Speaker
Antonio Batista
(Instituto de Plasmas e Fusão Nuclear)
Description
The main objective of this work is to demonstrate that a digital integrator based on the chopper modulation concept is capable of meeting the ITER requirements. The ITER magnetics diagnostic requires a maximum drift of 500 uV.s/hour, among other specifications, for the respective signal integrators. As of today, known COTS integrator modules do not fully comply simultaneously with all ITER requirements. A chopper design, implemented by IPFN based on a W7-X concept, was used as a starting point for the presented developments. The suitability of this integrator module for use on ITER was previously tested by IPFN and several issues were identified. New designs were subsequently developed in order to correct these problems or identify their causes. A first phase of prototyping, presented in this work, comprises the development and testing of 4 resulting design variants. Combinations of a SAR ADC (AD7960) and a Sigma-Delta ADC (ADS1675) with different analog front ends were used for the corresponding integrator prototypes. The designs have a common interface to an FPGA based system, developed by CCFE, that receives the acquired data and sends it through GbE to a PC for processing the signal integration. The GbE network acts as the interfacing medium for the tests, allowing connection of the integrator prototype to a permanent data storage MDSplus environment. The integrator prototype designs and tests done so far will be presented.
This work was funded by F4E via contracts F4E-OPE-442 and F4E-OPE_361-08. The views expressed herein are the sole responsibility of the authors and don't necessarily reflect the views of F4E or the ITER Organization. Neither F4E nor any person acting on behalf of F4E is responsible for the use, which might be made, of the information contained herein.
The views and opinions expressed herein do not necessarily reflect those of the ITER Organization.
Co-authors
Adam Stephen
(CCFE, Culham Science Centre, Abingdon, Oxon, OX14 3DB, United Kingdom)
Andre Neto
(Fusion for Energy, 08019 Barcelona, Spain)
Antonio Batista
(Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal)
Bernardo Carvalho
(Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal)
Bruno Goncalves
(Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal)
Filippo Sartori
(Fusion for Energy, 08019 Barcelona, Spain)
George Vayakis
(ITER Organization, Route de Vinon-sur-Verdon, CS 90 046, 13067 St. Paul Lez Durance Cedex, France)
Graham Naylor
(CCFE, Culham Science Centre, Abingdon, Oxon, OX14 3DB, United Kingdom)
Isidro Bas
(GTD Sistemas de Informacion, 08005 Barcelona, Spain)
Jorge Sousa
(Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal)
Llorenc Negre
(Indra Sistemas S.A, 28108 Alcobendas, Madrid, Spain)
Luca Zabeo
(ITER Organization, Route de Vinon-sur-Verdon, CS 90 046, 13067 St. Paul Lez Durance Cedex, France)
Roberto Campagnolo
(Fusion for Energy, 08019 Barcelona, Spain)
Shakeib Arshad
(Fusion for Energy, 08019 Barcelona, Spain)
Stefan Simrock
(ITER Organization, Route de Vinon-sur-Verdon, CS 90 046, 13067 St. Paul Lez Durance Cedex, France)
Stephanie Hall
(CCFE, Culham Science Centre, Abingdon, Oxon, OX14 3DB, United Kingdom)
