Design Study Summary A. Zlobin

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Design Study SummaryA. Zlobin
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FY2006-2007 DS directions and tasks

• The FY2006 list of acting Design Study tasks
• 2.1 Design Studies
• 2.1.3 IR Cryogenics
• 2.1.3.2 Inner triplet cryo heat transfer Roger
  Rabehl (FNAL)
• 2.1.3.3 Radiation heat deposition Nikolai
  Mokhov (FNAL)
• 2.1.4 IR Magnets
• 2.1.4.1 HQ conceptual design GianLuca Sabbi
  (LBNL)
• 2.1.4.2 LQ conceptual design Giorgio Ambrosio
  (FNAL)
• 2.1.4.3 IR magnet study Peter Wanderer
  (BNL)
• The goal of the discussion was
• DS task plan and results in FY06 and plan for
  FY07

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FY2006-2007 Goals

• Model magnet conceptual design studies and
  analysis
• generation or evaluation of model magnet
  proposals including magnet parameters, design
  concept, cost, schedule for LQ and HQ
• IR magnet conceptual design studies
• magnet parameter space, IR magnet design studies,
  error tables
• Cryogenics and heat transfer
• radiation heat depositions and dynamic heat load,
  dose and life-time, heat transfer, cryostat
  quench protection
• Interface with LARP AP group

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FY2006 DS Task budget

• The original FY2006 DS Task budget and its
  distribution among the participating Labs are
  presented in Table (numbers in black color).
• The DS task budget changes are shown in the above
  table in red color.
• The DS budget was increased to 416k or by 10.

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2.1.4.1 HQ conceptual design - G. Sabbi
Goal Develop HQ design (90 mm bore, Ggt250 T/m,
Bmax15 T) and RD plan in preparation for model
fabrication - Magnetic, mechanical and quench
analysis - RD issues, magnet parameters and
features Conductor - strand (optimal design,
critical current at high field) - cable (limits
on maximum width keystone angle) Magnetic -
number of layers (cable design, winding
issues) - use of wedges, conductor grading, end
field optimization - Lorentz stresses Mechanical
- collar-based vs. shell-based structure -
structure and coil alignment - end axial
support Integration - coordination with model
magnet, supporting RD - coordination with IR
magnets study - fabrication, cost and schedule
considerations - target parameters, design
features, RD plan
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Milestones
FY06 Focus on coil
FY07 Focus on structure
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Summary

• 2-, 3- and 4-layer coil analysis
• Two reference coil cross-sections were selected
• Preliminary yoke analysis
• Yoke OD 250 mm
• Coil-yoke distance 10 mm
• Preliminary coil mechanical analysis Pmax170 MPa

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2.1.4.2 LQ conceptual design - G. Ambrosio

• GOAL design study of Long Quadrupole 4 m long,
  90 mm aperture, G gt 200 T/m,
• TQs design is the baseline
• RD issues
• Strand and cable
• Define strand and cable characteristics
• Coil fabrication technology
• Define all steps of coil fabrication (procedures
  and materials)
• Magnetic design
• Develop modifications to TQ magnetic design if
  necessary
• Mechanical design
• Understand mechanical behavior and impact on
  performance of TQ
• Analysis and integration
• Analyze and compare supporting structures for LQ
  mechanical design
• Quench protection
• Propose quench protection scheme

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Status and plans
? Q4
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2.1.4.3 IR magnet study - P. Wanderer

• FY2006 Milestones (sub-tasks)
• 1 Analysis and comparison of IRQ based on
  shell-type and block-type coils Q1
• 2 Analysis of a 110-mm shell-type IRquad with
  different supporting structures Q2
• 3 Analysis of aperture and field quality
  limitations for double-bore IR Quads Q3
• 4 Field quality analysis and error tables for
  Nb3Sn IRQ Q4
• FY2007 Milestones (sub-tasks) TBD

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1 Compare block, shell quads

• Status For a reasonable set of IR quad
  requirements, a block quad was developed. The
  mechanical and magnetic properties of this quad
  and a shell quad which met the same requirements
  have been compared.
• Next Study response of these quads to IR
  radiation, iterate designs.

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2 Study of different support structures in quads

• Objctives
• 110 mm aperture, shell-type, 228 T/m.
• Generic structures for high forces
• Not specific to a particular coil
• Status
• Two types of coil arrangements
• 4-layers, all glued together (complete)
• 4-layers, glued together in pairs (now starting)

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3 Study double-bore quads

• Objective Quads for dipole-first optics
• Status
• Two cases warm and cold iron
• 100 mm aperture,
• 205 T/m operation field gradient
• 194 mm beam separation
• Determine dynamic aperture (10-4 FQ)
• Achieving good FQ a challenge
• Correctors LHC baseline
• MQXB beam envelope (2x9?) 40 mm
• MQXB FQ (measured) at 40 mm 10-4
• 2-in-1 quads 10-4 region 54 mm
• LARP beam envelope (1.1x18?) 70(60) mm
• LARP beam envelope (18?) 64(54) mm

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2.1.3.3 Radiation heat deposition - I. Rakhno

• Goal Monte Carlo studies to calculate radiation
  heat depositions for the interaction region
  magnets in various inner triplet configurations.
• FY2006 milestones
• Calculate radial and azimuthal radiation heat
  deposition powers for IR quadrupoles
• as a function of internal absorber thickness (Q1)
• as a function of midplane spacer size (Q2)
• Calculate radiation heat deposition power for
  interaction region separation dipoles vs.
  internal absorber thickness (Q3).
• Calculate longitudinal distribution of radiation
  heat deposition power for the quadrupole-first
  inner triplet configuration. (Q4)
• FY2007 milestones TBD

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Work status
Wmax and dynamic heat load for the LHC inner
triplet with Nb3Sn quadrupoles of various
diameters are provided. Several liner
thicknesses are considered. StSt and W-25 Re
liners are considered. StSt liner of increased
thickness (baseline5mm) does not provide an
adequate protection for the 100-mm coils (Wmax
gt1.7 mW/g). An alternative way to reduce emax in
superconducting coils spacers (aluminum and
graphite) does not look very promising. W-25
Re liner of increased thickness (baseline 2 mm)
provides an adequate protection for the 100-mm
coils (Wmax 1.2 mW/g) .
StSt liner vs W25 Re linerPeak energy deposition
in inner coil
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2.1.3.2 Inner triplet cryo heat transfer - K.C.
Wu

• Task goal investigate and compare 2K inner
  triplet cryogenic systems and coil temperatures
  for single-bore quadrupole-first designs,
  investigate IR quadrupole cryostat quench
  protection issues related to stored energy, pipe
  sizes, and material thicknesses.
• FY2006 milestones
• Establish and document a design temperature
  profile (Q1)
• Parametric studies of heat transfer in IR
  quadrupoles (Q2)
• Parametric studies of quadrupole-first IR cryo
  system (Q3)
• Quadrupole cryostat quench protection studies
  (Q3)
• IR triplet cryostat quench protection studies
  (Q4)
• FY2007 milestones
• Triplet quench protection studies.
• Heat exchanger and internal absorber design
  studies.
• Proposal for HX/absorber experimental work
• Heat transfer parametric studies of 4 K systems.
• .Heat transfer parametric studies of other 2 K
  systems, such as double-bore or dipole-first.

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Status of IR Cryo Studies

• Comparison of current and upgraded Q1-Q2a
  interconnects.

Typical results of cold mass parametric study (Q1
non-IP end).
HX conceptual design is a shell and tube heat
exchanger (pressurized He II in tubes) and a
separate pumping line.