Influence of atomic screening on fragmentation of ultrarelativistic lead ions in LHC collimators

Jan C. Baggesen; Allan H. Sørensen

doi:10.1016/j.nimb.2009.05.056

Influence of atomic screening on fragmentation of ultrarelativistic lead ions in LHC collimators

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

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Abstract

When a lead beam is collimated in the CERN LHC some of the ions fragment in the collimators causing problems downstream. For design purposes the fragmentation probability needs to be assessed. At LHC energies (γ similar, equals

3000; the Lorentz-factor γ is the total energy of an ion in units of its rest energy) electromagnetic dissociation dominates the fragmentation in medium to heavy target materials. Due to the extended range of the interaction at high energies, atomic screening affects the dissociation in the LHC collimators. We determine the magnitude of the reduction in cross section relative to the unscreened case for various collimator materials and find a significant effect for tungsten, the heaviest candidate planned for use.

Original language	English
Journal	Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Volume	267
Issue	16
Pages (from-to)	2662–2666
ISSN	0168-583X
DOIs	https://doi.org/10.1016/j.nimb.2009.05.056
Publication status	Published - 15 Aug 2009

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10.1016/j.nimb.2009.05.056

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title = "Influence of atomic screening on fragmentation of ultrarelativistic lead ions in LHC collimators",

abstract = "When a lead beam is collimated in the CERN LHC some of the ions fragment in the collimators causing problems downstream. For design purposes the fragmentation probability needs to be assessed. At LHC energies (γ3000; the Lorentz-factor γ is the total energy of an ion in units of its rest energy) electromagnetic dissociation dominates the fragmentation in medium to heavy target materials. Due to the extended range of the interaction at high energies, atomic screening affects the dissociation in the LHC collimators. We determine the magnitude of the reduction in cross section relative to the unscreened case for various collimator materials and find a significant effect for tungsten, the heaviest candidate planned for use.",

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Influence of atomic screening on fragmentation of ultrarelativistic lead ions in LHC collimators. / Baggesen, Jan C.; Sørensen, Allan H.
In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 267, No. 16, 15.08.2009, p. 2662–2666.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

TY - JOUR

T1 - Influence of atomic screening on fragmentation of ultrarelativistic lead ions in LHC collimators

AU - Baggesen, Jan C.

AU - Sørensen, Allan H.

PY - 2009/8/15

Y1 - 2009/8/15

N2 - When a lead beam is collimated in the CERN LHC some of the ions fragment in the collimators causing problems downstream. For design purposes the fragmentation probability needs to be assessed. At LHC energies (γ3000; the Lorentz-factor γ is the total energy of an ion in units of its rest energy) electromagnetic dissociation dominates the fragmentation in medium to heavy target materials. Due to the extended range of the interaction at high energies, atomic screening affects the dissociation in the LHC collimators. We determine the magnitude of the reduction in cross section relative to the unscreened case for various collimator materials and find a significant effect for tungsten, the heaviest candidate planned for use.

AB - When a lead beam is collimated in the CERN LHC some of the ions fragment in the collimators causing problems downstream. For design purposes the fragmentation probability needs to be assessed. At LHC energies (γ3000; the Lorentz-factor γ is the total energy of an ion in units of its rest energy) electromagnetic dissociation dominates the fragmentation in medium to heavy target materials. Due to the extended range of the interaction at high energies, atomic screening affects the dissociation in the LHC collimators. We determine the magnitude of the reduction in cross section relative to the unscreened case for various collimator materials and find a significant effect for tungsten, the heaviest candidate planned for use.

U2 - 10.1016/j.nimb.2009.05.056

DO - 10.1016/j.nimb.2009.05.056

M3 - Journal article

SN - 0168-583X

VL - 267

SP - 2662

EP - 2666

JO - Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

JF - Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

IS - 16

ER -

Influence of atomic screening on fragmentation of ultrarelativistic lead ions in LHC collimators

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