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Stephan Russenschuck, CERN-AT-MEL

Progress Report from the Magnet Polarity Coordinator. Stephan Russenschuck CERN AT-MEL-EM 1211 Geneva 23. Stephan Russenschuck, CERN-AT-MEL. 1. Instead of an Overview. Share with me.  The confusion about the Magnet Polarity Conventions.

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Stephan Russenschuck, CERN-AT-MEL

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  1. Progress Report from the Magnet Polarity Coordinator Stephan Russenschuck CERN AT-MEL-EM 1211 Geneva 23 Stephan Russenschuck, CERN-AT-MEL 1

  2. Instead of an Overview Share with me  The confusion about the Magnet Polarity Conventions.  The doubts about the Polarity of the Main Quadrupole.  The worries about the continuity of the Spool-piece Busbars. Stephan Russenschuck, CERN-AT-MEL  The passion for the following question: 9:00 or 3:00? 2

  3. LHC Magnet Polarities EDMS: 90042 Stephan Russenschuck, CERN-AT-MEL 3

  4. Polarity Conventions Θ Center of machine (Convention) Stephan Russenschuck, CERN-AT-MEL Θ Convention: Beam 1 Convention: Looking downstream of Beam 1 4

  5. MAD Frame Positive Dipole Θ Stephan Russenschuck, CERN-AT-MEL Θ Positive Quadrupole Focusing Proton Beam on the Horizontal Plane 5

  6. LHC Magnet Polarities EDMS: 90042 Stephan Russenschuck, CERN-AT-MEL mad mad 6

  7. Dipole in MAD and MAG Frame Θ B2mad= - B2mag DKN(.,0,0,0) = B1mad= B1mag Stephan Russenschuck, CERN-AT-MEL Θ 7

  8. Page 5 of EDMS 90042 Document mad mad Stephan Russenschuck, CERN-AT-MEL 8

  9. Skew Dipole and Quadrupole in Both Frames B1mag→ A1mag B2mag→ A2mag Θ Θ A1mad= A1mag A2mad = - A2mag Stephan Russenschuck, CERN-AT-MEL Θ Θ B2mad→ A2mad B1mad→ A1mad 9

  10. Skew Dipole and Quadrupole in Both Frames B1mag→ A1mag B2mag→ A2mag Θ Θ - A1mad= A1mag - A2mad = - A2mag Stephan Russenschuck, CERN-AT-MEL Θ Θ + B2mad→ - A2mad B1mad→ - A1mad 10

  11. Page 5 of EDMS 90042 Document mad mad - - Stephan Russenschuck, CERN-AT-MEL 11

  12. LHC Magnet Polarities EDMS: 90042 Stephan Russenschuck, CERN-AT-MEL Dipole Quadrupole 12

  13. Conversion Table: Dipoles (and B3, B5, ..) MAD H Kicker V Kicker B1 B1 A1 A1 tilt tilt clockwise clockwise Deflecting out up in down up in Beam 1 EDMS Negative Negative Positive Positive Negative Positive Stephan Russenschuck, CERN-AT-MEL 90042 dipole skew dipole skew skew dipole (Polarity) dipole dipole dipole Meas. - B1 -A1 B1 A1 -A1 B1 Mag. Frame 13

  14. Conversion Table: Quadrupoles (and B4, B6, …) MAD B2 B2 A2 A2 tilt tilt clockwise clockwise Focusing Q1 + Q1 - Focusing in horizontal Q2 - Q2 + in horizontal plane plane EDMS Positive Positive Negative Positivite Stephan Russenschuck, CERN-AT-MEL 90042 Quadrupole skew skew quadrupole (Polarity) quadrupole quadrupole Meas. - B2 - A2 A2 - B2 Mag. Frame 14

  15. MAD Conventions for the Double Ring Measured in Beam 1 in outer ring + + + + + + + + Beam 1 in inner ring + - + - - + - + Current into A Current into B Aperture 1 Ap. 1 Ap. 2 Ap.1 Ap. 2 B1 b2 b3 b4 a1 a2 a3 a4 + + + + + + + + B1 B2 B3 B4 A1 A2 A3 A4 B1 b2 b3 b4 a1 a2 a3 a4 + - + + - + - + - + + - + + + + - - + + - + - + + + + - + + + + Stephan Russenschuck, CERN-AT-MEL How to parse this chart: Whatever the powering of the main dipole, the relative b2 is always measured negative in Ap.1. A negative b2 gives +B2 (focusing in the h-plane) in MAD for beam 1 in the inner ring (Ap. 2), sectors 2-3, 3-4, 4-5, 8-1. In these sectors the current enters terminal B of the dipole magnet. This creates a +B2 in Ap2. A sign reversal of b2 is needed. 15

  16. Dipole Busbar Routing (LHC-DCB-ES-0001) Stephan Russenschuck, CERN-AT-MEL 16

  17. LHCMQ_DS0020 P4fl (A Terminal) Stephan Russenschuck, CERN-AT-MEL P4fl (A Terminal) 17

  18. LHCMQ_ DS0021 (LHCMQ__S0018) P4FL (A Terminal) Stephan Russenschuck, CERN-AT-MEL P1FL (A Terminal) 18

  19. LHCDCQAA0002 Stephan Russenschuck, CERN-AT-MEL 19

  20. LHCLQMBP0002 (Version VAB 18.06.98 Approved) Stephan Russenschuck, CERN-AT-MEL Wrong polarity 20

  21. LHCLQM_S0004 (Production Drawing 2002) o.k. Stephan Russenschuck, CERN-AT-MEL 21

  22. LQMTK (F Busbar, Diode-Type A) Stephan Russenschuck, CERN-AT-MEL 22

  23. Concern: Spool-piece Busbar Routing Stephan Russenschuck, CERN-AT-MEL 23

  24. Spool-piece Busbar Routing in the SSS Stephan Russenschuck, CERN-AT-MEL 24

  25. Continuity Testing of Spool Piece Busbars From: Budinger [mailto:ralf.budinger@accel-ssl.com] Sent: jeudi, 19. août 2004 07:07 To: schirm karl (E-Mail) Cc: BurgmerRolf (E-Mail); Schellong Bernd (E-Mail) Subject: Busbar Hallo Hr Schirm, nur kurz zusammengefasst: Beim Testen der Busbars gestern waren an Set 111 die spool 2+3 vertauscht und an Set 105 die spools 11+12, sowie 16+17 gegeneinander vertauscht. Stephan Russenschuck, CERN-AT-MEL mfg Ralf Budinger Three labeling or cross-over errors in a batch of 10 tested SSS busbar sets 25

  26. Continuity Checker Stephan Russenschuck, CERN-AT-MEL 26

  27. Instead of a Conclusion: Mandate of the Magnet Polarity Coordinator To ensure the coherence in the definition of the magnet polarities among MAD input files, the LHC reference database, field computations, field measurements, interconnection works and the powering of electrical circuits.  To define the base-line for the verification of magnet polarities from magnet production to powering in the machine.  To establish, in consultation with the project engineers and magnet coordinators the rules and templates for the documentation and treatment of powering non-conformities.  Stephan Russenschuck, CERN-AT-MEL To gather and re-distribute relevant documentation. To ensure adequate flow of information and filtering of MTF data for the electrical quality assurance in the tunnel.  27

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