Author:
Marinoni A.,Rost J.C.,Porkolab M.
Abstract
Abstract
The PCI diagnostic is an internal reference interferometer that creates an image of
absolutely calibrated electron density fluctuations integrated along the line of sight of the
probing light beam. While conventional PCI diagnostics installed on fusion experiments worldwide
employ light of wavelength equal to 10.59 μm, the same system using light at 1.55 μm
wavelength would extend the spectral response in wave-number and frequency by factors of seven and
over one hundred, respectively, thereby potentially providing quantitative measurements of the
internal structure of density perturbations induced by either turbulent or radio-frequency waves,
simultaneously covering ion to electron gyro-radius scales up to the GHz frequency region. Based
on a previously developed 1.55 μm PCI prototype system, constraints to the design for such a
diagnostic in fusion grade devices are presented and compared to those faced with the conventional
method.
Subject
Mathematical Physics,Instrumentation