TY - GEN
T1 - Real time control of the active MHD diagnostic on Alcator C Mod
AU - Burke, W.
AU - Cochran, W.
AU - Sears, J.
AU - Snipes, J.
AU - Wolfe, S.
AU - Zhong, X.
PY - 2005
Y1 - 2005
N2 - An Active MHD Diagnostic has been installed and operated on Alcator C-Mod to study Toroidal Alfvén Eigenmodes (TAEs). The diagnostic consists of two broadband amplifiers and two antennas which can excite stable modes in the TAE frequency range. The plasma response to this excitation is measured by existing magnetic fluctuation diagnostics. Analysis of the fluctuation data provides information about the TAE frequencies and damping rates as well as mode structure. The Active MHD diagnostic has evolved since its first operation in 2002, when it could only operate over a limited, preprogrammed frequency band. Recent improvements include automatic tuning to cover frequencies from 100 to 750 kHz, and an interface to the Alcator C-Mod Digital Plasma Control System (DPCS). The DPCS monitors plasma parameters, calculates the nominal TAE frequency, and adjusts the frequency input to the MHD amplifiers, all in real time. Now the Active MHD Diagnostic can measure TAEs over an entire plasma shot. This paper is focused on the requirements and design of the MHD Amplifiers, particularly the tuning bandwidth. It will also present some preliminary results from the recent run campaign.
AB - An Active MHD Diagnostic has been installed and operated on Alcator C-Mod to study Toroidal Alfvén Eigenmodes (TAEs). The diagnostic consists of two broadband amplifiers and two antennas which can excite stable modes in the TAE frequency range. The plasma response to this excitation is measured by existing magnetic fluctuation diagnostics. Analysis of the fluctuation data provides information about the TAE frequencies and damping rates as well as mode structure. The Active MHD diagnostic has evolved since its first operation in 2002, when it could only operate over a limited, preprogrammed frequency band. Recent improvements include automatic tuning to cover frequencies from 100 to 750 kHz, and an interface to the Alcator C-Mod Digital Plasma Control System (DPCS). The DPCS monitors plasma parameters, calculates the nominal TAE frequency, and adjusts the frequency input to the MHD amplifiers, all in real time. Now the Active MHD Diagnostic can measure TAEs over an entire plasma shot. This paper is focused on the requirements and design of the MHD Amplifiers, particularly the tuning bandwidth. It will also present some preliminary results from the recent run campaign.
UR - https://www.scopus.com/pages/publications/34547814240
UR - https://www.scopus.com/pages/publications/34547814240#tab=citedBy
U2 - 10.1109/FUSION.2005.252976
DO - 10.1109/FUSION.2005.252976
M3 - Conference contribution
AN - SCOPUS:34547814240
SN - 142440150X
SN - 9781424401505
T3 - Proceedings - Symposium on Fusion Engineering
BT - 21st IEEE/NPS Symposium on Fusion Engineering, SOFE'05
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 21st IEEE/NPS Symposium on Fusion Engineering, SOFE'05
Y2 - 26 September 2005 through 29 September 2005
ER -