Fermilab AAC MCTF 08/08/07MCTF Hardware Plans1 MCTF Hardware Development Plans Michael Lamm Focus on Support for Muon Collider Magnets at Fermilab

Fermilab AAC MCTF 08/08/07MCTF Hardware Plans2 MCTF Magnet Effort 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 **Called out in MCTF charge**

Fermilab AAC MCTF 08/08/07MCTF Hardware Plans3 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

Fermilab AAC MCTF 08/08/07MCTF Hardware Plans4 Conceptual Design Decision 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 Novel Small Bore Helical Cooling Channel Magnet Design and tracking studies presented at ASC06 & PAC07 by Vl. Kashikhin and K. Yonehara et al

Fermilab AAC MCTF 08/08/07MCTF Hardware Plans5 Design Parameters for Helical Solenoid Latest parameters from: MOPAS012 PAC07 Vl. Kashikhin et al ParameterUnitValue Inner bore diameterm0.5 Helical Solenoid lengthm3.2 Helix twist pitchm1.6 Radius of beam reference orbitm0.255 Initial dipole field, B  T1.25 Dipole field gradient,  B  /  z T/m-0.17 Initial quadrupole field,  B  /  r T/m-0.88 Quadrupole field gradient,  2 B  /  r/  z T/m Initial field, B z T-3.86  Longitudinal field gradient,  B z /  z T/m0.54 NbTi superconductor peak field T5.7 Operational current kA10 Operating stored energy MJ4.4 Coil section length along Z axis mm20 Superconducting cable length km3.3 Manageable SC peak field, stored energy, operating current, SC cable length

Fermilab AAC MCTF 08/08/07MCTF Hardware Plans6 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

Fermilab AAC MCTF 08/08/07MCTF Hardware Plans7 Demonstration Magnet (II) ParameterModel Nominal Model Max MANX Peak superconductor field3.3 T4.84 T5.7 T Current9.6 kA14 kA9.6 kA Number of turns/section10 Coil inner diameter420 mm 510 mm Lorentz force/section, Fx70 kN149 kN160 kN Lorentz force/section, Fy12 kN25 kN60 kN Lorentz force/section, Fxy71 kN151 kN171 kN Lorentz force/section, Fz157 kN337 kN299 kN Turns smooth transition area Coil sections, slightly smaller in diameter to fit into vertical Dewar, are shifted in transverse direction to model MANX system with the orbit radius m and helix period 1.6 m. Model will experience Lorentz forces comparable to MANX experiment From: Vl. Kashikhin

Fermilab AAC MCTF 08/08/07MCTF Hardware Plans8 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

Fermilab AAC MCTF 08/08/07MCTF Hardware Plans9 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

Fermilab AAC MCTF 08/08/07MCTF Hardware Plans10 High Field Solenoid Proposed for end of cooling channel for final emittances T DC, 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 T 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

Fermilab AAC MCTF 08/08/07MCTF Hardware Plans11 J e (B,4.2 K) of HTS Conductors circa 2005 Unpublished data, Schwartz, Trociewitz, Weijers & Schneider-Muntau Bi2212 YBCO Bi2223 Private Communication: J. Schwartz NbTi Limit Nb3Sn Limit

Fermilab AAC MCTF 08/08/07MCTF Hardware Plans12 Conductor Testing at Fermilab B SAMPLE IB Probe for Angular Measurements Courtesy of E. Barzi

Fermilab AAC MCTF 08/08/07MCTF Hardware Plans13 Example of Measurements Performed Bi-2223 Studies performed on Bi-2223 and YBCO tape (not shown) show Strong angular dependence Studies performed over a wide range of angles, temperatures and fields E. Barzi, SC R&D Lab Also extensive temperature and field studies on Bi 2212 wire (not shown)

Fermilab AAC MCTF 08/08/07MCTF Hardware Plans14 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

Fermilab AAC MCTF 08/08/07MCTF Hardware Plans15 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

Fermilab AAC MCTF 08/08/07MCTF Hardware Plans16 Numerical structural analysis An example of the coil support structure (not optimum geometry in terms of cost or size). B=0T B=50T HTS Coils NbTi/Nb3Sn Coils Supports structure Va. Kashikhin  HTS <160MPa, but B max ~44T

Fermilab AAC MCTF 08/08/07MCTF Hardware Plans17 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

Fermilab AAC MCTF 08/08/07MCTF Hardware Plans18 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

Fermilab AAC MCTF 08/08/07MCTF Hardware Plans19 Conclusion 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