| 摘要 |
A modular multistage accelerator (102) for use in an X-ray treatment system includes a first 10kV acceleration stage (150) which houses an electron beam gun supplied with -50kV of voltage. The modular multi-stage accelerator includes four additional 10kV stages (112, 114, 116, 118) placed in series with the first stage to achieve a 50kV accelerator overall. Each stage is shielded (190) to prevent stray electrons from being propagated along the length of the drift tube. The triple point within each modular stage is recessed to significantly reduce the emission of stray electrons within each stage. Additionally, the beam current at the X-ray emitting probe of the X-ray source is measured by isolating the beam current to a beam current measuring circuit (220) in electrical connection with a nulling junction node, wherein other currents within the circuit are nulled at the nulling junction node and the beam current flows to the beam current measuring circuit.
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