Test Mass annealing data for use in pre-figuring calculations

Document #:

LIGO-T2600213-x0

Document type:

T - Technical notes

Abstract:

A node for collection of annealing data for LIGO Test Masses.

T2600095 describes the necessity for multiple, long annealing steps and subsequent pre-figuring of Test Masses prior to final coating.

ETM11 - T2600214
ETM14 - T2600215
ETM17 - T2600216
ETM18 - T2600217
ETM19 - T2600218
ETM20 - T2600219

Spreadsheet detailing Zernike coefficients for the surface figure of each optic after each annealing stop. Calculation of the magnitude of the change with each annealing step.
https://docs.google.com/spreadsheets/d/1E138nNZk5b1yPm0g5jmwv_Z9FD9ArQtnlAk1d_1Ce1U/edit?gid=1033646586#gid=1033646586

Files in Document:

None

Topics:

• Core Optics
• Fabrication

Authors:

• GariLynn Billingsley
• Laurent Pinard
• Camille Makarem

Notes and Changes:

Note on the LMA data:
305 mm is the max aperture with our reference sphere.
The power in the maps is a remaining RoC difference between the substrate and the reference sphere. So do not use it. Instead, use the calculated Roc after annealing for all the substrates, this RoC is calculated on 160mm center diameter.
The etched line on the top of the substrate is aligned accurately with a reference mark on the reference sphere mount indicating the vertical. The test mass arrow is at the bottom of the data set.

Related Documents:

Referenced by:

• LIGO-E1000763: aLIGO COC Testing and Commissioning Documentation