Review of linear optics measurement and correction for charged particle accelerators

Tomás, Rogelio; Aiba, M.; Franchi, A.; Iriso, Ubaldo

doi:10.1103/physrevaccelbeams.20.054801

Cited by 43 publications

(35 citation statements)

References 75 publications

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“…In recent years the field of optics measurement and correction is growing in interest with the design of pushed optics like the high-luminosity LHC (HL-LHC) upgrade and next generation light sources. A review of the progress in the last years is given in [1]. The original method to determine the β function from turn-by-turn phase data makes use of three adjacent beam position monitors (BPMs) [2].…”

Section: Introductionmentioning

confidence: 99%

Analytical N beam position monitor method

Wegscheider

Franchi

Tomás

et al. 2017

Phys. Rev. Accel. Beams

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Measurement and correction of focusing errors is of great importance for performance and machine protection of circular accelerators. Furthermore LHC needs to provide equal luminosities to the experiments ATLAS and CMS. High demands are also set on the speed of the optics commissioning, as the foreseen operation with β Ã-leveling on luminosity will require many operational optics. A fast measurement of the β-function around a storage ring is usually done by using the measured phase advance between three consecutive beam position monitors (BPMs). A recent extension of this established technique, called the N-BPM method, was successfully applied for optics measurements at CERN, ALBA, and ESRF. We present here an improved algorithm that uses analytical calculations for both random and systematic errors and takes into account the presence of quadrupole, sextupole, and BPM misalignments, in addition to quadrupolar field errors. This new scheme, called the analytical N-BPM method, is much faster, further improves the measurement accuracy, and is applicable to very pushed beam optics where the existing numerical N-BPM method tends to fail.

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Section: Introductionmentioning

confidence: 99%

Analytical N beam position monitor method

Wegscheider

Franchi

Tomás

et al. 2017

Phys. Rev. Accel. Beams

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“…They were successfully commissioned with beam on 26 October 2017. The β functions were measured and corrected (to a β-beating level below 10% [15]). The aperture was found to be tight but still sufficient for direct injection, and no abnormal losses were observed.…”

Section: High-β * Optics For Low Energymentioning

confidence: 99%

High-Beta Optics and Running Prospects

Burkhardt

2019

Instruments

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Dedicated high-beta optics are used to make forward proton scattering measurements possible at the LHC. Following a short general introduction and history of special high-beta optics and running conditions, we describe the two types of special high-beta runs planned for 2018. A run at top energy at β y * = 90 m for elastic and diffractive scattering, and a low energy run to measure the rho-parameter in the Coulomb interference region.

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“…Many techniques exist to do this, the majority of which use either the turn-by-turn beam position monitor (BPM) or closedorbit response matrix data to extract information on the underlying machine optics [16]. At Diamond, the standard technique is to use a modified version of the Linear Optics from Closed Orbit (LOCO) algorithm which has been optimized for speed of execution [17,18].…”

Section: Machine Characterization a Linear Opticsmentioning

confidence: 99%

Characterization of the double-double bend achromat lattice modification to the Diamond Light Source storage ring

Martin¹,

Apollonio²,

Fielder³

et al. 2018

Phys. Rev. Accel. Beams

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The Diamond storage ring has recently been modified by replacing one of the original double bend achromat (DBA) cells with a double-DBA (DDBA) cell. The new cell marks a fundamental break to the machine symmetry, and the final engineered solution shares many design features in common with modern multi-bend achromat cells. In this paper we review the impact that the modification has had on the linear and nonlinear optics, collective effects, and overall performance. Where appropriate, comparison to model predictions are also made.

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Review of linear optics measurement and correction for charged particle accelerators

Cited by 43 publications

References 75 publications

Analytical N beam position monitor method

Analytical N beam position monitor method

High-Beta Optics and Running Prospects

Characterization of the double-double bend achromat lattice modification to the Diamond Light Source storage ring

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