1. NLC - The Next Linear Collider Project James T Volk 10/03/2001 Report on Magnet Group Status May 7 th 2002 J Volk, C Spencer, B Parker

2. NLC - The Next Linear Collider Project Topics BBA alignment PM quad Measurement EM Quad Measurement Radiation Issues Vibration Final Focus Magnets Operations Costing and Availability

3. NLC - The Next Linear Collider Project BBA Continuing to measure the Wedge quad and EM to understand center stability Working on new ideas to improve center stability –Tuning rod adjustment schemes –Passive adjustment to wedge quad poles –Low flux issues for EM and PM quads Working with PT to refine requirements

4. NLC - The Next Linear Collider Project SLAC Rotating Coil Data May 2002 James T Volk

5. NLC - The Next Linear Collider Project New data on the electromagnetic quad with improved magnetic measuring set-up The SLAC rotating coil measuring set-up has been improved: a 5kW electric direct immersion water heater with an SCR controller has been put in the incoming cooling water circuit. Variations of ~ 4°C in LCW temp reduced to +/- 0.1 °C. Above plots show water temperatures during a 2.5 day run at 80 amps. James T Volk May 2002

6. NLC - The Next Linear Collider Project Radiation Damage Investigating SLC radiation measurements and NLC predictions on rates as it impacts Permanent Magnets Measuring SLC radiation fields; ID particle type and rates Starting measurements on radiation damage at SLAC and FNAL Continuing literature search International collaboration with Japanese groups already doing radiation damage studies

7. NLC - The Next Linear Collider Project Vibration Doing measurements on EM quad and water flow Working with ground motion group to understand sources And Accelerator groups to understand requirements imposed on magnets due to vibration

8. NLC - The Next Linear Collider Project Developing Methodologies to Estimate Overall Magnet Costs- including repair costs Use real failure data of magnets from similar accelerator to predict how often there will be failures of the magnets in the NLC. Estimate for a particular failure scenario how much it will cost to fix the failure– accounting for all aspects of the repair and the lost opportunity costs (for those failures happening during operations, when the accelerator is un-useable– have to ascribe an opportunity cost per hour). For real failure data: took all the magnet failures that brought down any beamline in SLAC during 5 year period. Using downtime reporting database we scrutinized every one of 75 failures as to its cause, type of magnet, length of time to detect and repair. Calculated number of SLAC magnets running during any period and how many hours they ran to calculate mean time between failures. Calculate availability values and extrapolate them to known number of NLC magnets running for 30 years. Estimate cost to fix all failures. James T Volk May 2002

9. NLC - The Next Linear Collider Project Final Focus Magnet

10. NLC - The Next Linear Collider Project Final Focus Magnet