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MCTF Hardware Development Plans. Focus on Support for Muon Collider Magnets at Fermilab. Michael Lamm. MCTF Magnet Effort. **Called out in MCTF charge**. Primary Focus on Support specific magnet projects for 6D Cooling Demonstration Experiment Helical Cooling Channels and Matching Sections

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mctf hardware development plans
MCTF Hardware Development Plans

Focus on Support for Muon Collider Magnets at Fermilab

Michael Lamm

MCTF Hardware Plans

mctf magnet effort
MCTF Magnet Effort

**Called out in MCTF charge**

  • Primary Focus on
    • Support specific magnet projects for 6D Cooling Demonstration Experiment
      • Helical Cooling Channels and Matching Sections
      • Coordination with AP and Detector groups
    • Very high field solenoid for final stages of cooling
      • HTS Conductor R&D
      • Magnet Design
      • Organization of a National Collaboration
  • Other tasks
    • Next generation HCC (newly approved Muons Inc SBIR)
    • Collider and IR magnets for Muon Collider

MCTF Hardware Plans

helical cooling channel
Helical Cooling Channel
  • Cooling Channels proposed by Muons Inc for MANX experiment. (See R. Johnson and K. Yonehara presentations)
  • Time scale for experiment: ~2010
  • Solenoid, with superimposed helical quad/dipole filled with low Z material can reduce 6D emittance
  • No RF Cavity
    • HCC field reduced along helix to compensate for dE/dx loss
    • Design should be compatible with adding RF in future

MCTF Hardware Plans

conceptual design decision
Conceptual Design Decision

Novel Small Bore Helical Cooling Channel

  • Coil geometry tracks central trajectory
  • ~0.5 m diameter thin solenoids, offset transversely.
  • Dipole and quad fields are a consequence of offset, coil diameter and helical periodicity
  • Features
    • Small magnet volume
    • Modular assembly of coils
    • Flexibility in assembling magnet
    • Able to test concept on a smaller scale: demonstration magnet

Magnet Design and tracking studies presented at ASC06 & PAC07 by Vl. Kashikhin and K. Yonehara et al

MCTF Hardware Plans

design parameters for helical solenoid
Design Parameters for Helical Solenoid

Manageable SC peak field, stored energy, operating current, SC cable length

Latest parameters from: MOPAS012 PAC07 Vl. Kashikhin et al

MCTF Hardware Plans

demonstration magnet

Outer bandage rings

Inner bobbin

Superconducting coils (one layer, hard bend wound)

Demonstration Magnet
  • Features
    • Use existing SC cable from SSC surplus inventory
    • Test in Vertical Magnet Test Facility
      • This puts some constraints on the geometry of this demonstration magnet while providing large flexibility in test parameters
  • Part of STTR phase II proposal from Muons Inc with Fermilab Recently approved!
    • Labor for design, fabrication and test through STTR
    • Materials and some contract labor from Fermilab via MCTF/APC
  • Goals for Demo magnet
    • Validate Mechanical Structure
    • Develop Field quality measurement
    • Study quench protection issues

MCTF Hardware Plans

demonstration magnet ii
Demonstration Magnet (II)

Coil sections, slightly smaller in diameter to fit into vertical Dewar, are shifted in transverse direction to model MANX system with the orbit radius 0.255 m and helix period 1.6 m.

Turns smooth transition area

Model will experience Lorentz forces comparable to MANX experiment

From: Vl. Kashikhin

MCTF Hardware Plans

demonstration magnet status
Demonstration Magnet Status
  • Design work started prior to start of STTR phase II
    • Mechanical/Magnetic Design underway
    • COMSOL 3D FEM electromagnetic and stress analysis shows coil stress a very manageable <50 MPa at peak field.
  • Need approximately 3-4 km of SSC inner cable for MANX experiment. We have acquired over 10 km from SSC cable surplus. Tests will be performed on extracted stands this fall to validate expected strand performance.
  • Internal design review sometime in Fall 2007/Winter 2008
  • Goal is to test magnet in Fall 2008

MCTF Hardware Plans

hcc issues
HCC Issues
  • Demonstration magnet should validate magnetic and mechanical design by end CY08
  • Decide if matching sections are required for MANX
  • Complete specification for full scale MANX HCC including: field quality and “in situ” field monitoring; interface with particle tracking; cryostat details including helium requirements; powering scheme for dE/dx loss compensation; quench protection; other infrastructure needs
  • Need approximately 2 years from final design to magnet fabrication and installation, i.e. need to complete studies in 2008 for a 2010 schedule

MCTF Hardware Plans

high field solenoid
High Field Solenoid
  • Proposed for end of cooling channel for final emittances
  • 30-50 T DC, 30-50 mm aperture, 1-2 m length
  • Goals: Highest practical field, accelerator field quality, low manufacturing cost, low operating costs
  • Superconducting for manageable power reqs
    • Existing very high field magnets are resistive or resistive/SC hybrids  Megawatt Power, one-of-a-kind, expensive to build/operate
    • Engineering current density (Je) of HTS materials measured up to 45 T, have a mild dependence on B… however..
    • Building this solenoid is beyond present capabilities, although 25-30T HTS solenoids are proposed
  • MCTF program for FY07
    • Conductor testing (Bi2212 wire, Bi2223 and YBCO tapes)
    • High Field Solenoid Magnet Design
    • Organizing National Program for High field HTS Magnets

MCTF Hardware Plans

j e b 4 2 k of hts conductors circa 2005

NbTi Limit

Nb3Sn Limit




Je(B,4.2 K) of HTS Conductorscirca 2005

Private Communication: J. Schwartz

Unpublished data, Schwartz, Trociewitz, Weijers & Schneider-Muntau

MCTF Hardware Plans

conductor testing at fermilab
Conductor Testing at Fermilab

Probe for Angular Measurements





Courtesy of E. Barzi

MCTF Hardware Plans

example of measurements performed
Example of Measurements Performed


  • Studies performed over a wide range of angles, temperatures and fields

Studies performed on Bi-2223 and YBCO tape (not shown) show Strong angular dependence

Also extensive temperature and field studies on Bi 2212 wire (not shown)

E. Barzi, SC R&D Lab

MCTF Hardware Plans

high field solenoid designs
High Field Solenoid Designs
  • Two studies high field solenoid studies related to the MCTF have been performed in the last ~15 months
    • Steve Kahn and Bob Palmer
      • Discussed in MCTF talk at Dec 2006 AAC meeting
      • Updated at Low Emittance Workshop
    • Vadim Kashikhin and Sasha Zlobin
      • Presented at Low Emittance Workshop
      • Updated version to be presented at MT-20 August 2007
    • Parameters
      • Hybrid magnet with NbTi, Nb3Sn and HTS superconductor
      • Utilize Bi-2223 tapes (steel reinforced, long lengths and reasonable Jc)
      • Bi-2212 wire is also possible

MCTF Hardware Plans

analytical model
Analytical model
  • An example of the optimum geometry in case when 25% of support material is introduced in the coils. Use parameterization of Bi2223 angular dependence data.

Minimum cost criterion Minimum Diameter criterion

Va. Kashikhin

MCTF Hardware Plans

numerical structural analysis
Numerical structural analysis
  • An example of the coil support structure (not optimum geometry in terms of cost or size).

Va. Kashikhin

NbTi/Nb3Sn Coils

HTS Coils

Supports structure

B=0T B=50T

sHTS<160MPa, but Bmax~44T

MCTF Hardware Plans

national collaboration on hts magnet r d
National Collaboration on HTS Magnet R&D
  • There is little or no market for HTS materials relevant for high field scientific applications.
  • From discussion with HTS Vendors, sustained support from magnet community is needed to make progress. Need effort comparable to successful Nb3Sn Conductor Program
  • Proposal “White Paper” (David Larbalestier, Lance Cooley, Ken Marken and Alvin Tollestrup) to form collaboration among interested National Labs, Universities and HTS vendors to develop program
  • Broad Collaboration of NMR, material science and HEP application interested in >23 T at 4 K and >10 T at 20 K

MCTF Hardware Plans

collaboration plans
Collaboration Plans
  • Ongoing discussions among the National Magnet Labs and University representatives to write a proposal to DOE
    • Identify common ground for conductor needs
    • Consolidate existing data on conductor tests
    • Identify facilities and resources
    • Near term and longer term plans for magnet related conductor development and testing, magnet development
  • Goal for preliminary proposal: Fall 2007

MCTF Hardware Plans

  • MCTF made significant progress this year, largely through magnet program base support, Muons Inc. collaboration and support from MCTF/APC
  • Helical cooling channel design for MANX advances
  • Short demonstration HCC magnet will be built and tested with support from Muons Inc. and MCTF/APC
  • HTS conductor studies continue at Fermilab (and elsewhere) on a range of materials, as a function of field, field angle, temperature
  • Paper studies of High Field Solenoids show feasibility and difficulties in building magnets beyond the 40 T range
  • Plans for a National Program for HTS High Field Magnets have begun

MCTF Hardware Plans