Managed by UT-Battelle for the Department of Energy SNS Accelerator Ion Source RF System Existing Ion Source RF Systems Chip Piller RF Engineer

2Managed by UT-Battelle for the Department of Energy Accelerator Advisory Committee – January 2008 SNS Ion Source RF Systems Acknowledgement: Martin Stockli, Tom Hardek, Rob Welton, Yoon Kang, Syd Murray, Terry Pennisi, Manny Santana, Baoxi Han, Mike Clemmer, Mark Crofford, Jeff Ball, Mike McCarthy, Curtis Phibbs, Sasha Vassioutchenko, Sung-Woo Lee, Taylor Davidson, Stacey Jones, Chip Piller, Ray Fuja, et al.

3Managed by UT-Battelle for the Department of Energy Accelerator Advisory Committee – January 2008 SNS Ion Source RF Parameters  Pulse Repetition Rate60 Hz  Pulse Width up to 1.3 ms  2 MHz Power80 kW (120 kW)  MHz Power600 W (1200 W)  Antenna Inductance0.7 uH (3.0 uH external)

4Managed by UT-Battelle for the Department of Energy Accelerator Advisory Committee – January 2008 SNS Ion Source & RF Group  SNS Ion Source Goal: High Reliability, High Quality, High Intensity, Pulsed H- Ion Beam –“Good” plasma required  RF systems used to produce plasma –Controls/Instrumentation –Signal Generators –Amplifiers –Transmission lines –Matching Networks/transformers –Antennas  SNS RF group provides support for Ion Source RF Systems

5Managed by UT-Battelle for the Department of Energy Accelerator Advisory Committee – January 2008 SNS Ion Source RF Pictures September 25, 2009 Accelerator Status

6Managed by UT-Battelle for the Department of Energy Accelerator Advisory Committee – January 2008 Ion Source RF System Plasma Antenna 2 MHz Matching Network (Tunable) 13 MHz Matching Network (Tunable) -65 kV Deck 80 kW 2 MHz Pulsed RF System (Tunable) 600 W 13 MHz CW RF System Water Cooling Big Blue Box Source Golden Cable

7Managed by UT-Battelle for the Department of Energy Accelerator Advisory Committee – January 2008 SNS Ion Source RF Pictures September 25, kW Beam Power Plasma

8Managed by UT-Battelle for the Department of Energy Accelerator Advisory Committee – January 2008 SNS Ion Source RF Pictures September 25, 2009 Production Big Blue Box

9Managed by UT-Battelle for the Department of Energy Accelerator Advisory Committee – January 2008 QEI 80 kW 2 MHz Amplifier  We have 3 of these QEI amplifiers  Worked fine during development and initial operation of SNS

10Managed by UT-Battelle for the Department of Energy Accelerator Advisory Committee – January 2008 SNS Ion Source RF Pictures September 25, MHz Matching Network

11Managed by UT-Battelle for the Department of Energy Accelerator Advisory Committee – January 2008 SNS Ion Source RF Pictures 80 kW 2 MHz Amplifier Tube Socket Meltdown

12Managed by UT-Battelle for the Department of Energy Accelerator Advisory Committee – January 2008 SNS Ion Source RF Discussion Topics  Failures, Reliability: – Connectors & Cables – Mechanical – Materials (stainless screws,...) – Thermal (water cooling, stress,...) – System Integration (matching, 50 Ohm blocks) – Intermittent issues (problems “fix” themselves) – High Voltage/Power (conductors, dielectrics, spacing) – Margin, ratings  RF Power Meter  EPICS, Controls  Tuning & Calibration  RF Measurement: Network Analyzers & Oscilloscopes