Remarks on detecting high-energy deuterium-tritium fusion gamma rays using a gas Cherenkov detector

摘要

As fusion ignition conditions are approached using the national ignition facility (NIF),independent high-bandwidth gamma-ray fusion burn measurements become essential complements to information obtained from neutron diagnostics.The 16.75-MeV gamma rays that accompany deuterium-tritium (d + t) fusion can be detected using a high-bandwidth gaseous carbon dioxide Cherenkov threshold detector.The detection energy threshold was set by the CO_2 gas pressure.A 1-GHz detector system was fielded successfully at the Omega laser facility,demonstrating unambiguous detection of high-energy fusion gamma rays from high-yield d + t implosions.An experiment to detect the approx 12.5MeV d-t fusion gamma ray is described.