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Investigating Breakdown Phenomena at 352 MHz: Collaborative Research Insights

This document outlines the investigation of breakdown occurrences at 352 MHz, focusing on the absence of substantial results and measurements pertaining to Breakdown Voltage Discharge (BDR) at the SPL/Linac4 facility. The research highlights collaborations on high-power tests of the CCDTL and PIMS prototypes, emphasizing the exchange of ideas and the necessity for a test stand and measurement system. The complexity of breakdowns related to different pulse durations and their implications on performance are also discussed, along with the motivation behind this rigorous testing framework.

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Investigating Breakdown Phenomena at 352 MHz: Collaborative Research Insights

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  1. Breakdowns at 352 MHz Rolf Wegner Rolf Wegner Breakdowns at 352 MHz

  2. Results: • no substantial results • no measurements of BDR Aim: • exchange of ideas • work together* 352 MHz cavity + test stand * no automated conditioning system* no measurement system for BDR Rolf Wegner Breakdowns at 352 MHz

  3. Outline • Motivation • SPL / Linac4 • CCDTL prototype • PIMS prototype • Discussion Rolf Wegner Breakdowns at 352 MHz

  4. Motivation • high power test of CCDTL, • f0= 352 MHz, standing wave cavitytp= 0.5 ms (176’000 cycles, ~ 10*QL)frep= 1..50 Hzcondition 1 week, operation 1 week, BDR < 10-5 • tp= 1.0 ms ==> many breakdowns, 1 day conditioning • tp= 2.0 ms ==> many breakdowns • CLIC workshop: E ~ tp-1/6(BDR=const.) Rolf Wegner Breakdowns at 352 MHz

  5. SPL / Linac4 Rolf Wegner Breakdowns at 352 MHz

  6. SPL / Linac4 Rolf Wegner Breakdowns at 352 MHz

  7. SPL / Linac4 Rolf Wegner Breakdowns at 352 MHz

  8. CCDTL prototype Rolf Wegner Breakdowns at 352 MHz

  9. CCDTL prototype Rolf Wegner Breakdowns at 352 MHz

  10. CCDTL prototype f0 = 352.2 MHz Pd = 170 kW (1 tank) Wstored = 2.7 J (1 tank) Q0,m = 38000 r/Q = 364 Ω ZT2 = 42 MΩ/m E0 = 3.8 MV/m Emax = 30 MV/m (1.7 Kilp.) Hmax = 17 kA/m Scmax = 22 kW/mm2 Max(|H|)17 kA/m Max(Sc)22 kW/mm2 Max(|E|) 30 MV/m Rolf Wegner Breakdowns at 352 MHz

  11. Kilpatrick f = 1.643 Ek2 * exp(-8.5/Ek) [f in MHz, Ek in MV/m] Rolf Wegner Breakdowns at 352 MHz

  12. Rolf Wegner Breakdowns at 352 MHz

  13. Rolf Wegner Breakdowns at 352 MHz

  14. Rolf Wegner Breakdowns at 352 MHz

  15. CCDTL prototype Rolf Wegner Breakdowns at 352 MHz

  16. CCDTL prototype Rolf Wegner Breakdowns at 352 MHz

  17. PIMS prototype Rolf Wegner Breakdowns at 352 MHz

  18. PIMS prototype f0 = 352.2 MHz Pd = 110 kW (1 cell) Wstored = 1.6J (1 cell) Q0,m = 23000 r/Q = 143 Ω ZT2 = 33 MΩ/m E0 = 4.0 MV/m Emax = 33 MV/m (1.8 Kilp.) Hmax = 11 kA/m Scmax = 18 kW/mm2 Max(|H|)11 kA/m Max(Sc)18 kW/mm2 Max(|E|) 33 MV/m Rolf Wegner Breakdowns at 352 MHz

  19. PIMS prototype Rolf Wegner Breakdowns at 352 MHz

  20. PIMS prototype Rolf Wegner Breakdowns at 352 MHz

  21. discussion Sc ~ 20 kW/mm2, tp = 1 ms scaling tp0 = 100 ns Rolf Wegner Breakdowns at 352 MHz

  22. discussion Sc ~ 20 kW/mm2, tp = 2 ms scaling tp0 = 100 ns Rolf Wegner Breakdowns at 352 MHz

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