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L. G. Ratner,
P. F. Schultz,
J. R. O'Fallon,
K. Abe,
D. G. Crabb,
R. C. Fernow,
P. H. Hansen,
A. D. Krisch,
T. A. Mulera,
A. J. Salthouse,
B. Sandler, K. M. Terwilliger,
A. Lin
01/2006: pages 125-128;
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F. Z. Khiari,
P. R. Cameron,
G. R. Court,
D. G. Crabb,
M. Fujisaki,
I. Gialas,
P. H. Hansen,
M. E. Hejazifar,
A. D. Krisch,
A. M. T. Lin, [......],
J. B. Roberts,
G. C. Phillips,
V. W. Hughes,
P. Schüler,
J. A. Bywater,
R. L. Martin,
J. R. O’Fallon,
T. S. Bhatia,
L. C. Northcliffe,
M. Simonius
[show abstract]
[hide abstract]
ABSTRACT: Accelerating polarized protons to 22 GeV/c at the Brookhaven Alternating Gradient Synchro- tron required both extensive hardware modifications and a difficult commissioning process. We had to overcome 45 strong depolarizing resonances to maintain polarization up to 22 GeV/c in this strong-focusing synchrotron. At 18.5 GeV/c we measured the analyzing power A and the spin-spin correlation parameter Ann in large- P⊥2 proton-proton elastic scattering, using the polarized proton beam and a polarized proton target. We also obtained a high-precision measurement of A at P⊥2=0.3 (GeV/c)2 at 13.3 GeV/c. At 18.5 GeV/c we found that Ann=(-2±16)% at P⊥2=4.7 (GeV/c)2, where it was about 60% near 12 GeV at the Argonne Zero Gradient Synchrotron. This sharp change suggests that spin-spin forces may have a strong and unexpected energy dependence at high P⊥2.
Phys. Rev. D. 12/1988; 39(1).
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P. R. Cameron,
D. G. Crabb,
G. E. Demuth,
F. Z. Khiari,
A. D. Krisch,
A. M. Lin,
R. S. Raymond,
T. Roser, K. M. Terwilliger,
K. A. Brown,
G. T. Danby,
L. G. Ratner,
J. R. O'fallon,
D. C. Peaslee,
J. B. Roberts,
T. S. Bhatia,
M. Simonius
[show abstract]
[hide abstract]
ABSTRACT: The spin analyzing power A in 28-GeV/c proton-proton elastic scattering
was measured at P⊥ 2=6.5 (GeV/c)2
using a polarized proton target and a high-intensity unpolarized proton
beam at the Brookhaven National Laboratory Alternating Gradient
Synchrotron. The result of (24+/-8)% confirms that the analyzing power
is large and rising in the large-P⊥ 2 region.
Physical review D: Particles and fields 11/1985; 32:3070-3072.
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L.G. Ratner,
H Brown,
I-H Chiang,
E. Courant,
C. Gardner,
D. Lazarus,
Y.Y. Lee,
Y. Makdisi,
S. Sidhu,
J. Skelly,
R. Thern,
P Cameron,
D. G. Crabb,
A. D. Krisch,
R. Raymond, K. M. Terwilliger,
J. B. Roberts
IEEE Transactions on Nuclear Science 11/1985; 32(5):1656-1658. · 1.45 Impact Factor
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[show abstract]
[hide abstract]
ABSTRACT: While accelerating polarized protons in the Brookhaven AGS we found a variant of the standard imperfection and intrinsic depolarizing resonances which has some of the properties of both types. Imperfection resonances occur at G¿ = k, when the number of spin precessions per revolution, G¿, equals a harmonic of the depolarizing field, k. Intrinsic resonances occur at G¿ = nP±¿Z, when the AGS gradient periodicities, nP, modulate free vertical betatron oscillations to create the sum and difference frequencies. The variant resonance is a beat between nP and an imperfection driven betatron oscillation of periodicity k'. These occur at G¿ = nP±k', and are strongest when the driven betatron oscillation is largest. The effect was most dramatic at the strong G¿ = 27 resonance. Since ¿Z = 8.8 for the AGS, and there is a major nP = 36 AGS periodicity, a strong beat resonance should exist at G¿ = 36-9 = 27. Applying a 27th harmonic correction directly was unsuccessful, but a 9th harmonic correction removed the depolarization.
IEEE Transactions on Nuclear Science 11/1985; · 1.45 Impact Factor
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D. G. Crabb,
B. Bonner,
J. Buchanan,
J. A. Bywater,
P. R. Cameron,
M. Fujisaki,
M. E. Hejazifar,
A. D. Krisch,
S. L. Linn,
A. Perlmutter,
G. Phillips,
L. G. Ratner,
J. Rice,
J. B. Roberts, K. M. Terwilliger
[show abstract]
[hide abstract]
ABSTRACT: This report describes the three polarimeters which will be used to measure the beam polarization at the AGS polarized beam facility. The beam polarization will be measured before injection into the AGS, during acceleration, and after extraction from the AGS. The 200 MeV polarimeter uses scintillation counter telescopes to measure the asymmetry in p-carbon inclusive scattering. The internal polarimeter can measure the beam polarization at up to five selected times during acceleration. A continuously spooled nylon filament is swung into the beam at the appropriate time and the asymmetry in pp elastic scattering measured by two scintillation counter telescopes. This is a relative polarimeter which can be calibrated by the absolute external polarimeter located in the "D" extracted beam line. This polarimeter uses scintillation counters in two double-arm magnetic spectrometers to measure clearly the asymmetry in pp elastic scattering from a liquid hydrogen target. The specific features and operation of each polarimeter will be discussed.
IEEE Transactions on Nuclear Science 09/1983; · 1.45 Impact Factor
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[show abstract]
[hide abstract]
ABSTRACT: The workshop sessions concentrated on polarized protons in circular accelerators and storage rings. Topics such as polarized electrons were discussed only when the subject was relevant to proton phenomena. Of major interest was the possible applicability of the new idea of spin matching for crossing depolarizing resonances. On the experimental side, some remarkable new data were presented by the SATURNE II Group. They have successfully crossed both intrinsic and imperfection depolarizing resonances by the spin flip method with minimal depolarization-the first group to do so. They also obtained some results which apparently cannot be explained with our present understanding of spin phenomena. The workshop concluded that more experimental measurements are needed to understand the physics and that such studies would be very important for the future acceleration of polarized protons at KEK and the AGS. The workshop included status reports from the four laboratories which have programs of polarized particle acceleration--or approved projects to accelerate polarized protons.
12/1981
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K. M. Terwilliger,
D. G. Crabb,
A. D. Krisch,
M. Fujisaki,
J. A. Bywater,
R. J. Lari,
L. G. Ratner,
E. D. Courant,
A. Feltman,
R. Lambiase,
Y. Y. Lee,
R. D. Rath,
L. W. Snith
[show abstract]
[hide abstract]
ABSTRACT: A multi-laboratory-university collaborative project involving Argonne, Brookhaven, Michigan, Rice and Yale is underway to accelerate polarized protons at the AGS. The success of the now turned off 12 GeV/c ZGS polarized beam and the design studies for the AGS made us confident of the feasibility of achieving a polarization of about 60% at 26 GeV/c with an intensity 1011 to 1012 protons/pulse. Such a beam would be a potential source of polarized protons for ISABELLE. This report gives a brief discussion of the overall project and describes the tests of a prototype of the fast pulsed ferrite quadrupole magnets which will jump the intrinsic depolarizing resonances.
IEEE Transactions on Nuclear Science 07/1981; · 1.45 Impact Factor
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[show abstract]
[hide abstract]
ABSTRACT: The unexpected importance of high energy spin effects and the success of the 12 GeV Argonne ZGS in jumping many intrinsic and imperfection depolarizing resonances suggests that polarized proton acceleration should be tried at higher energy. The 1977 Ann Arbor Workshop concluded that it might be possible to jump depolarizing resonances in strong focusing synchrotrons. During the past year we have evaluated the possibility of accelerating polarized protons in the Brookhaven AGS. We found that for about $2 million one could obtain a polarized ion source, fast resonance jumping magnets, and 3 polarimeters which should allow acceleration of 1011 to 1012 polarized protons to 23 GeV/c with about 70% polarization or to 26 GeV/c with about 50% polarization.
IEEE Transactions on Nuclear Science 07/1979; · 1.45 Impact Factor
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H. E. Miettinen,
K. Abe,
R. C. Fernow,
A. D. Krisch,
T. A. Mulera,
A. J. Salthouse,
B. Sandler, K. M. Terwilliger,
J. R. O'Fallon,
L. G. Ratner,
P. F. Schultz
[show abstract]
[hide abstract]
ABSTRACT: We measured the cross section for proton-proton elastic scattering at 11.75 GeV/c using the Zero Gradient Synchrotron 52% polarized proton beam and a 60% polarized proton target. We measured dσ/dt(ij) in the ↑↑, ↓↓, and ↑↓ initial spin states perpendicular to the scattering plane in the range P⊥2=2.0-3.6 (GeV/c)2. We found that the asymmetry parameter A decreases smoothly with increasing P⊥2 in this range, and that the spin-spin correlation parameter Cnn may have a minimum near P⊥2=3 (GeV/c)2.
Phys. Rev. D. 07/1977; 16(3).
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10/1972;
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[show abstract]
[hide abstract]
ABSTRACT: The elastic cross section for proton proton scattering at 6 GeV/c was measured using a 70% polarized beam and a 75% polarized target at the Argonne ZGS. In the range P[perpendicular]2 = 0.5 --> 2.0(GeV/c)2 we obtained small error measurements for the [short up arrow][short up arrow], [downwards arrow][downwards arrow] and [short up arrow][downwards arrow] initial spin states perpendicular to the scattering plane. At P[perpendicular]2 = 0.5 we also measured the recoil spin and found that the 5 different cross sections were very unequal. Peer Reviewed http://deepblue.lib.umich.edu/bitstream/2027.42/22271/1/0000710.pdf
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A. Lin,
John R. O'Fallon,
L.G. Ratner,
P. F. Schultz,
K Abe,
D. G. Crabb,
Richard C. Fernow,
A. D. Krisch,
A. J. Salthouse,
B. Sandler, K. M. Terwilliger
[show abstract]
[hide abstract]
ABSTRACT: We measured d[sigma]/dt(90[deg]cm) for [short up arrow]+p[short up arrow]-->p+p from 1.75 to 5.5 GeV/c, using the Argonne zero-gradient synchrotron 70% polarized proton beam and a 70% polarized proton target. We found that the spin-spin correlation parameter.Ann, equals 60% at low energy, then drops sharply to about 10% near 3.5 GeV/c, and remains constant up to 5.5 GeV/c. Peer Reviewed http://deepblue.lib.umich.edu/bitstream/2027.42/22614/1/0000164.pdf
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[show abstract]
[hide abstract]
ABSTRACT: The elastic cross section for proton proton scattering at 11.75 GeV/c was measured at the Argonne ZGS using a 50% polarized target. In the range p[perpendicular]2=0.6 --> 2.2 (GeV/c)2 we obtained precise measurements of d[sigma]/dt(ij) for the [two upwards arrow] [two down arrows], and [up and down arrow]; initial spin states perpendicular to the scattering plane. We confirmed that the asymmetry parameter, A, decreases with energy in the diffraction peak, but is approximately energy-independent at large p[perpendicular]2. We found that the spin correlation parameter cnn acquires rather dramatic structure, and at large p[perpendicular]2 seems to grow with energy. Peer Reviewed http://deepblue.lib.umich.edu/bitstream/2027.42/21719/1/0000111.pdf
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A. Lin,
J.R. O'Fallon,
L.G. Ratner,
P.F. Schultz,
K. Abe,
D.G. Crabb,
R.C. Fernow,
A.D. Krisch,
A.J. Salthouse,
B. Sandler, K.M. Terwilliger
[show abstract]
[hide abstract]
ABSTRACT: We measured for ↑+p↑→p+p from 1.75 to 5.5 GeV/c, using the Argonne zero-gradient synchrotron 70% polarized proton beam and a 70% polarized proton target. We found that the spin-spin correlation parameter.Ann, equals 60% at low energy, then drops sharply to about 10% near 3.5 GeV/c, and remains constant up to 5.5 GeV/c.
Physics Letters B.
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[show abstract]
[hide abstract]
ABSTRACT: The elastic cross section for proton proton scattering at 11.75 GeV/c was measured at the Argonne ZGS using a 50% polarized target. In the range p⊥2=0.6 → 2.2 (GeV/c)2 we obtained precise measurements of for the ⇈ ⇊, and ⇅ initial spin states perpendicular to the scattering plane. We confirmed that the asymmetry parameter, A, decreases with energy in the diffraction peak, but is approximately energy-independent at large p⊥2. We found that the spin correlation parameter cnn acquires rather dramatic structure, and at large p⊥2 seems to grow with energy.
Physics Letters B.
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K. A. Brown,
R. J. Bruni,
P. R. Cameron,
D. G. Crabb,
R. L. Cummings,
F. Z. Khiari,
A. D. Krisch,
A. M. T. Lin,
R. S. Raymond,
T. Roser, K. M. Terwilliger,
G. T. Danby,
L. G. Ratner,
D. C. Peaslee,
J. R. O’Fallon,
J. B. Roberts,
T. S. Bhatia,
L. C. Northcliffe,
M. Simonius
[show abstract]
[hide abstract]
ABSTRACT: Using the new Brookhaven Alternating Gradient Synchrotron polarized proton beam and our polarized proton target, we measured the spin-spin correlation parameter Ann in 16.5-GeV/c proton-proton elastic scattering. We found an Ann of (6.1±3.0)% at P⊥ 2=2.2 (GeV/c)2. We also measured the analyzing power A in two independent ways, providing a good test of possible experimental errors. Comparing our new data with 12-GeV Argonne Zero Gradient Synchrotron data shows no evidence for strong energy dependence in Ann in this medium-P⊥ 2 region.
Phys. Rev. D. 31(11).
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A. D. Krisch,
S.R. Mane,
R. S. Raymond,
T. Roser,
J.A. Stewart, K. M. Terwilliger,
B. Vuaridel,
J.E. Goodwin,
H.O. Meyer,
M. Minty,
P.V. Pancella,
R.E. Pollock,
E.D. Courant,
S Y Lee,
L.G. Ratner
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[show abstract]
[hide abstract]
ABSTRACT: The elastic cross section for proton proton scattering at 6 was measured using a 70% polarized beam and a 75% polarized target at the Argonne ZGS. In the range we obtained small error measurements for the ↑↑, ↓↓ and ↑↓ initial spin states perpendicular to the scattering plane. At P⊥2 = 0.5 we also measured the recoil spin and found that the 5 different cross sections were very unequal.
Physics Letters B.
