The BLAST project at MIT-Bates

Alarcón, R.

doi:10.1007/s10582-002-0144-7

Cited by 8 publications

(10 citation statements)

References 16 publications

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“…Polarized beam experiments at storage rings [1][2][3][4][5] need the ability to precisely control the beam's polarization. A stored beam's polarization can be manipulated in a wellcontrolled way by ramping an rf magnet's frequency through an rf-induced spin resonance.…”

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confidence: 99%

Experimental Verification of Predicted Beam-Polarization Oscillations near a Spin Resonance

et al. 2008

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The Chao matrix formalism allows analytic calculations of a beam's polarization behavior inside a spin resonance. We recently tested its prediction of polarization oscillations occurring in a stored beam of polarized particles near a spin resonance. Using a 1:85 GeV=c polarized deuteron beam stored in the COoler SYnchrotron, we swept a new rf solenoid's frequency rather rapidly through 400 Hz during 100 ms, while varying the distance between the sweep's end frequency and the central frequency of an rf-induced spin resonance. Our measurements of the deuteron's polarization near and inside the resonance agree with the Chao formalism's predicted oscillations.

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confidence: 99%

Experimental Verification of Predicted Beam-Polarization Oscillations near a Spin Resonance

et al. 2008

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“…Polarized beam experiments have become an important part of the programs in storage rings such as the IUCF Cooler Ring [1], AmPS at NIKHEF [2], the MIT-Bates Storage Ring [3], COSY [4], LEP at CERN [5], RHIC at BNL [6] and HERA at DESY [7,8]. To reduce their systematic errors, polarized scattering experiments require frequent spin-direction reversals (spin flips) while the polarized beam is stored.…”

Section: Introductionmentioning

confidence: 99%

Unexpected enhancements and reductions of rf spin resonance strengths

Леонова

Morozov

Krisch

et al. 2006

Phys. Rev. ST Accel. Beams

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We recently analyzed all available data on spin-flipping stored beams of polarized protons, electrons, and deuterons. Fitting the modified Froissart-Stora equation to the measured polarization data after crossing an rf-induced spin resonance, we found 10 -20-fold deviations from the depolarizing resonance strength equations used for many years. The polarization was typically manipulated by linearly sweeping the frequency of an rf dipole or rf solenoid through an rf-induced spin resonance; spin-flip efficiencies of up to 99:9% were obtained. The Lorentz invariance of an rf dipole's transverse R Bdl and the weak energy dependence of its spin resonance strength E together imply that even a small rf dipole should allow efficient spin flipping in 100 GeV or even TeV storage rings; thus, it is important to understand these large deviations. Therefore, we recently studied the resonance strength deviations experimentally by varying the size and vertical betatron tune of a 2:1 GeV=c polarized proton beam stored in COSY. We found no dependence of E on beam size, but we did find almost 100-fold enhancements when the rf spin resonance was near an intrinsic spin resonance.

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“…During the past decade, polarized beam experiments have become an important part of the programs in storage rings such as the IUCF Cooler Ring [1], AmPS at NIKHEF [2], the MIT-Bates Storage Ring [3], COSY [4], LEP at CERN [5], RHIC at BNL [6], and HERA at DESY [7,8]. Many polarized scattering experiments require frequent spin-direction reversals (spin flips), while the polarized beam is stored, to reduce their systematic errors.…”

Section: Introductionmentioning

confidence: 99%

Spin manipulation of1.94 GeV/cpolarized protons stored in the COSY cooler synchrotron

Morozov

Krisch

Леонова

et al. 2004

Phys. Rev. ST Accel. Beams

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We recently studied spin flipping of a 1:94 GeV=c vertically polarized proton beam at COSY in Jülich, Germany. We swept an rf-dipole's frequency through an rf-induced spin resonance to flip the beam's polarization direction. After determining the resonance's frequency, we varied the dipole's strength, frequency range, and frequency ramp time. At the rf-dipole's maximum strength, and optimum frequency range and ramp time, we measured a spin-flip efficiency of 99:3% 0:1%. This result indicates that an rf dipole may allow efficient spin flipping in high energy proton rings.

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The BLAST project at MIT-Bates

Cited by 8 publications

References 16 publications

Experimental Verification of Predicted Beam-Polarization Oscillations near a Spin Resonance

Experimental Verification of Predicted Beam-Polarization Oscillations near a Spin Resonance

Unexpected enhancements and reductions of rf spin resonance strengths

Spin manipulation of1.94 GeV/cpolarized protons stored in the COSY cooler synchrotron

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