Nathan Riley

Nathan Riley
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Nathan Riley
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Physics - Accelerator Physics (2)
 
Physics - Medical Physics (1)
 
High Energy Astrophysical Phenomena (1)
 
Physics - Plasma Physics (1)
 
Physics - Instrumentation and Detectors (1)
 
High Energy Physics - Experiment (1)

Publications Authored By Nathan Riley

In a series of experiments at the Texas Petawatt Laser (TPW) in Austin, TX, we have used attenuation spectrometers, dosimeters, and a new Forward Compton Electron Spectrometer (FCES) to measure and characterize the angular distribution, fluence, and energy spectrum of the X-rays and gamma rays produced by the TPW striking multi-millimeter thick gold targets. Our results represent the first such measurements at laser intensities > 10 21 W*cm-2 and pulse durations < 150 fs. We obtain a maximum yield of X-ray and gamma ray energy with respect to laser energy of 4% and a mean yield of 2%. Read More

We present data for relativistic hot electron production by the Texas Petawatt Laser irradiating solid Au targets with thickness between 1 and 4 mm. The experiment was performed at the short focus target chamber TC1 in July 2011, with laser energies around 50 J. We measured hot electron spectra out to 50 MeV which show a narrow peak around 10 - 20 MeV plus high energy exponential tail. Read More