnects between quads. Four complex external field cancel coils, b3-b6, are needed to buck non-linear fields outside the quads closest to the interaction point. In the IR crossing angle geometry the first quads have no magnetic yokes and the cancel coils’ end turn spacings must match the field falloff with increasing beam separation. SuperKEKB IR correctors have tight harmonic tolerances with allowed field deviation at the reference radius of a few gauss at each position along the coil. Also the cancel coils have a position dependent “twist” to generate the correct local amount of skew field for the SuperKEKB optics.