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Status of the MICE Diffuser

Status of the MICE Diffuser. V. Blackmore. A Brief Reminder. Purpose: Inflate beam emittance pre-cooling. Introduce 3 radiation lengths (variable) of material before the upstream Spectrometer Solenoid. Must operate in high field. No magnetic components (no electric motors or actuators).

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Status of the MICE Diffuser

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  1. Status of the MICE Diffuser V. Blackmore

  2. A Brief Reminder... • Purpose: Inflate beam emittance pre-cooling. • Introduce 3 radiation lengths (variable) of material before the upstream Spectrometer Solenoid. • Must operate in high field. • No magnetic components (no electric motors or actuators). Diffuser position relative to upstream Spectrometer Solenoid. 2/9

  3. Optical sensors (4) Actuators (4) General Description Irises (4) 3/9

  4. Prototype • Prototype cassette using stainless steel ‘petals’ to prove concept. • ~0.3 Nm torque to open/close • Lovely, smooth operation. 4/9

  5. Actuators • Need 4 pneumatic actuators: • 120 degree rotation, ~1 Nm @ 3 bar. • Non-magnetic actuators are not commercially available. • Made our own! • Works as expected, but ~1.5 bar of “stiction” to overcome. 5/9

  6. Testing • Brass irises opened/closed ~10k times without trouble. • But tungsten... 6/9

  7. * These are actually stainless steel, but the shape is still the same! Tungsten Petals • Complicated shape. • Tungsten is hard.... * • ...and brittle. • One thin tungsten petal broke at its weakest point after 8k actuations. 7/9 • Breaks easily.

  8. The Solution: • Brass is easy to machine and has proven it works. • Do the fiddly bits in brass, not tungsten. • Eliminates a weak point where the tungsten can break. • Fasten tungsten to brass “backing plate”. • So far so good. • Need more (machinable!) tungsten Existing tungsten petal retrofitted onto a 2mm brass backing plate. 8/9

  9. Status 9/9

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