Purpose

• HPM generator/source diagnostics:
  measurement of current, voltage, local
  electric or magnetic field, etc.
• Free-field measurements
  (electric and magnetic fields).

HPM source diagnostics (Vircator driven
by a Marx generator): measurement of
several electrical parameters

Skills

• Passive probes (high sensitivity and dynamics)
• H-field, E-field and current time derivative response: B-dot,
  D-dot & I-dot probes
• direct time response: special current probe inside a
  groove (up to 750 MHz) and TEM antenna (0.2 GHz–3 GHz)
• High-voltage carbon resistive divider with large bandwidth.

Coaxial calibration cell

Facilities

• Calibration coaxial cell
• 170 mm diameter, cutoff frequency above 6 GHz
• CALMOPLA: 2 m x 2 m² ground plane for sensor calibration
• good accuracy up to 6 GHz
• Electronic devices (fast oscilloscopes,
  network analyzer, etc.)
• Anechoic chamber: 12.5 m x 5.5 m x 3 m
• absorption >27 dB [0.3–10 GHz]
• transmission <-90 dB [0.1–10 GHz].

CALMOPLA: calibration with monopole on
the ground plane


B-dot calibration with CALMOPLA


ISL anechoic chamber

Results

• Output characterization of fast high-power generator with 50 W carbon divider
  (DC -1.7 GHz, up to 500 kV)
• Electron beam / plasma current measurement (several tens of kA)
• Free-field measurement beyond 100 kV/m from 100 MHz to 6 GHz.