Bechtel Nevada, Mail Stop NLV 018, Post Office Box 98521, Las Vegas, NV 89193-8521

66 -- FLASH X-RAY SOL BW003-DJ-99 DUE 082399 POC Dennis J. Jeffrey (702) 295-2192 E-MAIL: Click here to contact the contracting officer via, jeffredj@nv.doe.gov. Flash X-ray system to be used for film-recorded shadowgraphy including power supply, pulsers, two independent x-ray heads (both can be charged by a single power supply if design permits), and detectors for timing actual x-ray emissions from each head. System must incorporate two heads which are triggered independently. The application is to generate an two discrete images of a projectile in flight driven by a two-stage light gas gun; the images will be analyzed to determine precise projectile velocity. System characteristics are defined following: Requirements:. Signal Level: minimum of 5 mRad dose per pulse at distance of 1m from tube window. Unit must generate sufficient x-ray flux to ensure exposure of film located at distance of 10 ft from source with at least 1/2" of aluminum placed in the beam for vacuum & pressure windows. Target to be imaged on film is 1" dia plastic projectile, Pulse Duration: pulse width < 40 ns required; pulse length of < 30 ns is preferred. Triggering: the two x-ray heads must be triggered at different times (approximately 30 microseconds apart). An external signal will be provided to trigger each FXR head independently. The timing of the signal will be determined by other sensors in the application, not by a pre-set delay. The pulse shape and amplitude of the trigger can be adjusted to best suit unit requirements. Trigger Jitter: variance in the time of emission with respect to the input trigger signal is acceptable up to +/- 250ns. The critical feature is to know precisely when the x-rays are emitted. Spurious Triggering: premature or spontaneous emission of x-rays is extremely damaging to the experimental system. X-ray system must be maintained in ready (i.e., fully charged) state for minimum of 5 minutes without premature emission; prefer if this can be more than 10 minutes. Timing Detector: a detector is required to determine the precise time at which the x-ray pulse is emitted. This detector can be mounted near the head or, preferably incorporated. While pulse-shape information would be interesting, timing is critical with resolution equal to 1 ns. Posted 08/09/99 (W-SN365357). (0221)

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