Cooler synchrotron COSY — Performance and perspectives

Maier, R.

doi:10.1016/s0168-9002(97)00324-0

Cited by 247 publications

(90 citation statements)

References 8 publications

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“…A study has been initiated with the Cooler Synchrotron (COSY) at the Forschungszentrum Jülich [3] to investigate the use of various tools, especially sextupole fields, to extend the horizontal polarization lifetime of a polarized deuteron beam. But without adding electric field plates to each bending dipole in the ring, such a study must confront the task of measuring the beam polarization as it rotates at a high rate (∼120 kHz) in the ring dipole magnetic field.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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].…”

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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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“…Beam extraction is accomplished by the conventional resonant extraction mechanism as well as with the stochastic extraction method. Proton beams are routinely delivered to three internal and three external experimental areas (1). In this paper, special emphasis is given to the measuring technique of the transverse phase space.…”

Section: Introductionmentioning

confidence: 99%

On-line phase space measurement with kicker excitation

Dietrich¹,

Maier²,

Mohos³

1998

AIP Conference Proceedings

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Abstract.A new method for on-line phase space measurements with kicker excitation at COSY was developed. The position data were measured using the analog output of two beam position monitors (BPMs) and directly monitored on a digital storage oscilloscope with an external clock (bunch-synchronous sampling). Nonlinear behavior of the proton beam was visible as well as were resonance islands. Typical measurements are presented.

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Cooler synchrotron COSY — Performance and perspectives

Cited by 247 publications

References 8 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

On-line phase space measurement with kicker excitation

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