OVERVIEW OF ISIS ACCELERATOR VACUUM SYSTEMS AND THEIR VENTING

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OVERVIEW OF ISIS ACCELERATOR VACUUM SYSTEMS AND
THEIR VENTING

• By Shaun Hughes

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The ISIS Accelerator
The accelerator produces a beam of protons at an
energy of 800 MeV (84 speed of light) and pulsed
at 50 Hz. Average beam current is 200 ?A,
therefore 160 kW on target.
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Linac Vacuum System

• Total Volume
• 48000 Litres
• Operating Pressure
• 1x10-6 mbar
• Pumps
• 31 x 1,000 l/s TMP 4x 20,000 l/s Polycold
  Cryo-coils
• Valves
• Large DN250 Gate Valves
• Gauges Interlocks
• TPG300 controller interfaced to a PLC
• RGA
• Satellite based system each with faraday cup
  detector and radiation resistant cable

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Tank 2 Lid Liner Removed

• Reason for venting
• RF window failures
• Water leaks
• Air leaks
• HV insulator failure
• Tuner failures

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Synchrotron EPB

• High vacuum system built to UHV standards
• Built to be highly reliable, robust and be able
  to withstand high levels of radiation
• Large tapered flanges, clamps and seals
• Operating pressure
• Volume
• Pumps
• Valves
• 5 removable turbo/scroll roughing stations
• TPG300 gauging system, PLC for control and
  interlocks
• The RGA system

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Ring Vacuum Ion Pumps
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Removal of a Main Dipole Magnet

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Target Containment Vessel Vacuum System
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Beamline Vacuum Systems

• Muon Neutron Beamline Vacuum Systems
• Operating pressure
• Volume
• Construction material

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Merlin Vacuum System
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Merlin Vacuum system
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The ISIS Second Target Station
Experimental Hall, Target Station and 5
instruments by end 2008
Proton Beam by end 2007
Budget 140M
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SANS 2D Vacuum System
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Acknowledgements

• ISIS Vacuum Team
• S Hughes
• G Matthews
• D Stringer
• R Symes