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Towards the coating of 3 MBB dipoles Status report

Towards the coating of 3 MBB dipoles Status report. SPS-U. Coating t ests on MBB 096 with liner. Test #1 Liner 2 meters, 2 cathodes, 1 anode, sputtering power 400 W (limited by geometry and arcs at the extremities) Thickness non homogeneous SEY non homogeneous as a consequence. Test #1.

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Towards the coating of 3 MBB dipoles Status report

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  1. Towards the coating of 3 MBB dipolesStatus report SPS-U

  2. Coating tests on MBB 096 with liner • Test #1 • Liner 2 meters, 2 cathodes, 1 anode, sputtering power 400 W (limited by geometry and arcs at the extremities) • Thickness non homogeneous • SEY non homogeneous as a consequence Sergio Calatroni -17.02.2009

  3. Test #1 Sergio Calatroni -17.02.2009

  4. Test #1 Sergio Calatroni -17.02.2009

  5. Coating tests on MBB 096 with liner • Test #2 • Liner 2 meters, 2 cathode, 2 anodes, sputtering power 700 W • Max temperature on liner during coating 120 °C (specified for the vacuum chambers 150 °C at the sides, 300 °C on top) • More uniform dark colour • SEY: Sergio Calatroni -17.02.2009

  6. SEY for test #2 Sergio Calatroni -17.02.2009

  7. Under way • Test #3 • Liner 2 meters, 2 cathodes, 2 anodes • Better insulation of and shielding of feedthroughs and of cathodes extremities • Test for higher power sputtering and temperature limit. • Cleaning of MBB 085 and MBB 040 • Si-O-Si and HC were detected on all three dipoles before cleaning • Cleaning of MBB 096 was successful but not 100% conform to UHV specs • Modification of vacuum chambers • Piquages on MBB 096, 085, 040 done • Piquages to be done on MBB 51470 and QD 51510 in the tunnel (week 10, 2-6.3) • Studs for RF shields being welded on MBB 085, 040 (MBB 096 done) Sergio Calatroni -17.02.2009

  8. Coating plans • MBB 096 • Start assembly 19.2 • Coating • Dismount 24.2 (store under N2) • MBB 085 • Start assembly 24.2 • Coating • Dismount 27.2 (store under N2) • MBB 040 • Start assembly 27.2 • Coating • Dismount 4.3 (store under N2) • Last delivery date • Monday 9.3 Sergio Calatroni -17.02.2009

  9. Sample for C magnet, coated with a-C on 1.10.2008 Sergio Calatroni -17.02.2009

  10. Liners • Liner #1: inox • Liner #2: a-C coated from last year • We are still testing the Zr coating parameters for the liner #3 • Problems in temperature control for obtaining the right “rough” zirconium • Liner #4 to be defined • Installation schedule to be defined both for C-magnet sample and for liners Sergio Calatroni -17.02.2009

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