1. Mu2e WGM 4/21/2010 R. Ray Mu2e Project manager

2. Project Team We have a L2 manager for the tracker!  Aseet Mukherjee has assumed this role  Experience from successful CDF Central Tracker  Working to augment his team and find significant roles for 1 or 2 young people. L2 Manager for the Muon Channel (P. Limon) is retiring and leaving in less than 1 month.  Sandor Feher (TD) has agreed to take over from Peter.  Sandor was the Deputy Project Manager for APUL, now in hibernation.  Muon Channel is tightly coupled with the solenoid work. Sandor is tightly integrated into TD structure that is managing the solenoid subproject. INFN has yet to arrive at a consensus candidate for the Calorimeter L2.  I have been pressing them for the past week to resolve this. Should have a name soon. Some initial discussions about Trigger and DAQ L2 slot.  CD committed to conceptual design for CD-1. R. Ray - Mu2e WGM2

3. L2 Systems and Managers R. Ray - Mu2e WGM3 1.2 Accelerator M. Syphers 1.3 Conventional Construction T. Lackowski 1.4 Solenoids M. Lamm 1.5 Muon Channel S. Feher 1.6 Tracker A. Mukherjee 1.7 Calorimeter INFN 1.8 Cosmic Ray Veto C. Dukes 1.9 Trigger and DAQ TBD 1.1 Project Management R. Ray

4. Tracking Our two offline tracking and reconstruction experts are meeting in Berkeley this week.  After Rob returns we will have a meeting to discuss how to proceed to a Conceptual design. There are a limited number of questions that require an answer for CD-1.  We need to focus on these and leave the details for later. Also some R&D and prototyping work that will extend beyond CD-1 Our new L2 manager will be coordinating this work and setting simulation priorities. R. Ray - Mu2e WGM4

5. WBS, Cost, Schedule We have developed a draft WBS through L4 across the Project. Have a WBS dictionary for most activities. Still missing a few. Using the activities required for CD-1 as a development/training ground. R. Ray - Mu2e WGM5

6. ES&H and NEPA Met with Nathan Duff (PPD ES&H) last week to discuss safety.  Filled out Environmental Impacts Checklist (EIC) It is possible that Mu2e could qualify for the categorical exclusion.  No time consuming EA  Lab/DOE resources freed up to work on more difficult LBNE and Project X EA’s. Paul is organizing a meeting with DOE and ES&H to discuss how to proceed towards making such a determination. R. Ray - Mu2e WGM6

7. Heat Shield Emerging as Significant Risk Recall that the Heat Shield is intended to protect the Production Solenoid from target debris. Incoming proton beam is 25 kW ~ 2.1 kW is radiated into the heat shield/solenoid or removed by target cooling liquid. Adds to the heat load on the refrigerator Can cause temperature gradients in the cold mass that eat into temperature margin. Could lead to quenches. Potential for radiation damage to solenoid components. R. Ray - Mu2e WGM7 Tungsten Copper The MECO heat shield was a 76 ton water-cooled Cu and W structure.

8. DPA at 1 st coil R. Ray - Mu2e WGM8 DPA per year at 1 st coil DPA = Displaced Atoms Peak DPA in aluminum stabilizer is ~ 2.5 x 10 -5 /yr.  Close to critical value at 4.2°K. Leads to unacceptable rise in resistance.  Failure points not well known at low temperatures o Investigating possibility of reactor measurements of cold materials jointly with Japanese.

9. Heat Shield – cont. An alternative design of tungsten carbide balls and water reduces the radiation by ~10x.  Tungsten carbide is less expensive than tungsten, but an all tungsten carbide design is probably more expensive than tungsten + copper.  Need an engineer to do a conceptual design so we can get a cost estimate o PPD - Rucinski, Pushka, Stefanik… o TD – Rob Riley? o AD ? R. Ray - Mu2e WGM9

10. Requirements Documents R. Ray - Mu2e WGM10

11. Electronics LBL is just beginning to update the design of the BaBar Elefant Chip. This is the only electronics work we have done to date. Now that CD is beginning to work on the DAQ we need to get moving on FE electronics.  Our new L2 manager for the tracker and soon to be named L2 manager for the calorimeter will have to make this a priority and work with CD to come up with a coherent conceptual design. A Project Electrical Engineer could begin to play an important role  Probably only need 0.25 – 0.5 FTE in this role for the next year.  I have some ideas for who could play this role and will be talking to management about their availability. R. Ray - Mu2e WGM11

12. Action Items Get resources for CD-1 activities into P6. Begin work on predecessors and BOEs. Understand (and document!) the magnitude of the heat shield problem. Agree on a strategyfor getting the tracker to CD-1. Get L2 Manager for calorimeter in place. Get moving on FE electronics. R. Ray - Mu2e WGM12

13. Summary We continue to make good progress on the solenoids and accelerator. Work starting up again on the detector hall. One more round of verifying requirements before Conceptual design. Work will begin to accelerate on the tracker now that we have a L2 manager. The Heat Shield poses a significant technical and cost risk. We are working hard to understand this risk in detail. Will need some engineering to get us to a credible/defendable Conceptual Design. Trying to get more requirements documented. We have reached the point where we could us a Project EE. R. Ray - Mu2e WGM13