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The Stanford Linear Accelerator Center pulsed x-ray facility.

N E Ipe, R C McCall, E D Baker

    Health Physics
    |April 1, 1987
    PubMed
    Summary
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    A new pulsed x-ray facility at the Stanford Linear Accelerator Center (SLAC) was developed to test radiation detection instruments. This versatile system addresses challenges posed by pulsed radiation fields from accelerators.

    Area of Science:

    • High-energy physics instrumentation
    • Radiation detection and measurement

    Background:

    • The Stanford Linear Accelerator Center (SLAC) operates a high-energy linear accelerator producing pulsed electron beams.
    • The pulsed nature of these beams complicates radiation detection and measurement from both the accelerator and its klystron power sources.

    Purpose of the Study:

    • To establish a dedicated pulsed x-ray facility at SLAC.
    • To enable the testing and calibration of radiation detection instruments in pulsed radiation fields.

    Main Methods:

    • Construction of a pulsed x-ray tube with an electron gun, control grid, and a target window (Al/Au).
    • Utilized internal and external pulsers to control pulse frequency (60-360 Hz), pulse width (360 ns to 5 µs), and pulse shape.
    • Variable electron gun voltage (0-100 kV) and current amplitude.

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  • Shielded facility with plywood and lead lining for versatility and safety.

    • Main Results:

    • Achieved a maximum absorbed dose rate of 258 Gy/h at 6.35 cm below the target window, measured by an ionization chamber.
    • Demonstrated variability in pulse parameters (frequency, width, amplitude) and electron gun voltage.

    Conclusions:

    • The developed pulsed x-ray facility is a versatile tool for evaluating radiation detection instruments under realistic pulsed conditions.
    • The facility effectively simulates radiation environments encountered in high-energy accelerator operations.