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H. Huang,
L. Ahrens,
M. Bai,
K. A. Brown, W. Glenn,
A. U. Luccio,
W. W. MacKay,
C. Montag,
V. Ptitsyn,
T. Roser,
N. Tsoupas,
K. Zeno,
V. Ranjbar,
R. V. Cadman,
H. Spinka,
D. Underwood,
High Energy Physics,
BNL,
Indiana Univ
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ABSTRACT: An 11.4% partial Siberian snake was used to successfully accelerate polarized protons through a strong intrinsic depolarizing spin resonance in the Alternating Gradient Synchrotron (AGS). No noticeable depolarization was observed. This opens up the possibility of using a 20% to 30% partial Siberian snake in the AGS or other medium energy proton synchrotrons to overcome all weak and strong depolarizing spin resonances.
Phys. Rev. ST Accel. Beams. 05/2004; 1(Jun. 2004).
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V. H. Ranjbar,
S.Y. Lee,
L. Ahrens,
M. Bai,
K. Brown, W. Glenn,
H. Huang,
A. Luccio,
W. W. MacKay,
V. Ptitsyn,
T. Roser,
N. Tsoupas
Physical Review Special Topics - Accelerators and Beams 05/2004; 7:051001. · 1.52 Impact Factor
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H. Huang,
L. Ahrens,
J.G. Alessi,
I. Alekseev,
M. Bai,
J. Beebe-Wang,
S. Brarvar,
M. Brennan,
K.A. Brown,
G. Bunce, [......],
D. Svirida,
S. Tepikian,
D. Trbojevic,
N. Tsoupas,
D. Underwood,
J. van Zeijts,
J. Wood,
A. Zelenski,
K. Zeno,
S.Y. Zhang
[show abstract]
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ABSTRACT: Polarized proton beam has been accelerated and stored at 100GeV in Relativistic Heavy Ion Collider (RHIC) to study spin effects in the hadronic reactions. The essential equipment includes four Siberian snakes and eight spin rotators in two RHIC rings, a partial snake in the AGS, fast relative polarimeters, and ac dipoles in the AGS and RHIC. This paper summarizes the performance of RHIC as a polarized proton collider and of AGS as the injector to RHIC.
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the; 06/2003
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[show abstract]
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ABSTRACT: The longitudinal requirements for the AGS to RHIC transfer process
requires a precise control of the radius and frequency of the
circulating bunches in the AGS just before the bunch extraction from the
AGS and subsequent injection into RHIC via the ATR transfer line. In
addition the transverse beam parameters in the AGS at the location of
the Extraction kicker define the "beam-matching" between the ATR line
and RHIC. In this paper we present theoretical and experimental results
related to the longitudinal and transverse parameters of the AGS
Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001; 02/2001
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D. Trbojevic,
L. Ahrens,
M. Blaskiewicz,
M. Brennan,
M. Bai,
P. Cameron,
J. Cardona,
R. Connolly,
J. de Long,
A. Drees, [......],
J. Kewisch,
S. Peggs,
V. Ptitsyn,
T. Roser,
T. Satogata,
T. Shea,
K. Smith,
S. Tepikian,
N. Tsoupas,
J. van Zeijts
[show abstract]
[hide abstract]
ABSTRACT: This report describes in detail steps performed in bringing the
Relativistic Heavy Ion Collider (RHIC) from the commissioning into the
operational stage when collisions between 60 bunches of fully striped
gold ions, were routinely provided. Corrections of the few power supply
connections by beam measurements are described. Beam lifetime
improvements at injection, along the acceleration are shown. The beam
diagnostic results such as the Schottky detector, beam profile monitor,
beam position monitors, the tune meter and others, are shown
Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001; 02/2001
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H Huang,
L Ahrens,
J Alessi,
M Bai,
J Beebe-Wang,
K A Brown, W Glenn,
A U Luccio,
W W Mackay,
C Montag,
V Ptitsyn,
T Roser,
N Tsoupas,
A Zelenski,
K Zeno
[show abstract]
[hide abstract]
ABSTRACT: The RHIC spin design goal assumes 2 × 10 11 pro-ton/bunch with 70% polarization. As the injector to RHIC, polarized protons have been accelerated at the AGS for years to increase the polarization transmission efficiency. Several novel techniques have been applied in the AGS to overcome the intrinsic and imperfection resonances. The present level of accelerator performance is discussed. Progress on understanding the beam polarization behavior is presented. The outlook and future plan are also dis-cussed.
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J Ra Ry,
K A Brown,
L Ahrens,
R Bonati,
D Gassner, W Glenn,
H Huang,
J Morris,
S Nida,
N Tsoupas,
V Schoefer,
K Zeno
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V. RANJBAR,
L. AHRENS,
M. BAI,
K. BROWN, W. GLENN,
H. HUANG,
A. LUCCIO,
W. W. MACKAY,
V. PTITSYN,
T. ROSER,
N. TSOUPAS,
S. Y. LEE
[show abstract]
[hide abstract]
ABSTRACT: In the AGS spin resonances due to coupling may account for as much as a 50 percent loss in polarization at a reduced acceleration rate. The major source of coupling in the AGS is the solenoidal snake. In the past some preliminary work was done to understand this phenomena, and a method to overcome these resonances was attempted. However in the polarized proton run of 2002 we sought to study more thoroughly the response of these coupled spin resonances to the strength of the solenoidal snake, skew quadrupoles and vertical and horizontal betatron tune separation. In this paper we present our results and compare them with those predicted by a modified DEPOL program.
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