NLC - The Next Linear Collider Project Status of Magnet R&D Nov. 7 th 2002 James T Volk Fermilab James T Volk 11/07/2002

NLC - The Next Linear Collider Project People Involved Joe DiMarco, Vladimir Kashikin, James T Volk Fermilab Scott Anderson, Seung Rhee, Cherrill Spencer, James Spencer, Zack Wolf SLAC Steve Gottschalk STI Optronics Bellevue Washington James T Volk 11/07/2002

NLC - The Next Linear Collider Project Prototype Electromagnetic NLC Linac Quadrupole, Under Test Synflex Water Hoses DC Power LeadModified Motor Quick Disconnect Recessed Core Belt C1006 Solid Steel Modular Core, mm long Potted Coil, 21 Turns Thermocouple Thermal Switch 1/4” Round,Seamless Cu Tubing, Monolithic Coil Lead Electro Quad on SLAC test stand James T Volk 11/07/2002

NLC - The Next Linear Collider Project Y coordinate of the electromagnetic quad’s magnetic center measured over 2.5 days Current changed in a BBA sequence:black circles are Y center at 80 amps, open circles are Y at 5 different currents which quad would be run at for a BBA: 64, 67.2, 70.4, 73.6, 76.8 amps Variation in Y during any one BBA sequence to be < 1 micron is satisfied. Run 31, 25 th –28 th October 2002

NLC - The Next Linear Collider Project Wedge Quad James T Volk Pole magnets Wedge magnet Tuning rods 11/07/2002

NLC - The Next Linear Collider Project SLAC Rotating Coil Data 11/07/02 James T Volk

NLC - The Next Linear Collider Project Rotational quadrupole assembly Stepping motor Rotational quadrupole assembly (side view) Correction coils V.S.Kashikhin Rotational Quadrupole with Correction Coil System 11/07/2002

NLC - The Next Linear Collider Project Correction coils Rotational quadrupole control system First analog active correction system test… in progress Without correction With active correction V.S.Kashikhin

NLC - The Next Linear Collider Project 1  m center shift = 1 G dipole field = 1 A correction coil current Integrated signal from measuring coil during magnets rotation Amplifier - Integrator Power Supply Measuring coil Correction coil Active Correction System Rotational Quadrupole with Correction Coil System V.S.Kashikhin Center shift vs. correction coil current 11/07/2002

NLC - The Next Linear Collider Project Counter Rotating quad 1 um center stability with correction coil 11/07/2002 V.S.Kashikhin micronsmicrons

NLC - The Next Linear Collider Project STI Phase I PM Quad Prototype Results Work Supported by Department of Energy Grant DE-FG03-01ER83305 AN SBIR grant to Steve Gottschalk Of STI Optronics of Bellevue Washington An adjustable quad where the magnet material moves James T Volk 11/07/2002

NLC - The Next Linear Collider Project STI Phase I prototype on SLAC bench All tests done by moving two magnets out of four Pole Dovetail slide Rotating coil Stationary magnets (2) Moving Magnets (2 ) James T Volk 11/07/2002

NLC - The Next Linear Collider Project Results on Phase I prototype Strength is linear with brick retraction Sextupole is acceptable and doesn’t change during retraction of 2 bricks James T Volk 11/07/2002

NLC - The Next Linear Collider Project Centerline adjustment results Mechanical advantage 10X Linear shift with brick retraction Short term centerline repeatability is 0.4 microns Fine tune of brick shift with strength can make X CL zero at all retractions James T Volk 11/07/2002

NLC - The Next Linear Collider Project Long term X centerline results* Initial increase of X CL by 6 microns with spinning coil due to magnet supports Hall probe doesn’t show the same effect Improve supports for magnet and granite block Hall probe x CL Spinning coil x CL James T Volk 11/07/2002

NLC - The Next Linear Collider Project Phase II prototype Full size Engineered! Motorized –4 NEMA 17 servo motors –Ethernet servo controller – Galil DMC2142 –Temperature compensated Preloaded Ball screws and linear guides 4X faster movement than NLC (neglecting eddy currents) Modular for flexibility Servo parts have been ordered Magnets, poles will be ordered soon James T Volk 11/07/2002

NLC - The Next Linear Collider Project Preliminary Phase II Quad Design James T Volk 11/07/2002

NLC - The Next Linear Collider Project Preliminary Phase II prototype schedule Engineering design complete March 2003 Fabrication complete May 2003 Testing starts May 2003 Majority of prototype tests completed Sept 2003 Spinning coil fabrication completed March 2003 (STI cost share) James T Volk 11/07/2002

NLC - The Next Linear Collider Project Poles Magnets Rotating ring Halbach Ring Quad James T Volk 11/07/2002 LCRD Grant Proposal by J Rosenzweig To build one

NLC - The Next Linear Collider Project Failure Modes and Effects Analysis to Calculate Life Cycle Cost for NLC Electro and Perm Magnets $S $WC Water Cooled Coils Solid Wire Coils $SPS $LPS Magnet Power Supply $LPS 2nd Stage: Calculate Permanent Magnet Life Cycle Cost Mostly Using Component Failure Rates In Progress 3rd Stage: Compare 1 st and 2 nd Stage Results to Help Determine Magnet Technology for NLC 1 st Stage: Calculate Electromagnet and Power Supply Life Cycle Cost Using SLAC Data Reporting on this today James T Volk 11/07/2002

NLC - The Next Linear Collider Project Monte Carlo Simulation Variables: Detection Time, Fixing Time, Delay Time, Quantity, Parts Cost Life Cycle Cost (30yr) FMEA for Electromagnet with Monte Carlo Simulation Partial List of Failure Modes ($) James T Volk 11/07/2002

NLC - The Next Linear Collider Project Estimating Frequency of Water Blockage from Empirical Data Obtained failure history (CATER system) for 5 year period ( ) Expected Downtime = (1-Availability) x Operation hour/year (due to water flow blockages) = ( ) x 6480 hour/year = 6.4 hour/year (if NLC uses all electromagnets) Occurrence = Expected Downtime / MTTR = 6.4 / 3.02 = 2.1 / year James T Volk 11/07/2002

NLC - The Next Linear Collider Project Estimate for Availability of all Power Supplies for NLC Estimate for Availability of all Electromagnets for NLC Estimating Overall Electromagnet System Availability for NLC Magnets + Power Supplies (with redundant large PS ) Downtime for all types of magnet failures Total: 7167 Magnets Total: 6167 Power Supplies MTBF+MTTR MTBF Availability = James T Volk 11/07/2002

NLC - The Next Linear Collider Project Predicted Power Supply Life Cycle Cost Units: Million Dollars Predicted Electromagnet Life Cycle Cost for 30 yrs Using Monte Carlo Simulation (5000 runs) Units: Million Dollars # of correctors: 2202 # of water cooled magnets: 4965 # of small PS: 2785 # of large PS: % of the time the simulation predicts less than this amount James T Volk 11/07/2002

NLC - The Next Linear Collider Project Radiation Damage Neodymium Iron Boron is an attractive material for use in Permanent magnets James T Volk 11/07/2002 Radiation damage issues –Lower cost than Samarium Cobalt –Higher energy density than Samarium Cobalt –Less brittle easier to work with –Not well measured especially for higher coercivity materials –But not as resistant as Samarium Cobalt –Issues with activation of Boron Need to test different manufactures and different coercivities

NLC - The Next Linear Collider Project Radiation Damage Radiation Damage to Permanent Magnets LCRD 2.24 –Lucien Cremaldi Unv. of Mississippi –James Volk Fermilab Expose magnets to gamma rays –Cs KeV gamma 180 rad/hr 0.18 Mrad –Co MeV gamma 80 Krad/hr 80 Mrad James T Volk 11/07/2002

NLC - The Next Linear Collider Project Radiation Damage Radiation damage studies of materials and electronic devices using hadrons LCRD proposal –Dave Pellett and Max Chertok of UC Davis –James Spencer of SLAC –James Volk of Fermilab James T Volk 11/07/2002 Use the McClellan Nuclear Reactor Center (MNRC) in Sacramento and UC Davis Crocker Nuclear Lab at Davis –Do both thermal and fast neutrons –Use small quads that fit into rabbit holes –Working on getting spectrum for damping rings and LINAC

NLC - The Next Linear Collider Project Radiation Damage James T Volk 11/07/2002 FacilityThermal <.1 Ev (n/cm 2 -s) Fast > 1 MeV (n/cm 2 -s) Heating in Aluminum (W/g) Heating in Tissue (W/g) Diameter (cm) Length (cm) CIF (Water) 4.5 * * CIF (Void) 3.2 * PTS (Void) 1.4 * * NTD (Water) 6.3 * * NTD (Void) 7.3 * CIF Central Irradiation Facility PTSPneumatic Transfer System NTDNeutron Transmutation Doping UC Davis MNRC Irradiation Facility

NLC - The Next Linear Collider Project MNRC Rabbit can James T Volk 11/07/2002

NLC - The Next Linear Collider Project Radiation Damage 2.125” 1.125” Magnet material Gap (variable) Flux return James T Volk 11/07/2002

NLC - The Next Linear Collider Project Prototype of Radiation test quad Magnetic material Al spacers Gap for hall probe Direction of B orange arrow 11/07/2002

NLC - The Next Linear Collider Project Radiation Damage Beam pipe between 2 dipoles At Ring to LINAC Septum ceiling Calibration 10 7 /sec

NLC - The Next Linear Collider Project Radiation Damage Have 2 grants in to study radiation damage in ND-Iron Boron Working up designs for magnets to fit available space Measuring spectrum in damping rings Expect to get some data on radiation damage by this winter Should have good data by Summer –This will of course lead to more questions, experiments, grants, … –Present data at 18 th International Conference on Magnet Technology in Oct 04? James T Volk 11/07/2002

NLC - The Next Linear Collider Project Future Plans Continue work on understanding and improving measurement system Work on motorized drives for PM quads Work on active correction coils for PM Continue reliability studies on EM and PMs Radiation damage studies 11/07/2002

NLC - The Next Linear Collider Project Summary Slow and steady progress on various adjustable quads Understanding measurement systems and make improvements Reliability studies continue Radiation damage studies beginning should have results by next MAC James T Volk 11/07/2002