Multipole compensation scheme for LHC low-β insertions

Faus‐Golfe, A.; Verdier, A.

doi:10.1063/1.52948

Cited by 10 publications

(12 citation statements)

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“…Each BPM is mounted on movers (Fig. 5) [12] that permit independent translation along the x and y axes; this allows convenient centering of the beam inside each BPM aperture. The range of motion in both axes is AE1.5 mm and the minimum step size is 1 μm.…”

Section: Stripline Bpmsmentioning

confidence: 99%

Design and performance of a high resolution, low latency stripline beam position monitor system

Apsimon

Bett

Kraljevic

et al. 2015

Phys. Rev. ST Accel. Beams

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A high-resolution, low-latency beam position monitor (BPM) system has been developed for use in particle accelerators and beam lines that operate with trains of particle bunches with bunch separations as low as several tens of nanoseconds, such as future linear electron-positron colliders and free-electron lasers. The system was tested with electron beams in the extraction line of the Accelerator Test Facility at the High Energy Accelerator Research Organization (KEK) in Japan. It consists of three stripline BPMs instrumented with analogue signal-processing electronics and a custom digitizer for logging the data. The design of the analogue processor units is presented in detail, along with measurements of the system performance. The processor latency is 15.6 AE 0.1 ns. A single-pass beam position resolution of 291 AE 10 nm has been achieved, using a beam with a bunch charge of approximately 1 nC.

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Section: Stripline Bpmsmentioning

confidence: 99%

Design and performance of a high resolution, low latency stripline beam position monitor system

Apsimon

Bett

Kraljevic

et al. 2015

Phys. Rev. ST Accel. Beams

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“…The beam-beam effect was disregarded. With the first estimates of the multipole field errors in the low-triplet, 6D tracking [11] shows clearly that the D.A. is only limited by the triplet errors and more precisely by a large b 10 component which will be reduced by design.…”

Section: Da At Collision Energymentioning

confidence: 99%

Overview of the LHC dynamic aperture studies

Böge

Faus‐Golfe²,

Gareyte³

et al.

Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)

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Boege, M. ; Faus-Golfe, A. ; Gareyte, J.; Grote, H. ; Koutchouk, J.-P. ;Miles, J. ; Qing, Q. ; Risselada, T. ; Schmidt, F. ; Weisz, S.The dynamic aperture (D.A.) of the LHC is estimated by tracking a thin-lens model of the lattice over a real machine time of 9 seconds. This raw result is then processed to predict the D.A. over longer times and realistic conditions. We discuss the reliability and limits of the method, the phenomena limiting the D.A. and scaling laws used for fast estimates. The long-term dynamic aperture at injection is close to the requirements, with prospects of further improvements.Presented AbstractThe dynamic aperture (D.A.) of the LHC is estimated by tracking a thin-lens model of the lattice over a real machine time of 9 seconds. This raw result is then processed to predict the D.A. over longer times and realistic conditions. We discuss the reliability and limits of the method, the phenomena limiting the D.A. and scaling laws used for fast estimates. The long-term dynamic aperture at injection is close to the requirements, with prospects of further improvements.

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“…This requires to break the exact antisymmetry. A second motivation arises from the requirements of robustness and flexibility: the dispersion function cannot be antisymmetric in a plane ring; its suppression by an antisymmetric scheme caused optical distortions and a lack of robustness [2]. In the new version 5 of the LHC optics, the antisymmetry, although underlying, is not imposed, opening a larger parameter space and requiring new methods.…”

Section: Introductionmentioning

confidence: 99%

A more robust and flexible lattice for LHC

Faus‐Golfe

Grote²,

Koutchouk³

et al.

Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)

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Faus-Golfe, A.; Grote, H. ; Koutchouk, J.-P. ; Risselada, T. ; Verdier, A ; Weisz, S.To correct more efficiently the arc dispersion, the exact antisymmetry of the LHC optics is now broken, except in the low-β triplets common to the two rings. A new quadrupole is added between the experimental insertions and the dispersion suppressors and several arc quadrupoles are complemented by a small trim quadrupole. The larger number of parameters gives flexibility to the lattice and allows a partial separation of the optical functions, with a decrease of the total number of quadrupole units. It is possible to change rather freely the phase advances of the arc cells. The nominal tunes are split by 4 units to reduce coupling. The β* tuning range in the experimental low-β is significantly increased, allowing e.g. a larger beam separation at injection. The super-periodicity of LHC remains 1. We plan to study whether it can be increased within the LHC hardware constraints AbstractTo correct more efficiently the arc dispersion , the exact antisymmetry of the LHC optics is now broken, except in the low-triplets common to the two rings. A new quadrupole is added between the experimental insertions and the dispersion suppressors and several arc quadrupoles are complemented by a small trim quadrupole. The larger number of parameters gives flexibility to the lattice and allows a partial separation of the optical functions, with a decrease of the total number of quadrupole units. It is possible to change rather freely the phase advances of the arc cells. The nominal tunes are split by 4 units to reduce coupling.The tuning range in the experimental low-is significantly increased, allowing e.g. a larger beam separation at injection. The super-periodicity of LHC remains 1. We plan to study whether it can be increased within the LHC hardware constraints.

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Multipole compensation scheme for LHC low-β insertions

Cited by 10 publications

References 0 publications

Design and performance of a high resolution, low latency stripline beam position monitor system

Design and performance of a high resolution, low latency stripline beam position monitor system

Overview of the LHC dynamic aperture studies

A more robust and flexible lattice for LHC

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