Special Report NuMI Target Updates Special Report NuMI Target Updates Ongoing Work - Four Parallel Activities I.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 II.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 III.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) IV.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 Kris Anderson 14-Mar-2011 Kris Anderson 14-Mar-2011

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

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

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

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

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

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

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

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

Special Report NuMI Target Updates 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 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 Key Dates