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Magnetic Measurements: status report and future challenges

f. Magnetic Measurements: status report and future challenges. Hank Glass*, Fermilab Provocateur talk, Working Group T2 (Magnets) Snowmass, July 2001 *with J. DiMarco, P. Schlabach, G. Velev. Outline. Brief overview of activities at Fermilab Probes: harmonics coils, stretched wire

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Magnetic Measurements: status report and future challenges

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  1. f Magnetic Measurements:status report and future challenges Hank Glass*, Fermilab Provocateur talk, Working Group T2 (Magnets) Snowmass, July 2001 *with J. DiMarco, P. Schlabach, G. Velev

  2. Outline • Brief overview of activities at Fermilab • Probes: harmonics coils, stretched wire • Magnet projects: • LHC, VLHC Stage-1 and Stage-2, NLC • Future plans and challenges • Subgroup tasks Working Group T2: Magnet Technology Provocateur talk: Magnetic Measurements

  3. New/Improved measurement tools • New test stand for superfluid He tests of LHC quads • New rotating coils with new measurement software (object-oriented) • Single-stretched wire (ssw) for integral strength and alignment Working Group T2: Magnet Technology Provocateur talk: Magnetic Measurements

  4. MQXP001 on Stand 4 First full-length prototype of LHC IR triplet Q2 Two thermal cycles so far, 3rd TC begins mid July (~now) Magnetic measurements and quench testing done below l point ( 2 K) Working Group T2: Magnet Technology Provocateur talk: Magnetic Measurements

  5. 3-segment Harmonics Coilfor LHC IR Quad • 3.688 m • 5.948 m • 8.522 m • 9.591 m Q2P1 Q2P1 Q2P1 Q2P1 Working Group T2: Magnet Technology Provocateur talk: Magnetic Measurements

  6. Harmonics-comparison of MQXP001 with short models 1.500 1.000 q2p1 0.500 Model magnets 0.000 -0.500 -1.000 a10 a8 a9 b5 b3 b4 a6 b7 a4 b6 b8 b9 a7 b10 a3 a5 Working Group T2: Magnet Technology Provocateur talk: Magnetic Measurements

  7. Single Stretched Wire System (SSW) • Single (100mm) wire stretched between precision x-y stages with 1mm accuracy linear encoders. • Integrator measures flux change caused by wire motion - flux change same for +/- wire motions when wire centered in quadrupole. • Measurement of true axis (not just average) with co- and counter-directional stage motions. • Stages have laser tracker target fiducial mounts referenced to wire. • Adjustable wire tensioning for removal of effects from sag • Uses include MIQ, LBQ, spool, LHC HGQ, and NLC prototype alignment measurements Working Group T2: Magnet Technology Provocateur talk: Magnetic Measurements

  8. SSW schematic for LHC quad MQXP01 3.6 m 8.6 m 5.5m 17.7 m Working Group T2: Magnet Technology Provocateur talk: Magnetic Measurements

  9. SSW NLC Permanent Magnet Measurements Stability(also see presentation by Kashikhin) Working Group T2: Magnet Technology Provocateur talk: Magnetic Measurements

  10. Measurements of VLHC Stage-1 magnets • Arc dipole physical properties (interesting from measurement point of view): • length = 65 m • aperture vertical gap = 20 mm • Gradient = 4.7% (arc dipoles), 9.4% (dispersion supp.) • C-magnet design allows probe insertion from side • Warm testing (100%), cold testing (~10%?) • Other magnets for Stage-1 present no significant measurement challenges Working Group T2: Magnet Technology Provocateur talk: Magnetic Measurements

  11. VLHC Stage-1 dipole measurement concept Rotating coil positioned by precision strong-back See VLHC Design Study, Section 5.1.7 for details Working Group T2: Magnet Technology Provocateur talk: Magnetic Measurements

  12. Vertical Magnet Test Facility (VMTF) VMTF operating parameters: • Toper =1.8 - 4.5 K • Ioper = 0 - 18.8 kA, upgrade to 30 kA in progress • Magnet length up to 4 m • He volume - 800 liters • tested LHC models (1999-2000) • High Field (Nb3Sn) model tests: • cos  magnet, June 2001 • Racetrack coil, July 2001 • 2nd cos  magnet in Sept. • 1st common coil magnet in Oct. Working Group T2: Magnet Technology Provocateur talk: Magnetic Measurements

  13. VMTF On-line Operations Display Working Group T2: Magnet Technology Provocateur talk: Magnetic Measurements

  14. Magnetic measurement activities at other laboratories Volunteers welcome to give status talks! Working Group T2: Magnet Technology Provocateur talk: Magnetic Measurements

  15. Organizing magnetic measurements subgroup • Please join! • Develop subgroup schedule • Discuss measurement issues for future machines • Write subgroup report Working Group T2: Magnet Technology Provocateur talk: Magnetic Measurements

  16. Challenges and Issues • What are the difficulties facing measurements of: • NLC magnets, especially main linac quads with 1 mm center stability requirement • VLHC Stage-1 and Stage-2 arc magnets • Muon collider or neutrino factory magnets Other magnets for other machines/detectors • What are drivers for future improvements in magnet measurement technology? Working Group T2: Magnet Technology Provocateur talk: Magnetic Measurements

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