NOTES FOR DISCUSSION AT DESIGN MEETING 261010 Jigs

NOTES FOR DISCUSSION AT DESIGN MEETING (26/10/10) Jigs drawing now online and ready for review: TCP: D 1002140 ERM: D 1002201 BS/FM: D 1002147 FOR THIS MEETING: QUESTIONS REGARDING BS/FM JIG DESIGN: : We are proposing one holder for both prisms (shown in slides 2 -5), with their respective prism positions set in the holder before bonding. 1. Confirm respective prism position (as in D 1000576 & D 0901076) Ø main sapphire prism (D 080765) coincident with COM Ø secondary prism (D 0902368) position – confirm respective angle…. . see slides to follow (especially slide 5) 2. V-blocks: what is the preferred approach ØModify existing V-blocks at Hanford [D 1001685 V-block Assembly (2 off)] (slide 6 to clarify issues) Ø Are there any specific requirements for a BS/FM V-block (i. e. is there something already in use? Ø Are there special clamping requirements? 1

BS/FM jig: basic views, simplified design compared with TCP/ERM (alignment guides removed) 2

Prototype holder (made from POM) and mock prisms X X X LIP (R 185 mm) CONTACTS WITH MASS Only 2 pins for secondary prism 3

Alignment onto mass, extra clearance to access screws Reference the fiducial line on mass with straight edge on jig itself Extra clearance Round nosed spring plunger (both sides) 4

Confirm respective prism position: (1) or (2) or other? 2 1 From D 0901076 -v 3 5

Existing v-block: modifications required (view from below) Increase clearance Remove material Add supports/barriers 6

Existing v-block: support surfaces Increase surface contact 7