Adaptive collimator design for future particle accelerators

Thomas Furness, Simon Fletcher, James Williamson, Alessandro Bertarelli, Federico Carra, Michele Pasquali, Luca Gentini, Stefano Redaelli

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The function of collimators in the Large Hadron Collider
(LHC) is to control and safely dispose of the halo particles
that are produced by unavoidable beam losses from the circulating
beam. Even tiny proportions of the 7TeV beam
have the stored energy to quench the superconducting magnets
or damage parts of the accelerator if left unchecked.
Particle absorbing Low-Z material makes up the active
area of the collimator (jaws). Various beam impact scenarios
can induce significant temperature gradients that cause
deformation of the jaws. This can lead to a reduction in
beam cleaning efficiency, which can have a detrimental effect
on beam dynamics. This has led to research into a new
Adaptive Collimation System (ACS). The ACS is a re-design
of a current collimator already in use at CERN, for use
in the HL-LHC. The ACS will incorporate a novel fibreoptic-based
measurement system and piezoceramic actuators
mounted within the body of the collimator to maintain
jaw straightness below the 100µm specification. These two
systems working in tandem can monitor, and correct for,
the jaw structural deformation for all impact events. This
paper details the concept and technical solutions of the
ACS as well as preliminary validation calculations.
LanguageEnglish
Title of host publication7th International Beam Instrumentation Conference
Subtitle of host publication2018 IBIC
Pages240-244
Number of pages5
Volume187
DOIs
Publication statusPublished - 29 Jan 2019
Event7th International Beam Instrumentation Conference - Shanghai Institute of Applied Physics, Shanghai, China
Duration: 9 Sep 201813 Sep 2018
Conference number: 7
http://ibic2018.vrws.de/ (Link to Conference Website)

Conference

Conference7th International Beam Instrumentation Conference
Abbreviated titleIBIC2018
CountryChina
CityShanghai
Period9/09/1813/09/18
Internet address

Fingerprint

particle accelerators
collimators
collimation
cleaning
specifications
halos
temperature gradients
proportion
accelerators
damage
energy

Cite this

Furness, T., Fletcher, S., Williamson, J., Bertarelli, A., Carra, F., Pasquali, M., ... Redaelli, S. (2019). Adaptive collimator design for future particle accelerators. In 7th International Beam Instrumentation Conference: 2018 IBIC (Vol. 187, pp. 240-244) https://doi.org/10.18429/JACoW-IBIC2018-TUPA15
Furness, Thomas ; Fletcher, Simon ; Williamson, James ; Bertarelli, Alessandro ; Carra, Federico ; Pasquali, Michele ; Gentini, Luca ; Redaelli, Stefano. / Adaptive collimator design for future particle accelerators. 7th International Beam Instrumentation Conference: 2018 IBIC. Vol. 187 2019. pp. 240-244
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title = "Adaptive collimator design for future particle accelerators",
abstract = "The function of collimators in the Large Hadron Collider(LHC) is to control and safely dispose of the halo particlesthat are produced by unavoidable beam losses from the circulatingbeam. Even tiny proportions of the 7TeV beamhave the stored energy to quench the superconducting magnetsor damage parts of the accelerator if left unchecked.Particle absorbing Low-Z material makes up the activearea of the collimator (jaws). Various beam impact scenarioscan induce significant temperature gradients that causedeformation of the jaws. This can lead to a reduction inbeam cleaning efficiency, which can have a detrimental effecton beam dynamics. This has led to research into a newAdaptive Collimation System (ACS). The ACS is a re-designof a current collimator already in use at CERN, for usein the HL-LHC. The ACS will incorporate a novel fibreoptic-basedmeasurement system and piezoceramic actuatorsmounted within the body of the collimator to maintainjaw straightness below the 100µm specification. These twosystems working in tandem can monitor, and correct for,the jaw structural deformation for all impact events. Thispaper details the concept and technical solutions of theACS as well as preliminary validation calculations.",
keywords = "collimation, LHC, machine protection",
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Furness, T, Fletcher, S, Williamson, J, Bertarelli, A, Carra, F, Pasquali, M, Gentini, L & Redaelli, S 2019, Adaptive collimator design for future particle accelerators. in 7th International Beam Instrumentation Conference: 2018 IBIC. vol. 187, pp. 240-244, 7th International Beam Instrumentation Conference, Shanghai, China, 9/09/18. https://doi.org/10.18429/JACoW-IBIC2018-TUPA15

Adaptive collimator design for future particle accelerators. / Furness, Thomas; Fletcher, Simon; Williamson, James; Bertarelli, Alessandro; Carra, Federico; Pasquali, Michele; Gentini, Luca; Redaelli, Stefano.

7th International Beam Instrumentation Conference: 2018 IBIC. Vol. 187 2019. p. 240-244.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AU - Gentini, Luca

AU - Redaelli, Stefano

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N2 - The function of collimators in the Large Hadron Collider(LHC) is to control and safely dispose of the halo particlesthat are produced by unavoidable beam losses from the circulatingbeam. Even tiny proportions of the 7TeV beamhave the stored energy to quench the superconducting magnetsor damage parts of the accelerator if left unchecked.Particle absorbing Low-Z material makes up the activearea of the collimator (jaws). Various beam impact scenarioscan induce significant temperature gradients that causedeformation of the jaws. This can lead to a reduction inbeam cleaning efficiency, which can have a detrimental effecton beam dynamics. This has led to research into a newAdaptive Collimation System (ACS). The ACS is a re-designof a current collimator already in use at CERN, for usein the HL-LHC. The ACS will incorporate a novel fibreoptic-basedmeasurement system and piezoceramic actuatorsmounted within the body of the collimator to maintainjaw straightness below the 100µm specification. These twosystems working in tandem can monitor, and correct for,the jaw structural deformation for all impact events. Thispaper details the concept and technical solutions of theACS as well as preliminary validation calculations.

AB - The function of collimators in the Large Hadron Collider(LHC) is to control and safely dispose of the halo particlesthat are produced by unavoidable beam losses from the circulatingbeam. Even tiny proportions of the 7TeV beamhave the stored energy to quench the superconducting magnetsor damage parts of the accelerator if left unchecked.Particle absorbing Low-Z material makes up the activearea of the collimator (jaws). Various beam impact scenarioscan induce significant temperature gradients that causedeformation of the jaws. This can lead to a reduction inbeam cleaning efficiency, which can have a detrimental effecton beam dynamics. This has led to research into a newAdaptive Collimation System (ACS). The ACS is a re-designof a current collimator already in use at CERN, for usein the HL-LHC. The ACS will incorporate a novel fibreoptic-basedmeasurement system and piezoceramic actuatorsmounted within the body of the collimator to maintainjaw straightness below the 100µm specification. These twosystems working in tandem can monitor, and correct for,the jaw structural deformation for all impact events. Thispaper details the concept and technical solutions of theACS as well as preliminary validation calculations.

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Furness T, Fletcher S, Williamson J, Bertarelli A, Carra F, Pasquali M et al. Adaptive collimator design for future particle accelerators. In 7th International Beam Instrumentation Conference: 2018 IBIC. Vol. 187. 2019. p. 240-244 https://doi.org/10.18429/JACoW-IBIC2018-TUPA15