Structural design and manufacturing of TPE-RX vacuum vessel

Sago, Hiromi; Orita, Junichi; Kaguchi, Hitoshi; Ishigami, Yuichi; Urata, K.; Kudough, F.; Hasegawa, Mitsuru; Oyabu, I.; Yagi, Y.; Sekine, S.; Shimada, Takahiro; Hirano, Y.; Sakakita, Hajime; Koguchi, Haruhisa

doi:10.1016/s0920-3796(99)00061-7

Cited by 3 publications

(1 citation statement)

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“…A frequency band from 0.1 to 10 kHz is selected. The lowest frequency is selected to cut off a steady mode pattern, which is partially due to the structure of the vacuum vessel made from bellows and thick wall sections [12]. The highest bound is one-tenth the sampling frequency of the data acquisition system.…”

Section: Magnetic Fluctuation Amplitudementioning

confidence: 99%

Improved confinement in the TPE-RX RFP by means of the PPCD

Yagi¹,

Maejima²,

Sakakita³

et al. 2002

Plasma Phys. Control. Fusion

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Pulsed poloidal current drive (PPCD) (Sarff J S et al 1994 Phys. Rev. Lett. 72 3670) is conducted in a reversed-field pinch (RFP) machine, TPE-RX. The PPCD yields a twofold improvement of poloidal beta and energy confinement time. A quiescent phase is observed in the magnetic fluctuations, δb, during the PPCD. The result is discussed in terms of the change of the equilibrium configuration along the F -trajectory (F and are the reversal and pinch parameters, respectively). Representative mode amplitude is numerically simulated. The result indicates that a transient nature of the PPCD, where τ PPCD (characteristic time of the PPCD operation) τ D (0) (resistive diffusion time of the core) holds, allows a trajectory with a deeper F which yields a less turbulent configuration than shot-by-shot F -scans. It is shown that the improvement ratio of τ E approximately scales as δb −2 for five cases of the PPCD experiments in three RFP machines, including the present work in TPE-RX.

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Section: Magnetic Fluctuation Amplitudementioning

confidence: 99%