title: Dynamical programming based turbulence velocimetry for fast visible imaging of tokamak plasma.
abstract: An orthogonal dynamic programming (ODP) based particle image velocimetry (PIV) technique is developed to measure the time resolved flow field of the fluctuating structures at the plasma edge and scrape off layer (SOL) of tokamaks. This non-intrusive technique can provide two dimensional velocity fields at high spatial and temporal resolution from a fast framing image sequence and hence can provide better insights into plasma flow as compared to conventional probe measurements. Applicability of the technique is tested with simulated image pairs. Finally, it is applied to tangential fast visible images of QUEST plasma to estimate the SOL flow in inboard poloidal null-natural divertor configuration. This technique is also applied to investigate the intricate features of the core of the run-away dominated phase following the injection of a large amount of neutrals in the target Ohmic plasma. Development of the ODP-PIV code and its applicability on actual plasma images is reported.
authors.affiliation: Institute for Plasma Research, Bhat, Gandhinagar 382428, Gujarat, India.
authors.forename: Santanu
authors.initials: S
authors.lastname: Banerjee
authors.affiliation: RIAM, Kyushu University, 6-1 Kasuga Koen, Kasuga-shi, Fukuoka 816-8580, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Zushi
authors.affiliation: Mechanical System Engineering, Hiroshima University, Hiroshima 739-8527, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Nishino
authors.affiliation: IGSES, Kyushu University, 6-1 Kasuga Koen, Kasuga-shi, Fukuoka 816-8580, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Mishra
authors.affiliation: RIAM, Kyushu University, 6-1 Kasuga Koen, Kasuga-shi, Fukuoka 816-8580, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Onchi
authors.affiliation: RIAM, Kyushu University, 6-1 Kasuga Koen, Kasuga-shi, Fukuoka 816-8580, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Kuzmin
authors.affiliation: RIAM, Kyushu University, 6-1 Kasuga Koen, Kasuga-shi, Fukuoka 816-8580, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Nagashima
authors.affiliation: RIAM, Kyushu University, 6-1 Kasuga Koen, Kasuga-shi, Fukuoka 816-8580, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Hanada
authors.affiliation: RIAM, Kyushu University, 6-1 Kasuga Koen, Kasuga-shi, Fukuoka 816-8580, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Nakamura
authors.affiliation: RIAM, Kyushu University, 6-1 Kasuga Koen, Kasuga-shi, Fukuoka 816-8580, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Idei
authors.affiliation: RIAM, Kyushu University, 6-1 Kasuga Koen, Kasuga-shi, Fukuoka 816-8580, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Hasegawa
authors.affiliation: RIAM, Kyushu University, 6-1 Kasuga Koen, Kasuga-shi, Fukuoka 816-8580, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Fujisawa