ECR Title: Adding HWS Channels to DAQ for new Cleaned HWS code Addition	DCC No: E2300133-v1
Date: May/11/2023
Requester: Camilla Compton	Impacted Subsystem(s): TCS, CDS
Description of Proposed Change(s): Addition of 54 channels to the HWS IOC and DAQ at both sites. Channels: L1:TCS-{OPTIC}_HWS_CLEAN_SPHERICAL_POWER_{X,Y,AVG} L1:TCS-{OPTIC}_HWS_CENTER_ESTIMATE_{X,Y} L1:TCS-{OPTIC}_HWS_{BEAM,CO2,RH}_POS_{X,Y} For OPTIC: ITMX, ITMY, ETMX, ETMY. These channels are already implemented at LHO (alog 68748 and 65966). Implementation is adding these channels to the HWS ioc on all 4 h1hws computers (method in 65966), then updating the L1EPICS_HWS.ini file and performing a DAQ restart. The new cleaned code has not yet been installed or tested on live data at either site. We will test at LHO before pulling HWS code changes to LLO. In the meantime, the channels should be added so they are ready.
Reason for Change(s) / Motivation: These channels will let us pull new hws code developed by Huy-Tuong Cao with functionalities to estimate wavefront centers and filter unusually large gradients. This will give us cleaner spherical power data to monitor test masses thermal changes. Code: https://git.ligo.org/HWS/hws-server/-/merge_requests/1
Motivation / Projected benefit (check all that apply): Increased Sensitivity Decreased Glitch Rates Re-engineering to cope with obsolescence Re-engineering to cope with sourcing issues Re-engineering for technology insertion Re-engineering for life extension of aging components/subsystems
Rough Estimated Cost (Materials, Supplies, Equipment): n/a
Rough Estimated Labor (Hours only): 1 hour
Rough Estimated Schedule: During Tuesday Maintenance
Schedule Impact Estimate: n/a
Nature of Change (check all that apply): Safety Correct Hardware Correct Documentation	Improve Hardware Improve Software 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: ____________ Essential by date/event: ____________ Immediately (ASAP)
Impacted Hardware (select all that apply): Repair/Modify. List part & SNs: ______________________ Scrap & Replace. List part & SNs:_____________________ Installed units? List IFO, part & SNs: _________________ Future units to be built	Impacted Documentation (list all dwgs, design reports, test reports, specifications, etc.): Impacted Software (list all that apply):
Disposition of the proposed change(s): The disposition of this proposed engineering change request is to be completed by Systems Engineering and indicated in the “Notes and Changes” metadata field in the DCC entry for this ECR. The typical dispositions are as follows: Additional Information Required: in which case the additional information requested is defined. The ECR requester then re-submits the ECR with the new information using the same DCC number for the ECR but with the next version number. Rejected: in which case the reason(s) for the rejection are to be given Approved Approved with Caveat(s): in which case the caveat(s) are listed TRB: the ECR is referred to an ad-hoc Technical Review Board for further evaluation and recommendation. It is the System Engineer’s (or designee’s) responsibility to organize the TRB. The System Engineer (or designee) then makes a technical decision based on the TRB’s recommendation. Links to the TRB’s documentation (charge, memos, final report, etc.) are to be added to the “Related Documents” field for this ECR. CCB: a change request for approval of additional funds or schedule impact is to be submitted to the Configuration Control Board. Links to the CCB’s documentation (CR, etc.) are to be added to the “Related Documents” field for this ECR. Concurrence by Project Management: Acknowledgement/acceptance/approval of the disposition is to be indicated by the electronic “signature” feature in the DCC entry for this ECR, by one the following personnel: Systems Scientist Systems Engineer Deputy Systems Engineer