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Title: 20% PARTIAL SIBERIAN SNAKE IN THE AGS.

Abstract

An 11.4% partial Siberian snake was used to successfully accelerate polarized proton through a strong intrinsic depolarizing spin resonance in the AGS. No noticeable depolarization was observed. This opens up the possibility of using a 20% to 30% partial Siberian snake in the AGS to overcome all weak and strong depolarizing spin resonances. Some design and operation issues of the new partial Siberian snake are discussed.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
BROOKHAVEN NATIONAL LABORATORY (US)
Sponsoring Org.:
DOE/SC (US)
OSTI Identifier:
15006594
Report Number(s):
BNL-71492-2003-CP
R&D Project: AD003; KB0202011; TRN: US0400863
DOE Contract Number:
AC02-98CH10886
Resource Type:
Conference
Resource Relation:
Conference: WORKSHOP ON INCREASING THE AGS POLARIZATION, ANN ARBOR, MI (US), 11/06/2002--11/09/2002; Other Information: PBD: 6 Nov 2002
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; POLARIZATION; BROOKHAVEN AGS; BEAM DYNAMICS

Citation Formats

Huang, H, Bai, M, Brown, K A, Glenn, W, Luccio, A U, Mackay, W W, Montag, C, Ptitsyn, V, Roser, T, Tsoupas, N, Zeno, K, Ranjbar, V, Spinka, H, and Underwood, D. 20% PARTIAL SIBERIAN SNAKE IN THE AGS.. United States: N. p., 2002. Web.
Huang, H, Bai, M, Brown, K A, Glenn, W, Luccio, A U, Mackay, W W, Montag, C, Ptitsyn, V, Roser, T, Tsoupas, N, Zeno, K, Ranjbar, V, Spinka, H, & Underwood, D. 20% PARTIAL SIBERIAN SNAKE IN THE AGS.. United States.
Huang, H, Bai, M, Brown, K A, Glenn, W, Luccio, A U, Mackay, W W, Montag, C, Ptitsyn, V, Roser, T, Tsoupas, N, Zeno, K, Ranjbar, V, Spinka, H, and Underwood, D. Wed . "20% PARTIAL SIBERIAN SNAKE IN THE AGS.". United States. doi:. https://www.osti.gov/servlets/purl/15006594.
@article{osti_15006594,
title = {20% PARTIAL SIBERIAN SNAKE IN THE AGS.},
author = {Huang, H and Bai, M and Brown, K A and Glenn, W and Luccio, A U and Mackay, W W and Montag, C and Ptitsyn, V and Roser, T and Tsoupas, N and Zeno, K and Ranjbar, V and Spinka, H and Underwood, D},
abstractNote = {An 11.4% partial Siberian snake was used to successfully accelerate polarized proton through a strong intrinsic depolarizing spin resonance in the AGS. No noticeable depolarization was observed. This opens up the possibility of using a 20% to 30% partial Siberian snake in the AGS to overcome all weak and strong depolarizing spin resonances. Some design and operation issues of the new partial Siberian snake are discussed.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Nov 06 00:00:00 EST 2002},
month = {Wed Nov 06 00:00:00 EST 2002}
}

Conference:
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  • We are building a 4.7 Tesla-meter room temperature solenoid to be installed in a 10-foot long AGS straight section. This experiment will test the idea of using a partial snake to correct all depolarizing imperfection resonances and also test the feasibility of betatron tune jump in correction intrinsic resonances in the presence of a partial snake.
  • A 9{degree} solenoidal spin rotator or 5{percent} partial Siberian snake was used to successfully accelerate polarized protons for the first time to 10.8 GeV kinetic energy in the Brookhaven AGS. It was found that a 5{percent} partial snake can effectively overcome 18 imperfection resonances in this energy range. We also observed an interference between the spin flip induced by an intrinsic resonance and linear coupling due to the solenoid field of the partial snake. {copyright} {ital 1995 American Institute of Physics.}
  • Recent experiments at the Indiana University Cyclotron Facility (IUCF) have demonstrated that Siberian Snakes'' can be used to preserve the polarization of an accelerated polarized beam in a circular accelerator. Retrofitting full snakes into accelerators such as the Alternating Gradient Synchrotron (AGS) at Brookhaven is almost impossible due to space limitations, but a partial snake that can correct depolarization due to imperfection resonances with 1/20 to 1/30 of a full strength snake seems to present a viable option. We describe such a device for the AGS and give the design criteria in terms of simplicity of accelerator operation and levelmore » of achievable polarization. 2 refs., 5 figs., 1 tab.« less
  • Two partial helical dipole snakes were found to be able to overcome all imperfection and intrinsic spin resonances provided that the vertical betatron tunes were maintained in the spin tune gap near the integer 9. Recent vertical betatron tune scan showed that the two weak resonances at the beginning of the acceleration cycle may be the cause of polarization loss. This result has been confirmed by the vertical polarization profile measurement, and spin tracking simulations. Possible cure of the remaining beam polarization is discussed.
  • Based on snake experiments at the Indian University Cyclotron Facility and computer simulations at Brookhaven National Laboratory, as well as the conclusions of a BNL mini-workshop, we feel that a partial Siberian snake is a practical device for the AGS. It is anticipated that such a device could reduce the polarized beam tune-up time from 2--3 weeks to 2--3 days.