Ben Hatch, Nathan Palmer, Shannon Ayers, Don Browning, Brian Felker, Joe Holder, Doug Homoelle, Shahab Khan, Joe Kimbrough, Andrew MacPhee, Robert Petre, Brad Perfect, Alan Throop, J. Wong
X-ray streak cameras are used at the National Ignition Facility for time-resolved measurements of inertial
confinement fusion metrics such as capsule implosion velocity, self-emission burn width, and x-ray bang time (time
of brightest x-ray emission). Recently a design effort was undertaken to improve the performance and operation of
the streak camera photocathode and related assemblies. The performance improvements include a new optical
design for the input of UV timing fiducial pulses that increases collection efficiency of electrons off the
photocathode, repeatability and precision of the photocathode pack assembly, and increase the input field of view
for upcoming experiments. The operational improvements will provide the ability to replace photocathode packs
between experiments in the field without removing the diagnostic from the Diagnostic Instrument Manipulator
(DIM). The new design and preliminary results are presented.
A neutron hardened x-ray streak camera has been used to report x-ray burn duration and time of peak emission from
imploding ICF capsules at the National Ignition Facility with <30 ps. Recent characterization of the instrument using
a NIST traceable High Energy X-ray reference source (HEX, National Security Technologies) will enable absolute
capsule self-emission x-ray yield measurements (J/sr/keV). This manuscript describes the characterization procedure
used and preliminary results of the x-ray sensitivity using three different thicknesses of the CsI photocathode.
S. Khan, P. Bell, D. Bradley, S. Burns, J. Celeste, L. Dauffy, M. Eckart, M. Gerhard, C. Hagmann, D. Headley, J. Holder, N. Izumi, M. Jones, J. Kellogg, H. Khater, J. Kimbrough, A. Macphee, Y. Opachich, N. Palmer, R. Petre, J. Porter, R. Shelton, T. Thomas, J. Worden
We present a new diagnostic for the National Ignition Facility (NIF) [1,2]. The Streaked Polar Instrumentation for Diagnosing Energetic Radiation (SPIDER) is an x-ray streak camera for use on almost-igniting targets, up to ~1017 neutrons per shot. It measures the x-ray burn history for ignition campaigns with the following requirements: X-Ray Energy 8-30keV, Temporal Resolution 10ps, Absolute Timing Resolution 30ps, Neutron Yield: 1014 to 1017. The features of the design are a heavily shielded instrument enclosure outside the target chamber, remote location of the neutron and EMP sensitive components, a precise laser pulse comb fiducial timing system and fast streaking electronics. SPIDER has been characterized for sweep linearity, dynamic range, temporal and spatial resolution. Preliminary DT implosion data shows the functionality of the instrument and provides an illustration of the method of burn history extraction.
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