Table 1. Main specifications of the electron gun.
| Component | Specifications |
|---|---|
| Extraction voltage | 60 kV |
| Maximum current | >100 mA |
| Grid type | Aperture grid |
| Cathode emission | Thermionic |
| Cathode material | LaB6 or CeB6 |
| Cathode diameter | 2.0 mm |
| Cathode-grid voltage | 5.0 kV (DC)/3.5 kV (pulse) |
| Beam size at anticathode | <1.0 mm × 0.1 mm |
| Normalized emittance | A few π mm mrad |