PAC2013 - List of Authors (Marone, A.)

Paper

Title

Page

Commissioning RHIC's Electron Lens

416

X. Gu, Z. Altinbas, M. Anerella, D. Bruno, M.R. Costanzo, W.C. Dawson, K.A. Drees, W. Fischer, B. Frak, D.M. Gassner, K. Hamdi, J. Hock, L.T. Hoff, A.K. Jain, J.P. Jamilkowski, R.F. Lambiase, Y. Luo, M. Mapes, A. Marone, C. Mi, R.J. Michnoff, T.A. Miller, M.G. Minty, C. Montag, S. Nemesure, W. Ng, D. Phillips, A.I. Pikin, S.R. Plate, P.J. Rosas, P. Sampson, J. Sandberg, L. Snydstrup, Y. Tan, R. Than, C. Theisen, P. Thieberger, J.E. Tuozzolo, P. Wanderer, W. Zhang
BNL, Upton, Long Island, New York, USA

Funding: Work supported by U.S. DOE under contract No DE-AC02-98CH10886 with the U.S. Department of Energy.
In the 2013 RHIC polarized proton run, it was found that the RHIC bunch intensity has reached a limit due to the head-on beam-beam interaction at 2x10¹¹, as expected by simulations. To overcome this limitation, two electron lenses will be used for compensation. We report on the commissioning of new lattices that reduce beam-beam driven resonance driving terms, and bunch-by-bunch proton diagnostic during 2013 run. The effect of electron beam transport solenoids on the proton orbit was tested. The instrumentation for Blue electron lens was tested and electron beam was propagated from the gun to the collector. A timing system was implemented for the electron beam. Control software, machine protection and synoptic display were developed and tested during commissioning. Both Blue and Yellow electron lens superconducting magnets are installed and their field straightness was measured and corrected in the tunnel using a magnetic needle. The Yellow vacuum system and backscattered electron detectors installation are also completed now.

Slides TUOCA2 [3.466 MB]

WEODA1

Design of the Superconducting Magnet System for the SuperKEKB Interaction Region

759

N. Ohuchi, N. Higashi, H. Koiso, A. Morita, Y. Ohnishi, K. Oide, H. Sugimoto, M. Tawada, K. Tsuchiya, H. Yamaoka, Z.G. Zong
KEK, Ibaraki, Japan
M. Anerella, J. Escallier, A.K. Jain, A. Marone, B. Parker, P. Wanderer
BNL, Upton, Long Island, New York, USA

SuperKEKB are now being constructed with a target luminosity of 8×10³⁵ which is 40 times higher than KEKB. This luminosity can be achieved by the "Nano-Beam" scheme, in which both beams should be squeezed to about 50 nm at the beam interaction point, IP. The superconducting magnet system has been designed in order to attain high luminosity. The system consists of 8 superconducting quadrupoles, 4 superconducting solenoids and 43 superconducting correctors. The magnets are installed into two cryostats in the interaction region, IR. For each beam, the final focusing system consists of quadrupole-doublets with 8 superconducting quadrupoles. To reduce the beam emittance at the IP, the superconducting solenoids cancel the integral solenoid field of the particle detector, Belle II, on the beam lines. The corrector system is very complicated and the multi-layered coils are mainly assembled inside of the quadrupole bores. In the paper, we would like to describe the most updated design of the superconducting magnet system for the SuperKEKB IR.

Slides WEODA1 [2.097 MB]

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
TUOCA2	Commissioning RHIC's Electron Lens	416
	X. Gu, Z. Altinbas, M. Anerella, D. Bruno, M.R. Costanzo, W.C. Dawson, K.A. Drees, W. Fischer, B. Frak, D.M. Gassner, K. Hamdi, J. Hock, L.T. Hoff, A.K. Jain, J.P. Jamilkowski, R.F. Lambiase, Y. Luo, M. Mapes, A. Marone, C. Mi, R.J. Michnoff, T.A. Miller, M.G. Minty, C. Montag, S. Nemesure, W. Ng, D. Phillips, A.I. Pikin, S.R. Plate, P.J. Rosas, P. Sampson, J. Sandberg, L. Snydstrup, Y. Tan, R. Than, C. Theisen, P. Thieberger, J.E. Tuozzolo, P. Wanderer, W. Zhang BNL, Upton, Long Island, New York, USA
	Funding: Work supported by U.S. DOE under contract No DE-AC02-98CH10886 with the U.S. Department of Energy. In the 2013 RHIC polarized proton run, it was found that the RHIC bunch intensity has reached a limit due to the head-on beam-beam interaction at 2x10¹¹, as expected by simulations. To overcome this limitation, two electron lenses will be used for compensation. We report on the commissioning of new lattices that reduce beam-beam driven resonance driving terms, and bunch-by-bunch proton diagnostic during 2013 run. The effect of electron beam transport solenoids on the proton orbit was tested. The instrumentation for Blue electron lens was tested and electron beam was propagated from the gun to the collector. A timing system was implemented for the electron beam. Control software, machine protection and synoptic display were developed and tested during commissioning. Both Blue and Yellow electron lens superconducting magnets are installed and their field straightness was measured and corrected in the tunnel using a magnetic needle. The Yellow vacuum system and backscattered electron detectors installation are also completed now.
	Slides TUOCA2 [3.466 MB]

WEODA1	Design of the Superconducting Magnet System for the SuperKEKB Interaction Region	759
	N. Ohuchi, N. Higashi, H. Koiso, A. Morita, Y. Ohnishi, K. Oide, H. Sugimoto, M. Tawada, K. Tsuchiya, H. Yamaoka, Z.G. Zong KEK, Ibaraki, Japan M. Anerella, J. Escallier, A.K. Jain, A. Marone, B. Parker, P. Wanderer BNL, Upton, Long Island, New York, USA
	SuperKEKB are now being constructed with a target luminosity of 8×10³⁵ which is 40 times higher than KEKB. This luminosity can be achieved by the "Nano-Beam" scheme, in which both beams should be squeezed to about 50 nm at the beam interaction point, IP. The superconducting magnet system has been designed in order to attain high luminosity. The system consists of 8 superconducting quadrupoles, 4 superconducting solenoids and 43 superconducting correctors. The magnets are installed into two cryostats in the interaction region, IR. For each beam, the final focusing system consists of quadrupole-doublets with 8 superconducting quadrupoles. To reduce the beam emittance at the IP, the superconducting solenoids cancel the integral solenoid field of the particle detector, Belle II, on the beam lines. The corrector system is very complicated and the multi-layered coils are mainly assembled inside of the quadrupole bores. In the paper, we would like to describe the most updated design of the superconducting magnet system for the SuperKEKB IR.
	Slides WEODA1 [2.097 MB]

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.