Speaker
Description
The beam commissioning of the CSNS-II Drift Tube Linac (DTL) requires a beam dump capable of absorbing high-intensity H⁻ beam pulses with energies of 20–80 MeV and an average beam power of up to 200 W at 1 Hz. A major challenge is to mitigate both the severe thermal load on the dump itself and the radiation impact on the downstream superconducting section. To address these issues, a Faraday dump was designed with a TZM (Ti-Zr-Mo) alloy entrance foil and cup to tolerate thermal shock, a Red-8 isostatic graphite block for heat sink and dissipation, and an additional shielding layer(W/W85Cu15) to reduce downstream activation. The calculated energy deposition distributions were further imported into thermal conduction analysis to assess the temperature field and structural response of the dump with COMSOL. The results show that the TZM-graphite configuration effectively reduces the peak power density and prevents melting or excessive thermal deformation under the design operating conditions. In addition, W85Cu15 provides better overall shielding performance than pure tungsten in suppressing downstream proton and neutron flux, while also offering improved thermal conductivity and manufacturability. The residual dose rates behind the dump remain within the safety limits for superconducting linac operation. These results demonstrate that the proposed design satisfies the requirements for DTL beam commissioning and provides effective protection for downstream components.
Funding Agency
Work supported by National maga science project CSNS-II
| I have read and accept the Privacy Policy Statement | Yes |
|---|---|
| Paper submission software | LATeX |