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High Power Measurements and Q Factor Analysis of Toshiba Cores

In the recent experiments conducted by John Reid, Kiyomi Seiya, and Dennis Barak, various high power measurements and Q factor analyses were performed on Toshiba cores 0979 and 9070. Key findings include observations of resonant frequencies, forward and reverse power, and cavity voltages across different bias currents. Notably, the high-loss effect was not observed even at 6.57 kW forward power. The team plans to compare new measurements to previous data and continue characterizing their structure for improved performance.

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High Power Measurements and Q Factor Analysis of Toshiba Cores

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  1. Last week • No bias current • Resonant Frequency: 34.963 MHz • Forward power: 5.04 kW • Reverse power: 729 W • Cavity voltage: 2.7375 V (p-p) • Q = 64.6 at ~5 kW • No high loss effect observed John Reid, KiyomiSeiya, and Dennis Barak

  2. Plan of attack • Try another Toshiba core (these are the lossiest cores that we have) • Make high power measurements of the fixture without any cores inserted • Including Q • Introduce a bias current and make high power measurements • Try a new core? John Reid, Kiyomi Seiya, Dennis Barak

  3. TOS 0979 core • No bias current • The high loss effect was not observed even with 6.57 kW of forward power. • Q measurements • Q = 67.4 at about 5 kW (SG set to +7.1 dBm) • Q = 87.5 at lower power (SG set to 0 dBm) • Very similar to the other Toshiba core (TOS 9070) John Reid, Kiyomi Seiya, Dennis Barak

  4. Measurements of unloaded structure • Forward power: 4 kW • Reverse power: 389 W • Resonant frequency: 42.2975 MHz • Cavity voltage: 10.825 V • Q measurements • Q = 669 (SG set to +7.1 dBm) • Q = 778.6 (SG set to 0 dBm) • Q did not change too drastically compared to the loaded structure John Reid, Kiyomi Seiya, Dennis Barak

  5. Try biasing the core • Slowly increased the bias current while finding the resonant frequency with each change in bias current • The high loss effect was observed with a bias current of 1500 A • TOS 0979 core • Forward power: 4.289 kW • Reverse power: 328 W • Cavity pickup voltage: • 6.2 V before high loss effect • About 5 V after high loss effect John Reid, Kiyomi Seiya, Dennis Barak

  6. High loss effect – cavity pickup John Reid, Kiyomi Seiya, Dennis Barak

  7. Follow-on burst John Reid, Kiyomi Seiya, Dennis Barak

  8. High loss at maximum bias current? • Bias current: 10,000 A • Forward power: 4.22 kW • Reverse power: 243 W • Cavity pickup voltage: 11.125 V (p-p) • SG setting: +9 dBm • Q: 655 • No high loss effect John Reid, Kiyomi Seiya, Dennis Barak

  9. Next steps • Compare these measurements to older data • Place a stackpole core inside the structure and make the same measurements • Try a new core • Continue to characterize our measurements • Possible issue: • The return bus bar was getting hot at 10,000 A. • The current was dropping by about 5 A every single pulse while components were warming up. • Testing of new ferrites will start once we understand the results that we are getting John Reid, Kiyomi Seiya, Dennis Barak

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