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PS complex and septa overview

PS complex and septa overview. Jan Borburgh AB-BT-Septa section leader. Vacuum: typically 10 -9 mbar range, for LEIR and AD <10 -12 and <10 -10 mbar respectively Magnetic septa currents: from 7 to 40 kA for pulsed septa, up to 2.8 kA for DC septa outside vacuum

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PS complex and septa overview

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  1. PS complex and septa overview Jan Borburgh AB-BT-Septa section leader

  2. Vacuum: typically 10-9 mbar range, for LEIR and AD <10-12 and <10-10 mbar respectively Magnetic septa currents: from 7 to 40 kA for pulsed septa, up to 2.8 kA for DC septa outside vacuum Electrostatic septa electric fields: up to 11 MV/m, cathode lengths from 720 mm up to 3 m PS complex and septa overview CERN Septa operating parameters

  3. AB/BT equipment in PS complex PS complex and septa overview ISOLDE East Hall AD PSB PS cv CTF3 LINACs LEIR PS Complex Ions for LHC Project 17 magnetic septa 3 magnetic septa 1 electrostatic septum 2 electrostatic septa

  4. PS complex and septa overview Electrostatic septa LEIR electrostatic septum (diagonal deflection)

  5. PS complex and septa overview Under vacuum magnetic septa Under vacuum infra-red bake out lamps Stack of 4 booster extraction septa with the flexible strip line

  6. PS complex and septa overview Septum exchange Septum installed in the PS ring Aligned chassis before plug-in (PS septum 31) installation

  7. PS complex and septa overview Radiation levels in the PS complex

  8. Relative easy exchange of equipment in case of failure (plug in units) Initial alignment with surveyors, no realignment in case of an exchange Quick disconnect vacuum flanges to speed up installation in accelerator Use of ‘radiation hard’ materials as much as possible Minimize maintenance needs due to elastic construction and fixation of coils for pulsed septa Still tri-monthly exchange of insulation fluid of High Voltage feedthrough of electrostatic septa in PS ring Programmed exchange of electrostatic septa Manual installation of flexible strip line connection for pulsed magnetic septa Manual quick disconnecting cooling water supply Permanent installation of bake out system, except the for the regulation electronics PS complex and septa overview Design constraints due to maintenance of radioactive equipment

  9. SPS Septa maintenance and radiation related issues Bruno Balhan SPS extraction activities coordination

  10. SPS Septa maintenance and radiation related issues CERN Accelerator Complex Extractions for the SPS West Extraction (LSS6) North Extraction (LSS2) East Extraction (LSS4) 6 Magnetic Septa (MSE) 5 Electrostatic Septa (ZS) 5 Electrostatic Septa (ZS) 3 Magnetic Septa Thin (MST) 3 Magnetic Septa Thin (MST) 5 Magnetic Septa (MSE) 5 Magnetic Septa (MSE)

  11. SPS Septa maintenance and radiation related issues Radiation Measurement in Extraction Areas. Monitors implantation in the west extraction channel. Radiation probes are installed close to the equipment. Radiation evolution on the monitor PMIU603 (mSv).

  12. SPS Septa maintenance and radiation related issues Radiation levels for SPS extraction channels.North Extraction Dose Rate at about one meter after 30h of cool down. These measurements are taken around the entire SPS ring after every run.

  13. Planned exchange/replacement guidelines in order to avoid interventions during runs (H.V cables, water filters, …) Remove and store equipments for long interventions, especially during replacement of radiation damaged cables (~every 5years) Monitoring of critical parameters to assure correct operation and septa lifetime ( Spark rate, faults, beam losses, water quality, …) Use portable remote camera for interventions (motor calibration) Bunker for refurbishment and spreading of dose taken over several people (equipment specialists perform only expert tasks) SPS Septa maintenance and radiation related issues Maintenance and Intervention on SPS septa.

  14. Diagnostics, five electrostatic septa in the same vacuum sector Intervention planning with people involved (physics coordinator, equipment experts, safety coordinator, radiation protection service, vacuum and transport services) Intervention preparation (actions, detailed radiation dose planning, spares,) Wait for radiation cool down and exact measurement before access Vacuum venting with dry N2 on equipment concerned Remove damaged HV feedthrough under constant N2 flow SPS Septa maintenance and radiation related issues H.V. feedthrough replacement

  15. Install “pre-conditioned” feedthrough (baked, HV tested, vacuum stored) Installation of mobile vacuum pumping groups Pumping, leak detection and removal of pumping equipment HV conditioning of equipment when correct vacuum level is obtained Hand over the equipment in “good shape” to the main control room Intervention analyses with involved people to improve/update procedure SPS Septa maintenance and radiation related issues H.V. feedthrough replacement

  16. Design issues of the SPS Magnetic Septa in LSS4 Wim Weterings LSS4 Project engineer

  17. AB/BT equipment in PS complex Design issues of the SPS Magnetic Septa in LSS4 Main Design Issues Quick disconnect Preventive maintenance Radiation hard materials Accessibility of components Pre-alignment & Plug-in installation

  18. AB/BT equipment in PS complex Design issues of the SPS Magnetic Septa in LSS4 MSE septum magnet parameter

  19. AB/BT equipment in PS complex Design issues of the SPS Magnetic Septa in LSS4 MSE Magnet Magnet Cooling System Power and Cooling Feedthrough Plug-In System

  20. Design issues of the SPS Magnetic Septa in LSS4 Dummy Septum structure for alignment purpose in clean-room & SPS tunnel

  21. AB/BT equipment in PS complex Fast extraction channel in LSS4 – Extraction Septum MSE Magnet Pre-aligned Pumping Module Support Feet Control Cabling Patch Panel Magnet support feet

  22. AB/BT equipment in PS complex Design issues of the SPS Magnetic Septa in LSS4 Vacuum Pumping Module Pre-aligned support feet

  23. Design issues of the SPS Magnetic Septa in LSS4 Control Cabling Patch Panel Unique Control & Bake-out Connection Girder Motorization Local Cabling (periodically preventive replacement) Further documentation: AB-Note-2003-027-BT SL-Note-2002-014-BT http://sl.web.cern.ch/SL/BTGroup/EXsection/LSS4/LSS4.htm

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