| 摘要 |
A light source is powered by a magnetron (1) and has a quartz crucible (2) having a plasma void (8) with an excitable fill, from which light radiates in use. Two aluminium attachment blocks (3,4) are attached together and the block (3) is attached to a casing (5) of the magnetron (1) by screws - not shown. The quartz crucible is attached to the block (4) by a Faraday cage (6), in the form of a perforate metal enclosure secured at its rim (7) to the block (4). An output formation (11) of the magnetron has a conductive, copper cap (12) fitted in electrical contact with it. The cap is extended by a copper rod (14). The rod extends through the blocks (3,4) into a bore (15) in the crucible (2) for coupling microwaves from the magnetron into the crucible. An airspace (16) is provided around the cap (12) in the block (3). From the cap, the rod extends with negligible air gap in an alumina ceramic tube (17) through the airspace and a boss (18) of the block (4) located in an aperture in an end wall of the block (3). |
