Future of Vacuum Tubes: ARIES Workshop Discussion Highlights
Plenary discussion at the ARIES Workshop on Energy Efficient RF at Uppsala University delved into the future of vacuum tubes, including tetrodes, IOTs, klystrons, and modulators. Key topics discussed were the reliability of vacuum tubes, potential for solid-state power amplifiers to replace them, challenges in IOT maturity, and advancements in high-efficiency klystrons. The dialogue also touched upon magnetrons, testing methodologies, and industry collaboration for innovation.
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Panel Discussion: Future of Vacuum Tubes Future of Vacuum Tubes Plenary Discussion: ARIES Workshop on Energy Efficient RF ngstr m Laboratory, Uppsala universitet 18 20 June 2019 Uppsala, Sweden
Tetrodes didnt talk much about them, but well continue to rely on them for the next decades. Hope for SSPAs to eventually take over IOT/MB-IOT Klystron Magnetron Other? 19 June 2019 ARIES Workshop on Energy Efficient RF Discussion: Future of Vacuum Tubes 2
IOTs MB-IOT successful, but no solid data for lifetime. How to make it mature ? Thales: someone must fully validate technical choices. Who? CERN IOT experience (& Alba, RAL, ) Requires very systematic procedures and preventive maintenance, but the IOT itself seems to have acceptable lifetime (35kh+) Smoothing capacitors: lifetime in operation>>lifetime on shelf (?!) 19 June 2019 ARIES Workshop on Energy Efficient RF Discussion: Future of Vacuum Tubes 3
Klystrons & modulators What about the LLRF request to work well below saturation? Rise time losses in pulsed operation: can we switch RF on when voltage is at (say) 90%? With additional phase FF, e.g. Beautiful SML modulator 660 kVA! (Jema) 19 June 2019 ARIES Workshop on Energy Efficient RF Discussion: Future of Vacuum Tubes 4
High-efficiency klystrons Where do we stand? What should we concentrate on ? How to best include industry win/win What method for which application? (COM, BAC, CSM, kladistron ) Multi-gap output cavity advantages and disadvantages. How to proceed to fully validate? Superconducting solenoid vs permanent magnet focussing? Spurious oscillations in EuCARD-2 tube understood? All these simulation codes benchmarking them against each other. Efficiency limits: have we included everything? (bunch saturation, bunch congregation, space charge power, radial stratification, asymmetry, beam rotation) 19 June 2019 ARIES Workshop on Energy Efficient RF Discussion: Future of Vacuum Tubes 5
ESS-8 19 June 2019 ARIES Workshop on Energy Efficient RF Discussion: Future of Vacuum Tubes 6
What about magnetrons? What should the community (we) do? Discard the idea, or validate it? But not do nothing about it What are the relevant tests to be conducted? 19 June 2019 ARIES Workshop on Energy Efficient RF Discussion: Future of Vacuum Tubes 7
