NDLI: Upgrades to the Alcator C-Mod gas system

Content Provider	IEEE Xplore Digital Library
Author	Tesfaye, R. Burke, W.M. Dekow, G.L. Toland, T.L.
Copyright Year	2013
Description	Author affiliation: Plasma Sci. & Fusion Center Cambridge, Massachusetts Inst. of Technol., Cambridge, MA, USA (Tesfaye, R.; Burke, W.M.; Dekow, G.L.; Toland, T.L.)
Abstract	The C-Mod gas system includes eight piezoelectric valves for putting gas into the torus and instruments for monitoring gas pressure. During plasma operation, the gas system is responsible for initial fueling and real-time control of plasma density. It also handles injection of impurity gases for various diagnostics. Between shots and run days, the gas system is used for Electron Cyclotron Discharge Cleaning (ECDC) and boronization under the control of a programmable logic controller (PLC). Piezoelectric valves exhibit hysteresis and other non-linear behavior. On C-Mod the valve drivers incorporate pulse-start and pulse-width modulation to linearize valve operation. The drivers can be configured for seconds-long operation with realtime control or continuous operation over multiple days as in the case of ECDC. Interlocks for the system are implemented using the PLC while remote control is shared between the PLC and Digital Plasma Control System (DPCS). A Ratiomatic Ionization Gauge Controller has been designed to monitor torus pressure on a millisecond time scale. The nominal measurement range of the controller is $10^{-8}$ to $10^{-3}$ Torr, which covers base torus pressure, initial fueling, and plasma evolution. The design is based on the discontinued Varian 843 Controller and works with a Bayard-Alpert gauge placed inside the vacuum vessel. This design allows remote switching between two filaments and uses a microprocessor to control filament current and a PLC interface for remote control. Data from the gas system is digitized and stored in the C-Mod data system. This paper will discuss the main features and implementation of the gas system along with performance data.
Starting Page	1
Ending Page	4
File Size	297549
Page Count	4
File Format	PDF
e-ISBN	9781479901715
DOI	10.1109/SOFE.2013.6635390
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-06-10
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Valves Plasmas Microprocessors Monitoring Switches Time factors microprocessor vacuum fueling gas pressure CPLD
Content Type	Text
Resource Type	Article

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