PAC2013 - List of Authors (Ptitsyn, V.)

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.

TUPBA26	Coupling Spin Resonances With Siberian Snakes	577
	N.Z. Khalil SBU, Stony Brook, New York, USA V. Ptitsyn BNL, Upton, Long Island, New York, USA
	The polarization of proton beam during the acceleration process in a particle accelerator is affected by the existence of spin resonances. Coupling spin resonances can be excited in the presence of the betatron coupling introduced by rolled quadrupoles and solenoids. A corresponding algorithm has been developed and added to the ASPIRRIN code to include the calculation of the first-order intrinsic resonance harmonics in the case of arbitrary strong betatron coupling and in the presence of Siberian Snakes and spin rotators. The analysis of the coupling resonance harmonics excited in RHIC collider is presented.

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.

TUPBA26

Coupling Spin Resonances With Siberian Snakes

577

N.Z. Khalil
SBU, Stony Brook, New York, USA
V. Ptitsyn
BNL, Upton, Long Island, New York, USA

The polarization of proton beam during the acceleration process in a particle accelerator is affected by the existence of spin resonances. Coupling spin resonances can be excited in the presence of the betatron coupling introduced by rolled quadrupoles and solenoids. A corresponding algorithm has been developed and added to the ASPIRRIN code to include the calculation of the first-order intrinsic resonance harmonics in the case of arbitrary strong betatron coupling and in the presence of Siberian Snakes and spin rotators. The analysis of the coupling resonance harmonics excited in RHIC collider is presented.