Solenoid Test Setup with Real Components
Explore the test setup with a real solenoid and uniform bias conducted by Gennady Romanov, focusing on the distribution of RF losses, results with fitted parameters, and non-linearity of H. Gain insights on the solenoid model, gyromagnetic resonance, and experimental frequencies.
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Presentation Transcript
The test set-up with real solenoid and uniform bias. Gennady Romanov 2ndHarmonic cavity meeting November 9, 2017
Solenoid model Yoke d1 Ceramic Garnet Copper d2 Yoke Number of turns 224 d1>d2, may be the garnet should be flipped over? I solenoid = 5 A =2.9 6 H Lowest H 15000 A/m, while gyromagnetic resonance at 75 MHz is 2100 A/m 2 Gennady Romanov |The test set-up with real solenoid and uniform bias. 9/XI-2017
Distribution of RF losses at I_sol = 4.2 A Normal copper 5.8e7 S/m Garnet Al800_exp4 (our base model) Shown interval of losses is from 0.07 to 0.6 W/m3 3 Gennady Romanov |The test set-up with real solenoid and uniform bias. 9/XI-2017
Results with constant = 0.0036 (H = 24 Oe at f0 = 9.4 GHz) Empty 2215 1870 Frequency excellent agreement Q similar general behavior In the experiments the lowest Q is defined mostly by losses in the garnet Gyromagnetic resonance is well below lowest internal bias field. Non-linear (Hbias) ? - is integrated parameter, average over the disk volume, not a material characteristic. Losses in the garnet dominate 4 Gennady Romanov |The test set-up with real solenoid and uniform bias. 9/XI-2017
Results with fitted Hand two copper conductivities Q vs I_sol F vs I_sol 2500 130 120 2000 110 1500 F, MHz 100 Q 90 1000 Experiment 20171027 Normal copper, fitted dH Fitted copper, fitted dH, uniform H Normal copper, fitted dH Experiment 20171027 Fitted copper, fitted dH, uniform H 80 500 70 0 60 0 5 10 15 20 25 0 5 10 15 20 25 I_sol, A I_sol, A Normal copper, fitted H H was fitted to get experimental Q at low end and smoothly reach theoretical Q at high end with. Copper conductivity was kept constant (5.7e7 S/m). Fitted copper, fitted H, uniform H conductivity of copper was chosen to meet experimental Q of empty test set-up and then kept constant (4.7e7 S/m), H and uniform H were fitted to get experimental frequencies and Qs. 5 Gennady Romanov |The test set-up with real solenoid and uniform bias. 9/XI-2017
Non-linearity of H H fitted 80 Normal copper, fitted dH 70 Fitted copper, fitted dH, uniform H 60 H, Oe 50 40 30 20 0 5 10 15 20 25 I_sol, A 6 Gennady Romanov |The test set-up with real solenoid and uniform bias. 9/XI-2017
