ECR Title: ECR: Eliminating the ALS Wavefront Sensors	DCC No: E12xxxxx-vx
Date: 9/28/2012
Requester: Daniel Sigg	Impacted Subsystem(s): ISC
Description of Proposed Change(s): Eliminate the WFS in the end stations. Eliminate the WFS heads, the table feedthroughs, the demodulators, the whitening chassis, the ASC demodulator concentrator, the legacy WFS PD interface, the legacy PD concentrator, the associated cabling, the associated channels in the EtherCAT chassis and the associated channels in the front-end computer.
Reason for Change(s): The ALS wavefront sensors were of little value during the One Arm Test and we propose to eliminate them.
Estimated Cost: $0k
Schedule Impact Estimate: None.
Nature of Change (check all that apply): Safety Correct Hardware Correct Documentation	Improve Hardware Improve/clarify Documentation Change Interface Change Requirement
Importance: Desirable for ease of use, maintenance, safety Desirable for improved performance, reliability Essential for performance, reliability Essential for function Essential for safety	Urgency: no urgency desirable by date/event: _Feb 2013____ Essential by date/event: ____________ Immediately (ASAP)
Impacted Hardware (select all that apply): Repair/modify. List part & SNs: ______________________ Scrap & Replace. List part & SNs:___TBD_____________ Installed units? List IFO, part & SNs: _________________ Future units to be built	Impacted Documentation (list all dwgs, design reports, test reports, specifications, etc.): D1002803, D1001423, D1100670, E1100591, D1100682, D1100683
Disposition (to be completed by Systems Engineering): TRB CCB Approved Additional information required. Define: [Requester re-submits with new information with the same DCC E-number for the ECR but the next version number.] Concurrence by Project Management: (Acknowledged Electronically in DCC) Project Systems Engineer: Dennis Coyne Project Systems Scientist: Peter Fritschel