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Status Report on the Design of Various Beam Delivery Magnets

Status Report on the Design of Various Beam Delivery Magnets. Cherrill Spencer, SLAC 23rd May 2006 At the ILC Magnet Systems Group Meeting, FNAL. Names of various lines in BDS. 20 mrad IR. EBSD. PBSYD. PBSD1. PBDS2. EBDS1. EBDS2. PDL1, PFF1, PIRT1, PBSY2, PBSY1.

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Status Report on the Design of Various Beam Delivery Magnets

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  1. Status Report on the Design of Various Beam Delivery Magnets Cherrill Spencer, SLAC 23rd May 2006 At the ILC Magnet Systems Group Meeting, FNAL Cherrill Spencer, BDS Magnet Status Report

  2. Names of various lines in BDS 20 mrad IR EBSD PBSYD PBSD1 PBDS2 EBDS1 EBDS2 PDL1, PFF1, PIRT1, PBSY2, PBSY1 EBSY1, EBSY2, EIRT1, EFF1, EDL1 PDL2, PFF2, PIRT2 EIRT2, EFF2, EDL2 e+ e- 2 mrad IR Cherrill Spencer, BDS Magnet Status Report

  3. Overview of Beam Delivery System Magnets • Has 1352 magnets of ~ 53 styles • Most styles of any area • Presently 23 styles of quads • Will try to consolidate styles as I go along • Doing preliminary designs of some “regular” looking quads; low field dipoles; dump line magnets-present goal: give magnet sizes, power+LCW requirements to Conventional Facilities: will show today • Although magnet specs given at 250GeV/beam need to design all BDS magnets for 500GeV/beam Cherrill Spencer, BDS Magnet Status Report

  4. Official BDS “parts list” lists basic parameters for magnets-sample of dump line list after 2mr IP Cherrill Spencer, BDS Magnet Status Report

  5. 1st draft design for one of the “regular” quads, used in various BDS beamlines Bore radius : 1.0cm Effective length 2m B (poletip) range: 0.0819-2.5082Kg at 250GeV/beam Need to increase bore to leave room for beampipe & heater tapes-> 1.3cm Revised B(pt)= 6.52Kg Model 1/8th magnet in POISSON C1010 core COIL Cherrill Spencer, BDS Magnet Status Report

  6. POISSON predictions Choose medium cond, 10 turns I=337.3 amps. Choose enough C1010 steel to have 98.8% efficiency. Core is 198.7cm long Weight ~ 950 Kg LCW: 8 circuits per mag at 180 Delta psi 3.1gpm per quad 10.3Kg 13.5Kg 6.3Kg 13.75cm Cherrill Spencer, BDS Magnet Status Report

  7. Idea for the low field dipoles in final focus beamlines • In order to minimize synchrotron radiation all the dipoles in FF are very long with very low fields in gap • 12 m eff length, gap range 5-292 gauss covering beams from 45 GeV to 500 GeV • Gap in parts list = 6cm, increase to 6.6cm to leave room for beampipe & heater tape • Divide into 6 dipoles each 2m effective length Cherrill Spencer, BDS Magnet Status Report

  8. AVAILABLE SPACE NEAR 2MR IPUnits are meters. RED lines are photons to be avoided Cherrill Spencer, BDS Magnet Status Report

  9. Regular H shaped dipole with solid low carbon steel core & solid Cu wire #9AWG square C1010 steel core 100 turns coil Aperture Overall width23.5 cm POISSON model :top RH quarter of dipole. 6cm full gap. 14cm wide poletip Cherrill Spencer, BDS Magnet Status Report

  10. Regular H shaped dipole with solid low carbon steel core & solid Cu wire #9AWG square:details • Would be used for B1,B2 and B2DPA/B/3 dipoles • Range of gap field : 5- 292 gauss for 45-500 GeV beams • These magnets have 12m effective lengths. Would divide each one up into six 2 meter long dipoles • Using 100 turns of #9 AWG square Cu wire, magnet resis = 2.49 ohms (AIR COOLED) • To reach 292 gauss need ~700 amp-turns: 7 amps • For BS1 dipoles at 3.08 amps: Voltage= 6.30 V per 2m long dipole. • For 180 (=30x6) strung dipoles : 180x6.30 =1134volt • Keep PS voltage < 600 v in general, so use 2 7 amp, 600 volt PS • Cable: #12 awg, 1000ft = 2.5 ohm, so enough voltage left for cables Cherrill Spencer, BDS Magnet Status Report

  11. Design quads in dump line near 2mrad IPUnits are meters. RED lines are photons to be avoided Cherrill Spencer, BDS Magnet Status Report

  12. POISSON model for “QEX4” 2mr extraction line quad 58.45cm between dumped beam & edge of B1 For 500 GeV beam need poletip field of 14.8361Kg !! C1004 solid steel core 20cm radius aperture 3cm space Coil Adjacent B1 dipole Photons from IP, fill this circle Cherrill Spencer, BDS Magnet Status Report

  13. POISSON model results for 118061 amp turns- with perfect steel would give 14.84Kg at poletip 9.2 POISSON predicts 10.27 Kg at poletip. Steel totally saturated in much of the core. 17.3 10.5 17.6 24 25.6 25.7 Cherrill Spencer, BDS Magnet Status Report

  14. Make wider sideleg, 14cm wide- interferes with about 5 cm of adjacent soft bend B1 Pole tip field increases to 12.97Kg ( POISSON model NOT converged) Cherrill Spencer, BDS Magnet Status Report

  15. How to proceed? • Run with enough ampturns to produce the 250GeV/beam poletip field • Still very saturated and only ~90% efficient. • Needs 66268 ampturns/pole • Side leg flux density~22.1Kgauss • Expect fringe field overlapping with adjacent B1 • Will look at a “Panofsky” style quad Cherrill Spencer, BDS Magnet Status Report

  16. “Turtle” tracking generates profile of beam in X & Y Cherrill Spencer, BDS Magnet Status Report

  17. Top half of a “double” Panofsky quad: idea for QEXF1: to deal with short distance between beam centers Cherrill Spencer, ILC@SLAC Preliminary model, checking for feasibility 109mm between 2 beams Top halves of side coils Top coil Steel core Steel core Main aperture 25.4mm Aperture for incoming beam 166mm Extracted beam, plus photons, determine shape of main aperture Cherrill Spencer, BDS Magnet Status Report Incoming beam, very small spot

  18. POISSON prediction for double Panofsky quadflux lines for top half of quad QEXF1 Cherrill Spencer, ILC@SLAC Field values need to be checked by particle tracking Fields in low carbon steel core range from 0.5 to 8kG Ampturns in half side coil = 14,568 Field at incoming beam = 14.9 gauss Quadrupole field in main aperture, gradient = 7.2849 T/m Cherrill Spencer, BDS Magnet Status Report

  19. Cherrill Spencer, BDS Magnet Status Report

  20. Issues regarding strung power supplies and getting repeatable strengths at very low fields • For B1 dipoles, nom field= 25 gauss at 250GeV • At 500 GeV/beam need 50 gauss. • Current for 50 gauss= 1.19 amps • Voltage for one 2 m dipole = 2.97 V • Need to string 36 dipoles on one PS (=6B1s x 6 parts each) • This string would need 6x6x2.97V= 107 volts. • Running at 45 GeV/beam need 14 amp-turns= 0.14 amps! • Would need to interleave dipoles on various PS and turn some off to reach very low integrated strengths. Question to Andrei: jitter issue? • Experience at SLC with v.low field dipole shows that can be repeatably set with 10(-4) precision- needs degaussing w/ bipolar PS and carefully followed standardization procedure . (Will write memo on SLC data another day) Cherrill Spencer, BDS Magnet Status Report

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