(1) DOCUMENT CHANGE NOTICE (DCN):

DCN No. E0900345-v1


(2) INFORMATION:

DOCUMENT No.	TITLE
D0902447-v1:	LASTI TCS Ring Heater Installation Retrofit
D0902448-v1:	LASTI TCS Ring Heater Back Plate RH
D0902449-v1:	LASTI TCS Ring Heater Back Plate LH


(3) CHANGE DESCRIPTION (FROM / TO):

Initial release. See (7).


(4) REASON FOR CHANGE:

See (7).


(5) SIGNATURES REQUESTED:

Phil Willems
Calum Torrie
Dennis Coyne


(6) DCN DISTRIBUTION:

Phil Willems
Calum Torrie
Dennis Coyne


(7) NOTES: 

The included parts, D0902448-v1 & D0902449-v1, are designed to fit the Ring Heater installation currently existing in the sealed LASTI vacuum chamber, as retrofit replacement parts within that installation. They are also designed to fit the TM Suspension structure to which that installation is currently mounted. The included Installation Retrofit drawing, D0902447-v1, should be used as a reference for said retrofit operations.

An `AdLIGO` Ring Heater version is in a tentative design state under the assy name and number "D0901269_ADV_LIGO_TCS_RING_HEATER_AND_SHIELD_ASSEM". That version will be completed for future release based on eventual FF&F tests of the LASTI retrofit resulting from this Change Notice.