Division of accelerators, cryogenics and magnetism

Technical means

• Liquid Helium cooling: a main refrigerator unit providing up to 30 l/h to the horizontal cryostat, allowing one to provide helium at 4.2 K or 1.8 K by pumping on the helium bath.
• High power RF platform equipped with:
  • two klystrons (P_Peak = 1.1 MW, f = 704 MHz), providing pulses with duration T ≤ 3.6 ms at f = 14 Hz,
  • one klystron (P_Peak = 2 MW, f = 1.3 GHz), providing pulses with duration T ≤ 1 ms at f = 10 Hz,
  • possibility to install RF source provided by client.

Full RF control and safety chain is provided for existing power sources.

Technical steps, expertise

• Mounting of the cavity equipped with its tuner in the horizontal cryostat,
• Mounting of the power coupler to the cavity, connection to pumping lines and RF power lines,
• Leak checks and low power RF checks at room temperature,
• Cooling down to 4.2 and/or 1.8 K, with fast ramps (3 K/min) from 150 to 50 K,
• Control of cavity frequency, field ramp in cavity by injecting increasing RF power and concurrent measurement of quality factor deduced from Pi, Pt, Pref,
• Control of tuning system capabilities in terms of frequency range, hysteresis, etc.