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Optimized collimator design and synthetic signals for the ITER Fast Ion Loss Detector.

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Title: Optimized collimator design and synthetic signals for the ITER Fast Ion Loss Detector.
Authors: Reyner-Viñolas, A1 (AUTHOR) areyner@us.es, Gonzalez-Martin, J2 (AUTHOR), Galdon-Quiroga, J1 (AUTHOR), Snicker, A3 (AUTHOR), Marques, R2 (AUTHOR), Hyvärinen, O4 (AUTHOR), Peña-Arevalo, D1 (AUTHOR), Sanchis, L1 (AUTHOR), Jimenez-Comez, M1 (AUTHOR), Rueda-Rueda, J5 (AUTHOR), Garcia-Muñoz, M1 (AUTHOR), Kocan, M6 (AUTHOR)
Source: Plasma Physics & Controlled Fusion. 2026, Vol. 68 Issue 4, p1-19. 19p.
Subjects: Collimators, Signal-to-noise ratio, Synthetic data, Simulation methods & models
Abstract: An improved geometry for the ITER Fast Ion Loss Detector (FILD) (i.e. Lost Alpha Monitor) collimator has been optimized to maximize the signal-to-noise ratio and resolution for the lost 3.5 MeV fusion-born alpha particles. A new optimization method has been developed to be able to study a broad range of geometries and ensure the best performance through the entire velocity-space of interest. The collimator now presents advanced shaping, fitting the helical trajectories of the ions. Synthetic diagnostic simulations have been conducted with the FILDSIM code to evaluate its performance. These simulations provide the main parameters of the diagnostic, including the gyroradius and pitch angle resolutions, and the collimator factor. Synthetic signals are computed from ASCOT ion distributions to evaluate the optic and data acquisition system of ITER. A scan of the FILD insertion has been performed to evaluate the ion flux at different measuring positions. The synthetic signals in this work show that the new collimator geometry enhances both collimation and resolution, ultimately improving the signal to noise ratio by ∼ 70 % . These simulations incorporate the latest update on the optical system and multiple sources of noise: scintillator noise generated by gamma and neutron fluxes, camera-induced noise, neutronic noise on the camera sensor, optic transmission and field of view, and distortion due to the optical system. [ABSTRACT FROM AUTHOR]
Copyright of Plasma Physics & Controlled Fusion is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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Header DbId: egs
DbLabel: Engineering Source
An: 192699089
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Optimized collimator design and synthetic signals for the ITER Fast Ion Loss Detector.
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  Data: <searchLink fieldCode="AR" term="%22Reyner-Viñolas%2C+A%22">Reyner-Viñolas, A</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> areyner@us.es</i><br /><searchLink fieldCode="AR" term="%22Gonzalez-Martin%2C+J%22">Gonzalez-Martin, J</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Galdon-Quiroga%2C+J%22">Galdon-Quiroga, J</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Snicker%2C+A%22">Snicker, A</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Marques%2C+R%22">Marques, R</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hyvärinen%2C+O%22">Hyvärinen, O</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Peña-Arevalo%2C+D%22">Peña-Arevalo, D</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sanchis%2C+L%22">Sanchis, L</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jimenez-Comez%2C+M%22">Jimenez-Comez, M</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Rueda-Rueda%2C+J%22">Rueda-Rueda, J</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Garcia-Muñoz%2C+M%22">Garcia-Muñoz, M</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kocan%2C+M%22">Kocan, M</searchLink><relatesTo>6</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Plasma+Physics+%26+Controlled+Fusion%22">Plasma Physics & Controlled Fusion</searchLink>. 2026, Vol. 68 Issue 4, p1-19. 19p.
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  Data: An improved geometry for the ITER Fast Ion Loss Detector (FILD) (i.e. Lost Alpha Monitor) collimator has been optimized to maximize the signal-to-noise ratio and resolution for the lost 3.5 MeV fusion-born alpha particles. A new optimization method has been developed to be able to study a broad range of geometries and ensure the best performance through the entire velocity-space of interest. The collimator now presents advanced shaping, fitting the helical trajectories of the ions. Synthetic diagnostic simulations have been conducted with the FILDSIM code to evaluate its performance. These simulations provide the main parameters of the diagnostic, including the gyroradius and pitch angle resolutions, and the collimator factor. Synthetic signals are computed from ASCOT ion distributions to evaluate the optic and data acquisition system of ITER. A scan of the FILD insertion has been performed to evaluate the ion flux at different measuring positions. The synthetic signals in this work show that the new collimator geometry enhances both collimation and resolution, ultimately improving the signal to noise ratio by ∼ 70 % . These simulations incorporate the latest update on the optical system and multiple sources of noise: scintillator noise generated by gamma and neutron fluxes, camera-induced noise, neutronic noise on the camera sensor, optic transmission and field of view, and distortion due to the optical system. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Plasma Physics & Controlled Fusion is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1088/1361-6587/ae5339
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        Text: English
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        PageCount: 19
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    Subjects:
      – SubjectFull: Collimators
        Type: general
      – SubjectFull: Signal-to-noise ratio
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      – SubjectFull: Synthetic data
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      – SubjectFull: Simulation methods & models
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              Text: 2026
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