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Ronchi, Emanuel
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Publications (10 of 30) Show all publications
Ronchi, E., Conroy, S., Andersson Sundén, E., Ericsson, G., Hellesen, C., Gatu Johnson, M., . . . Hjalmarsson, A. (2008). A Neural Networks Framework for Real-Time Unfolding of Neutron Spectroscopic Data at JET. Review of Scientific Instruments, 79(10), 10E513.
Open this publication in new window or tab >>A Neural Networks Framework for Real-Time Unfolding of Neutron Spectroscopic Data at JET
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2008 (English)In: Review of Scientific Instruments, ISSN 0034-6748, E-ISSN 1089-7623, Vol. 79, no 10, 10E513- p.Article in journal (Refereed) Published
Abstract [en]

A determination of fast ion population parameters such as intensity and kinetic temperature is important for fusion reactors. This becomes more challenging with finer time resolution of the measurements, since the limited data in each time slice cause increasing statistical variations in the data. This paper describes a framework using Bayesian-regularized neural networks (NNs) designed for such a task. The method is applied to the TOFOR 2.5 MeV fusion neutron spectrometer at JET. NN training data are generated by random sampling of variables in neutron spectroscopy models. Ranges and probability distributions of the parameters are chosen to match the experimental data. Results have shown good performance both on synthetic and experimental data. The latter was assessed by statistical considerations and by examining the robustness and time consistency of the results. The regularization of the training algorithm allowed for higher time resolutions than simple forward methods. The fast execution time makes this approach suitable for real-time analysis with a time resolution limit in the microsecond time scale.

National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-16763 (URN)10.1063/1.2953492 (DOI)000260573500095 ()
Note
JET-EFDA Contributors. Conference information: 17th Topical Conference High Temperature Plasma Diagnostics, May 2008, Albaquerque, New Mexico, USAAvailable from: 2008-06-05 Created: 2008-06-05 Last updated: 2017-12-08Bibliographically approved
Ronchi, E. (2008). Applications of neural networks for free unfolding of experimental data from fusion neutron spectrometers. In: Computational Intelligence in Decision and Control: Proceedings of the 8th International FLINS Conference, Madrid, Spain, 21-24 September 2008. Paper presented at 8th International FLINS Conference, Madrid, Spain, 21-24 September 2008. World Scientific Pub Co Inc.
Open this publication in new window or tab >>Applications of neural networks for free unfolding of experimental data from fusion neutron spectrometers
2008 (English)In: Computational Intelligence in Decision and Control: Proceedings of the 8th International FLINS Conference, Madrid, Spain, 21-24 September 2008, World Scientific Pub Co Inc , 2008Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
World Scientific Pub Co Inc, 2008
Series
World Scientific Proceedings Series on Computer Engineering and Information Science
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:uu:diva-109478 (URN)978-9812799463 (ISBN)
Conference
8th International FLINS Conference, Madrid, Spain, 21-24 September 2008
Available from: 2009-10-15 Created: 2009-10-15 Last updated: 2018-01-12Bibliographically approved
Andersson Sundén, E., Conroy, S., Ericsson, G., Gatu Johnson, M., Giacomelli, L., Hellesen, C., . . . Tardocchi, M. (2008). Evaluation of Spectral Unfolding for Neutron Spectroscopy. In: AIP Conference Proceedings 988 (pp. 315). .
Open this publication in new window or tab >>Evaluation of Spectral Unfolding for Neutron Spectroscopy
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2008 (English)In: AIP Conference Proceedings 988, 2008, 315- p.Conference paper, Published paper (Refereed)
Identifiers
urn:nbn:se:uu:diva-16773 (URN)
Note
International Workshop on Burning Plasma Diagnostics, September 2007, Varenna, ItalyAvailable from: 2008-06-05 Created: 2008-06-05 Last updated: 2017-01-25
Giacomelli, L., Hjalmarsson, A., Källne, J., Hellesen, C., Tardocchi, M., Goroni, G., . . . Weiszflog, M. (2008). Neutron Emission Spectroscopy Results for ITB and Mode Conversion ICRH Experiments at JET. In: Rev. Sci. Instr., submitted. .
Open this publication in new window or tab >>Neutron Emission Spectroscopy Results for ITB and Mode Conversion ICRH Experiments at JET
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2008 (English)In: Rev. Sci. Instr., submitted, 2008Conference paper, Published paper (Refereed)
Identifiers
urn:nbn:se:uu:diva-16765 (URN)
Note
17th Topical Conference High Temperature Plasma Diagnostics, May 2008, Albaquerque, New Mexico, USAAvailable from: 2008-06-05 Created: 2008-06-05 Last updated: 2017-01-25Bibliographically approved
Conroy, S., Weiszflog, M., Andersson Sundén, E., Ericsson, G., Gatu Johnson, M., Hellesen, C., . . . Sjöstrand, H. (2008). Neutron spectrometer for ITER using silicon detectors. In: Rev. Sci. Instr., submitted. .
Open this publication in new window or tab >>Neutron spectrometer for ITER using silicon detectors
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2008 (English)In: Rev. Sci. Instr., submitted, 2008Conference paper, Published paper (Refereed)
Identifiers
urn:nbn:se:uu:diva-16753 (URN)
Note
17th Topical Conference High Temperature Plasma Diagnostics, May 2008, Albaquerque, New Mexico, USAAvailable from: 2008-06-05 Created: 2008-06-05 Last updated: 2017-01-25
Ericsson, G., Andersson Sundén, E., Conroy, S., Gatu Johnson, M., Hellesen, C., Hjalmarsson, A., . . . Popovichev, S. (2008). Prospects for High Resolution Neutron Spectroscopy on High Power Fusion Devices in View of the Recent Diagnostic Developments at JET. In: AIP Conference Proceedings 988 (pp. 307). .
Open this publication in new window or tab >>Prospects for High Resolution Neutron Spectroscopy on High Power Fusion Devices in View of the Recent Diagnostic Developments at JET
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2008 (English)In: AIP Conference Proceedings 988, 2008, 307- p.Conference paper, Published paper (Refereed)
Identifiers
urn:nbn:se:uu:diva-16770 (URN)
Note
International Workshop on Burning Plasma Diagnostics, September 2007, Varenna, ItalyAvailable from: 2008-06-05 Created: 2008-06-05 Last updated: 2017-01-25
Gatu Johnson, M., Giacomelli, L., Hjalmarsson, A., Källne, J., Weiszflog, M., Andersson Sundén, E., . . . Popovichev, S. (2008). The 2.5-MeV neutron time-of-flight spectrometer TOFOR for experiments at JET. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 591(2), 417-430.
Open this publication in new window or tab >>The 2.5-MeV neutron time-of-flight spectrometer TOFOR for experiments at JET
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2008 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 591, no 2, 417-430 p.Article in journal (Refereed) Published
Abstract [en]

A time-of-flight (TOF) spectrometer for measurement of the 2.5-MeV neutron emission from fusion plasmas has been developed and put into use at the JET tokamak. It has been optimized for operation at high rates (TOFOR) for the purpose of performing advanced neutron emission spectroscopy (NES) diagnosis of deuterium plasmas with a focus on the fuel ion motional states for different auxiliary heating scenarios. This requires operation over a large dynamic range, including high rates of > 100 kHz with a maximum value of 0.5 MHz for the TOFOR design. This paper describes the design principles and their technical realization. The performance is illustrated with recent neutron TOF spectra recorded for plasmas subjected to different heating scenarios. A true event count rate of 39 kHz has been achieved at about a tenth of the expected neutron yield limit of JET, giving a projected maximum of 400 kHz at peak JET plasma yield. This means that the count rate capability for NES diagnosis of D plasmas has been improved more than an order of magnitude. Another important performance factor is the spectrometer bandwidth, where data have been acquired and analyzed successfully with a response function for neutrons over the energy range 1 to > 5 MeV. The implications of instrumental advancement represented by TOFOR are discussed.

National Category
Physical Sciences Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-16750 (URN)10.1016/j.nima.2008.03.010 (DOI)000257529700011 ()
Note

Conference Information: 21st IAEA Fusion Energy Conference Chengdu, PEOPLES R CHINA, OCT 16-21, 2006

Available from: 2008-06-05 Created: 2008-06-05 Last updated: 2017-12-08Bibliographically approved
Gatu Johnson, M., Giacomelli, L., Hjalmarsson, A., Weiszflog, M., Andersson Sundén, E., Conroy, S., . . . Tardocchi, M. (2008). The TOFOR Neutron Spectrometer for High Performance Measurements of D Plasma Fuel Ion Properties. In: AIP Conference Proceedings 988 (pp. 311). .
Open this publication in new window or tab >>The TOFOR Neutron Spectrometer for High Performance Measurements of D Plasma Fuel Ion Properties
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2008 (English)In: AIP Conference Proceedings 988, 2008, 311- p.Conference paper, Published paper (Refereed)
Identifiers
urn:nbn:se:uu:diva-16772 (URN)
Note
International Workshop on Burning Plasma Diagnostics, September 2007, Varenna, ItalyAvailable from: 2008-06-05 Created: 2008-06-05 Last updated: 2017-01-25
Giacomelli, L., Hellesen, C., Hjalmarsson, A., Sjöstrand, H., Källne, J., Conroy, S., . . . Weiszflog, M. (2007). Characterization of Phoswich Scintillation Detectors for the Focal Plane Hodoscope of Magnetic Proton Recoil Spectrometers for Fusion Neutrons. .
Open this publication in new window or tab >>Characterization of Phoswich Scintillation Detectors for the Focal Plane Hodoscope of Magnetic Proton Recoil Spectrometers for Fusion Neutrons
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2007 (English)Report (Other (popular scientific, debate etc.))
Identifiers
urn:nbn:se:uu:diva-13740 (URN)
Note
and JET EFDA contributors EFD-P(07)16Available from: 2008-06-05 Created: 2008-06-05 Last updated: 2017-01-25
Andersson Sundén, E., Conroy, S., Ericsson, G., Gatu Johnson, M., Giacomelli, L., Hellesen, C., . . . Tardocchi, M. (2007). Evaluation of Spectral Unfolding for Neutron Spectroscopy. .
Open this publication in new window or tab >>Evaluation of Spectral Unfolding for Neutron Spectroscopy
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2007 (English)Report (Other (popular scientific, debate etc.))
Identifiers
urn:nbn:se:uu:diva-13737 (URN)
Note
and JET EFDA contributors (EFD -C(07)04/10)Available from: 2008-06-05 Created: 2008-06-05 Last updated: 2017-01-25
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