CLAS12 Superconducting Magnets R

1
CLAS12 Superconducting MagnetsRD and PED Plans

Latifa Elouadrhiri
Conceptual Design and Safety Review of
Superconducting Magnets Jefferson Lab September
26-28, 2006
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Outline

• Summary of RD/ACD FY06
• Project plans for FY07 and FY08
• PED plans for CLAS12 Superconducting Magnets
• Torus
• Solenoid
• Milestones
• Summary

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FY06 RD - SSC Cable Tests

• We tested 12 samples of SSC outer cable at BNL
• Cables were tested under conditions close to
  those expected for our magnets
• B-Fields 6T, 7T, and 8T
• Current 0 lt I lt 11,000 Amps
• Tests were performed at 4.2 K
• Results compare favorably to nominal short sample
  curve from L. Dresner

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SSC Cable Measurements at 4.2 K
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CLAS12 Torus Solenoid Peak Field Load Line
and SSC Cable Measurements
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CLAS12 Torus Solenoid Temperature Margins
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CLAS12 Torus and Solenoid Margins on the Load
Line
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TORUS Magnet - Conductor
CLAS12
1.1 mm
Mid-thickness1.156 mm
(De-Keystoned )
Keystone Angle1.01
11.68 mm
11.68 mm

• The SSC cable will be rolled to provide a
  rectangular cross section. The rolling will
  reduce both critical current and n index.
• Make the cable more suitable for intended use in
  the TORUS laminar winding technique.
• Expected to improve the conductor stability.
• Exact values will be determined in a tests
  program planned with the re-rolled SSC cable.

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ACD FY06 Tasks for CLAS12 Torus Magnet

• Optimization of conductor design, operating
  current.
• Optimization of cold mass coil package
• Adiabatic quench analysis, and protective
  measures
• Reference magnetic field map
• Magnetic force analysis for symmetric forces,
  force containment
• Preliminary design of coil case, coil clamping,
  and coil cooling
• FEA of coil case coil clamping
• Evaluation of asymmetric forces and force
  containment
• Preliminary design of radial force support
• Preliminary design of OOP support
• Preliminary design of coil cryostat
• Preliminary design of cryogenics schematics
• Evaluation of heat leak budget
• Magnet Safety System
• ACAD drawings of preliminary design
• Detailed evaluation of cost and construction
  schedule

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ACD Tasks for CLAS12 Torus Magnet

• Optimization of conductor design, operating
  current (address in FY07 RD).
• Optimization of cold mass coil package
• Adiabatic quench analysis, and protective
  measures
• Reference magnetic field map (to be redone due to
  change in coil shape.)
• Magnetic force analysis for symmetric forces,
  force containment
• Preliminary design of coil case, coil clamping,
  and coil cooling
• FEA of coil case coil clamping
• Evaluation of asymmetric forces and force
  containment
• Preliminary design of radial force support
• Preliminary design of OOP support
• Preliminary design of coil cryostat
• Preliminary design of cryogenics schematics
• Evaluation of heat leak budget
• Magnet Safety System
• ACAD drawings of preliminary design
• Detailed evaluation of cost and construction
  schedule

green completed, black in progress
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ACD FY06 - Solenoid Magnet

• Develop advanced conceptual design for solenoid
  magnet
• Optimization of conductor design and operating
  current
• Optimization and minimization of cold mass coil
  package
• Optimization of the main coil and the shielding
  coil
• Preliminary magnetic force analysis and force
  containment measures
• Preliminary design of radial force support
• Preliminary design of coil cryostat
• Preliminary design of cryogenics schematics
• Evaluation of heat leak budget
• Preliminary design drawings in ACAD
• Evaluation of cost and construction schedule
• Adiabatic quench analysis
• Preliminary design and FEA analysis of coil case,
  coil cooling, and coil clamping

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ACD - Solenoid Magnet

• Develop advanced conceptual design for solenoid
  magnet
• Optimization of conductor design and operating
  current
• Optimization and minimization of cold mass coil
  package
• Optimization of the main coil and the shielding
  coil
• Preliminary magnetic force analysis and force
  containment measures
• Preliminary design of radial force support
• Preliminary design of coil cryostat
• Preliminary design of cryogenics schematics
• Evaluation of heat leak budget
• Preliminary design drawings in ACAD
• Evaluation of cost and construction schedule
• Adiabatic quench analysis
• Preliminary design and FEA analysis of coil case,
  coil cooling, and coil clamping

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Solenoid Field Map
CLAS12
Field variation DB/B in center
Magnetic field in quadrant (Tesla)

• Magnetic field distribution

4.5
4.0

• With proper shaping of the coils excellent field
  homogeneity of ?B/B lt 10-4 is obtained in
  cylinder of 10 cm length x 3 cm diameter.
• Allows operation of dynamically polarized target
  with significant margin.

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CLAS12
Solenoid Optimization of shielding coil
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CLAS12 - Magnet Milestones

• Main focus is the completion of all RD and PED
  tasks that are required to support the
  preparation of
• Project baseline in 4Q FY07
• Define and verify main performance parameters.
• Develop project engineering and design for all
  components to a level sufficient for detailed
  cost estimates and construction schedule,
  including the verification of proper
  implementation of safety aspects in the design.
• Project construction in 4Q FY08
• Complete the reference design for CLAS12 Magnets,
  including emphasis on operational safety
  procedures.

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PED FY07/FY08 - Torus Magnet

• The CLAS12 physics program requires magnetic
  analysis of charged particles in the polar angle
  range of 5o 40o and covering most of the
  azimuthal angle range. This is achieved by a
  superconducting toroidal magnet with symmetric
  six coil geometry.
• Develop magnet concepts to allow decision between
  the two design options design
• Develop the reference design for the Torus magnet
  
• Optimize transverse size of the coil
• Validate concept with forward cold support hub
• Generate detailed design drawings
• Incorporate safety aspects in the magnet design
• Provide detailed cost estimate and construction
  schedule

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PED FY07 - Solenoid Magnet

• The CLAS12 physics program requires magnetic
  analysis of charged particles in the polar angle
  range of 40o 135o and covering the entire
  azimuthal angle range. In addition, operation of
  a polarized target is required in a highly
  uniform magnetic field of up to 5 Tesla.
• Develop reference design of Solenoid Magnet
• Validate concept with compensation coil, and
  address in detailed analysis operation of
  polarized target, magnetic forces, quench
  protection, minimization of cold mass
• Generate detailed design drawings
• Detailed field maps for main coil and shielding
  coil
• Incorporate safety aspects in the magnet design
• Evaluate detailed cost and construction schedule
  

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PED Tasks for CLAS12 Magnets

• The Reference Design includes detailed
  calculations and design drawings of
• conductor and operating current
• cold mass coil package
• magnetic field map
• magnetic force analysis and force containment
• radial force support
• coil cryostat
• cryogenics schematics and Interface with Hall-B
• heat leak budget and cool down calculation
• cost and construction schedule
• 3D spatial and time quench analysis
• design of coil case, coil cooling, and coil
  clamping
• FEA analysis of coil case coil clamping
• step by step manufacturing process analysis
• manufacturing process testing and quality control
  plan
• cryogenic cooling scheme for all modes of
  operation

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Summary

• Advance Conceptual Design of the CLAS12 Magnets
• Significant progress has been made to
  advance the conceptual design of the CLAS12 Torus
  Magnet and the Solenoid Magnet, this work
  resulted in very significant progress towards
  the reference design.
• Torus magnet two design options
• design approach based on the IKT technology
• design based on conventional technology similar
  to CLAS Torus
• Solenoid magnet first optimization of the
  concept of the solenoid double coil design
• provide magnetic field for guiding Møller
  electrons away from detectors.
• allow operation of longitudinally polarized
  target
• minimize of stray field at HTCC photomultipliers
• PED RD plans
• Detailed PED and RD plan has been developed in
  close collaboration with ( ITEP Kurchatov
  TRINITI) collaboration toward the Reference
  Design of the CLAS12 Magnets Torus and Solenoid
• IKT will lead the design effort of the CLAS12
  Magnets in close coordination with JLab staff.

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Hall B RD and PED Plan FY07
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Hall B RD and PED Plan FY07
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Summary of FY06 Advance Conceptual Design

• Significant progress has been made to
  advance the conceptual design of the CLAS12 Torus
  Magnet and the Solenoid Magnet, this work
  resulted in very significant progress towards
  the reference design.
• Torus Magnet two design options
• design approach based on the IKT technology
• design based on conventional technology similar
  to CLAS Torus
• Solenoid Magnet first optimization of the
  concept of the solenoid double coil design
• provide magnetic field for guiding Møller
  electrons away from detectors.
• allow operation of longitudinally polarized
  target
• minimize of stray field at HTCC photomultipliers