Spark-chamber detectors consists of metal plates placed in a sealed box filled with a gas such as helium, neon or a mixture of the two. As a charged particle travels through the detector, it will ionize the gas between the plates. A trigger system is used to apply high voltage to the plates to create an electric field immediately after the particle goes through the chamber, producing sparks on its exact trajectory.
Spark-chamber detectors are generally less accurate than bubble-chamber detectors, but can be made highly selective with the help of auxiliary detectors, making them useful in searching for very rare events.
WIPO PUBLISHES PATENT OF THERMO FISHER SCIENTIFIC (ECUBLENS) FOR "IMPROVED SPARK CHAMBER FOR OPTICAL EMISSION ANALYSIS" (SWISS INVENTORS)
Mar 12, 2012; GENEVA, March 12 -- Publication No. WO/2012/028484 was published on March 8. Title of the invention: "IMPROVED SPARK CHAMBER FOR...