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Exploring Hexabundles: Enhancements for the OzPoz Positioner at the University of Sydney

Join us for the AAO workshop on November 24, 2008, at the University of Sydney, where we delve into innovative techniques for integrating hexabundle fibre optics with the existing OzPoz positioner. We will discuss current challenges with mini-IFUs and FACBs, including flexibility and retraction systems, and explore potential modifications to accommodate larger 61-core bundles. Strategies to maintain fibre integrity and performance while enhancing robot interactions will be a key focus. Engage in discussions about the feasibility of these advancements in optical designs.

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Exploring Hexabundles: Enhancements for the OzPoz Positioner at the University of Sydney

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Presentation Transcript

  1. Hexabundles meet OzPoz Andrew McGrath, AAO Hexabundle science workshop University of Sydney 24th November 2008

  2. OzPoz – the FLAMES positioner

  3. Buttons • Existing OzPoz has single-fibre buttons and mini-IFUs with 20 fibres each • Mini-IFUs view 2x3 arcsec FoV • FACBs (acquisition bundles) with 19 fibres • Common button package

  4. Bundles • Single-fibre buttons fed with sleeved fibre • 19- and 20-fibre bundles also carried in slightly larger diameter sleeve

  5. Buttons

  6. Retractor • Take up slack in fibre • Keep mild tension in fibre to button (~1 N) • Diameter of bundle • Bend radius ~24 mm • Flexibility

  7. Retractor • Take up slack in fibre • Keep mild tension in fibre to button (~0.1N)

  8. Magnetic attachment • Buttons secured magnetically to field plate • Strong enough – Static friction must hold button stable to ~1 N retractor tension, in arbitrary orientation wrt gravity • Not too strong – Robot gripper limits to ~4 N • Clamping force ~2.5 N

  9. Bundle handling experience • Works well for existing design • No evidence of effects of ‘tangling’ of fibres against each other within 19- and 20-fibre sleeved bundles • 2dF retractors carry unsleeved bundles of fibres for guide bundles

  10. FLAMEing Hexabundles? • Can we use the existing arrangement to fit one or more 61-core hexabundle fibre bundles to OzPoz? • Notionally, assemble a FACB or mini-IFU button with a hexabundle feed • Seems OK

  11. FLAMEing Hexabundles? • Can the existing OzPoz retractor accommodate a bundle of 61 fibres? • Currently handles 20 • Diameter of bundle will increase • Stiffness of sleeved bundle will increase

  12. FLAMEing Hexabundles? • Need to identify a suitable sleeve • Could increase retractor spring force to accommodate increased stiffness • Flow-on effects to magnetic force and robot force capacity could render unfeasible

  13. FLAMEing Hexabundles? • Could subdivide the bundle to manageable subsets • Multiple adjacent retractors per button • Minor additional placement limitations • Probable requirement for increased magnetic force to provide static friction • Robot flow-on effects may render unfeasible

  14. FLAMEing Hexabundles? • Unsleeved bundle likely much more flexible • Similar arrangement to 2dF, fibres in a loose plait • Tangling issues and fibre breakage are important concerns

  15. FLAMEing Hexabundles? • Or… consider FLAMEing Hexabundles as a one-off type of test • Don’t run the fibre bundle through a retractor at all • Manually place the button on the field plate • Use the robot for metrology only • Tweak the button(s) into place by tapping with a finger

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