These days, Ronic and I achieved 200kW inside the cavity and 70% coupling efficiency.
- By optimizing the telescope, the coupling reached 70% with iris fully open and maintained 60%-70% coupling at high power.
- The cavity mode went from 2.2mm,2.5mm (38kW) to finally 2.3mm,2.8mm (200kW) without changing a lot.
- Gradually raising the power while optimizing alignment, CEP, and locking, we got the following stable power:
| Amp current (A) |
Injection power (W) |
Circulating power (kW) |
Gain |
| 2 |
10 |
38 |
3800 |
| 2.3 |
14 |
50 |
3571 |
| 3 |
22 |
70 |
3181 |
| 4 |
35 |
115 |
3285 |
| 5 |
48 |
158 |
3292 |
| 8 |
87(Estimated) |
202 |
2322 |
- Next steps:
- Explain the strange drop phenomenon that occurs at high power, where both transmission and reflection drop, as in Fig. 2.
- Maintains a half-hour locking at 200kW. Now the temperature of the amplifier at 8A is over 40 degrees, which may be risky.
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