Quadrupole Beam-Based Alignment at RHIC

Niedziela, J.; Montag, C.; Satogata, T.

doi:10.1109/pac.2005.1591516

Cited by 5 publications

(5 citation statements)

References 8 publications

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“…In order to improve the precision of the machine, a beam-based alignment method is applied to align the magnetic centers of the quadrupole magnets and the BPMs. This beam-based alignment method has been applied at electron [6][7][8] and hadron [9,10] machines before. This procedure requires the quadrupoles to be mechanically aligned.…”

Section: Introductionmentioning

confidence: 99%

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

Wagner¹,

Nass²,

Pretz³

et al. 2021

J. Inst.

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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 40μm. Some consequences for the design of a new high precision storage ring for EDM mesasurements are discussed.

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Section: Introductionmentioning

confidence: 99%

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

Wagner¹,

Nass²,

Pretz³

et al. 2021

J. Inst.

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“…Two different quadrupole BBA approaches are described in the literature. In the first, the observable is the offset between beam trajectory and quadrupole axis [1][2][3][4]. In the second, the observable is the beam position at the BPM when it passes through the axis of the closest quadrupole [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Fast beam-based alignment using ac excitations

Martí

Benedetti

Iriso

et al. 2020

Phys. Rev. Accel. Beams

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Standard quadrupole beam-based alignment (BBA) techniques rely on orbit data and on the sequential variation of quadrupole and orbit corrector magnets (OCM). This results in time-consuming measurements of the order of several hours in most circular accelerators. Fast (10 kHz) beam position monitors (BPM) and OCMs with ac power supplies are routinely used in modern synchrotron light sources to drive fast orbit feedback systems. In this paper we show how they can be employed also to dramatically reduce the time for any quadrupole BBA to several minutes only, ensuring the same level of accuracy and precision. Moreover, conversely to the standard BBA, the new procedure accounts automatically for any level of betatron coupling, BPM roll and OCM tilt. In the case of the ALBA 3rd generation light source, the time for a complete measurement dropped from 5 hours to 10 minutes, a reduction by a factor 30. As further extension of this novel approach, an even faster skew quadrupole BBA was demonstrated in ALBA for the first time, taking advantage of the additional ac modulation of the skew quadrupole field. Results from this fully ac measurement are compared with those obtained via a traditional dc scan of the skew quadrupole.

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“…The error bars of the processed BBA results were found to be 267 mm and 171 mm in the Blue and Yellow rings, respectively. Further details on the pre-2012 runs can be found in references[4,5].…”

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confidence: 99%

“…The log is accessible online (http://www.cadops.bnl.gov/cgi-bin/elog/).3. Run-time log-files are saved automatically by the measurement script 4…”

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confidence: 99%