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Air gap

   Also found in: Encyclopedia, Wikipedia 0.07 sec.
1.(Physics) An air-filled gap in a magnetic or electric circuit; specif., in a dynamo or motor, the space between the field-magnet poles and the armature; clearance.


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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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