F James T Volk June 20021 Permanent Magnets for Linear Colliders James T Volk Fermilab.

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Presentation transcript:

f James T Volk June Permanent Magnets for Linear Colliders James T Volk Fermilab

f James T Volk June People already working on Permanent magnets SLAC Seung Rhee, Cherrill Spencer, Jim Spencer SLAC Magnetic Measurement Group Scott Anderson, Zack Wolf Fermilab Magnetic Measurement Joe DiMarco LBNL Jose Alonso, Jin-Young Jung

f James T Volk June Why Permanent Magnets No Power Supplies No Cables No Water Cooling No Operating Expense Temperature stable Time stable Easy to Assemble Can be in-expensive depending on field required and material chosen

f James T Volk June Where can they be used Fixed energy transport lines Bending Focusing Injection or extraction Storage Rings Final Focus near or inside of detectors Quadrupoles in the NLC Damping Rings

f James T Volk June Permanent Magnets at SLAC SLC 72 Sextupoles made of Sm 1 Co 5 SLC final focus 4 Octupoles made of SM 2 Co 17 PEPII two normal and two skew Quadrupoles made of SM 2 Co 17 All small Halbach style magnets

f James T Volk June Fermilab Recycler 8 GeV transfer line: 750 m long from booster to MI Gradient Mirror gradientSextupole Recycler: 8 GeV anti proton storage ring Over 500 gradient, quadrupole, and sextupole permanent magnets Temperature stable Fields adjusted to within 5 parts in 10 4 Harmonics 1 part in 10 4 Vertical and Horizontal tune within of design

f James T Volk June Representative Dipole Technologies From Kem Robinson LBNL

f James T Volk June Quads for NLC Quad

f James T Volk June NLC LINAC Quad Specs

f James T Volk June Wedge Quad Rods rotate to adjust field Pole Magnets Tuning Rods Wedge Magnets Flux Return Poles

f James T Volk June NLC adjustable quad on SSW stand Quad Stretched wire stages

f James T Volk June Wedge Quad Rod Turning Mechanism Tuning Rod May 2002 James T Volk Pin slides in slot turning rod

f James T Volk June Center shifts wedge quad

f James T Volk June SLAC Rotating Coil Data X max 2.5  Y max 4.5 

f James T Volk June Counter Rotating Quadrupole

f James T Volk June Counter Rotating Quad Data

f James T Volk June Results

f James T Volk June Issues Improve center stability Time stability Temperature stability Motor controls Optimize Design New Designs

f James T Volk June LBNL & SLAC work on designing magnets (PMs and EMs) for the damping rings Main Damping Ring lattices have been published with detailed requirements on all magnets Have 2-D model of DR quadrupoles and transport line dipoles. The Nd Iron style magnets are of reasonable size Investigated the Nd Iron quads, with rotating rods to generate the +/-10% adjustability, in more detail to see if they could meet all the requirements. Jin-Young Jung (LBNL) used TOSCA to make a 3-D model of damping ring magnets

f James T Volk June TOSCA model of ¼ Neo quad with a steel end plate

f James T Volk June Radiation Damage Summary

f James T Volk June Radiation Damage in SM Cobalt

f James T Volk June Radiation-Induced Demagnetization (Japanese experience with 200 MeV protons) Material Type has large impact Red: N48 High Br (1.4T) Low Hc (1.15 MA/m) Blue:N32ZLower Br (1.14 T) Higher Hc (2.5 MA/m) Material Shape has large impact (All samples are discs 10 mm dia) Circle: thickness = 2 mm (Pc = 0.5) Triangle: thickness = 4 mm (Pc = 1.0) Square: thickness = 7 mm (Pc = 2.0) - Higher Permeance coefficient increases resistance (x 10) SmCo is much more resistant than NdFeB

f James T Volk June Radiation damage tests Variety of particles p, n, d, , e used ND-Iron Radiation damage not well determined Energy is low Kev to Mev range No consistent dosimetry used All done on free bricks not magnets!

f James T Volk June Radiation Test Dipole Design PM Material 2 inch gap

f James T Volk June Radiation Damage Issues Identify Radiation fields where PM could be used Obtain consistent data on magnetic field loss Determine Magnetic Field loss as a function of Type of radiation Amount of radiation Dependence on Hc and other magnet parameters Dependence on manufacturer

f James T Volk June Conclusions There is plenty of work to do with permanent magnets Improve quads for the LINAC Investigate other applications Measure effect of radiation on various magnet material Plenty of real work to do!