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V. Kashikhin for ILC Magnet Group June 6, 2006

Report on e + Transport Line and Damping Ring Magnets. V. Kashikhin for ILC Magnet Group June 6, 2006. e + Transport Lines. 18700 m ?. e + Transport Line Magnet Specs. Y. Batygin, V. Bharadwaj, Y. Nosochkov, J.C. Sheppard, M. D. Woodley, F. Zhou Rev. 1: May 18, 2006

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V. Kashikhin for ILC Magnet Group June 6, 2006

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  1. Report on e+ Transport Line and Damping Ring Magnets V. Kashikhin for ILC Magnet Group June 6, 2006 FNAL, June 6, 2006

  2. e+ Transport Lines 18700 m ? FNAL, June 6, 2006

  3. e+ Transport Line Magnet Specs Y. Batygin, V. Bharadwaj, Y. Nosochkov, J.C. Sheppard, M. D. Woodley, F. Zhou Rev. 1: May 18, 2006 Table 1 lists the magnet requirements for the ILC positron system optics. The id is the minimum diameter for the solenoids. In the case of quardupoles, dipoles, and sextupoles a 2 mm vacuum chamber wall thickness is assumed. Alignment tolerances: 300 microns, absolute, transverse; field quality: 1% sum over allowed harmonics at 2 cm radius; PS tolerance: 10-3 dI/I. Dipole corrector pair for each quadrupole, strength ~50 g-m. BPM for each quadrupole • for quadrupoles; Bpole_tip for dipoles, sextupoles, septa, and kickers; and Bz for solenoids • Effective lengths are suggested; the integrated strengths are important • MPS beam abort, 50 mradian kick per kicker, 0.75 mrad total kick, same as BDS kickers. • MPS beam abort, 4.75 mrad per septum, 28.5 mrad total kick. • 7 m FD quadrupole spacing • 12.3 m FD quadrupole spacing • Quantity includes 2 primary and 1 keep alive target capture regions • 125 MeV e+/e- separator/target bypass optics, includes 2 primary and 1 keep alive target capture regions • 1.6 m FD quadrupole spacing • Matching • In cryostat • 1.95 m FD quadrupole spacing • 6.9 m FD quadrupole spacing • 12.3 m FD quadrupole spacing • Transport line magnets: 13.5 km @ 400 MeV; 5.2 km @ 5 GeV • 8.4 m @ 400 MeV and 105 m @ 5 GeV FD quadrupole spacing • 4.4 m FD quadrupole spacing • Matching • References • http://www-project.slac.stanford.edu/ilc/acceldev/eplus/flies/Beamline%20Layout/ILC%20Positron%20Source%20Beam%20Optics.doc • http://www-project.slac.stanford.edu/ilc/acceldev/eplus/Documents/2006-05-18-Batygin-LTR.pdf FNAL, June 6, 2006

  4. e+ Transport Line Magnet Parameters Total 2275 FNAL, June 6, 2006

  5. 160 mm Bore 1662 Quadrupoles (1) Integrated field non-linearity at 20 mm radius 0.6% Flux density in the iron core. Pole end field < 1.47 T Field along Z-axis at 20 mm radius Field at 20 mm radius in central section FNAL, June 6, 2006

  6. 160 mm Bore 1662 Quadrupoles (2) Cooling pipes Laminated low carbon steel iron core (with pins or welded plates) Whole magnet cross-section stamping Four coils assembled with yoke and vacuum impregnated G10 spacers fix coils position Water cooling pipes attached to the yoke outer surface or each coil Drawings and specification preparation for quotation in progress FNAL, June 6, 2006

  7. Strings of Large bore quadrupoles Power Supply Quadrupoles Power supply 15 kW Voltage 220 V Current 62 A Current stability < 0.1% Power supplies number 400 Mev Line 33 5 GeV Line 3 Total PS 33 Total power 0.4 MW FNAL, June 6, 2006

  8. e+ Magnets Summary • All magnets are feasible • Some quadrupole effective length should be increased in 4 times • Large bore 1662 quadrupoles are 73 % of all magnets quantity, conceptually designed and will be correctly cost estimated • Integrated with quadrupole dipole correctors, strength 50 G-m ?, field 0.011 T , 1400 ampere-turns ? • Large bore solenoids heat loads ?, NC or SC? FNAL, June 6, 2006

  9. Damping Ring Dipoles FNAL, June 6, 2006

  10. Dipoles Magnetic Design Flux lines Yoke field 0.6 T Good field area +/-2units Field homogeneity at 30 mm radius FNAL, June 6, 2006

  11. Dipole Design FNAL, June 6, 2006

  12. Damping Ring Dipoles Summary • Window-frame laminated dipole magnets are feasible approach • The calculated field quality is in an agreement with spec. • Corrector magnet system needed to control operation • Because of low 0.16 T field in magnet air gap the remnant field and iron hysteresis effects should be investigated • The total power for all 260 dipoles is 3.9 MW • The cost optimization should be made to find the optimal relation between capital and operational expenses • The cost of kW-hour should be fixed for all areas • Beam-floor distance should be fixed to design supports FNAL, June 6, 2006

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