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LARP Collimator Engineering

LARP Collimator Engineering. E. Doyle 2/3/05. Review: SS Thermal Simulation. beam. 150mm OD 25mm wall Simply supported Heat: 1hr beam life, FLUKA results, 10x10x24 rectangular grid mapped to cyl I.D. water-cooled 20C h=11880 W/m^2/C No heat transport by water. Cu, 61C. support.

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LARP Collimator Engineering

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  1. LARP Collimator Engineering E. Doyle 2/3/05

  2. Review: SS Thermal Simulation beam • 150mm OD • 25mm wall • Simply supported • Heat: 1hr beam life, FLUKA results, 10x10x24 rectangular grid mapped to cyl • I.D. water-cooled 20C • h=11880 W/m^2/C • No heat transport by water Cu, 61C support dx=221 um support

  3. 12/2 meeting: ANSYS Simulation Results • Alternative alloys (Inconel, Invar, Al) yielded little or no improvement in distortion (assuming uniform cooling of ID) • Proposed that helical water flow might distribute heat to far side of bar, reducing distortion • New results • Helical water flow contributes to thermal distortion by cooling far side of jaw, increasing DT through the jaw • Preferable to cool beam side of jaw only, allow far side to heat up

  4. Simulation: Cooling limited to arc centered near beam allows far side of jaw to warm up. Peak temperature higher but distortion less. • For Cu cylinder, Steady State results: • TSS: 61C => 89C • d : 220um => 79um O.D. 45 deg arc – 195C, 111C beam I.D. SS initial condition

  5. 360o cooling of I.D. 45o cooling arc Note transverse gradient causes bending Note axial gradient 61C 89C Note more swelling than bending support dx=221 mm Spec: 25mm dx=79 mm support

  6. Mechanical distributor for directing coolant to axial channels

  7. Distributor & “Hard Wired” coolant channel concepts Free wheeling distributor – orientation controlled by gravity or external magnetic device – always directs flow to beam-side axial channels whatever the orientation of the rotor. Six or more discrete axial flow paths. Individual flexible supply tubes. One or more may be activated for a given rotor orientation. Flow control valves external to vacuum chamber.

  8. Alternative distortion control • Machine jaw with slightly concave hourglass shape. Thermal distortion => flat • Divide jaw lengthwise in two independent sections (distortion proportional to L2) • Heat far side of jaw (feedback control?) to minimize DT • Custom alloy combining low-Z high conductivity with high-Z material

  9. Designer Alloy Concept • Low-Z, high conductivity material matrix with distributed high-Z material • Cu in Be or Al • Be is powder metallurgy product. Any ratio is possible. • 2219 Al: standard alloy with 6% Cu content. • Investigating higher Cu content alloys Notes: 1. Pure Al 2. 6% Cu

  10. 2219 Al, cooled on 45o arc of ID beam • 1 hr beam life SS • 4.6 kW heat absorbed • More swelling than bending 42.7C dx=30.6 mm

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