Erratum: Synchrotron oscillation effects on an rf-solenoid spin resonance [Phys. Rev. ST Accel. Beams<b>15</b>, 124202 (2012)]

Benati, P.; Chiladze, D.; Dietrich, J.; Gaisser, M.; Gebel, R.; Guidoboni, Greta; Hejny, V.; Kacharava, A.; Kamerdzhiev, V.; Kulessa, P.; Lehrach, A.; Lenisa, P.; Lorentz, B.; Maier, R.; Mchedlishvili, D.; Morse, W. M.; Öllers, D.; Pesce, A.; Polyanskiy, A.; Prasuhn, D.; Rathmann, F.; Semertzidis, Y. K.; Stephenson, E. J.; Stockhorst, H.; Ströher, H.; Talman, R.; Valdau, Yu.; Weidemann, Christian; Wüstner, P.

doi:10.1103/physrevstab.16.049901

Cited by 14 publications

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“…The spin tune cannot be estimated with this reliability from the values of the spin tune and rf-cavity frequencies, which are typically known only to about AE1 Hz [4]. For the analysis shown in this paper, a central value of the spin tune was chosen to be ν S ¼ 0.160975 based on measurements sensitive to the location of the resonance.…”

Section: Online Data Processingmentioning

confidence: 99%

“…If the solenoid frequency is on the ð1 − GγÞf CYC resonance within a tolerance of about 1 Hz, then it will precess the vertical polarization toward the horizontal plane, at which time the solenoid strength is ramped to zero. [Alternatively, the solenoid frequency can begin near (typically within 10 to 100 Hz) the resonant frequency ð1 − GγÞf CYC (about 871434 Hz), where f CYC ¼ 750602.5 Hz is the cyclotron frequency, and ramp until the center of the resonance is reached and the vertical polarization has precessed into the horizontal plane [4]. Ramping speeds are typically 5 to 40 Hz=s with a peak rf-solenoid strength of >2 × 10 −5 rev=turn, more than enough to completely flip the polarization.]…”

Section: Online Data Processingmentioning

confidence: 99%

“…Beams 17, 052803 (2014) 052803-2 (COSY) located at the Forschungszentrum Jülich [3]. Many details of the storage ring properties relevant to these studies have been discussed previously by Benati [4]. The deuteron momentum was selected to produce a relatively clean signal of elastic scattering on carbon in the double-layered outer scintillator array of the EDDA (Elastic Dibaryons, Dead or Alive?)…”

Section: A Beam and Polarimeter Setupmentioning

confidence: 99%

“…The first step in beam preparation was to electron cool the beam, shrinking both horizontal and vertical emittance as well as the momentum spread associated with the synchrotron oscillations of a bunched beam. About 30 s were needed to achieve equilibrium in the cooled beam [4]. Then the cooling was turned off and white noise was applied to a pair of horizontal electric field plates for 10 s to increase only the horizontal emittance.…”

Section: A Introductionmentioning

confidence: 99%

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Measuring the polarization of a rapidly precessing deuteron beam

Bagdasarian¹,

Bertelli²,

Chiladze³

et al. 2014

Phys. Rev. ST Accel. Beams

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This paper describes a time-marking system that enables a measurement of the in-plane (horizontal) polarization of a 0.97-GeV=c deuteron beam circulating in the Cooler Synchrotron (COSY) at the Forschungszentrum Jülich. The clock time of each polarimeter event is used to unfold the 120-kHz spin precession and assign events to bins according to the direction of the horizontal polarization. After accumulation for one or more seconds, the down-up scattering asymmetry can be calculated for each direction and matched to a sinusoidal function whose magnitude is proportional to the horizontal polarization. This requires prior knowledge of the spin tune or polarization precession rate. An initial estimate is refined by resorting the events as the spin tune is adjusted across a narrow range and searching for the maximum polarization magnitude. The result is biased toward polarization values that are too large, in part because of statistical fluctuations but also because sinusoidal fits to even random data will produce sizable magnitudes when the phase is left free to vary. An analysis procedure is described that matches the time dependence of the horizontal polarization to templates based on emittance-driven polarization loss while correcting for the positive bias. This information will be used to study ways to extend the horizontal polarization lifetime by correcting spin tune spread using ring sextupole fields and thereby to support the feasibility of searching for an intrinsic electric dipole moment using polarized beams in a storage ring. This paper is a combined effort of the Storage Ring EDM collaboration and the JEDI collaboration.

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Section: Online Data Processingmentioning

confidence: 99%

Section: Online Data Processingmentioning

confidence: 99%

Section: A Beam and Polarimeter Setupmentioning

confidence: 99%

Section: A Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Measuring the polarization of a rapidly precessing deuteron beam

Bagdasarian¹,

Bertelli²,

Chiladze³

et al. 2014

Phys. Rev. ST Accel. Beams

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“…The high level of sensitivity is maintained only when the particle spins in the machine precess coherently for long periods of time (≈1000 s). In a series of recent investigations at COSY [11,12], we studied how the spin coherence time of an ensemble of particles can be increased to many hundreds of seconds through sextupole corrections, bunching, and phase-space cooling of the beam [13][14][15][16].…”

mentioning

confidence: 99%

New Method for a Continuous Determination of the Spin Tune in Storage Rings and Implications for Precision Experiments

Eversmann¹,

Hejny²,

Hinder³

et al. 2015

Phys. Rev. Lett.

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A new method to determine the spin tune is described and tested. In an ideal planar magnetic ring, the spin tune-defined as the number of spin precessions per turn-is given by ν s ¼ γG (γ is the Lorentz factor, G the gyromagnetic anomaly). At 970 MeV=c, the deuteron spins coherently precess at a frequency of ≈120 kHz in the Cooler Synchrotron COSY. The spin tune is deduced from the up-down asymmetry of deuteron-carbon scattering. In a time interval of 2.6 s, the spin tune was determined with a precision of the PRL 115, 094801 (2015) P H Y S I C A L

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Synchrotron oscillation effects for spin resonances driven by a localized oscillating rf magnetic field

Mane

2013

Nuclear Instruments and Methods in Physics Research Section A:

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Erratum: Synchrotron oscillation effects on an rf-solenoid spin resonance [Phys. Rev. ST Accel. Beams15, 124202 (2012)]

Cited by 14 publications

References 0 publications

Measuring the polarization of a rapidly precessing deuteron beam

Measuring the polarization of a rapidly precessing deuteron beam

New Method for a Continuous Determination of the Spin Tune in Storage Rings and Implications for Precision Experiments

Synchrotron oscillation effects for spin resonances driven by a localized oscillating rf magnetic field

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