R. B. Stephens
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View article: Enhanced glass dynamics facilitated by soft interfaces
Enhanced glass dynamics facilitated by soft interfaces Open
A persistent mystery in glass physics is the origin of the rapid slowdown of relaxations during supercooling toward Tg (glass transition temperature). Theoretical studies suggest that growing elastic barriers are critical in this phenomeno…
View article: Overview of LANL short-pulse ion acceleration activities
Overview of LANL short-pulse ion acceleration activities Open
An overview of Los Alamos National Laboratory's activities related to short-pulse ion acceleration is presented. LANL is involved is several projects related to Inertial Confinement Fusion (Fast Ignition) and Laser-Ion Acceleration. LANL h…
View article: Data from A National Bowel Cancer Screening Programme using FIT: Achievements and Challenges
Data from A National Bowel Cancer Screening Programme using FIT: Achievements and Challenges Open
Colorectal cancer accounts for 11% of all cancer-related deaths in Ireland. With the aim of diagnosing these cancers at an earlier stage, and detecting premalignant lesions, the National Screening Service (NSS) offered a fecal immunochemic…
View article: BowelScreen leaflet from A National Bowel Cancer Screening Programme using FIT: Achievements and Challenges
BowelScreen leaflet from A National Bowel Cancer Screening Programme using FIT: Achievements and Challenges Open
Explanatory leaflet to participants explaining sharing of data with family doctors and colonoscopy units where relevant
View article: Data from A National Bowel Cancer Screening Programme using FIT: Achievements and Challenges
Data from A National Bowel Cancer Screening Programme using FIT: Achievements and Challenges Open
Colorectal cancer accounts for 11% of all cancer-related deaths in Ireland. With the aim of diagnosing these cancers at an earlier stage, and detecting premalignant lesions, the National Screening Service (NSS) offered a fecal immunochemic…
View article: BowelScreen leaflet from A National Bowel Cancer Screening Programme using FIT: Achievements and Challenges
BowelScreen leaflet from A National Bowel Cancer Screening Programme using FIT: Achievements and Challenges Open
Explanatory leaflet to participants explaining sharing of data with family doctors and colonoscopy units where relevant
Studies of Electron Transport and Isochoric Heating and Their Applicability to Fast Ignition Open
Experimental measurements of electron transport and isochoric heating in 100 J, 1 ps laser irradiation of solid A1 targets are presented. Modeling with a hybrid PIC code is compared with the data and good agreement is obtained using a heur…
View article: Polyamorphism of vapor-deposited amorphous selenium in response to light
Polyamorphism of vapor-deposited amorphous selenium in response to light Open
Significance Amorphous selenium (a-Se) has a complicated molecular structure with overcoordinated defects and dangling bonds. This light-sensitive structure can undergo significant changes including bond breakage, reconnection, and defect …
View article: A National Bowel Cancer Screening Programme using FIT: Achievements and Challenges
A National Bowel Cancer Screening Programme using FIT: Achievements and Challenges Open
Colorectal cancer accounts for 11% of all cancer-related deaths in Ireland. With the aim of diagnosing these cancers at an earlier stage, and detecting premalignant lesions, the National Screening Service (NSS) offered a fecal immunochemic…
View article: Reduced fast electron transport in shock-heated plasma in multilayer targets due to self-generated magnetic fields
Reduced fast electron transport in shock-heated plasma in multilayer targets due to self-generated magnetic fields Open
Fast electron transport has been studied in cold solid density CH, cold CH foam (200 mg / cm3), and CH plasma (40 eV 30 mg/cm3) targets—the latter created by shocking the CH foam with a 1.2 kJ long pulse laser and allowing it to expand. Th…
View article: Transport and spatial energy deposition of relativistic electrons in copper-doped fast ignition plasmas
Transport and spatial energy deposition of relativistic electrons in copper-doped fast ignition plasmas Open
Fast electron transport and spatial energy deposition are investigated in integrated cone-guided Fast Ignition experiments by measuring fast electron induced copper K-shell emission using a copper tracer added to deuterated plastic shells …
View article: Observation of extremely strong shock waves in solids launched by petawatt laser heating
Observation of extremely strong shock waves in solids launched by petawatt laser heating Open
Understanding hydrodynamic phenomena driven by fast electron heating is important for a range of applications including fast electron collimation schemes for fast ignition and the production and study of hot, dense matter. In this work, de…
View article: Calibration and characterization of a highly efficient spectrometer in von Hamos geometry for 7-10 keV x-rays
Calibration and characterization of a highly efficient spectrometer in von Hamos geometry for 7-10 keV x-rays Open
We have built an absolutely calibrated, highly efficient, Bragg crystal spectrometer in von Hamos geometry. This zinc von Hamos spectrometer uses a crystal made from highly oriented pyrolytic graphite that is cylindrically bent along the n…
View article: Investigation of laser pulse length and pre-plasma scale length impact on hot electron generation on OMEGA-EP
Investigation of laser pulse length and pre-plasma scale length impact on hot electron generation on OMEGA-EP Open
Here, a series of experiments studying pre-plasma's effect on electron generation and transport due to a high intensity laser were conducted on the OMEGA-EP laser facility. A controlled pre-plasma was produced in front of an aluminum foil …
View article: Targets for high repetition rate laser facilities: needs, challenges and perspectives
Targets for high repetition rate laser facilities: needs, challenges and perspectives Open
A number of laser facilities coming online all over the world promise the capability of high-power laser experiments with shot repetition rates between 1 and 10 Hz. Target availability and technical issues related to the interaction enviro…