Mercury Chamber Considerations V Graves IDSNF Target Studies

Mercury Chamber Considerations V. Graves IDS-NF Target Studies July 2011

Flow Loop Review • 1 cm dia nozzle, 20 m/s jet requires 1. 57 liter/sec mercury flow (94. 2 liter/min, 24. 9 gpm). • MERIT experiment showed that a pump discharge pressure of ~40 bar required to produce the desired jet. • Basic flow scheme Pump → Nozzle → Jet/Beam Dump → Heat Exchanger → Pump 2 Managed by UT-Battelle for the U. S. Department of Energy Mercury Chamber Considerations, July 2011

Hg Flow Overflow Mercury Drain • Minimize pressure drops through piping by increasing diameter – 2" nozzle supply piping transitioning to 1 cm nozzle Mercury Pump Gravity Drain Flow Control Valve Heat Exchanger Storage Tank 3 Managed by UT-Battelle for the U. S. Department of Energy Mercury Chamber Considerations, July 2011 Beam Dump

Gravity Drain Requires Flow Control • Bulk flow exits dump via overflow drains • Gravity drain intended to remain closed until end-of run, but this liquid becomes static • Decay heating requires gravity drain to have flow control 4 Managed by UT-Battelle for the U. S. Department of Energy Proton Beam Mercury Jet Gravity Drain Flow Control Mercury Chamber Considerations, July 2011 Mercury Overflow drains WC Shielding

Mercury Chamber Basics • Chamber serves as both jet and beam dumps – Chamber must encompass the nozzle tip • No openings into chamber during operation – Mercury flows in a closed loop – Likely will be double-walled for mercury containment, possibly water cooled • No embedded sensors • Gravity drain of mercury required • Penetrations (ports) into chamber – – – 5 Nozzle Hg drains (overflow and maintenance) Vents (in and out) Beam windows (upstream and downstream) Cooling? Managed by UT-Battelle for the U. S. Department of Energy Mercury Chamber Considerations, July 2011

Simple Chamber – Overflow Drain Options Drain Slots Drain Pipes • Splash mitigation not shown • Size of drainage system outlets TBD Drain Chamber 6 Managed by UT-Battelle for the U. S. Department of Energy Mercury Chamber Considerations, July 2011

Mercury Chamber Ports • Chamber requires several ports • Sizes likely to increase due to remote handling requirements Vents (In/Out) Jet Nozzle Beam Pipe Maintenance Drain (Valved) 7 Managed by UT-Battelle for the U. S. Department of Energy Overflow Drains Mercury Chamber Considerations, July 2011

Chamber Relative to Existing Coils • Sized to locate drain pipes below resistive magnets • No beam pipe shown • Severely impacts tungsten shielding • Chamber shape requires significant increase in complexity • Integrating resistive magnets and chamber into a single module likely to be required 8 Managed by UT-Battelle for the U. S. Department of Energy Mercury Chamber Considerations, July 2011

Upstream Solenoids Affect Design • Long piping required • Remote removal / insertion more difficult • Beam trajectory impacted – Dictates the location of upstream accelerator – Ramifications of inaccurate field map? • More utility connections interfere with beam path 9 Managed by UT-Battelle for the U. S. Department of Energy Mercury Chamber Considerations, July 2011