title: CNS active target (CAT) for missing mass spectroscopy with intense beams.
abstract: A new gaseous active target based on a time projection chamber, named CAT, is introduced. The remarkable feature is a dual gain THGEM to decrease the effective gain for the beam particles while keeping a high enough effective gain for the recoil particles. The measured effective gain of low gain region was a factor of one hundred smaller than that of high gain region. This technique provides a wide dynamic range in order to detect both the beam and recoil particles at the same time even with a very high intensity beam of more than 105Hz.
authors: Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198 Japan.
authors: S
authors: S
authors: Ota
authors: Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198 Japan.
authors: H
authors: H
authors: Tokieda
authors: Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198 Japan ; RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198 Japan.
authors: C S
authors: CS
authors: Lee
authors: Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8654 Japan.
authors: Y N
authors: YN
authors: Watanabe
keywords: Active target; Deuterium; Gas target; THGEM; Time projection chamber