Beam-based alignment tests at the Cooler Synchrotron (COSY)

Wagner, Tim

doi:10.1007/s10751-018-1539-6

Cited by 6 publications

(7 citation statements)

References 1 publication

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“…The S-BPMs will be used to reduce the external B-field and the magnetic quadrupole position tolerance by modulating the vertical tune and by using beam-based alignment. [36,37]…”

Section: Ring Lattice Designmentioning

confidence: 99%

“…The total experiment duration is assumed to be 4 × 10 7 s, meaning approximately 4 × 10 4 fills, resulting to an unwanted maximum vertical spin precession rate of ≈ 0.75 nrad/s, corresponding to an EDM of 0.75×10 −29 e•cm in the same ring. A 10µm resolution in the position of the quadrupoles has been demonstrated using beam-based alignment in DC-mode in hadronic storage rings [37], while the S-BPMs and the method we have developed to probe the average separation of the CR beams, have much better resolution than that.…”

Section: Position Tolerances Of Ring Elementsmentioning

confidence: 99%

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Storage Ring Probes of Dark Matter and Dark Energy

Graham,

Haciomeroglu,

Kaplan

et al. 2020

Preprint

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We show that proton storage ring experiments designed to search for proton electric dipole moments can also be used to look for the nearly dc spin precession induced by dark energy and ultra-light dark matter. These experiments are sensitive to both axion-like and vector fields. Current technology permits probes of these phenomena up to three orders of magnitude beyond astrophysical limits. The relativistic boost of the protons in these rings allows this scheme to have sensitivities comparable to atomic comagnetometer experiments that can also probe similar phenomena. These complementary approaches can be used to extract the micro-physics of a signal, allowing us to distinguish between pseudo-scalar, magnetic and electric dipole moment interactions.

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“…The S-BPMs will be used to reduce the external B-field and the magnetic quadrupole position tolerance by modulating the vertical tune and by using beam-based alignment. [36,37]…”

Section: Ring Lattice Designmentioning

confidence: 99%

Section: Position Tolerances Of Ring Elementsmentioning

confidence: 99%

Storage Ring Probes of Dark Matter and Dark Energy

Graham,

Haciomeroglu,

Kaplan

et al. 2020

Preprint

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“…[13,Historical background] At present, a number of studies with polarized beams are carried out at COSY with the upshot of developing a future EDM experiment for an electrostatic storage ring. [36,37,15,38,39,40] In most studies, parameters summarized in Table 3.1 are used. The author would like to highlight the following technologies developed…”

Section: Formulation Bmentioning

confidence: 99%

“…Beam Based Alignment [40] is a procedure to verify that the beam passes through the center of a quadrupole. In order to so do, one varies the strength of the quadrupole and observes the changes this affects in the closed orbit.…”

Section: Beam Based Alignmentmentioning

confidence: 99%

2D Frozen spin method of searching for the deuteron EDM in a storage ring

Aksentev¹

2019

Preprint

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The purpose of the present work is the development of a method for searching the electric dipole moment (EDM) of the deuteron inside the storage ring environment using the frozen spin method. The 2D frozen spin method is a variation on the original frozen spin method proposed at Brookhaven National Laboratory, in which the beam polarisation vector freely precesses in the vertical plane. One distinguishing feature of the 2D frozen spin method, is that it uses the radial magnetic fields induced by the accelerator optical lattice's imperfections to drive the vertical plane precession. The net electric + magnetic dipole moment spin precession frequency is measured. The EDM estimator is constructed as the sum of the net frequency estimates in two cases: when the beam circulates clockwise (CW), and when it does counter-clockwise (CCW). For the deuteron, since the experiment is performed in a combined ring, the beam circulation direction change requires flipping the polarity of the guiding magnetic field. When this is done, the imperfection fields change their sign as well, and so does the magnetic dipole moment (MDM) component of the spin precession angular velocity vector. Therefore, theoretically, the MDM term cancels in the EDM estimator. The trick is to calibrate the MDM precession frequency with sufficient precision. For that purpose, the concept of the effective Lorentz factor was introduced. We try to prove that particles having equal values of the effective Lorentz factor have equal spin tunes (and invariant spin axis orientations as well), and therefore, by controlling a single parameter -- the effective Lorentz factor -- it is possible to calibrate the MDM component of the precession frequency. A special calibration procedure is numerically modelled, with the conclusion that it allows sufficiently precise MDM spin precession frequency reproduction. Three major systematic effects of spin dynamics have been analysed: 1) perturbations to the particle spin dynamics caused by betatron oscillations, 2) spin decoherence in the zero spin resonance (frozen spin) region, 3) properties of the machine imperfection MDM spin precession angular velocity. We conclude that the first systematic effect is negligible; analyse the sextupole field approach to suppressing spin decoherence, and find it effective; find that the imperfections systematic error is linear, but asymmetric with respect to the beam circulation direction, which is more motivation for using the effective Lorentz factor as the tool for calibrating the MDM spin precession frequency. Overall, we find the proposed method effective.

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“…Several tests were performed to determine the effect of a full beambased alignment survey of all quadrupoles in the accelerator. The first two tests [8,9] showed that the offset between the quadrupoles and BPMs amounts to several mm. Thus the beam-based alignment measurement has to be performed for all quadrupoles in the accelerator in order to have all BPMs properly calibrated.…”

Section: Introductionmentioning

confidence: 99%

Beam-based alignment at the Cooler Synchrotron COSY as a prerequisite for an electric dipole moment measurement

Wagner,

Nass,

Pretz

et al. 2020

Preprint

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The Jülich Electric Dipole moment Investigation (JEDI) collaboration aims at a direct measurement of the Electric Dipole Moment (EDM) of protons and deuterons using a storage ring. The measurement is based on a polarization measurement. In order to reach highest accuracy, one has to know the exact trajectory through the magnets, especially the quadrupoles, to avoid the influence of magnetic fields on the polarization vector. In this paper, the development of a beam-based alignment technique is described that was developed and implemented at the COoler SYnchrotron (COSY) at Forschungszentrum Jülich. Well aligned quadrupoles permit one to absolutely calibrate the Beam Position Monitors (BPMs). The method is based on the fact that a particle beam which does not pass through the center of a quadrupole experiences a deflection. The precision reached by the method is approximately 40 µm.

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Beam-based alignment tests at the Cooler Synchrotron (COSY)

Cited by 6 publications

References 1 publication

Storage Ring Probes of Dark Matter and Dark Energy

Storage Ring Probes of Dark Matter and Dark Energy

2D Frozen spin method of searching for the deuteron EDM in a storage ring

Beam-based alignment at the Cooler Synchrotron COSY as a prerequisite for an electric dipole moment measurement

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