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MICE Diffuser V Update: Enhancements for Beam Emittance and Operational Efficiency

This brief summary outlines the status of the MICE Diffuser V project, aimed at improving beam emittance pre-cooling. Key developments include the introduction of variable radiation lengths of materials before the upstream Spectrometer Solenoid, designed to operate under high magnetic fields without electric motors or actuators. The prototype utilizes stainless steel petals to validate the design and perform well with ~0.3 Nm torque. Challenges such as stiction and brittle tungsten components have led to the implementation of brass solutions to enhance durability and manufacturability.

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MICE Diffuser V Update: Enhancements for Beam Emittance and Operational Efficiency

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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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