Managed by UT-Battellefor the Department of Energy

SNS Accelerator Ion Source RF System

Existing Ion Source RF

SystemsChip Piller

RF Engineer

2 Managed by UT-Battellefor 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.

3 Managed by UT-Battellefor the Department of Energy Accelerator Advisory Committee – January 2008

SNS Ion Source RF Parameters

Pulse Repetition Rate 60 Hz

Pulse Width up to 1.3 ms

2 MHz Power 80 kW (120 kW)

13.56 MHz Power 600 W (1200 W)

Antenna Inductance 0.7 uH (3.0 uH external)

4 Managed by UT-Battellefor 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

5 Managed by UT-Battellefor the Department of Energy Accelerator Advisory Committee – January 2008

SNS Ion Source RF Pictures September 25, 2009Accelerator Status

6 Managed by UT-Battellefor the Department of Energy Accelerator Advisory Committee – January 2008

Ion Source RF System

Plasma Antenna

2 MHzMatchingNetwork(Tunable)

13 MHz MatchingNetwork (Tunable)

-65 kVDeck

80 kW2 MHzPulsedRF System(Tunable)

600 W13 MHz CWRF System

WaterCooling

Big Blue BoxSource

Golden Cable

7 Managed by UT-Battellefor the Department of Energy Accelerator Advisory Committee – January 2008

SNS Ion Source RF Pictures September 25, 2009840 kW Beam Power

Plasma

8 Managed by UT-Battellefor the Department of Energy Accelerator Advisory Committee – January 2008

SNS Ion Source RF Pictures September 25, 2009Production Big Blue Box

9 Managed by UT-Battellefor 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

10 Managed by UT-Battellefor the Department of Energy Accelerator Advisory Committee – January 2008

SNS Ion Source RF Pictures September 25, 200913 MHz Matching Network

11 Managed by UT-Battellefor the Department of Energy Accelerator Advisory Committee – January 2008

SNS Ion Source RF Pictures

80 kW 2 MHz AmplifierTube Socket Meltdown

12 Managed by UT-Battellefor 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