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Overview of Phobos Magnet

Overview of Phobos Magnet system including design specifications, components, power supply details, testing procedures, cooling system specifics, mechanical support, and safety measures.

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Overview of Phobos Magnet

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  1. Overview of Phobos Magnet • Designed by Harald Enge • Built by Danfysik • Technical summary: • “Double dipole” design • 15.5 cm air gap • Max. 2 Tesla field • 378 kW power dissipation • High, uniform field inside gap • Small field outside gap • Phobos Magnet is a conventional magnet

  2. Position of Magnet System Components M CT 10 o’clock hall PS

  3. Position of Magnet in Hall Outer Ring Wall

  4. 4040mm Major Dimensions in Side View 1950mm 155mm 843mm 1170 kN 300mm Floor 20 kN force

  5. Major Dimensions in Top View 4040mm 1400mm 430mm

  6. Weights of the Components

  7. Field in the Spectrometer

  8. Stray Field Inner Wall Outer Wall

  9. Jacks • Magnet will be supported by 4 Jacks • Jack Type Duff Norton M9015: • 15 ton max load • 12” Stroke • 2 opposite jacks have a common drive shaft

  10. Electrical Path Distribution Box Power Supply Coil Coil Berm penetration Coil Coil 150’ Cooled Buss

  11. Power Supply • Refurbished AGS power supply: • Acme Rectifier, type PS-59005 • Input: 440 VAC; 682 A; 60 Hz • Output taps: 75V, 88V, 105V and 125V • Phobos will use the 105V tap with 3600A current • Internal Power Dissipation: 40 kW • air-cooled

  12. Coils • Coil consists of: • 8 double pancakes with 6 turns per pancake • Square OFHC Cu-conductor 0.650” on a side and a 0.363” diameter cooling hole • Vacuum epoxy impregnation • Pancakes electrically connected in series, hydraulicly in parallel. • Power dissipated per coil is 85.4 kW • 2 Coils are connected in series: • total 95V drop at 1800A

  13. Connections at Coil Power In Klixon Double Pancake Flow K K K K 8 parallel H2O circuits K K K K Power Out

  14. Coil Tests • Danfysik will perform the following tests on the coils: • Pre-impregnation tests: • Obstruction of coolant flow test • Test of turn-to-turn insulation • Test of leakage under pressure (up to 360 psig) • Post-impregnation tests: • Test of coil-to-earth insulation at 2000 VDC (leakage current less than 20 microA). • Test of turn-to-turn insulation • Coil resistance • Water flow • Water temperature rise at 600A

  15. Cooling • Cooling Tower capacity of 0.5 MW • A water flow at pressure differential 60 PSI at inlet temperature 45ºC permits operation at full power (378 kW) • Flow rate of 11 liters/min and temp. rise of 14ºC per pancake • Total water flow through magnet: 352 liters/min • 12.5 kW are dissipated in cooled buss • Monitoring: • Temp. rise: Auto-reset Klixons set at 70ºC • Water flow: Paddle Flow meters

  16. Cooling Water Path Distribution Box Cooling Tower Pump Coil Coil Berm penetration Coil Coil

  17. Manifolding Side View Distribution Box Outer Wall

  18. Manifolding Top View Manifolds Outer Wall

  19. Mechanical Support • Flux steel designed to deflect less than 1mm at full field strength • this design requirement is far from any safety margins • Any one vertical support can withstand static plus magnetic load of yoke • Magnet is stable: • 17º tilt angle required • tilting requires 140 kN transverse force Magnet is “over-designed”

  20. Interlocks Flow K 4 Flow meters K Flow 4x8 Klixons ... K Trips PS PLC ... Shuts off Water Pump Water mats ...

  21. Conclusion • Standard normal coil magnet • No unusual hazards • Design by Enge • Mechanical design is deflection limited • Built by Danfysik • Installed under BNL supervision • We see no particular safety problems

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