Physics: Posters
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- ItemTest of GEANT 4 Simulation Efficiency Predictions for the Short-lived Isotope Counting System(Houghton University, 2024-10-07) Bo, Andrew; Belanger, Avery; Fall, Owen; Yuly, Mark; Hertz, Shoshanna; Richardson, Silas; Wilson, Liam; Ramos, Delvin; Woods, Michelle; Padalino, Stephen J.; Fletcher, Kurt; Freeman, Charles; Marcus, George; Forrest, Chad J.; Regan, Sean P.Ultrafast high power lasers may be used to generate short pulses of energetic ions that can be used for nuclear activation cross section measurements The Short Lived Isotope Counting System ( was developed to count the beta decays of radioactive product nuclei resulting from light ion reactions generated in this way One important SLICS parameter, which has been determined using a Geant 4 simulation, is the detection efficiency, the ratio of detected betas to number of product nuclei To test this prediction, an experiment was carried out using the SUNY Geneseo Pelletron A deuteron beam incident on a thin natural Li target created 840 ms half life 8 Li via the 7 Li( d,p 8 Li reaction The beta particles from the 8 Li decay were identified and counted by the SLICS detector, a dE E phoswich detector telescope Alpha particles from 8 Li(d,α) 4 He on the same natural lithium target were counted by a silicon surface barrier detector at various backward angles The efficiency of the SLICS detector was determined using the number of the α and β particles counted by the two detectors and the previously measured cross sections and Li isotopic abundances. This material is based upon work supported by the Department of Energy [National Nuclear Security Administration] University of Rochester “National Inertial Confinement Fusion Program” under Award Number(s) DE NA 0004144 and by SUNY Geneseo and Houghton University66th Annual Meeting of the APS Division of Plasma Physics, Atlanta, GA, October 7-11, 2024
- ItemDetecting Short-lived Isotopes Outside the OMEGA-60 Target Chamber Milliseconds After a High-Yield Shot(Houghton University, 2024-10-07) Bo, Andrew; Belanger, Avery; Fall, Owen; Yuly, Mark; Padalino, Stephen J.; Fletcher, Kurt; Freeman, Charles; Marcus, George; Forest, Chad J.; Stanley, Ben; Regan, Sean P.It may be possible to make fundamental nuclear science measurements of low energy light ion cross sections by collecting and counting the beta decays of the reaction products in the expanding neutral gas after an ICF shot with a doped target. To do this, the Short Lived Isotope Counting System (SLICS) uses a dE E phoswich detector telescope to identify beta particles, and can measure the decay curve for isotopes with half lives from about 20 ms to 20 s. To test the ability of SLICS to identify the desired beta events in the intense radiation environment just outside the OMEGA 60 target chamber immediately after a high yield cryogenic DT shot, a ride along experiment was carried out at the Laboratory for Laser Energetics. A sample of natural boron placed directly in front of the SLICS scintillators was activated by the primary 14.1 MeV DT neutrons via the 11 B(n, α 8 Li reaction. SLICS events falling in a particular region of the 2D histogram formed by the energy lost in the thin dE versus the thick E scintillators were considered to be beta particles, and the time distribution of these events was used to fit the 840 ms decay curve of 8 Li. This material is based upon work supported by the Department of Energy [National Nuclear Security Administration] University of Rochester "National Inertial Confinement Fusion Program" under Award Number(s) DE NA0004144, and by SUNY Geneseo and Houghton University.66th Annual Meeting of the APS Division of Plasma Physics, Atlanta, GA, October 7-11, 2024
- ItemDesigning and Constructing a Heater Stage for a Physical Vapor Deposition Chamber(Houghton University, 2024-04-20) Fall, Owen; Yelle, Luke; Hoffman, BrandonA thermal substrate stage was developed for physical vapor deposition of thin metal films. The stage can maintain a uniform, constant temperature across a 4 cm diameter substrate throughout the deposition process, even while it is being radiatively heated at ~5 W for 10 min by the evaporate metal. The substrate is adhered to an 11 cm diameter, 6.4 cm long aluminum heat sink. Previous experiments concluded that Ag paste produced the best thermal contact between the substrate and heat sink. To balance the most surface area possible for thermal contact and removability of the paste, grooves were made in the heat sink. The control stage features ceramic standoffs, holding the aluminum heat sink to the inside of the deposition chamber, and a heater wire pasted to the heat sink to initialize and stabilize the desired temperature.XLII Annual Rochester Symposium for Physics Students, University of Rochester, April 20, 2024
- ItemA TNSA Technique to Measure Light-Ion Cross Sections Using the MTW Laser(Houghton University, 2023-11-03) Lei, Chunsun; Harley, Noah; Hotchkiss, Andrew; Martin, Andrew; Yuly, Mark; Padalino, Stephen J.; Forrest, Chad J.; Sangster, Thomas C.; Regan, Sean P.An experiment was performed using the Multi-Terawatt Laser (MTW) at the Laboratory for Laser Energetics (LLE) to test the feasibility of using Target Normal Sheath Acceleration (TNSA) to measure 0.1 - 10 MeV light-ion cross sections. Laser pulses (∼22 J, 7 ps) struck a 0.25 mm2 deuterated polyethylene (CD2) target, ejecting TNSA deuterons that hit a thin natural Li target film on a 25 μm thick stainless-steel substrate, causing the 7Li(d,p)8Li reaction. The phoswich scintillator, light guide, and photomultiplier tube of the Short-Lived Isotope Counting System (SLICS) were placed immediately behind the Li target, and a CAEN Digitizer was used to count the 840 ms half-life beta decay of 8Li, beginning a few milliseconds after the laser shot. The phoswich detector consisted of a fast thin and slow thick scintillator sandwiched together to allow incident particles to be identified by their different rates of energy loss. Incident deuteron energy spectra were measured using time-of-flight (TOF) to a small scintillator in front of the Li target and, for comparison, with a Thompson parabola spectrometer. Funded in part by a grant from the DOE through the Laboratory for Laser Energetics, and by SUNY Geneseo and Houghton University.65th Annual Meeting of the APS Division of Plasma Physics, Denver, CO, October 30 – November 3, 2023.
- ItemCoated Li Film Targets for TNSA Light-Ion Reaction Experiments with the MTW Laser(Houghton University, 2023-11-03) Lei, Chunsun; Harley, Noah; Hotchkiss, Andrew; Martin, Andrew; Yuly, Mark; Padalino, Stephen J.; Forrest, Chad J.; Sangster, Thomas C.; Regan, Sean P.A system for creating Sn or Ag coated Li targets was developed for a Multi-Terra Watt (MTW) laser Target Normal Sheath Acceleration (TNSA) experiment to study the 7Li(d, p)8Li reaction. The Li targets were designed to have a ~50 nm thick coating to prevent Li from interacting with air and water vapor and be ~2 μm thick to reduce energy loss. The films were produced in a ~10−5 Torr evacuated deposition chamber in which about 15 A flowing one way through a diode circuit heated a stainless-steel boat holding a Li pellet to a thermocouple-measured temperature of nearly 400℃, evaporating the Li onto a 25 μm thick stainless-steel substrate. A current of up to 60 amps flowing the opposite direction through another diode heated a molybdenum boat holding a Sn or Ag pellet, evaporating the metal and forming the thin coating over the Li. The thicknesses were measured using a micrometer, magnetic adhesion, a home-made mechanical profilometer, and Rutherford backscattering. To allow Li metal to be weighed and inserted into the boat, an Air-filled glove box was constructed around the deposition chamber. Funded in part by a grant from the DOE through the Laboratory for Laser Energetics, and by SUNY Geneseo and Houghton University.65th Annual Meeting of the APS Division of Plasma Physics, Denver, CO, October 30 – November 3, 2023.