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Featured researches published by J. Laster.


ieee particle accelerator conference | 2007

Accelerating polarized protons to 250 GeV

M. Bai; L. Ahrens; I.G. Alekseev; J. Alessi; J. Beebe-Wang; M. Blaskiewicz; A. Bravar; J.M. Brennan; K.A. Brown; D. Bruno; G. Bunce; J. Butler; P. Cameron; R. Connolly; J. DeLong; T. D'Ottavio; A. Drees; M.W. Fischer; G. Ganetis; C. Gardner; J. W. Glenn; T. Hayes; H.C. Hseuh; H. Huang; P. Ingrassia; J. Laster; R. Lee; A. Luccio; Y. Luo; W. W. MacKay

The relativistic heavy ion collider (RHIC) as the first high energy polarized proton collider was designed to provide polarized proton collisions at a maximum beam energy of 250 GeV. It has been providing collisions at a beam energy of 100 GeV since 2001. Equipped with two full Siberian snakes in each ring, polarization is preserved during the acceleration from injection to 100 GeV with careful control of the betatron tunes and the vertical orbit distortions. However, the intrinsic spin resonances beyond 100 GeV are about a factor of two stronger than those below 100 GeV making it important to examine the impact of these strong intrinsic spin resonances on polarization survival and the tolerance for vertical orbit distortions. Polarized protons were accelerated to the record energy of 250 GeV in RHIC with a polarization of 46% measured at top energy in 2006. The polarization measurement as a function of beam energy also shows some polarization loss around 136 GeV, the first strong intrinsic resonance above 100 GeV. This paper presents the results and discusses the sensitivity of the polarization survival to orbit distortions.


7th Int. Particle Accelerator Conf. (IPAC'16), Busan, Korea, May 8-13, 2016 | 2016

RHIC Performance with Stochastic Cooling for Ions and Head-on Beam-beam Compensation for Protons

W. Fischer; James Alessi; Zeynep Altinbas; Elke Aschenauer; Grigor Atoian; M. Bai; Edward Beebe; Severino Binello; Ian Blackler; Michael Blaskiewicz; Joseph Brennan; Kevin Brown; D. Bruno; R. Connolly; Michael Costanzo; T. D'Ottavio; Yann Dutheil; Alexei Fedotov; C. Gardner; David Gassner; X. Gu; Caitlin Harper; M. Harvey; T. Hayes; Jon Hock; Haixin Huang; R. Hulsart; James Jamilkowski; Takeshi Kanesue; Nicholas Kling

The Relativistic Heavy Ion Collider (RHIC) has two main operating modes with heavy ions and polarized protons respectively. In addition to a continuous increase in the bunch intensity in all modes, two major new systems were completed recently mitigating the main luminosity limit and leading to significant performance improvements. For heavy ion operation stochastic cooling mitigates the effects of intrabeam scattering, and for polarized proton operation head-on beam-beam compensation mitigates the beam-beam effect. We present the performance increases with these upgrades to date, as well as an overview of all operating modes past and planned.


Proceedings of the 17th International Spin Physics Symposium | 2007

Accelerating Polarized Protons to High Energy

M. Bai; L. Ahrens; I.G. Alekseev; J. Alessi; J. Beebe-Wang; M. Blaskiewicz; A. Bravar; J.M. Brennan; D. Bruno; G. Bunce; J. Butler; P. Cameron; R. Connolly; J. DeLong; T. D Ottavio; A. Drees; W. Fischer; G. Ganetis; C. Gardner; J. W. Glenn; T. Hayes; H.C. Hseuh; H. Huang; P. Ingrassia; J. Laster; R. Lee; A. Luccio; Y. Luo; W. W. MacKay; Y. Makdisi

The Relativistic Heavy Ion Collider (RHIC) is designed to provide collisions of high energy polarized protons for the quest of understanding the proton spin structure. Polarized proton collisions at a beam energy of 100 GeV have been achieved in RHIC since 2001. Recently, polarized proton beam was accelerated to 250 GeV in RHIC for the first time. Unlike accelerating unpolarized protons, the challenge for achieving high energy polarized protons is to fight the various mechanisms in an accelerator that can lead to partial or total polarization loss due to the interaction of the spin vector with the magnetic fields. We report on the progress of the RHIC polarized proton program. We also present the strategies of how to preserve the polarization through the entire acceleration chain, i.e. a 200 MeV linear accelerator, the Booster, the AGS and RHIC.


3rd International Particle Accelerator Conference 2012, IPAC 2012 | 2012

RHIC POLARIZED PROTON OPERATION IN RUN 12

V. Schoefer; L. Ahrens; A.Anders; Elke Aschenauer; G.Atoian; M. Bai; J. Beebe-Wang; M. Blaskiewicz; J.M. Brennan; K.A. Brown; D. Bruno; R. Connolly; T. D'Ottavio; A. Dion; W. Fischer; C. Gardner; J. W. Glenn; X. Gu; M. Harvey; T. Hayes; L. Hoff; H. Huang; R. Hulsart; A.Kirleis; J. Laster; C. Liu; Y. Luo; Y. Makdisi; G. Marr; A. Marusic


Archive | 2013

RHIC Polarized Proton Operation for 2013

Vahid Ranjbar; Oleg Eyser; K. Yip; Michael Blaskiewicz; William Schmidke; F. Meot; Vadim Ptitsyn; A. Zaltsman; Kevin Brown; T. D'Ottavio; A. Zelenski; A. Poblaguev; C. Gardner; D. Bruno; Joseph Brennan; Elke Aschenauer; Anders Kirleis; X. Gu; T. Shrey; R. Hulsart; R. Connolly; K. Zeno; T. Hayes; K. Smith; Joseph Glenn; Michelle Wilinski; G. Marr; S. Tepikian; Dejan Trbojevic; C. Montag


2011 Particle Accelerator Conference (PAC'11); New York, NY; 20110328 through 20110401 | 2011

RHIC Polarized proton operation

H. Huang; L. Ahrens; I.G. Alekseev; Elke Aschenauer; G. Atoian; M. Bai; A. Bazilevsky; M. Blaskiewicz; J.M. Brennan; K.A. Brown; D. Bruno; R. Connolly; A. Dion; T. D'Ottavio; W. Fischer; C. Gardner; J. W. Glenn; X. Gu; M. Harvey; T. Hayes; L. Hoff; R. Hulsart; J. Laster; C. Liu; Y. Luo; W. W. MacKay; Y. Makdisi; G. Marr; A. Marusic; F. Meot


4th International Particle Accelerator Conference, IPAC 2013 | 2013

RHIC performance for fy2012 heavy ion run

Y. Luo; J. Alessi; M. Bai; J. Beebe-Wang; I. Blackler; M. Blaskiewicz; J.M. Brennan; K.A. Brown; D. Bruno; J. Butler; R. Connolly; T. D Ottavio; A. Fedotov; W. Fischer; C. Gardner; D. Gassner; X. Gu; Y. Hao; M. Harvey; T. Hayes; L. Hoff; H. Huang; P. Ingrassia; J. Jamilkowski; N. Kling; M. Lafky; J. Laster; C. Liu; D. Maffei; Y. Makdisi


2nd International Particle Accelerator Conference, IPAC 2011 | 2011

RHIC POLARIZED PROTON OPERATION AND HIGHLIGHTS

H. Huang; L. Ahrens; I.G. Alekseev; Elke Aschenauer; G.Atoian; M. Bai; A. Bazilevsky; M. Blaskiewicz; J.M. Brennan; K.A. Brown; D. Bruno; R. Connolly; A. Dion; T. D'Ottavio; W. Fischer; C. Gardner; J. W. Glenn; X. Gu; M. Harvey; T. Hayes; L. Hoff; R. Hulsart; J. Laster; C. Liu; Y. Luo; W. W. MacKay; Y. Makdisi; G. Marr; A. Marusic; F. Meot


2011 Particle Accelerator Conference (PAC'11); New York, NY; 20110328 through 20110401 | 2011

Medium energy heavy ion operations at RHIC

L. Ahrens; M. Bai; J. Beebe-Wang; I. Blackler; M. Blaskiewicz; K.A. Brown; M. Brennan; D. Bruno; J. Butler; C. Carlson; R. Connolly; T. D'Ottavio; W. Fischer; W. Fu; D. Gassner; M. Harvey; T. Hayes; H. Huang; R. Hulsart; P. Ingrassia; N. Kling; M. Lafky; J. Laster; R. Lee; Vladimir N. Litvinenko; Y. Luo; W. W. MacKay; G. Marr; Mapes. M.; A. Marusic


Archive | 2013

STATUS AND PLANS FOR THE POLARIZED HADRON COLLIDER AT RHIC

M. Bai; L. Ahrens; Elke Aschenauer; G. Atoian; J. Beebe-Wang; M. Blaskiewicz; J.M. Brennan; K.A. Brown; D. Bruno; R. Connolly; K.O. Eyser; T. D Ottavio; Yann Dutheil; W. Fischer; C. Gardner; J. W. Glenn; X. Gu; M. Harvey; T. Hayes; H. Huang; R. Hulsart; A.Kirleis; J. Laster; C. Liu; Y. Luo; Y. Makdisi; G. Marr; A. Marusic; F. Meot; K. Mernick

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D. Bruno

Brookhaven National Laboratory

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R. Connolly

Brookhaven National Laboratory

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T. Hayes

Brookhaven National Laboratory

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C. Gardner

Brookhaven National Laboratory

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W. Fischer

Brookhaven National Laboratory

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H. Huang

Brookhaven National Laboratory

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M. Blaskiewicz

Brookhaven National Laboratory

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J.M. Brennan

Brookhaven National Laboratory

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K.A. Brown

Brookhaven National Laboratory

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M. Bai

Brookhaven National Laboratory

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