Notes from Apr 21 Whiteboard session 1 Robin Lafever Thursday afternoon, 21 Apr We convened around a Whiteboard to try to integrate the spectrum of ideas about what is happening at the “Top End”, around the Focal Plane. This my sketch of the sketch on the Whiteboard As we summarized our session. In attendence: Robin Henry Jerry Pat With comments, peek-ins, or weird looks from: Bobby Chris Matt My apologies to anyone I left out. 10/25/2015

2 Robin Lafever To summarize: A fiber cable assembly currently has these dimensions And the Corrector assembly has these black boxes attached to it somewhere Notes from Apr 21 Whiteboard session X 10 10/25/2015

3 Robin Lafever Here’s our list of utilities that need to find a place on the corrector assembly……. Fiber Cable Breakout box X 10 Vacuum distribution Illuminator/Tracker/Focus Box Hexapod Box ADC Box FiberView Camera Power Notes from Apr 21 Whiteboard session …resulting in a list of the cables that go from the corrector, through the telescope and into the spectro room. Utility cross-section (Guess) Vacuum 25mm width max Fiber Cable 25mm X 10 IL/T/F 5mm Hexapod 5mm ADC 15mm FiberViewCamera 15mm Power 15mm X 10 10/25/2015

4 Robin Lafever Other topics of note from Apr 21 Whiteboard session Best idea of the day ! All positioners have the same length Fiber lead. It should also include the Power lead. Many reasons why this is attractive. (make a list) Will work for both Front-load and Back-load options as long as the connectors will fit through the 10 mm Focal Plane holes.

5 10/25/2015 Robin Lafever Other topics of note from Apr 21 Whiteboard session The Corrector Barrel moves relative to the Cage assembly. Whatever utilities cross between them need flexures designed in. A lot of stuff crosses. List is building.

6 10/25/2015 Robin Lafever Other topics of note from Apr 21 Whiteboard session Since these will be assembled separately, then integrated on-site, this interface is a busy place. This forces us to put our connectors somewhere around here…....and it rules out the option of a Cable assembly with NO connectors.

7 10/25/2015 Robin Lafever Other topics of note from Apr 21 Whiteboard session 500 Fibers 16 X 32 Fibers 32 Fibers1 Fiber Positioner installation, Top fed, 32 per cluster

8 10/25/2015 Robin Lafever Other topics of note from Apr 21 Whiteboard session Positioner installation, Side fed, Single or cluster. Install positioner using ample slack…… then tie the fibers down on the anchor plane If we invoke the ‘One-length’ option we can try distributing connectors radially (see later slide) Otherwise we will certainly need a take-up loop in the circuit

9 10/25/2015 Robin Lafever Other topics of note from Apr 21 Whiteboard session Positioner Fibers are all the same length. Focal Plane Center Line 32 Fibers / Connector

10 10/25/2015 Robin Lafever Other topics of note from Apr 21 Whiteboard session Positioner Fibers are all the same length. Focal Plane CenterLine Single Fiber connectors distributed radially