| 摘要 |
The invention relates to a device (10, 40, 60,150) for generating electromagnetic THz radiation with free electron beams (54, 56, 78,190,192), comprising a dynatron tube (22), where the dynatron tube (22) comprises an electron source (12,58, 72, 76, 96, 124, 200, 202), an extraction grid (14, 44, 68, 64, 82, 186, 188), an anode (16, 46, 70, 84, 102, 204, 206) preferably coated with a material composition for high secondary electron emission, which are arranged in vacuum, further the dynatron tube (22) is connected to a voltage supply (24, 52) supplying an extractor voltage and an anode voltage with the setting that the extractor voltage is higher than the anode voltage, an oscillator (26, 47, 66, 194,196), which modulates the anode voltage and where the anode voltage is set to a work point voltage (30), and that the elements of the dynatron tube (22) are arranged in a way, that the oscillator voltage accelerates a positive primary current to the anode in one half of the voltage swing and in the second half of the voltage swing, such a high primary current is accelerated that a secondary electron current is emitted from the anode to the extraction grid (14,44,68,64,82,186,188), which has twice the value of the primary current and therefore delivers a resulting current and charge flow in reverse direction to the primary current. |
