Spark chamber

Bubble chambers could detect short-lived particles but could not be triggered on demand. Cloud chambers could be triggered but weren't sensitive enough. Spark chambers achieved both by using neon gas that crossed many metal plates.
 Saburo Fukui and Shotaro Miyamoto Japan 1959 Spark chamber

Bubble chambers could detect short-lived particles but could not be triggered on demand. Cloud chambers could be triggered but weren't sensitive enough. Spark chambers achieved both by using neon gas that crossed many metal plates.