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Air gap |
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| An air gap between the heaters and the barrel allows for a
high-speed draft of air (over 6000 ft/min) for rapid cooling. When an electron beam enters a material (this includes the
accelerator exit window, the air gap and the material being irradiated),
the energy of the accelerated electron is greatly altered. The 25 micro meter Kapton window on
the exit aperture of the beam pipe, an identical Kapton window on the
entrance aperture of the detector, and a 155 mm air gap between these
two windows degraded the electron energy to 976 keV. |
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