Rockfield Research Inc.

Developed under a DOE SBIR for the MIT Alcator C-Mod Tokamak fusion experiment Lower Hybrid klystron array, the Transmitter Protection System is a flexible multi-tube control and fault monitoring system, housed in a cPCI format. Shown at left are the main (front) assembly (upper right and lower left), and the RTM I/O assembly (upper left and lower right).

The system services four klystrons, monitoring three current channels, two RF diode channels, and two waveguide arc channels per tube - with spare channels available. A realtime collector temperature predictor feature provides additional tube safety. Onboard emulation of ASQUIRT and DSQUIRT F/O expand the I/O fields considerably. A 96 bit event logger preserves all fault and control bit changes with us accuracy into a 2048 deep event memory.

As a generic control unit, it has sixteen current channel inputs, each buffered, routed to test points and digitizer outputs, and checked via three comparators (one remotely programmable for reference level). It has four pairs of RF diode inputs, all eight signals buffered and routed to digitizer input, with four ratiomatic fault comparators at programmable fault trip levels. Other features include twelve F/O coupled fault signal inputs and 30 additional F/O I/O channels for configurable control. I/O channels and comparators are routed through a matrix of 3 on-board ARM7 processors and two 100 pin CPLDs for maximum configurability and fault response speed.

Call Rockfield Research to discuss your application.

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ASQUIRT01 full-duplex F/O isolated analog transceiver (2 channel, 12 bit, 10 kHz) The ASQUIRT01 faithfully reproduces two analog channels in each direction across noise or voltage barriers with no galvanic connection in between. Checksums and ID codes maintain the integrity of the signals, and DIP switch selectable addressing ensures that multi-unit installations cannot operate on the wrong fiber. Default configuration: 2-pin LEMO connectors, 0-10V range. Other custom configurations possible. Contact Rockfield Research for further info & pricing.
ASQUIRT02 full-duplex F/O isolated analog transceiver (16 channel, 12 bit, 1 kHz) The ASQUIRT02 faithfully reproduces sixteen analog channels in each direction across noise or voltage barriers with no galvanic connection in between. Checksums and ID codes maintain the integrity of the signals, and DIP switch selectable addressing ensures that multi-unit installations cannot operate on the wrong fiber. Default configuration: D-sub 44pin connectors, 0-10V range, alt 0-20mA input option. Other configurations possible. Contact Rockfield Research for further info & pricing
	DSQUIRT02 full-duplex F/O isolated digital transceiver (32 channel, 5 kHz) The DSQUIRT02 family faithfully reproduces 32 digital channels (16 each way, 32 tx, or 32 rx) across noise or voltage barriers with no galvanic connection in between. Checksums and ID codes maintain the integrity of the signals, and DIP switch selectable addressing ensure that multi-unit installations cannot operate on the wrong fiber. I/O levels compatible with Allen Bradley PLC I/O, other configurations possible. Contact Rockfield Research for further info & pricing.
	TPS - Transmitter Protection System Developed under a DOE SBIR for the MIT Alcator C-Mod Tokamak fusion experiment Lower Hybrid klystron array, the Transmitter Protection System is a flexible multi-tube control and fault monitoring system, housed in a cPCI format. Shown at left are the main (front) assembly (upper right and lower left), and the RTM I/O assembly (upper left and lower right). The system services four klystrons, monitoring three current channels, two RF diode channels, and two waveguide arc channels per tube - with spare channels available. A realtime collector temperature predictor feature provides additional tube safety. Onboard emulation of ASQUIRT and DSQUIRT F/O expand the I/O fields considerably. A 96 bit event logger preserves all fault and control bit changes with us accuracy into a 2048 deep event memory. As a generic control unit, it has sixteen current channel inputs, each buffered, routed to test points and digitizer outputs, and checked via three comparators (one remotely programmable for reference level). It has four pairs of RF diode inputs, all eight signals buffered and routed to digitizer input, with four ratiomatic fault comparators at programmable fault trip levels. Other features include twelve F/O coupled fault signal inputs and 30 additional F/O I/O channels for configurable control. I/O channels and comparators are routed through a matrix of 3 on-board ARM7 processors and two 100 pin CPLDs for maximum configurability and fault response speed. Call Rockfield Research to discuss your application.