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In a world increasingly facing new challenges at the forefront of plasma scientific research and technological innovation, CNR and ISTP pledge progress and achieve an impact in the integration of research into societal practices and policy

WP 2 – Electromagnetic measurements and feedback control in RFX-mod2

RESEARCH UNIT: ISTP-Padova
WP LEADER: MATTEO BROMBIN

The activities envisaged within this WP are:

  • New front-end boards and acquisition systems for plasma control and machine protection 
  • Development of the RFXmod2 electromagnetic model to develop magnetic control and fault detection algorithms 
  • Development of a real time processor for machine protection and plasma control
  • In-house EMC Test Lab setup

GOALS

The most important expected outcomes from the activities foreseen within this Work Package are:

  • The design and manufacturing of a system that can perform numerical integration of signals collected by magnetic and electrical sensors in real-time. The system uses single isolated input ADC modules coupled to a commercially available System-On-Module (SOM) that integrates both FPGA and CPU. The FPGA handles ADC conversion and provides on-line functions including real-time numerical integration, derivative signal recording, and signal decimation for a lower frequency data stream (see Figure 1). The system also offers flexibility for more sophisticated triggering mechanisms and deeper integration with timing systems. This solution is essential for investigating the fluctuations of the magnetic field and developing advanced real-time algorithms to improve feedback control efficiency. Moreover, this system will implement a magnetic fault detection system that is compliant with the new RFX-mod2 device, considering both operational and machine modifications. In fact, the system is intended to provide more reliable machine protection, ensuring safe operation of the RFXmod2 in various plasma scenarios. Additionally, the system will enable real-time monitoring of electrodynamic forces acting on the device's windings during the entire plasma discharge, including fast terminations or disruptions. A possible structure for the 12-channel acquisition card, in 6U Eurocard format is shown in Figure 2.
  • Developing an electromagnetic model of RFXmod2, a Reverse Field Pinch machine which is an improvement of RFXmod, including the conducting structures both active and passive and the magnetic sensors, is a crucial step for the design of the real-time controller. This model will be used a) to specify algorithms for the calibration and the fault detection of the magnetic diagnostics, b) to evaluate electromagnetic forces on the conducting structures and c) to derive simplified control-oriented models.
  • The new control and protection software, which uses algorithms based on various plasma scenarios, will be capable of automatically identifying the appropriate intervention required for any faults, thereby eliminating the need for manual reconfiguration of machine protections for each plasma scenario. A unique and flexible architecture based on Linux Real-time that combines control and protection based on advanced algorithms will generate real-time commands to control the characteristics of the plasma.

The electromagnetic compatibility laboratory is crucial for this work package and will provide support for other work packages to ensure the success of electronic boards. A key goal of this activity is to perform immunity tests, which simulate electrical phenomena that electronic components may be exposed to during normal operation in their intended electromagnetic environment. By early identification of problems and eliminating interference sources, rising issues can be promptly fixed. This is essential in harsh environments such as fusion devices where control system failure is not permitted. Testing ensures that new electronics under development can function properly when used with current devices and systems in their shared operating environment.

Background

Electrical and magnetic measurements play a crucial role in the fields of magnetically confined fusion, plasma thrusters and particle accelerator experiments. These measurements are used in real-time to control and protect various machine systems and for data analysis required in physics studies. Sophisticated plasma control systems and algorithms are necessary to drive a large number of controllers to achieve the desired plasma scenarios. Real-time measurements from several diagnostics are necessary to provide the inputs to these controllers. EMC tests on electronics are also important to ensure the reliability of components and systems used in experiments. Having an in-house EMC "pre-compliance" laboratory is crucial to achieve the required reliability of electronic systems for diagnostics used in fusion devices. Testing the sensitivity to EM noise is also important troubleshooting without risking severe issues during the operation of diagnostics. 

WP TIMELINE

PHASE 1

Installation and final test of the new front end board for the magnetic and electrical sensors

PHASE 2

Final electromagnetic model of the RFXmod2 machine in Matlab/Simulink

PHASE 3

Commissioning of the real-time control software

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