Download - PS complex and septa overview
AB/BT Septa presentation for KEK visitors 22/9/2004
PS complex and septa overview
Jan Borburgh
AB-BT-Septa section leader
AB/BT Septa presentation for KEK visitors 22/9/2004
CERN Septa operating parameters• 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
AB/BT Septa presentation for KEK visitors 22/9/2004
PS
PSB
AD
LINACs
CTF3
LEIR
ISOLDE
cv
East Hall
AB/BT equipment in PS complex
17 magnetic septa
2 electrostatic septa
3 magnetic septa
1 electrostatic septum
Ions for LHC ProjectPS Complex
PS complex and septa overview
AB/BT Septa presentation for KEK visitors 22/9/2004
Electrostatic septa
LEIR electrostatic septum (diagonal deflection)
PS complex and septa overview
AB/BT Septa presentation for KEK visitors 22/9/2004
Under vacuum magnetic septa
Stack of 4 booster extraction septa with the flexible strip line
Under vacuum infra-red bake out lamps
PS complex and septa overview
AB/BT Septa presentation for KEK visitors 22/9/2004
Septum exchange
Aligned chassis before plug-in (PS septum 31) installation
Septum installed in the PS ring
PS complex and septa overview
AB/BT Septa presentation for KEK visitors 22/9/2004
Radiation levels in the PS complexPS ring radiation dose rate after 32 hrs (2002)
1
10
100
1000
10000
uS
v/h
upstream
downstream
PS complex and septa overview
AB/BT Septa presentation for KEK visitors 22/9/2004
Design constraints due to maintenance of radioactive equipment
• 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
AB/BT Septa presentation for KEK visitors 22/9/2004
SPS Septa maintenance and radiation related issues
Bruno Balhan
SPS extraction activities coordination
AB/BT Septa presentation for KEK visitors 22/9/2004
5 Magnetic Septa (MSE)
5 Electrostatic Septa (ZS)
Extractions for the SPS
3 Magnetic Septa Thin (MST)
West Extraction (LSS6)
5 Magnetic Septa (MSE)
5 Electrostatic Septa (ZS)3 Magnetic Septa Thin (MST)
North Extraction (LSS2)
6 Magnetic Septa (MSE)
East Extraction (LSS4)
CERN Accelerator ComplexSPS Septa maintenance and radiation related issues
AB/BT Septa presentation for KEK visitors 22/9/2004
Radiation Measurement in Extraction Areas.
Radiation evolution on the monitor PMIU603 (mSv).
Monitors implantation in the west extraction channel.
Radiation probes are installed close to the equipment.
SPS Septa maintenance and radiation related issues
AB/BT Septa presentation for KEK visitors 22/9/2004
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.
SPS Septa maintenance and radiation related issues
AB/BT Septa presentation for KEK visitors 22/9/2004
Maintenance and Intervention on SPS septa.
• 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
AB/BT Septa presentation for KEK visitors 22/9/2004
H.V. feedthrough replacement
• 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
AB/BT Septa presentation for KEK visitors 22/9/2004
H.V. feedthrough replacement
• 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
AB/BT Septa presentation for KEK visitors 22/9/2004
Design issues of the SPS Magnetic Septa in LSS4
Wim Weterings
LSS4 Project engineer
AB/BT Septa presentation for KEK visitors 22/9/2004
AB/BT equipment in PS complexDesign issues of the SPS Magnetic Septa in LSS4
Main Design Issues
Quick disconnectPreventive maintenanceRadiation hard materials
Accessibility of componentsPre-alignment & Plug-in installation
AB/BT Septa presentation for KEK visitors 22/9/2004
Vacuum tank
Support structure
Bake-out system
RF Shielding
Support girder
Adjustable jack Ball bearingBus-Bar system
Motorization
Cooling circuit
Plug-in system
Contact elements
Personel protection cover Power feedthrough
Alignment target
Septum coil
Laminated yoke
Adjustable support feet
AB/BT equipment in PS complex
MSE septum magnet parameter
Septum thickness mm 17.25
Gap height mm 20
Maximum field T 1.508
Kick at 450 GeV/c mrad 2.249
Magnetic length m 2.237
B.dl max Tm 3.373
Peak current A 24,000
B.dl / I Tm/A 1.41 10-4
Total resistance m 3.48
Total inductance mH 84
Peak voltage V 80
Minimum rise/fall time ms 200
Magnet spacing mm 3,234
Design issues of the SPS Magnetic Septa in LSS4
AB/BT Septa presentation for KEK visitors 22/9/2004
AB/BT equipment in PS complex
MSE Magnet
Plug-In System
Magnet Cooling System
Power and Cooling Feedthrough
Design issues of the SPS Magnetic Septa in LSS4
AB/BT Septa presentation for KEK visitors 22/9/2004
Design issues of the SPS Magnetic Septa in LSS4
Dummy Septum structure for alignment
purpose in clean-room & SPS tunnel
AB/BT Septa presentation for KEK visitors 22/9/2004
AB/BT equipment in PS complexFast extraction channel in LSS4 – Extraction Septum
MSE Magnet
Pre-aligned Pumping Module
Support Feet
Magnet support feet
Control Cabling
Patch Panel
AB/BT Septa presentation for KEK visitors 22/9/2004
AB/BT equipment in PS complex
Pre-aligned support feet
Vacuum Pumping Module
Design issues of the SPS Magnetic Septa in LSS4
AB/BT Septa presentation for KEK visitors 22/9/2004
Unique Control & Bake-out
Connection
Control Cabling
Patch Panel
Girder Motorization
Local Cabling (periodically preventive
replacement)
Further documentation:AB-Note-2003-027-BTSL-Note-2002-014-BT http://sl.web.cern.ch/SL/BTGroup/EXsection/LSS4/LSS4.htm
Design issues of the SPS Magnetic Septa in LSS4