fermilab 02/01/07nfmcc on mctf magnets1 magnet r&d… through the mctf michael lamm

02/01/07NFMCC on MCTF Magnets 1Fermilab

Magnet R&D… through the MCTF

Michael Lamm


MCTF Magnet Effort

• Support specific magnet project for 6D Cooling Demonstration– Helical Cooling Channels and Matching Sections*

• Longer Term Magnet R&D– 50 T Solenoid*

– Next generation Helical Solenoid (future Muons Inc SBIR)

– Collider and IR magnets?

– Provide Coordination for Muon Magnet Program for Fermilab Muon Experiments

– Interface with AP and Detector groups

– Coordinate activities with other magnet laboratories (BNL, FNAL, LBNL, NHMFL, Muons Inc.)

*Called out in MCTF charge and primary R&D focus


FNAL Superconducting Magnet Program

• All phases of accelerator magnet development, incl. superconductor R&D test and support

• Long history of SC magnets (Tevatron, SSC, Fermilab/LHC IR quads…)

• Present primary focus is on Nb3Sn Quadrupoles for LHC IR upgrade, as part of LARP, but also, HINS, ILC, Muon Collider and Tevatron support

• Projects such as Muon Magnets R&D depends heavily on Fermilab base support for SC Magnet R&D– Provides for infrastructure support

– Provides salary and M&S support for R&D beyond project scope


Helical Cooling Channel

• Cooling Channels proposed by Muons Inc for MANX experiment. Time scale for demonstration: 2010

• Solenoid, with superimposed helical quad/dipole filled with low Z material can reduce 6D emittance

• Recent work by Vl. and Va. Kashikhin+ K. Yonehara present two practical designs for MANX muon cooling demonstration. (see Yonehara talk)

• SBIR have been submitted to carry this program to cooling channels suitable for full scale muon collider


Plan for Production Helical Solenoid

• FY06– Tracking studies– Two designs under consideration

• FY07– Complete Design Comparison/Design Decision– Build “engineering model/demonstration coil” to test concept– Design Specifications, conceptual design, and Prototype plan presented in

Sept 2007 report

• FY08– Complete Engineering Design– Bids placed, prototype built in Industry– Test (in sections) at Fermilab Magnet Test Facility– Preproduction Review

• FY09– Production Magnets order placed– Installation in Muon Cooling Experiment as available through 2010

Outlined in MCTF proposal…based on a proposed level of support…..


Large Bore Option

SEE ASC 2006 Publication: Kashikhin et al, 1LL07


Helical Solenoid

The solenoid consists of a number of ring coils shifted in the transverse plane such that the coil centers follow the helical beam orbit. The current in the rings changes along the channel to obtain the longitudinal field gradients.

One can see that the optimum gradient for the helical solenoid is -0.8 T/m, corresponding to a period of 1.6 m.


Concept Decision in FY07

Issues for making designs:

• Heavily dependent on (un)certainty about the design of the experiment– Small bore design is modular, less expensive to build

and test. Large bore design is easier to adapt once built.

• Conceptual design work on matching sections

• Resource loaded schedule for magnet system including mechanical design, cryostat design, quench protection, etc. to estimate labor/M&S for each design

General consensus is that small bore option is the preferred solution


Design Tasks in FY07

• Mechanical Designs for coils structure (small bore segmented solenoid option)

• 5cm multiturn stack of hardway bend NbTi cable (LHC IR), potted? shrink cylinder for radial forces

• Mechanical support for longitudinal compression• Sets of coils locked into transverse tracks to withstand expected

300kN longitudinal (end) and 200kN transverse restoring force• Helium vessel 4 meter long x 1 meter diameter cylinder• Goal to build demonstration coil (s) + support this year

• Electrical design- linear longitudinal decrease in field accomplished by:

• Separate PS (5-10 kA systems, each with separate controls etc..) or segmentation by cold diodes

• Nested PS (multi small current leads)• Coil density (reduces modularity)


Design Tasks in FY07

• Cryo-issues• Coils + beam space in same Helium volume…

• How does design match MTA cryo plant?

• Expected max static heat load ~ ten Watts.. No appreciable beam issues.. Multiple power leads (if needed) have to be laid out

• Lots of LHe dead space.. Need displacer system to reduce helium volume

• Quench Protection .. 4 MJ stored energy• Coils will be coupled

• Dependent on coil powering

• Regardless, adjacent segments are magnetically coupled

• We have experience with this LHC cable: should be easy to model (MIITS, quench velocity etc..)

• Is external extraction circuit or heaters needed?


Superconducting Coil Test Facility

Number of circular sections 3Middle section removableInner section diameter 400 mmInner coil diameter 420 mmOuter section diameter 500 mmCenter section shift in transverse Y direction 60 mmCoil length along Z 50 mmCoil total current 262 kAConductor current 10.5 kA

Coil number of turns 25Force in Z direction 353 kNForce in Y direction (middle coil) 234 kN

Superconducting coils can be tested using Vertical Dewar at FNAL Magnet Test Facility

Test Stand with 30 kA power supply, quench protection and computer control systems.

Stand has 600 mm inner bore diameter.

Helical Solenoid Forces

Section N Fx, kN Fy, kN Fz, kN

1 -185 -63 304

36 74 -11 -8

73 -49 18 -81

Coils shifted 55.5 mm in radial direction, Frmax=196 kN


Three Coils Set

Coil centers:

X, mm Y, mm Z, mm

0 255 0

55.2 249 55.6

107.8 231.1 111.1

Quench Protection/Characterization-use energy extraction circuit

-instrument with voltage taps

-middle coil instrumented with “spot heaters”

Magnetic Field measurements-Hall Probes


How this is accomplished in FY07

• Yonehara/Kashikhin/Kashikhin continue to validate two designs + matching section

• Practical details of how this magnet would be designed. (ie. Cable vs strands, mechanical support, alignment, cryostat)

• Additional 0.5 FTE of existing staff + ?

• Contract designer

• Work with TD/Test and Instr. Dept. on testing plans

• Coil(s) can be tested in vertical dewar

• Cable from LHC IR quads is available but need to purchase all other materials for demonstration coils

Progress beyond paper studies requires additional $$$ beyond base budget


50 T Solenoid

• See talks by Palmer and Kahn• Proposed for end of cooling channel for final

emittances• 50 T DC, 30 mm aperture, 1-2 m length• Superconducting for manageable power reqs

– HTS or HTS/Nb3Sn/NbTi hybrid

• Beyond present capabilities (has never been attempted)– Proposals to built 25-30 T HTS solenoids– Conceptual design studies performed with Muons Inc. in

collaboration with BNL.


• Conceptual design of 50 T solenoid ongoing, Kahn Muons Inc. and Palmer/Gupta at BNL See EPAC06 WEPLS108

Interest in HTS for high field solenoids

• NHMFL has developed 5 T HTS insert, for 25T solenoids

• Muons Inc has pending SBIR’s on HTS application to magnet design

• Fermilab, BNL and LBNL experience on conductor and small coils

• “2212 day” workshop organized by Tollestrup & Larbalestier November 6, 2006


Outline for MCTF 50 T Solenoid

• Up to and Including FY06 – Significant work done by Muons Inc. on Magnet Concept– Muons Inc supported work on HTS materials at Fermilab– Prepare plan for Sept 2006 report

• FY07– Focus on Material Studies, available materials, relation to magnet design– 1-5 T insert(s) suitable for SC R&D lab 16 T or 17 T Teslatron or BNL SC

conductor test facility– Present Status of Feasibility Study and Conceptual Design as part of Sept

2007 report• FY08

– Material Choice(s)– Develop Measurement equipment for Feasibility Study– Lower field prototype to study Design Feasibility ?– Engineering Design???

• FY09– ?


2007 Effort on 50 T R&D

• Evaluation of HTS Materials– BSCCO 2212 wires/cable

– We have requested samples of BSCCO and YBCO tapes from conductor vendors

• Mechanical/electrical probe design and construction– Tensile strain

– Field orientations

• HTS coil insert designs– 1-5 T insert(s) suitable for SC R&D lab 16 T or 17 T Teslatron

• Investigate possible collaborations/cooperations with NHMFL, BNL, Muons Inc and others….to develop long term strategy


Other magnet related work

• MCTF Proposal calls for magnet effort at LBNL on Collider Dipoles

• Design studies for muon collider dipole (open midplane vs. absorber )

• Open midplane dipole made from existing Nb3Sn coils

• Unlikely to perform studies without additional support

Gupta et al “Optimization of Open Midplane Dipole Design for LHC IR Upgrade” PAC07


Magnet Conclude

• Fermilab continues to work with Muons Inc to make Helical solenoid with ~2010 delivery date– In FY07 need to develop detailed plan which leads to

delivery of helical solenoid.

• 50 T Solenoid with FNAL, BNL and Muons Inc. Work focused on materials for first year. Goal to make 1-5 T insert suitable for ~15 T Teslatron with 77 mm bore. – FY07 will be a year of studying HTS materials, building

a collaboration to coordinate long term effort

Need requested additional resources to make progress past paper, especially if Helical Cooing Channel required in 2010

fermilab 02/01/07nfmcc on mctf magnets1 magnet r&d… through the mctf michael lamm

Documents

mctf magnets1 magnet

mctf magnets7 helical

muon magnet program

mctf charge

sc magnet rd

fermilab base support

muon magnets rd

muon cooling experiment