![]() As a result, an ionization chamber capable of 400 keV energy resolution coupled with the velocity measurements described here will pave the way for modestly efficient measurements of light fission fragments with unit mass resolution. Computed particle velocities are accurate to within 0.06 mm/ns corresponding to a precision of 0.5%. Flight more » times were measured with 250 ps resolution FWHM. Particle trajectories on the order of 700 mm are determined accurately to within 0.7 mm. Each detector module is comprised of thin electron conversion foil, electrostatic mirror, microchannel plates, and delay-line anodes. The time pick-off detector pairs to be used in SPIDER have been tested with α-particles from 229Th and its decay chain and α-particles and spontaneous fission fragments from 252Cf. The SPectrometer for Ion DEtermination in fission Research (SPIDER) is a 2E–2v spectrometer designed to measure the mass of light fission fragments to a single mass unit. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment Additional Journal Information: Journal Volume: 788 Journal Issue: C Journal ID: ISSN 0168-9002 Publisher: Elsevier Country of Publication: United States Language: English Subject: 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY spectrometer fission mass yeilds 2E-2v method = ,Ī position-sensitive, high-resolution time-of-flight detector for fission fragments has been developed. Publication Date: Research Org.: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States) Sponsoring Org.: USDOE OSTI Identifier: 1291214 Alternate Identifier(s): OSTI ID: 1247383 Report Number(s): LA-UR-15-20101 Journal ID: ISSN 0168-9002 Grant/Contract Number: AC52-06NA25396 Resource Type: Accepted Manuscript Journal Name: Nuclear Instruments and Methods in Physics Research. of New Mexico, Albuquerque, NM (United States) (LANL), Los Alamos, NM (United States) Colorado School of Mines, Golden, CO (United States) Finally, these mass yield results measured from 252Cf spontaneous fission products are reported from an E–v measurement. Individual measurement resolutions were met for time-of-flight (250 ps FWHM), spacial resolution (2 mm FHWM), and energy (92 keV FWHM for 8.376 MeV). For commissioning, the fully assembled system measured fission products from spontaneous fission of 252Cf. Moreover, the SPIDER instrument, consisting of detector components for time-of-flight, trajectory, and energy measurements, has been assembled and tested using 229Th and 252Cf radioactive decay sources. The 2E–2v method of measuring the kinetic energy (E) and velocity (v) of both outgoing fission products has been utilized, with the goal of measuring the mass of the fission products with an average resolution of 1 atomic mass unit (amu). Source holder : from height adjust rod to source centre : 8 cms.We developed the SPectrometer for Ion DEtermination in fission Research (SPIDER) for measuring mass yield distributions of fission products from spontaneous and neutron-induced fission.All plates have the provision to place the source adjust rod at the centre or mid-point or edge of the bell-jar.Hence maximum board size 18 X 18 cms (including any plugs & sockets)īoard should have feet of at least 5cm to allow for cabling.īoards should sit horizontal and NOT mounted vertically.īNC bulkhead vacuum connectors (socket to socket) Bell jar :27cm diameter base, 20 cm high (+ 10 cm radius dome).These laser-based systems will be able to map the chip topography and will not carry with them the inherent radiation hazards associated with the partially-sealed Cf-252 sources. As the CASE system is a low rate pre-test facility that cannot be focussed onto particular regions of interest on the chip studies are now being carried out into the use of laser-based test systems. As memory density and processor complexity increases more and more metallisation layers are being used which makes it more difficult for the fission products to penetrate through to the sensitive volume. ![]() To increase the fission product fluence at the device under test (DUT) the device itself needs to be decapsulated and the CASE system operated in an evacuated bell jar. The average Linear Energy Transfer (LET) of the fission products is 43 MeV/(mg/cm 2 ). The spontaneous fissioning 252Cf sources used have typical activities of 1 - 2 ♜i (40-50kBq) with the following properties :ĭecays by alpha emission (96.9%) to 248Cm or spontaneous fission (3.1%)Īn average of 3.7 neutrons per fission with an average energy of 2.3MeV.Ĭf-252 has a very high specific activity (ie 1 gram equals 20TBq (537Ci)).Īt 1m a 1 ♜i source produces a dose equivalent of 23.3 µSv/hr (n's)& 1.6 µSv/hr (γ's). Californium Assessment for Single event Effects ![]()
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