Measurement of derivative of ion temperature using high spatial resolution charge exchange spectroscopy with space modulation optics.
A new technique to measure the first and second derivatives of the ion temperature profile has been developed by using a charge exchange spectroscopy system with space modulation optics. The space observed is scanned up to +/-3 cm with a cosine wave modulation frequency up to 30 Hz by shifting the object lens in front of the optical fiber bundle by 0.5 mm with a piezoelement. The first and second derivatives of ion temperature are derived from the modulation component of the ion temperature measured by using Fourier series expansion.
National Institute for Fusion Science, Toki 509-5292, Japan.
K
K
Ida
Y
Y
Sakamoto
M
M
Yoshinuma
S
S
Inagaki
T
T
Kobuchi
G
G
Matsunaga
Y
Y
Koide