1 / 9

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).

fynn
Download Presentation

Status of the MICE Diffuser

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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

More Related