Beam feasibility study of a collimator with in-jaw beam position monitors

Wollmann, Daniel; Nosych, Andriy; Valentino, Gianluca; Aberle, O.; Aßmann, Ralph; Bertarelli, A.; Boccard, C; Bruce, Roderik; Burkart, Florian; Calvo, Eva María; Cauchi, Marija; Dallocchio, Alessandro; Deboy, D; Gąsior, M.; Jones, R.; Kain, V.; Lari, L.; Redaelli, Stefano; Rossi, Adriana

doi:10.1016/j.nima.2014.09.024

Cited by 14 publications

(15 citation statements)

References 4 publications

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“…(12). There is a very good agreement between the simulated and measured BPM characteristics, shown in Figs.…”

Section: Coefficientsupporting

confidence: 65%

“…The jaws were moved in steps of ΔJ, which include a subset of identical simulated beam steps of ΔX within AEG=2. The scan technique is similar to that performed in the initial feasibility studies [12], except that the automation allows a larger gap range and step resolution to be explored.…”

Section: E Measuring Bpm Nonlinearitiesmentioning

confidence: 99%

“…2) was installed in the CERN Super Proton Synchrotron (SPS) in January 2010, oriented for beam cleaning in a horizontal plane. A number of beam feasibility tests were performed in 2010-2011, including verification of the alignment accuracy [12,13]. The successful results from the beam tests motivated the replacement of all 16 TCTs located in the experimental IRs (eight horizontal and eight vertical) and the two TCSGs in IR6 (both horizontal) with new collimators having embedded BPM buttons for LHC operation in 2015.…”

Section: Introductionmentioning

confidence: 99%

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Successive approximation algorithm for beam-position-monitor-based LHC collimator alignment

Valentino

Nosych

Bruce

et al. 2014

Phys. Rev. ST Accel. Beams

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Collimators with embedded beam position monitor (BPM) button electrodes will be installed in the Large Hadron Collider (LHC) during the current long shutdown period. For the subsequent operation, BPMs will allow the collimator jaws to be kept centered around the beam orbit. In this manner, a better beam cleaning efficiency and machine protection can be provided at unprecedented higher beam energies and intensities. A collimator alignment algorithm is proposed to center the jaws automatically around the beam. The algorithm is based on successive approximation and takes into account a correction of the nonlinear BPM sensitivity to beam displacement and an asymmetry of the electronic channels processing the BPM electrode signals. A software implementation was tested with a prototype collimator in the Super Proton Synchrotron. This paper presents results of the tests along with some considerations for eventual operation in the LHC.

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“…(12). There is a very good agreement between the simulated and measured BPM characteristics, shown in Figs.…”

Section: Coefficientsupporting

confidence: 65%

Section: E Measuring Bpm Nonlinearitiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Successive approximation algorithm for beam-position-monitor-based LHC collimator alignment

Valentino

Nosych

Bruce

et al. 2014

Phys. Rev. ST Accel. Beams

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“…During the shutdown, the TCTs and the IR6 TCSGs were upgraded with integrated BPMs [34,[73][74][75]. A newly developed temperature-insensitive electronics allows us to determine if parts of the observed drifts in Run I were an artifact caused by the temperature dependence of the present BPMs.…”

Section: Outlook For Run IImentioning

confidence: 99%

Calculations of safe collimator settings andβ*at the CERN Large Hadron Collider

Bruce

Assmann

Redaelli

2015

Phys. Rev. ST Accel. Beams

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The first run of the Large Hadron Collider (LHC) at CERN was very successful and resulted in important physics discoveries. One way of increasing the luminosity in a collider, which gave a very significant contribution to the LHC performance in the first run and can be used even if the beam intensity cannot be increased, is to decrease the transverse beam size at the interaction points by reducing the optical function β Ã . However, when doing so, the beam becomes larger in the final focusing system, which could expose its aperture to beam losses. For the LHC, which is designed to store beams with a total energy of 362 MJ, this is critical, since the loss of even a small fraction of the beam could cause a magnet quench or even damage. Therefore, the machine aperture has to be protected by the collimation system. The settings of the collimators constrain the maximum beam size that can be tolerated and therefore impose a lower limit on β Ã . In this paper, we present calculations to determine safe collimator settings and the resulting limit on β Ã , based on available aperture and operational stability of the machine. Our model was used to determine the LHC configurations in 2011 and 2012 and it was found that β Ã could be decreased significantly compared to the conservative model used in 2010. The gain in luminosity resulting from the decreased margins between collimators was more than a factor 2, and a further contribution from the use of realistic aperture estimates based on measurements was almost as large. This has played an essential role in the rapid and successful accumulation of experimental data in the LHC.

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“…The BPM-embedded design is considered as the baseline for future collimation upgrades. The concept has been tested extensively at the CERN SPS with a collimator prototype with BPMs [24,25,26]. Based on these results, 18 new collimators with integrated BPMs will already be installed during LS1, replacing the present tertiary collimators in all experiments (critical for *  reach) and the secondary collimators in the dump region.…”

Section: Collimator With Embedded Beam Position Monitorsmentioning

confidence: 99%

Cleaning Insertions and Collimation Challenges

Redaelli¹,

Losito²,

Lechner³

et al. 2015

The High Luminosity Large Hadron Collider

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High-performance collimation systems are essential for operating efficiently modern hadron machine with large beam intensities. In particular, at the LHC the collimation system ensures a clean disposal of beam halos in the superconducting environment. The challenges of the HL-LHC study pose various demanding requests for beam collimation. In this paper we review the present collimation system and its performance during the LHC Run 1 in 2010-2013. Various collimation solutions under study to address the HL-LHC requirements are then reviewed, identifying the main upgrade baseline and pointing out advanced collimation concept for further enhancement of the performance. Present LHC CollimationIn this introductory section the present LHC collimation system is reviewed. Its main features are presented and the highlight performance achievements during the LHC Run 1 are recalled. The possible limitations and challenges for the collimation in the HL-LHC era are then discussed. Introduction to LHC multi-stage collimationThe LHC collimation system is designed to safely dispose of beam losses in order to reduce the risk of quenches of superconducting magnets and damage of accelerator components. The cleaning functionality is required in case of unavoidable transverse betatron -as well as off-momentum losses. For this purpose, two dedicated warm LHC insertions address betatron (IR7) and momentum (IR3) cleaning separately [1]. A very efficient halo cleaning, as required to operate with unprecedented stored beam energies in a superconducting collider, is achieved through a multi-stage cleaning. This is illustrated

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Beam feasibility study of a collimator with in-jaw beam position monitors

Cited by 14 publications

References 4 publications

Successive approximation algorithm for beam-position-monitor-based LHC collimator alignment

Successive approximation algorithm for beam-position-monitor-based LHC collimator alignment

Calculations of safe collimator settings andβ*at the CERN Large Hadron Collider

Cleaning Insertions and Collimation Challenges

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