<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Dear colleagues,<br class=""><br class="">We would like to report to you about the MOLLER project Director's Review that took place late last month on September 27 - 29. This review was conducted to provide advice in preparation for the DOE Office of Project Assessment (OPA) Independent Project Review scheduled for early November 2021. The OPA review is the annual review to determine if the experiment is on track for a CD-2/3 combined review in the fall of 2022. The final report of the Director's Review committee is attached. <div class=""><br class=""></div><div class="">The overall assessment was very positive, and useful feedback was provided that is being used to optimize talks for the upcoming OPA review. Thanks to the collaboration and project team for all their work that has gotten us to this point, and thanks to those who prepared materials for and presented at this review. A special shoutout to the tremendous work done by many postdocs and students without which such a successful outcome wound not have been possible. </div><div class=""><br class=""><div class="">The talks for this review are posted in DocDB:</div><div class=""><a href="https://moller.jlab.org/cgi-bin/DocDB/private/DisplayMeeting?conferenceid=31" class="">https://moller.jlab.org/cgi-bin/DocDB/private/DisplayMeeting?conferenceid=31</a><br class=""><div class=""><br class="">From the MOLLER project management perspective, Jim compiled these summary comments:</div><div class=""><br class=""></div><div class="">The Director’s Review was about as good as one can hope for and indicated we are not only ready for the upcoming OPA review, but are well on the way to being ready for CD-2/3. In large part our success is directly attributable to the enormous effort put in by the collaboration over the past year. Below are some excerpts of comments from the attached report.<br class=""><br class=""><ul type="disc" style="margin-top: 0in;" class=""><li class="MsoListParagraph" style="margin-bottom: 12pt; margin-top: 0in; margin-left: 0in;">The overall status of the MOLLER project is excellent. The management and technical teams have made impressive progress since the last review and should be commended on their work to date.<span style="font-size: 12pt;" class=""></span></li><li class="MsoListParagraph" style="margin-left: 0in;">The state of the Project Management documentation (PPEP, AS, RMP etc.) are very mature. These documents will easily be ready for CD-2/3 next year and are in fact largely at the necessary stage already.<span style="font-size: 12pt;" class=""></span></li><li class="MsoListParagraph" style="margin-left: 0in;">The MOLLER project team has made substantial updates to their resource-loaded schedule effectively addressing the recommendations from previous reviews. The maturity of the schedule is ready for a CD-2/3 review. The costs are fully captured, though there remains work to update/accurately capture the NSF and CFI costs. </li><li class="MsoListParagraph" style="margin-left: 0in; text-align: justify;">We commend the project for down-selecting to the segmented coil design for the Toroidal magnet, enabling the team to focus on developing the final design and fabrication plan.<span style="font-size: 12pt;" class=""></span></li><li class="MsoListParagraph" style="margin-left: 0in; text-align: justify;">The recently approved vendor contract for the toroid magnet positions the team to systematically advance the spectrometer and to proceed with a coil prototype fabrication, and the contract approach with options should allow for timely transitioning to production once the prototype is vetted.</li><li class="MsoListParagraph" style="margin-left: 0in;">With the detector systems now moving into prototyping and testing, supplemental documentation on the specific goals of prototypes and tests, and results of detector components would be helpful towards CD2/3. As an example, the linearity of the PMTs is essential for the experiment and documentation of the impact of radiation on PMT performance and lifetime may be beneficial.<span style="font-size: 12pt;" class=""></span></li><li class="MsoListParagraph" style="margin-left: 0in;">Presentation on HV Monolithic Active Pixel Sensors (CFI scope) including details for the 7 chip flexprint strips to the PMTs was more than adequate for this level of the design stage. Readout data transfer is planned with the CERN Giga-Bit-Transceivers and delivery delays will need to be considered in order to meet the Project installation schedule.<span style="font-size: 12pt;" class=""></span></li></ul><p class="MsoNormal">The recommendations are largely housekeeping items we would do in any case and are targeted at management issues in general:</p><ol type="1" start="1" style="margin-top: 0in;" class=""><li class="MsoListParagraph" style="margin-bottom: 12pt; margin-top: 0in; margin-left: 0in;">In advance of the pre-CD2/3 review, the project should re-evaluate the risk registry, specifically with respect to COVID-19 direct and in-direct (supply chain) impacts.<span style="font-size: 12pt;" class=""></span></li><li class="MsoListParagraph" style="margin-left: 0in;"><span style="color: windowtext;" class="">In advance of the pre-CD2/3 review</span>, the project should ensure that spikes in the resources required in the schedule have been leveled such that the project can succinctly describe where the required personnel will be coming from.</li><li class="MsoListParagraph" style="margin-left: 0in;">Present a more thorough ES&H discussion at future reviews.</li><li class="MsoListParagraph" style="margin-left: 0in;">If the apparent supply chain issues arising from COVID-19 for the power supplies persist, the Project should explore options for advanced procurement potentially including a CD-3A approval.<span style="font-size: 12pt;" class=""></span></li><li class="MsoListParagraph" style="margin-left: 0in;">The project should finalize alignment tolerances and establish a QA program to ensure the tolerances are met throughout installation of the detectors and the highly-correlated spectrometer collimators and magnets.</li></ol>Best regards,<br class="">KK, Mark, and Jim<br class=""><div class=""></div></div></div></div></body></html>