Special Report NuMI Target Updates

1. Kris Anderson 14-Mar-2011 Special Report NuMI Target Updates • Ongoing Work - Four Parallel Activities • Target Hall • • We expect to move NT-05 to morgue and ready target module for new target starting 03/17 • • Current target hall activities are not on the critical path • Autopsy of NT-05 in Target Hall Workcell • • Significant progress since last’s weeks presentation- will be presented in subsequent slides- autopsy results are complete • • Internal water circuit leak is in the location we identified while considering NT-03 and NT-04 failures and are associated with the internal water circuit downstream water turnaround-No other leak sites detected • Reclaim NT-02 as a contingency spare • •Good News: Pressure test results indicate NT-02 is still leak tight on the water and canister He volume circuit • • Bad News: Z-drive motion is likely compromised in perhaps a couple of locations • • ALARA plan to address slipping couplers and bearings blocks in progress- may take ~2 weeks of effort to reclaim z-drive motion (if possible) • NT-06 Retrofit • • Work has started to extract the target core from the target canister- this involves cutting welds and target core support fixturing which is a bit tricky– initial efforts are progressing with good results

2. Previously Identified Potential Failure Location Special Report NuMI Target Updates Downstream Water Turnaround Weldments NuMI Low Energy Target General Assembly Layout

3. Geometry Reference: X-ray Image of NT-05 Prior to Installation Special Report NuMI Target Updates Downstream Water Turnaround Suspect Weldments Outer Target Tube Cooling Pipe Graphite Fins

4. Special Report NuMI Target Updates Autopsy Results Documentation of Target Tube Before Autopsy Shows Signs of Potential Electrical Arcs From Horn Which May Have Created External Water Leaks in Target Tube Note : View is Inverted

5. Special Report NuMI Target Updates Autopsy Results Cutting NT-05 0.4mm Thick Aluminum Outer Tube in Workcell for Autopsy Tool Design by Vladimir Sidorov Camera View From Inside Workcell Target DS Tube

6. Special Report NuMI Target Updates Autopsy Results Cutting NT-05 Tube Removal of Target Outer Al Tube- Something is Missing Downstream Water Turnaround Is Not Connected

7. Special Report NuMI Target Updates Autopsy Results NT-05 View Thru Workcell Lead Glass After Cut DS Water Turnaround Connection Failure

8. Special Report NuMI Target Updates Autopsy Results Downstream Water Turnaround in Cutting Tool- Perspective Looking Downstream

9. Special Report NuMI Target Updates Autopsy Results • View is inverted •Graphite appears to be sound after 1.25E20 POT •No internal corrosion evident in target outer aluminum tube Borescope Here

10. Key Dates Special Report NuMI Target Updates Estimated Key Dates-Nominal Scenario I. NT-02 Path (Contingency Target) • NT-02 is leak tight but status of z-drive reclamation is still TBD • Likely to take about 1.5 -2 weeks of effort to define and implement procedure to assess and return z-drive mechanism to operational status; Estimate z-drive recovery 3/25 if repairable II. NT-06 Path •Estimate for NT-06 rework completion 3/31 (could be a few days sooner if no problems are encountered)- good progress to date •Expect significant progress this week • Install NT-06 in carrier, survey and final QA complete 4/8 • Complete installation of NT-06 into chase, beam scan, ready for normal beam operation: Monday 4/18/2011