Joint IR Studies: Operating Margins Nikolai Mokhov Fermilab

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Joint IR Studies Operating MarginsNikolai
MokhovFermilab
US LHC Accelerator Research Program
bnl - fnal- lbnl - slac
LARP Collaboration Meeting SLAC October 17-19,
2007
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Operating Margins Sub-Tasks

• Sub-task 1 (with BNL and CERN). Estimate the
  operational performance margins for QA magnets
  installed in the LHC. Develop requirements for QA
  temperature margin studies in bench tests.
• Sub-task 2 (with JJ and CERN). Perform parametric
  studies of radiation dose and heat deposition in
  potential QB candidates (and other components),
  as a function of aperture, optics, layout and
  distance from IP, in a full upgrade scenario.
  Explore means to reduce the level of radiation
  and heat deposition in magnet coils using radial
  and longitudinal absorbers to the level
  consistent with magnet operation margin and
  lifetime requirements.
• Sub-task 3 (with BNL, CERN, ATLAS and CMS teams).
  Study radiation dose, dynamic and static heat
  deposition in slim IR dipoles and quadrupoles
  inside the LHC detectors. Evaluate operational
  margin and magnet life-time for slim magnets
  based on NbTi, Nb3Sn or HTS technologies.

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QA Quadrupole Mission Statement FY08 FY09

• Define and evaluate a short list of potential QA
  locations at CERN, based on clearly established
  criteria, in full communication with LARPs
  primary liaisons at CERN (L. Rossi and H.
  Schmickler) and others. These locations may
  include (but are not limited to) LHC Q1 or Q3 in
  a potential early hybrid upgrade, and
  quadrupoles vulnerable to accidental radiation in
  the collimation region.
• Develop appropriately strict or relaxed
  specifications for the magnetic and
  accelerator-quality parameters of QA magnets
  alignment, field quality, persistent current
  fluctuations, snap-back, power supply regulation
  et cetera based on at least one of the
  potential locations.
• Examine the possibility of using LQ or HQ-derived
  designs and tooling to build QA magnets.
• Identify bench tests on QA or LQ or HQ magnets
  that would help explore and demonstrate
  accelerator quality performance (except
  radiation), to be performed within LARP Magnet
  Systems or at CERN.

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Operating Margins Sub-task 1 FY08

• Based on realistic energy deposition
  calculations, estimate the operational
  performance margins for Nb3Sn quadrupoles QA
  installed in the LHC and develop requirements for
  QA temperature margin studies in bench tests.
• This study will include
• Building realistic model of a QA quadrupole for
  the MARS Monte Carlo code with detailed 3-D
  geometry and materials description and
  OPERA-calculated 2-D magnetic field map.
• Building a corresponding thermal model of QA.
• Energy deposition calculations and thermal
  analysis of performance of QA being a part of the
  LHC inner triplet.
• Estimate the operational performance margins for
  QA.
• Define and evaluate a list of potential locations
  of QA at the LHC (e.g., Q1 or Q3 in an early
  hybrid upgrade) or elsewhere at CERN or
  Fermilab, in circulating beam or in a beam line
  -gt a dedicated irradiation test!
• The above, in full communication with the LARP
  primary liaisons at CERN and iterations with the
  Optics Layout Task group.

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Sub-task 1 FY08

• Deliverables
• - Report on energy deposition and thermal
  studies of QA quadrupoles in the LHC and
  operational performance margins for QA
  quadrupoles QA in the LHC and requirements for
  beam bench tests.
• Personnel
• FNAL N. Mokhov, V.V. Kashikhin, I. Rakhno, A.
  Zlobin
• CERN Contacts J.P. Koutchouk, L. Rossi, E.
  Wildner

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Slim Magnets

• Mission Statement
• List and evaluate sample straw man parameters
  (aperture, length, OD, field/gradient, field
  quality, alignment, etc.) and operation
  conditions (radiation deposition, forces and
  fields from detector magnet, dynamic and static
  heat load, etc.) for slim magnets located inside
  ATLAS and/or CMS.
• 2. Evaluate the usefulness of conventional NbTi
  technology, or of alternative magnet technologies
  (Nb3Sn or HTS) in terms of operational margin,
  magnet life-time, et cetera.

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Slim Magnets Operat. Margins FY08

• Within a fruitful collaboration between JPK and
  NM groups
• Complete FLUKA/MARS benchmarking and sensitivity
  analysis studies for the LHC IRs.
• Agree on a slim magnet parameters and
  configuration of its implementation into a
  detector and IR layout.
• Initiate detailed energy deposition simulations
  for the configuration agreed.