Measurement of BAAE and RSAE Mode Structures

with high-k Scattering System

Woochang Lee

High-k Scattering System

• 280 GHz (=1 mm) scattering system

• 5 detection channels (5 discrete k┴)

• Can cover arbitrary radial position from ~105 cm to ~145 cm

• The scattering volume is spatially localized (w = 3 cm, Lz = ~ 5 cm)

• Sensitive to the radial fluctuation

• Will be absolutely calibrated soon

BAAE in NSTX

N. Gorelenkov 07XP

r/a = 0.7 (R ~ 132 cm)

Bt = 4.5 kG

P_NBI = 2 MW

BAAE (n=2)

RSAE in NSTX

H. Yuh 07XP

R = 120 cm

Bt = 5.5 kG

P_NBI = 2 MW

Mode structure of RSAE(R=120cm) (R=110cm)

Radial Structure of BAAE by USXR

APS07 poster of

N. Gorelenkov

Radial Structure of BAAE by Reflectometer

APS07 poster of

N. Gorelenkov

Experiment Plan

• Obtain high-k scattering data at 8~9 R-positions from ~115 cm to ~145 cm for several plasma conditions.

Need 7 control access to change launching mirror angle

BAAE of 123816

high-k channel

low-k channel

RSAE of 123816

high-k channel

low-k channel