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MERLIN for High Luminosity Large Hadron Collider Collimation

Rafique, Haroon (2017) MERLIN for High Luminosity Large Hadron Collider Collimation. Doctoral thesis, University of Huddersfield.

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Abstract

The large hadron collider (LHC) uses the most energetic and highest luminosity
man made proton beams on Earth. The high luminosity (HL-LHC)
[1] upgrade aims to increase the levelled luminosity of the LHC by a factor
of five, to 5 · 1034cm−2
s
−1
, by increasing the bunch population from 1 to
2.22·1011 protons, and decreasing emittance, and β

. Thus the stored beam
energy increases from ≈ 362 MJ to ≈ 675 MJ per beam.
All synchrotrons encounter unavoidable proton losses. Protons that populate
the beam halo pose a threat to the performance and lifetime of certain
hardware, such as superconducting magnets, which in the LHC may be
quenched by an impact of ≈ 1 · 106 protons [2]. A multi stage collimation
system must operate at an efficiency such that no more than 2 · 10−5% of
protons incident on collimators may escape and impact upon these magnets
[3].
To predict and protect against proton losses in the HL-LHC, collimation
simulations must be performed. MERLIN, a C++ accelerator physics library,
has been updated to carry out such simulations for the HL-LHC.
Novel materials such as molybdenum graphite have been investigated as
collimator materials, and a novel technique - collimation enhancement via
a hollow electron lens (HEL) - has been studied. Using detailed simulations
the performance and operation of possible collimation upgrades are
explored.

Item Type: Thesis (Doctoral)
Subjects: T Technology > T Technology (General)
Schools: School of Computing and Engineering
Depositing User: Sharon Beastall
Date Deposited: 10 Aug 2017 08:14
Last Modified: 12 Aug 2017 12:48
URI: http://eprints.hud.ac.uk/id/eprint/32605

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