Analytical 
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 beam position monitor method

Wegscheider, Andreas; Franchi, A.; Tomás, Rogelio; Langner, Andy

doi:10.1103/physrevaccelbeams.20.111002

Cited by 17 publications

(10 citation statements)

References 11 publications

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“…Linear optics studies are specially focused on the analysis of amplitude and phase corresponding to the main line of the spectrum, associated to the driven tune. In this section we focus on the β from amplitude technique, as its random and systematic errors are not addressed elsewhere, contrary to β from phase [21][22][23][24]. For the ith BPM, true amplitude and phase are related to the beam position, through:…”

Section: B β-Function Measurements Based On Turn-by-turn Datamentioning

confidence: 99%

“…On the one hand, relative phase advances between a reference BPM and at least two other BPMs allow reconstructing the values of the β functions at the reference BPM under the assumption that there are no optics errors between the concerned BPMs. This method, known as β from phase (β ϕ ), was first used in LEP [20] and has been further developed in LHC, ALBA, and ESRF [21][22][23][24]. On the other hand, β can be also computed directly from the amplitude of the turn-by-turn spectra.…”

Section: Introductionmentioning

confidence: 99%

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Optics-measurement-based beam position monitor calibrations in the LHC insertion regions

Valdivieso

Tomás

2020

Phys. Rev. Accel. Beams

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Accurate measurements of optics functions, β, α, D, are essential for proper operation of a synchrotron both for machine protection and for performance. β functions can be obtained from different observables: phase and amplitude of the transverse betatron oscillations and change of the tune by modulating the current of quadrupoles (K-modulation). Reconstruction of β function using the betatron phase, in combination with K-modulation, has been the main measurement approach in the LHC IRs. Nonetheless, challenges have appeared in the β calculation using these two techniques when aiming for smaller β Ã , i.e., β-values at the interaction point (IP) in the LHC and the HL-LHC. The third β measurement technique, based on the beam position monitor (BPM) signal amplitude, has not been used as widely in the LHC as the other methods since it requires accurate BPM gain calibration. This paper presents the development of a technique based on optics measurements to calibrate accurately LHC IR BPMs, allowing to use of the amplitude information in the measurement of IR β functions.

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Section: B β-Function Measurements Based On Turn-by-turn Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optics-measurement-based beam position monitor calibrations in the LHC insertion regions

Valdivieso

Tomás

2020

Phys. Rev. Accel. Beams

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“…For the phase advanced based approach, the N-BPM method [23,24] is employed, using combinations of 7 surrounding BPMs to the one probed. This approach uses measured and model phase advances between BPMs together with the model β-functions at the BPMs to determine the β-function at a certain BPM.…”

Section: Linear Opticsmentioning

confidence: 99%

Nonlinear Optics Measurements in IOTA

Hofer

Valishev

García

et al. 2021

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Nonlinear integrable optics is a recently proposed accelerator lattice design approach which allows to generate an amplitude dependent tune shift which is needed in high brightness accelerators to mitigate fast coherent instabilities. Whereas usually octupoles are used to achieve this task, this concept allows doing so without exciting any resonances, in turn preventing any particle loss. The concept is based around a special magnet design, together with specific constraints on the optics of the accelerator. To study such a system, the Integrable Optics Test Accelerator (IOTA) was recently constructed and commissioned at Fermilab. For the assessment of the performance of this concept, good knowledge of the optics and the (non-)linear dynamics without the special magnet is of key importance. As such, measurements were conducted in the IOTA ring, using the captured turn-by-turn data by the beam position monitors after excitation to infer quantities such as amplitude detuning and resonance driving terms. In this note, first results of these measurements are presented.

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“…The amplitude of the betatron oscillations can be used to measure β functions but it requires a good control of the BPM calibration errors [22][23][24]. Instead the phase advances between three or more BPMs can be used to obtain β and α functions as described in [25][26][27].…”

Section: Betatron Oscillations Free or Forcedmentioning

confidence: 99%

Accelerator Operations

Lamont

Wenninger

Steinhagen

et al. 2020

Particle Physics Reference Library

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The cost of building a particle accelerator is a major capital investment. Commissioning should be swift and the subsequent exploitation of a facility must provide an effective return. This return may be difficult to quantify unambiguously but generally acceptable measures of performance can be established. These measures might include: machine availability; integrated luminosity; protons on target; beam hours to users and so on. The role of accelerator operations is to maximize the performance of an accelerator or accelerator complex by: minimizing downtime; maximizing the amount of beam delivered to the users; fully optimizing the quality of beam delivered to the users; and doing it all safely. Accelerators and the control of particles beams have advanced considerably over recent years. There is deep understanding of particle dynamics, innovative measurement techniques, in-depth simulation and modelling, and widespread leverage of Coordinated by M. Lamont.

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Analytical N beam position monitor method

Cited by 17 publications

References 11 publications

Optics-measurement-based beam position monitor calibrations in the LHC insertion regions

Optics-measurement-based beam position monitor calibrations in the LHC insertion regions

Nonlinear Optics Measurements in IOTA

Accelerator Operations

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