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Stein, H. J.; Prasuhn, D.; Stockhorst, H.; Dietrich, J.; Phan, Khiem Hong; Kamerdzhiev, V.; Maier, R.; Meshkov, I. N.; Sidorin, A. O.; Parkhomchuk, V.V.

doi:10.1023/a:1023486402224

Cited by 16 publications

(12 citation statements)

References 1 publication

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“…Electron cooling [26] and stacking injection [27] were employed, with hundreds of injections per cycle to increase the number of stored deuterons in the beam. In order to avoid excessive background coming from the interactions of the beam halo particles with the cell wall, scrapers were installed upstream of the target region.…”

Section: The Polarised Hydrogen Cell Target At Ankementioning

confidence: 99%

The neutron-proton charge-exchange amplitudes measured in the dp → ppn reaction

et al. 2013

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Abstract. The unpolarised differential cross section and the two deuteron tensor analysing powers Axx and Ayy of the dp → {pp}sn charge-exchange reaction have been measured with the ANKE spectrometer at the COSY storage ring. Using deuteron beams with energies 1.2, 1.6, 1.8, and 2.27 GeV, data were obtained for small momentum transfers to a {pp}s system with low excitation energy. The results at the three lower energies are consistent with impulse approximation predictions based upon the current knowledge of the neutron-proton amplitudes. However, at 2.27 GeV, where these amplitudes are far more uncertain, agreement requires a reduction in the overall double-spin-flip contribution, with an especially significant effect in the longitudinal direction. These conclusions are supported by measurements of the deuteronproton spin-correlation parameters Cx,x and Cy,y that were carried out in the d p → {pp}sn reaction at 1.2 and 2.27 GeV. The values obtained for the proton analysing power A p y also suggest the need for a radical reevaluation of the neutron-proton elastic scattering amplitudes at the higher energy. It is therefore clear that such measurements can provide a valuable addition to the neutron-proton database in the charge-exchange region. PACS

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Section: The Polarised Hydrogen Cell Target At Ankementioning

confidence: 99%

The neutron-proton charge-exchange amplitudes measured in the dp → ppn reaction

et al. 2013

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“…The other apparatus for this experiment, including the COSY storage ring [17][18][19][20], the EDDA polarimeter [21,22], the electron cooler [23], the low energy polarimeter [24], the injector cyclotron, and the polarized ion source [25][26][27] were shown in Fig. 4 of Ref.…”

mentioning

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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“…The apparatus used for this experiment, including the COSY storage ring [32 -35], the EDDA detector [36], the electron Cooler [37], the low energy polarimeter, the injector cyclotron, and the polarized ion source [38][39][40], are indicated in Fig. 4, along with the rf dipole.…”

Section: Cosy Experimentsmentioning

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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Cited by 16 publications

References 1 publication

The neutron-proton charge-exchange amplitudes measured in the dp → ppn reaction

The neutron-proton charge-exchange amplitudes measured in the dp → ppn reaction

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

Unexpected enhancements and reductions of rf spin resonance strengths

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