Radiation detector development in KAERI

• Дата: 2004
• Автори: Yong Kyun Kim, Se Hwan Park, Jang Ho Ha, Woo Gyo Lee, Seok Boong Hong, Chong Eun Chung
• Формат: Стаття
• Мова: English
• Опубліковано: НТК «Інститут монокристалів» НАН України 2004
• Назва видання: Functional Materials
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/135240
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Radiation detector development in KAERI / Yong Kyun Kim, Se Hwan Park, Jang Ho Ha, Woo Gyo Lee, Seok Boong Hong, Chong Eun Chung // Functional Materials. — 2004. — Т. 11, № 1. — С. 194-200. — Бібліогр.: 14 назв. — англ.

The radiation detector research group in KAERI has developed two types of gas-filled radiation detectors, a Gas Electron Multiplier (GEM) and an ion chamber. The double GEM and triple GEM were fabricated and operated in several gas mixtures to obtain large gains of about 5-104 and 6-105, respectively, in the Ar/Isobutane mixture. For the application to GEM Photo Multiplier (GPM), the ion feedback dependency of the double GEM was carefully measured according to the drift electric field, the transfer field, the asymmetry of the GEM voltage, and the effective gain in various gas mixtures. The ion feedback depends significantly on the drift field and the effective gain, however it is almost independent of the gas mixture. A model of ion feedback in a double GEM structure was derived, and its prediction was compared with the experiment. The optimum value of the transfer field and the dependency of the collection current with respect to the drift, transf er, and collection field strengths for the GEM voltage sharing in the double GEM were measured. An air-filled ion chamber was designed and fabricated as a prototype of the beam loss monitor for the high power accelerator. The collection efficiency and stability of the ion chamber with respect to the different radii of anode electrode were measured.