Annular End Reaction Mass (AERM)

Document #:

LIGO-D1500163-v2

Document type:

D - Drawings

Abstract:

Redesigned End Reaction Mass (ERM) with Dia. 200 mm hole in center

Files in Document:

• D1500163-v2.PDF (file is not accessible)

ICS/JIRA Record:

• ICS_LINK

Topics:

• System Engineering
• Basic R&D

Authors:

• Eduardo Sanchez
• GariLynn Billingsley

Notes and Changes:

Notes on changes to current version:
-F/D: Updated registration marking note in multiple locations.
-Zone B/5: Added wedge requirements.
-Zone B/7: Thickness tolerance +/-.05
-Zone C/4: Added detail 'D'
-Drawing title was: E&D, End reaction mass (ERM)
-Updated note no. 4, was: .....incremental staring with "01"

---

Mod for next rev:
-Zone F/5: Center void diameter 222.5 ± 0.25 mm with similar Cyl. & Perp. as OD (340mm)
Explicitly call out the known density of SF2 glass - note the final mass is the critical metric.

---

Released for comment (not production)

Gold coating specification E0900138
ESD coating pattern D090949
Barrel coating pattern D090958