The Digital Mirror Langmuir Probe: Field Programmable Gate Array Implementation of Real-Time Langmuir Probe Biasing (doi:10.7910/DVN/NSDWFZ)

View:

Part 1: Document Description
Part 2: Study Description
Part 5: Other Study-Related Materials
Entire Codebook

The Digital Mirror Langmuir Probe: Field Programmable Gate Array Implementation of Real-Time Langmuir Probe Biasing

doi:10.7910/DVN/NSDWFZ

Harvard Dataverse

2021-06-28

1

C. Vincent, W. McCarthy, T. Golfinopoulos, B. LaBombard, R. Sharples, J. Lovell, G. Naylor, S. Hall, J. Harrison, A.Q. Kuang, 2021, "The Digital Mirror Langmuir Probe: Field Programmable Gate Array Implementation of Real-Time Langmuir Probe Biasing", https://doi.org/10.7910/DVN/NSDWFZ, Harvard Dataverse, V1

The Digital Mirror Langmuir Probe: Field Programmable Gate Array Implementation of Real-Time Langmuir Probe Biasing

doi:10.7910/DVN/NSDWFZ

C. Vincent, W. McCarthy, T. Golfinopoulos, B. LaBombard, R. Sharples, J. Lovell, G. Naylor, S. Hall, J. Harrison, A.Q. Kuang

Harvard Dataverse

https://doi.org/10.7910/DVN/NSDWFZ

Physics, diagnostic techniques, diagnostic tools, FPGA, Langmuir probe, plasma

High bandwidth, high spatial resolution measurements of electron temperature, density and plasma potential are valuable for resolving turbulence in the boundary plasma of tokamaks. While conventional Langmuir probes can provide such measurements either their temporal or spatial resolution is limited: the former by the sweep rate necessary for obtaining I-V characteristics and the latter by the need to use multiple electrodes, as is the case in triple and double probe configurations. The Mirror Langmuir Probe (MLP) bias technique overcomes these limitations by rapidly switching the voltage on a single electrode cycling between three bias states, each dynamically optimised for the local plasma conditions. The MLP system on Alcator C-Mod used analog circuitry to perform this function, measuring Te, VF, and Isat at 1.1 MSPS. Recently, a new prototype digital MLP controller has been implemented on a Red Pitaya Field Programmable Gate Array (FPGA) board which reproduces the functionality of the original controller and performs all data acquisition. There is also the potential to provide the plasma parameters externally for use with feedback control systems. The use of FPGA technology means the system is readily customisable at a fraction of the development time and implementation cost. A second Red Pitaya was used to test the MLP by simulating the current response of a physical probe using C-Mod experimental measurements. This project is available as a git repository to facilitate extensibility (e.g. real-time control outputs, more voltage states) and scalability through collaboration.

<a href="http://library.psfc.mit.edu/catalog/reports/2010/19ja/19ja113/abstract.php">PSFC REPORT PSFC/JA-19-113</a><br /><br />This work was supported by the Massachusetts Institute of Technology (supported by US DoE cooperative agreement DE-SC0014264), and by the Engineering and Physical Sciences Research Council (EP/L01663X/1). This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 and 2019-2020 under grant agreement No 633053.

This dataset is made available without information on how it can be used. You should communicate with the Contact(s) specified before use.

Label:

19ja113_archival_manuscript.pdf

Text:

application/pdf

Label:

19ja113_fig4_data.h5

Text:

application/x-h5

Label:

19ja113_fig5a_data.h5

Text:

application/x-h5

Label:

19ja113_fig5b_data.h5

Text:

application/x-h5

Label:

19ja113_fig6_data.h5

Text:

application/x-h5

Label:

19ja113_fig7_data.h5

Text:

application/x-h5