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The voltage in an EBW operation is 39 kV. The beam current is 39 milliamp. The electron beam is focused on a circular area that

The voltage in an EBW operation is 39 kV. The beam current is 39 milliamp. The electron beam is focused on a circular area that is 0.5 mm in diameter. The heat transfer factor is 0.87. Calculate the average power density in the area (in W/mm²).

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