SPIN@COSY: Spin-manipulating polarized deuterons and protons

M. A. Leonova; A. W. Chao; A. D. Krisch; V. S. Morozov; R. S. Raymond; D. W. Sivers; V. K. Wong; A. Garishvili; R. Gebel; A. Lehrach; B. Lorentz; R. Maier; D. Prasuhn; H. Stockhorst; D. Welsch; F. Hinterberger; K. Ulbrich; Ya S. Derbenev; A. M. Kondratenko; E. J. Stephenson

doi:10.1063/1.3215625

SPIN@COSY: Spin-manipulating polarized deuterons and protons

M. A. Leonova, A. W. Chao, A. D. Krisch, V. S. Morozov, R. S. Raymond, D. W. Sivers, V. K. Wong, A. Garishvili, R. Gebel, A. Lehrach, B. Lorentz, R. Maier, D. Prasuhn, H. Stockhorst, D. Welsch, F. Hinterberger, K. Ulbrich, Ya S. Derbenev, A. M. Kondratenko, E. J. Stephenson

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

We studied spin manipulation of 1.85 GeV/c polarized deuteron beam stored in COSY obtaining a spin-flip efficiency of 97 ± 1%. We first discovered experimentally and then explained theoretically interesting behavior of the deuteron tensor polarization. We, for the first time, studied systematically spin resonance strengths induced by rf dipoles and solenoids. We found huge disagreements between the strengths measured in controlled Froissart-Stora sweeps and the theoretical values calculated using the well-known formulae. These data instigated re-examination of these formulae. We tested Chao's proposed new matrix formalism for describing the spin dynamics due to a single spin resonance, which may be the first fundamental improvement of the Froissart-Stora equation in that it allows analytic calculation of the beam polarization's behavior inside a resonance. Our measurements of the deuteron's polarization near and inside the resonance agreed precisely with the Chao formalism's predicted oscillations. We tested Kondratenko's proposal to overcome depolarizing resonances by ramping through them with a crossing pattern, which should force the depolarizing contributions to cancel themselves. Our first test of this idea with 2.1 GeV/c protons was not conclusive but a later test with 1.85 GeV/c deuterons demonstrated a rather substantial reduction in the depolarization compared to the tune jump at the same rate.

Original language	English
Title of host publication	Spin Physics
Subtitle of host publication	18th International Spin Physics Symposium
Editors	Xiaochao Zheng, Yelena Prok, Matt Poelker, Donald G. Crabb, Simonetta Liuti, Donal B. Day
Publisher	American Institute of Physics Inc.
Pages	168-173
Number of pages	6
ISBN (Print)	9780735406865
DOIs	https://doi.org/10.1063/1.3215625
State	Published - Aug 4 2009
Externally published	Yes
Event	18th International Spin Physics Symposium 2008 - Charlottesville, United States Duration: Oct 6 2008 → Oct 11 2008

Publication series

Name	AIP Conference Proceedings
Volume	1149
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	18th International Spin Physics Symposium 2008
Country/Territory	United States
City	Charlottesville
Period	10/6/08 → 10/11/08

Funding

We thank the COSY staff for the successful operation of COSY, and E. D. Courant and Yu. F. Orlov for their help and advice. This research was supported by grants from the German BMBF Science Ministry, its JCHP-FFE program at COSY, the Helmholtz Association through funds provided to the virtual institute "Spin and strong QCD" (VH-VI-231), and the U.S. NSF.

Funders	Funder number
BMBF Science Ministry
U.S. NSF
Helmholtz Association	VH-VI-231

Keywords

Depolarization
Spin dynamics
Spin resonance strength

Access to Document

10.1063/1.3215625

Cite this

Leonova, M. A., Chao, A. W., Krisch, A. D., Morozov, V. S., Raymond, R. S., Sivers, D. W., Wong, V. K., Garishvili, A., Gebel, R., Lehrach, A., Lorentz, B., Maier, R., Prasuhn, D., Stockhorst, H., Welsch, D., Hinterberger, F., Ulbrich, K., Derbenev, Y. S., Kondratenko, A. M., & Stephenson, E. J. (2009). SPIN@COSY: Spin-manipulating polarized deuterons and protons. In X. Zheng, Y. Prok, M. Poelker, D. G. Crabb, S. Liuti, & D. B. Day (Eds.), Spin Physics: 18th International Spin Physics Symposium (pp. 168-173). (AIP Conference Proceedings; Vol. 1149). American Institute of Physics Inc.. https://doi.org/10.1063/1.3215625

@inproceedings{c3f3893e8b1a4664b7e062abcdc399c6,

title = "SPIN@COSY: Spin-manipulating polarized deuterons and protons",

abstract = "We studied spin manipulation of 1.85 GeV/c polarized deuteron beam stored in COSY obtaining a spin-flip efficiency of 97 ± 1%. We first discovered experimentally and then explained theoretically interesting behavior of the deuteron tensor polarization. We, for the first time, studied systematically spin resonance strengths induced by rf dipoles and solenoids. We found huge disagreements between the strengths measured in controlled Froissart-Stora sweeps and the theoretical values calculated using the well-known formulae. These data instigated re-examination of these formulae. We tested Chao's proposed new matrix formalism for describing the spin dynamics due to a single spin resonance, which may be the first fundamental improvement of the Froissart-Stora equation in that it allows analytic calculation of the beam polarization's behavior inside a resonance. Our measurements of the deuteron's polarization near and inside the resonance agreed precisely with the Chao formalism's predicted oscillations. We tested Kondratenko's proposal to overcome depolarizing resonances by ramping through them with a crossing pattern, which should force the depolarizing contributions to cancel themselves. Our first test of this idea with 2.1 GeV/c protons was not conclusive but a later test with 1.85 GeV/c deuterons demonstrated a rather substantial reduction in the depolarization compared to the tune jump at the same rate.",

keywords = "Depolarization, Spin dynamics, Spin resonance strength",

author = "Leonova, {M. A.} and Chao, {A. W.} and Krisch, {A. D.} and Morozov, {V. S.} and Raymond, {R. S.} and Sivers, {D. W.} and Wong, {V. K.} and A. Garishvili and R. Gebel and A. Lehrach and B. Lorentz and R. Maier and D. Prasuhn and H. Stockhorst and D. Welsch and F. Hinterberger and K. Ulbrich and Derbenev, {Ya S.} and Kondratenko, {A. M.} and Stephenson, {E. J.}",

note = "Publisher Copyright: {\textcopyright} 2009 American Institute of Physics.; 18th International Spin Physics Symposium 2008 ; Conference date: 06-10-2008 Through 11-10-2008",

year = "2009",

month = aug,

day = "4",

doi = "10.1063/1.3215625",

language = "English",

isbn = "9780735406865",

series = "AIP Conference Proceedings",

publisher = "American Institute of Physics Inc.",

pages = "168--173",

editor = "Xiaochao Zheng and Yelena Prok and Matt Poelker and Crabb, {Donald G.} and Simonetta Liuti and Day, {Donal B.}",

booktitle = "Spin Physics",

}

Leonova, MA, Chao, AW, Krisch, AD, Morozov, VS, Raymond, RS, Sivers, DW, Wong, VK, Garishvili, A, Gebel, R, Lehrach, A, Lorentz, B, Maier, R, Prasuhn, D, Stockhorst, H, Welsch, D, Hinterberger, F, Ulbrich, K, Derbenev, YS, Kondratenko, AM & Stephenson, EJ 2009, SPIN@COSY: Spin-manipulating polarized deuterons and protons. in X Zheng, Y Prok, M Poelker, DG Crabb, S Liuti & DB Day (eds), Spin Physics: 18th International Spin Physics Symposium. AIP Conference Proceedings, vol. 1149, American Institute of Physics Inc., pp. 168-173, 18th International Spin Physics Symposium 2008, Charlottesville, United States, 10/6/08. https://doi.org/10.1063/1.3215625

SPIN@COSY: Spin-manipulating polarized deuterons and protons. / Leonova, M. A.; Chao, A. W.; Krisch, A. D. et al.
Spin Physics: 18th International Spin Physics Symposium. ed. / Xiaochao Zheng; Yelena Prok; Matt Poelker; Donald G. Crabb; Simonetta Liuti; Donal B. Day. American Institute of Physics Inc., 2009. p. 168-173 (AIP Conference Proceedings; Vol. 1149).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - SPIN@COSY

T2 - 18th International Spin Physics Symposium 2008

AU - Leonova, M. A.

AU - Chao, A. W.

AU - Krisch, A. D.

AU - Morozov, V. S.

AU - Raymond, R. S.

AU - Sivers, D. W.

AU - Wong, V. K.

AU - Garishvili, A.

AU - Gebel, R.

AU - Lehrach, A.

AU - Lorentz, B.

AU - Maier, R.

AU - Prasuhn, D.

AU - Stockhorst, H.

AU - Welsch, D.

AU - Hinterberger, F.

AU - Ulbrich, K.

AU - Derbenev, Ya S.

AU - Kondratenko, A. M.

AU - Stephenson, E. J.

PY - 2009/8/4

Y1 - 2009/8/4

N2 - We studied spin manipulation of 1.85 GeV/c polarized deuteron beam stored in COSY obtaining a spin-flip efficiency of 97 ± 1%. We first discovered experimentally and then explained theoretically interesting behavior of the deuteron tensor polarization. We, for the first time, studied systematically spin resonance strengths induced by rf dipoles and solenoids. We found huge disagreements between the strengths measured in controlled Froissart-Stora sweeps and the theoretical values calculated using the well-known formulae. These data instigated re-examination of these formulae. We tested Chao's proposed new matrix formalism for describing the spin dynamics due to a single spin resonance, which may be the first fundamental improvement of the Froissart-Stora equation in that it allows analytic calculation of the beam polarization's behavior inside a resonance. Our measurements of the deuteron's polarization near and inside the resonance agreed precisely with the Chao formalism's predicted oscillations. We tested Kondratenko's proposal to overcome depolarizing resonances by ramping through them with a crossing pattern, which should force the depolarizing contributions to cancel themselves. Our first test of this idea with 2.1 GeV/c protons was not conclusive but a later test with 1.85 GeV/c deuterons demonstrated a rather substantial reduction in the depolarization compared to the tune jump at the same rate.

AB - We studied spin manipulation of 1.85 GeV/c polarized deuteron beam stored in COSY obtaining a spin-flip efficiency of 97 ± 1%. We first discovered experimentally and then explained theoretically interesting behavior of the deuteron tensor polarization. We, for the first time, studied systematically spin resonance strengths induced by rf dipoles and solenoids. We found huge disagreements between the strengths measured in controlled Froissart-Stora sweeps and the theoretical values calculated using the well-known formulae. These data instigated re-examination of these formulae. We tested Chao's proposed new matrix formalism for describing the spin dynamics due to a single spin resonance, which may be the first fundamental improvement of the Froissart-Stora equation in that it allows analytic calculation of the beam polarization's behavior inside a resonance. Our measurements of the deuteron's polarization near and inside the resonance agreed precisely with the Chao formalism's predicted oscillations. We tested Kondratenko's proposal to overcome depolarizing resonances by ramping through them with a crossing pattern, which should force the depolarizing contributions to cancel themselves. Our first test of this idea with 2.1 GeV/c protons was not conclusive but a later test with 1.85 GeV/c deuterons demonstrated a rather substantial reduction in the depolarization compared to the tune jump at the same rate.

KW - Depolarization

KW - Spin dynamics

KW - Spin resonance strength

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U2 - 10.1063/1.3215625

DO - 10.1063/1.3215625

M3 - Conference contribution

AN - SCOPUS:85054413142

SN - 9780735406865

T3 - AIP Conference Proceedings

SP - 168

EP - 173

BT - Spin Physics

A2 - Zheng, Xiaochao

A2 - Prok, Yelena

A2 - Poelker, Matt

A2 - Crabb, Donald G.

A2 - Liuti, Simonetta

A2 - Day, Donal B.

PB - American Institute of Physics Inc.

Y2 - 6 October 2008 through 11 October 2008

ER -

SPIN@COSY: Spin-manipulating polarized deuterons and protons

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