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Breakdowns at 352 MHz

Breakdowns at 352 MHz. Rolf Wegner. 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. Outline. Motivation SPL / Linac4 CCDTL prototype

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Breakdowns at 352 MHz

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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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