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Helium/Hydrogen Measurements in High-Energy Proton-Irradiated Tungsten

WF. SommerPD. FergusonFA. GarnerML. HamiltonSA. MaloyBM. Oliver

出版	ASTM International, 2000
URL	http://books.google.com.hk/books?id=qQ5-zgEACAAJ&hl=&source=gbs_api

註釋

To provide structural material design data for the Accelerator Production of Tritium (APT) project, a 1 mA, 800 MeV proton beam at the Los Alamos Neutron Science Center (LANSCE) was used to irradiate a large number of metal samples, including a tungsten target similar to that being considered as the neutron source for the tritium production. The maximum proton fluence to the tungsten target was ~1021 protons/cm2. An unavoidable byproduct of spallation reactions is the formation of large amounts of hydrogen and helium. Postulated off normal conditions for APT would result in target temperatures approaching 1200°C. The use of tungsten target rods clad with Alloy 718 raises concerns as to the amount and rate of release of these gases under such off normal conditions, with the major concern being pressurization and possible failure of the cladding. To address these issues, portions of the LANSCE tungsten rods were heated to temperatures up to 1200°C, and the time-dependent evolution of helium and hydrogen gas was measured.