Gaseous sample collection at the National Ignition Facility

Summary form only given. Radiochemical diagnostic techniques such as solid- and gas- phase capsule debris analysis may prove to be successful methods for establishing the success or failure of ignition experiments at the National Ignition Facility (NIF). Samples in the gas phase offer the most direct method of collection by simply pumping out the large target chamber following a NIF shot. The target capsules will be prepared with dopants which will produce radioactive noble gas isotopes upon activation with neutrons. We have designed the Radchem Apparatus for Gas Sampling (RAGS) in order to collect post- shot gaseous samples for NIF capsule diagnostics. The design of RAGS incorporates multiple stages intended to purify, transfer, and count the radioactive decays from gaseous products synthesized in NIF experiments. The modular design of RAGS allows for experimental flexibility and expansion, and various operation scenarios will be depicted. We will also present preliminary results of the gas collection (or separation) efficiency, as well as a construction update.