2'1 Magnet Design Studies Alexander Zlobin

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2.1 Magnet Design Studies Alexander Zlobin
Introduction FY2005 status FY2006 plan and
budget Summary
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Possible LHC IR designs
Single-aperture IR design
Double-aperture IR designs
New LHC IRs need high-field large-aperture
magnets (D and Q) with high operation margin and
long lifetime
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Scope of work

• LARP magnet RD includes the following basic
  directions
• technology development for Nb3Sn IR magnets
• IR magnet design studies
• Design Studies scope of work
• Model magnet design studies and analysis
• proposal generation or evaluation including
  magnet parameters, design concept, cost, schedule
• preparation of key decisions
• IR magnet conceptual design studies
• magnet parameter space, radiation dose and
  life-time, exotic magnet designs (double-aperture
  dipole and quadrupoles with parallel and
  non-parallel apertures), etc.

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FY2005 directions and tasks

• In FY2005 we identified three key directions and
  five tasks for LARP Magnet Design Studies
• 2.1 Design Studies
• 2.1.1 Quadrupole 
• 2.1.1.1 Shell Block design comparison
• 2.1.1.2 Shell mechanical design study
• 2.1.2 Separation dipole 
• 2.1.2.1 D1 design
• 2.1.2.2 D1 cooling study
• 2.1.3 Cryogenics 
• 2.1.3.1 IR cryogenics study
• Practically all tasks are based on participation
  of at least 2 Labs.
• Work coordination is performed through the
  personal communications, video and phone
  conferences and at collaboration meetings.

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FY2005 budget

• DS budget in FY2005 is lt10 of the total LARP
  Magnet RD budget
• Due to limited budget in FY2005 most of the DS
  work at FNAL and LBNL is supported by Labs core
  program funding

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Task 2.1.1.1 status

• Task Name IRQ design comparison shell-type vs.
  block-type
• Task leader P. Ferracin (LBNL)
• Participating laboratories FNAL, LBNL
• Task goals Investigate potential of racetrack
  quadrupoles for LHC luminosity upgrade, continue
  the comparison of racetrack-type and shell-type
  IR quadrupoles started in FY2004.  
• Current status The task is making good progress.
  The comparison strategy was developed including
  the beam envelope, magnetic, mechanical, thermal,
  radiation and quench protection requirements.
  Several IR quad designs were generated and
  compared with 90 mm shell-type quads including
  magnetic and mechanical parameters. Next steps
• radiation energy deposition analysis and its
  effect on magnet operation margin and life-time
  (thermal analysis, radiation dose)
• quench protection
• The task needs to be extended to FY06.

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Block-type IRQ coils and mechanical structure
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Task 2.1.1.2 status

• Task Name Possibilities and limits of IR
  shell-type quad mechanical designs based on
  Al-shell and collarsSS-skin
• Task leader G. Ambrosio (FNAL)
• Participating laboratories FNAL, LBNL
• Task goal Evaluation of advantages and
  limitations of different mechanical concepts for
  large aperture, high-gradient, shell-type
  quadrupoles
• Current status The following mechanical concept
  are being studied
• SS-collars and SS-skin,
• Al-shell and iron pads using bladder and keys,
• SS-collars and Al-shell using bladder and keys.
• Mechanical analysis is in progress revealing
  potential mechanical problems in 4-layer 110-mm
  IR quads.
• The analysis needs to be extended to smaller
  aperture magnets including 90-mm TQ models.

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Task 2.1.2.1 status

• Task Name D1 Dipole Design (open midplane)
• Task leader R. Gupta (BNL)
• Participating laboratories BNL, FNAL, LBNL
• Task goal Develop a magnet design that satisfies
  the requirements for the dipole first optics of
  LHC IR luminosity upgrade.
• Current status Conceptual designs of an open
  mid-plane dipole and its simplified POP model
  have been developed and reviewed. 2D magnetic and
  mechanical analysis has been performed.
  Alternative design approaches were also proposed.
  
• Although the work on D1 hardware was postponed,
  D1 design studies will continue in FY06 to
  support LHC IR design studies.

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Open midplane separation dipole (BNL)
Design/Quench/Peak Field 13.5 T/15 T/16 T, field
quality ???


Nominal horizontal coil spacing 120 mm
Nominal vertical coil spacing 40 mm
External absorber

Yoke OD 2 m

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Larger-aperture separation dipole (LBNL)
Shell-type coil design
Block-type coil design
200 mm horizontal aperture, thick internal
absorber Bmax15-16 T, good field quality 1.5-2 m
iron OD
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Task 2.1.2.2 status

• Task Name D1 dipole cooling study
• Task leader T. Peterson (FNAL)
• Participating laboratories FNAL, BNL
• Task goals To check the implications of large
  (100-200 W/m) heat loads on the internal passage
  sizes and magnet structure, and to check under
  what conditions, if at all, removing 1 KW or more
  from a 10 meter magnet is feasible.
• Current status The work on this task has been
  started. The details of open midplane D1
  mechanical structure and alternative D1 designs
  will be used.
• The duration of this task has to be extended.

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Task 2.1.3.1 status

• Task Name Conceptual design, parameters, and
  comparison of inner-triplet cryogenics at 1.9 K
  and 4.5 K.
• Task leader R. Rabehl (FNAL)
• Participating laboratories FNAL
• Task goal Investigate and compare 1.9 K and 4.5
  K inner triplet cryogenic systems and coil
  temperatures for both single-bore and double-bore
  IR triplet designs.
• Current status The work on this task is in
  progress. Figures of merit including DT from
  coils to feed box, required He II inventory, cold
  mass packing factor and compatibility with
  current cryostat diameter and feed boxes have
  been discussed.
• This task will be continued in FY06.

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FY2006 directions and tasks

• Major DS directions have been modified based on
  the recent changes in program priorities (focus
  on IR quadrupoles).
• Task reorganization was made to provide more
  flexibility to program needs and address
  important practical issues.
• 2.1.1 IR Magnets
• 2.1.1.1 Magnetic Design and Analysis
• 2.1.1.2 Mechanical Design and Analysis
• 2.1.1.3 Thermal Analysis
• 2.1.1.4 Quench Protection Analysis
• 2.1.1.5 Test Data Analysis
• 2.1.2 Cryogenics
• 2.1.2.1 Radiation Heat Deposition
• 2.1.2.2 IR Cryogenics and Heat Transfer
• 2.1.2.3 Cryostat Quench Protection

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DS Working group

• The DS working group in FY2006 will be reinforced
  including more experts from all three Labs
• BNL R. Gupta, J. Muratore, J. Schmalzle, K.C. Wu
• LBNL S. Caspi, P. Ferracin, A. Lietzke, G. Sabbi
• Fermilab G. Ambrosio, S. Feher, V. Kashikhin, N.
  Mokhov, I. Novitski, T. Peterson, R. Rabehl, A.
  Zlobin
• The DS team (the number of experts and their
  qualification) is sufficient to perform the
  planned work.

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2.1.1 IR Magnets FY2006 Tasks
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2.1.2 Cryogenics FY2006 Tasks
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2.1.1 IR Magnets schedule
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2.1.2 IR Cryogenics schedule
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FY2006 DS budget

• Total 400k (1.9 FTE)
• Task budget
• IR Magnets 290k
• IR Cryogenics 110k
• Lab budget
• BNL 90k (0.4 FTE)
• FNAL 190k (1.0 FTE)
• LBNL 120k (0.5 FTE)
• All three Labs agreed to provide support to LARP
  DS activities from their core magnet programs.

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Summary

• Design Studies are an important part of LARP
  Magnet RD.
• Major DS directions have been identified.
• Strong DS working group has been formed.
• A good progress is expected in FY2005 in spite of
  limited resources.
• FY2006-2007 DS work plan is focused on
• supporting model magnet RD, data analysis and
  preparation of critical decisions in FY2007
• Mechanical design and parameters of long
  quadropole (LQ)
• Conceptual design of ultimate gradient quadrupole
  (HQ)
• conceptual IR magnet design analysis in
  collaboration with AP group and CERN