Design of a Helium Passivation System for the Target Vessel of the Beam Dump Facility at CERN
- Avigni, P. et al
- arXiv:1910.00333
 | Cross-section view of the target complex, the helium vessel and its internal components on a vertical plane containing the beam axis. |
 | Cross-section view of the target complex, the helium vessel and its internal components on a vertical plane containing the beam axis. |
 | Mesh slice in the collimator-target region, showing the gaps between the target and the shielding blocks. |
 | Mesh slice in the collimator-target region, showing the gaps between the target and the shielding blocks. |
 | Vector plot colored by velocity magnitude and clipped to 0.1 mm/s, showing regions of low flow velocity |
 | Vector plot colored by velocity magnitude and clipped to 0.1 mm/s, showing regions of low flow velocity |
 | Volume rendering of helium mole fraction during the flushing, showing the gradual filling of the vessel with helium pumped from the top inlet plenum |
 | Volume rendering of helium mole fraction during the flushing, showing the gradual filling of the vessel with helium pumped from the top inlet plenum |
 | Helium mole fraction as function of time, during the flushing transient. The curves represent the purity averaged over the fluid volume and the outlet boundary, compared to the injection curve (normalized to the fluid volume) |
 | Helium mole fraction as function of time, during the flushing transient. The curves represent the purity averaged over the fluid volume and the outlet boundary, compared to the injection curve (normalized to the fluid volume) |
 | Vector plot of helium mole fraction at 2.23 volume changes (clipped at 98.5\%), showing areas of stagnation of air |
 | Vector plot of helium mole fraction at 2.23 volume changes (clipped at 98.5\%), showing areas of stagnation of air |
 | Conceptual representation of the passivation system connected to the BDF Target Complex helium vessel. |
 | Conceptual representation of the passivation system connected to the BDF Target Complex helium vessel. |
 | Evolution of helium purity in the helium vessel from 85 vol.\% to 98 vol.\% during initial purification. The small difference between the curves considering and not considering for the impurities implies that the effects of outgassing/leakage are negligible during the startup process. |
 | Evolution of helium purity in the helium vessel from 85 vol.\% to 98 vol.\% during initial purification. The small difference between the curves considering and not considering for the impurities implies that the effects of outgassing/leakage are negligible during the startup process. |
 | Vector plot colored by velocity magnitude and clipped to 0.1 mm/s, showing regions of low flow velocity |
 | Evolution of helium purity from 98 vol.\% to 99.99 vol.\% in the helium vessel, showing that the impurity ingress rate has a direct effect on the maximum achievable average purity. |
 | Evolution of helium purity from 98 vol.\% to 99.99 vol.\% in the helium vessel, showing that the impurity ingress rate has a direct effect on the maximum achievable average purity. |
 | Piping and instrumentation diagram for the helium passivation system foreseen for the CERN's Beam Dump Facility (BDF) target complex. |
 | Piping and instrumentation diagram for the helium passivation system foreseen for the CERN's Beam Dump Facility (BDF) target complex. |
 | 3D model of the helium passivation system, showing the different components of the assembly. |
 | 3D model of the helium passivation system, showing the different components of the assembly. |
 | Volume rendering of helium mole fraction during the flushing, showing the gradual filling of the vessel with helium pumped from the top inlet plenum |
 | Piping and instrumentation diagram for the helium passivation system foreseen for the CERN's Beam Dump Facility (BDF) target complex. |
 | Vector plot colored by velocity magnitude and clipped to 0.1 mm/s, showing regions of low flow velocity |
 | Evolution of helium purity from 98 vol.\% to 99.99 vol.\% in the helium vessel, showing that the impurity ingress rate has a direct effect on the maximum achievable average purity |
 | Vector plot of helium mole fraction at 2.23 volume changes (clipped at 98.5\%), showing areas of stagnation of air |
 | Conceptual representation of the passivation system connected to the helium vessel |
 | Mesh slice in the collimator-target region, showing the gaps between the target and the shielding blocks. |
 | Evolution of helium purity from 98 vol.\% to 99.99 vol.\% in the helium vessel, showing that the impurity ingress rate has a direct effect on the maximum achievable average purity |
 | Cross-section view of the target complex, the helium vessel and its internal components on a vertical plane containing the beam axis. |
 | Helium mole fraction as function of time, during the flushing transient. The curves represent the purity averaged over the fluid volume and the outlet boundary, compared to the injection curve (normalized to the fluid volume) |
 | Mesh slice in the collimator-target region, showing the gaps between the target and the shielding blocks. |
 | 3D model of the helium passivation system. |
 | 3D model of the helium passivation system. |
 | Piping and instrumentation diagram for the helium passivation system foreseen for the CERN's Beam Dump Facility (BDF) target complex. |
 | Vector plot of helium mole fraction at 2.23 volume changes (clipped at 98.5\%), showing areas of stagnation of air |
 | Cross-section view of the target complex, the helium vessel and its internal components on a vertical plane containing the beam axis. |
 | Vector plot colored by velocity magnitude and clipped to 0.1 mm/s, showing regions of low flow velocity |
 | Evolution of helium purity in the helium vessel from 85 vol.\% to 98 vol.\% during initial purification. The small difference between the curves considering and not considering for the impurities implies that the effects of outgassing/leakage are negligible during the startup process |
 | Conceptual representation of the passivation system connected to the helium vessel |
 | Volume rendering of helium mole fraction during the flushing, showing the gradual filling of the vessel with helium pumped from the top inlet plenum |
 | Evolution of helium purity in the helium vessel from 85 vol.\% to 98 vol.\% during initial purification. The small difference between the curves considering and not considering for the impurities implies that the effects of outgassing/leakage are negligible during the startup process |