PAC2013 - List of Authors (Parker, B.)

Paper

Title

Page

NS-FFAG for Electron-Ion Collider in RHIC (eRHIC)

553

D. Trbojevic, J.S. Berg, S.J. Brooks, O.V. Chubar, Y. Hao, V. Litvinenko, C. Liu, W. Meng, F. Méot, B. Parker, V. Ptitsyn, T. Roser, N. Tsoupas, W.-T. Weng
BNL, Upton, Long Island, New York, USA

Funding: Work performed under Contract Number DE-AC02-98CH10886 with the auspices of the US Department of Energy.
A future electron ion collider "QCD test facility" is designed in the present Relativistic Heavy Ion Collider (RHIC) tunnel. Electron acceleration and de-acceleration is preformed with energy recovery linac with multiple passes. We report on a combination of a multi-pass linac with the Non-Scaling Fixed Field Alternating Gradient (NS-FFAG) arcs. A single NS-FFAG arc allow electrons to pass through the same structure with an energy range between 1.425 and 10 GeV. The NS-FFAG is placed in the existing RHIC tunnel. The 200 MeV injector bring the polarized electrons to the 1.225 GeV GeV superconducting linac. After one pass through the linac 1.425 GeV electrons enter NS-FFAG arc and after 7 passes reach the energy of 10 GeV. After collisions the beam is brought back by the NS-FFAG and decelerated to the initial energy and directed to the dump.

TUPBA15

eRHIC Interaction Region and Lattice Design*

559

D. Trbojevic, E.C. Aschenauer, Y.C. Jing, V. Litvinenko, Y. Luo, B. Parker, V. Ptitsyn
BNL, Upton, Long Island, New York, USA

Funding: Work performed under Contract Number DE-AC02-98CH10886 with the auspices of the US Department of Energy.∗
A proposal for the new high luminosity L=10³⁴ s^-1 cm^-2, polarized electron proton/3He and other un-polarized heavy ions eRHIC based on Electron Recovery Linacs (ERL), assumes a location in the existing tunnel of the operating Relativistic Heavy Ion Collider (RHIC). Requests of the experiments for the interaction region are very challenging: allow detection of neutrons, allow deep virtual scattering for protons-electron collisions, detection of partons with lower momentum, etc. We present an interaction region (IR) design with a vey high focusing where at the collision point IP of 5 cm, and a 10 mrad collision angle between electrons and ions using the crab cavities. We are introducing a combined function magnet for the first element in the high focusing triplet configuration to provide neutron and the lower energy parton detection, and allow at 4.5 cm distance passage of electrons through a no magnetic field region. The 200 T/m gradient quadrupoles provide very small beam size at the IP and allows a passage with a very small magnetic field for electrons.

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]

THOAB2

Large Momentum Acceptance Superconducting NS-FFAG Gantry for Carbon Cancer Therapy

1119

D. Trbojevic, B. Parker
BNL, Upton, Long Island, New York, USA
M. Pullia
CNAO Foundation, Milan, Italy

Funding: Work performed under Contract Number DE-AC02-98CH10886 with the auspices of the US Department of Energy.∗
Carbon cancer radiation therapy has clear advantages with respect to the other radiation therapy treatments. Cost of the ion cancer therapy is dominated by the delivery systems. An new design of the superconducting Non-Scaling FFAG (NS-FFAG) carbon isocentric gantry is presented. The magnet size and weight is dramatically smaller with respect to other gantries in cancer therapy treatment. The weight of the transport elements of the carbon isocentric gantry is estimated to be 1.5 tons to be compared to the 130 tons weight of the top-notch Heidelberg facility gantry.

Slides THOAB2 [41.118 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
TUPBA13	NS-FFAG for Electron-Ion Collider in RHIC (eRHIC)	553
	D. Trbojevic, J.S. Berg, S.J. Brooks, O.V. Chubar, Y. Hao, V. Litvinenko, C. Liu, W. Meng, F. Méot, B. Parker, V. Ptitsyn, T. Roser, N. Tsoupas, W.-T. Weng BNL, Upton, Long Island, New York, USA
	Funding: Work performed under Contract Number DE-AC02-98CH10886 with the auspices of the US Department of Energy. A future electron ion collider "QCD test facility" is designed in the present Relativistic Heavy Ion Collider (RHIC) tunnel. Electron acceleration and de-acceleration is preformed with energy recovery linac with multiple passes. We report on a combination of a multi-pass linac with the Non-Scaling Fixed Field Alternating Gradient (NS-FFAG) arcs. A single NS-FFAG arc allow electrons to pass through the same structure with an energy range between 1.425 and 10 GeV. The NS-FFAG is placed in the existing RHIC tunnel. The 200 MeV injector bring the polarized electrons to the 1.225 GeV GeV superconducting linac. After one pass through the linac 1.425 GeV electrons enter NS-FFAG arc and after 7 passes reach the energy of 10 GeV. After collisions the beam is brought back by the NS-FFAG and decelerated to the initial energy and directed to the dump.

TUPBA15	eRHIC Interaction Region and Lattice Design*	559
	D. Trbojevic, E.C. Aschenauer, Y.C. Jing, V. Litvinenko, Y. Luo, B. Parker, V. Ptitsyn BNL, Upton, Long Island, New York, USA
	Funding: Work performed under Contract Number DE-AC02-98CH10886 with the auspices of the US Department of Energy.∗ A proposal for the new high luminosity L=10³⁴ s^-1 cm^-2, polarized electron proton/3He and other un-polarized heavy ions eRHIC based on Electron Recovery Linacs (ERL), assumes a location in the existing tunnel of the operating Relativistic Heavy Ion Collider (RHIC). Requests of the experiments for the interaction region are very challenging: allow detection of neutrons, allow deep virtual scattering for protons-electron collisions, detection of partons with lower momentum, etc. We present an interaction region (IR) design with a vey high focusing where at the collision point IP of 5 cm, and a 10 mrad collision angle between electrons and ions using the crab cavities. We are introducing a combined function magnet for the first element in the high focusing triplet configuration to provide neutron and the lower energy parton detection, and allow at 4.5 cm distance passage of electrons through a no magnetic field region. The 200 T/m gradient quadrupoles provide very small beam size at the IP and allows a passage with a very small magnetic field for electrons.

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]

THOAB2	Large Momentum Acceptance Superconducting NS-FFAG Gantry for Carbon Cancer Therapy	1119
	D. Trbojevic, B. Parker BNL, Upton, Long Island, New York, USA M. Pullia CNAO Foundation, Milan, Italy
	Funding: Work performed under Contract Number DE-AC02-98CH10886 with the auspices of the US Department of Energy.∗ Carbon cancer radiation therapy has clear advantages with respect to the other radiation therapy treatments. Cost of the ion cancer therapy is dominated by the delivery systems. An new design of the superconducting Non-Scaling FFAG (NS-FFAG) carbon isocentric gantry is presented. The magnet size and weight is dramatically smaller with respect to other gantries in cancer therapy treatment. The weight of the transport elements of the carbon isocentric gantry is estimated to be 1.5 tons to be compared to the 130 tons weight of the top-notch Heidelberg facility gantry.
	Slides THOAB2 [41.118 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.