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| To submit an experimental proposal, please use [https://forms.gle/aNHbrRyVjpQS7MJt7 this form]. | | To submit an experimental proposal, please use [https://forms.gle/aNHbrRyVjpQS7MJt7 this form]. |
| The table below is updated manually by the campaign management. | | The table below is updated manually by the campaign management. |
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| Proposal title and proponents
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| Title: Turbulence studies of the PiEC phase with Spectral Gas Puff Imaging (SGPI) and HIBP diagnostics in the TJ-II stellarator
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| Main proponent (Surname, Name): I. García-Cortés
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| Main proponent's affiliation: CIEMAT
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| Main proponet's ORCID: 0000-0002-5223-391X
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| Other proponents (Name Surname (Affiliation), comma separated list): B. van Milligen, E. de la Cal, S. Barquero, K. Mc Carthy and HIBP-Team.
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| Funding Project (If your participation at TJ-II is supported by any national or international fuding project or entity, please refer to it here): PID2023-148697OB-I00
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| External proposal (Yes/no Select 'Yes' if the main proponent is not affiliated to CIEMAT): No
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| Main physics area
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| Transport and confinement
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| Specific objectives of the experiment (500 characters max.):
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| Transport mechanisms during the pellet-induced enhanced confinement (PiEC) phase in TJ-II remain unclear: the core is largely neoclassical, while gradient and edge regions are turbulence-dominated and transport barrier formation seems essential for this phase. Our aim is to investigate edge turbulence during the PiEC phase. This is done with SGPI (0.75 < ρ < 1) to study turbulence and its role in the formation and evolution of the edge transport barrier, complemented by HIBP measurements for the core.
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| Approach and methodology (1000 characters max.):
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| The PiEC phase is created by injecting a single large pellet that passes through the magnetic axis (on-axis) during the NBI phase. Once reproducible and stable discharges are achieved, SGPI is used to characterize edge turbulence (0.75 < ρ < 1). Multiple discharges are needed to ensure that the PiEC regime is maintained despite helium injection for SGPI operation (trade-off between gas puff size and light signal levels). In parallel, HIBP systems will characterize turbulence and transport in the plasma core, thus allowing a comprehensive analysis of edge–core coupling and transport mechanisms. A single magnetic configuration is required, 100_44_65 or 100_48_65. Single on-axis pellet injections are needed to produce the PiEC phase. Off-axis injections are performed for comparison purposes.
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| Number of experiment days required (1 day ~ 30 shots) 1-4: 3
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| Fuelling and operation requirements
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| NBI heating
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| Hydrogen pellet injection
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| Special heating requirements
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| NBI2
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| Essential diagnostics
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| (Thomson Scattering
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| Heavy Ion Beam Probe
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| Langmuir probes
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| CXR spectroscopy
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| MSE spectroscopy
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| Helium beam
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| Spectroscopic Gas Puff Imaging
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| Fast visible camera
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| Fast ion loss detector
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| Zeff profile (scanner system)
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| Neutral particle analyser
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| SXR multifilter):
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| Magnetic configuration: 100_44_65 or 100_48_65
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| Optional magnetic configuration specifications:
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| Is the proposals part of ...? NO
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| Remote participation required?NO
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| Any other relevant information
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| == Important documents == | | == Important documents == |