H. Trimiño Mora
A5007940574- Magnetic confinement fusion research
- Laser-Plasma Interactions and Diagnostics
- Particle accelerators and beam dynamics
- Fusion materials and technologies
- Laser-induced spectroscopy and plasma
- Plasma Diagnostics and Applications
- Gaussian Processes and Bayesian Inference
- Ionosphere and magnetosphere dynamics
- Calibration and Measurement Techniques
- Astronomical Observations and Instrumentation
- Superconducting Materials and Applications
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Atomic and Subatomic Physics Research
- Gyrotron and Vacuum Electronics Research
- Fault Detection and Control Systems
- Simulation Techniques and Applications
- Laser Design and Applications
- Atomic and Molecular Physics
- Medical Coding and Health Information
- X-ray Spectroscopy and Fluorescence Analysis
- Adaptive optics and wavefront sensing
- Target Tracking and Data Fusion in Sensor Networks
- Spectral Theory in Mathematical Physics
- Quantum chaos and dynamical systems
Max Planck Institute for Plasma Physics - Greifswald
2016-2024
Max Planck Institute for Plasma Physics
2015-2021
Max Planck Society
2015-2020
University of Rostock
2018
Australian National University
2016
Oak Ridge National Laboratory
2016
Physikalisch-Technische Bundesanstalt
2016
University of Opole
2016
CEA Cadarache
2016
National Institute for Fusion Science
2016
After completing the main construction phase of Wendelstein 7-X (W7-X) and successfully commissioning device, first plasma operation started at end 2015. Integral start-up using electron cyclotron resonance heating (ECRH) an extensive set diagnostics have been completed, allowing initial physics studies during operational campaign. Both in helium hydrogen, breakdown was easily achieved. Gaining experience with vessel conditioning, discharge lengths could be extended gradually. Eventually,...
The first physics operation phase on the stellarator experiment Wendelstein 7-X was successfully completed in March 2016 after about 10 weeks of operation. Experiments this were conducted with five graphite limiters as primary plasma-facing components. Overall, results beyond expectations published shortly before start [Sunn Pedersen et al., Nucl. Fusion 55, 126001 (2015)] both respect to parameters reached and themes addressed. We report here some most important plasma experiments that...
Interferometry as one of the most common core fusion diagnostics has traditionally suffered from incomplete vibration compensation. Dispersion interferometry promises a more complete compensation vibrations. For this reason it is being employed in an increasing number experiments. However, thus far none them have shown reliable real-time low-latency processing dispersion data. Nonetheless necessity for machines when trying to do density feedback control, notably long discharges like ones...
The optimized stellarator Wendelstein 7-X started operation in December 2015 with a 10 week limiter campaign. Divertor experiments will begin the second half of 2017. W7-X Thomson scattering system is an essential diagnostic for electron density and temperature profiles. In this paper described detail, including its design, calibration, data evaluation first experimental results. Plans further development are also presented. Nd:YAG setup up to five lasers, two sets light collection lenses...
For stellarators, which need no or only small amounts of current drive, electron-cyclotron-resonance heating (ECRH) is a promising method even for the envisaged application in fusion power plant. Wendelstein 7-X (W7-X) equipped with steady-state capable ECRH system, operating at 140 GHz, corresponds to 2nd cyclotron harmonic electrons magnetic field 2.5 T. Ten gyrotrons are operational and already delivered 7 MW W7-X plasmas. Combined pellet injection, highest triple product (0.68 × 1020 keV...
The transport of heavy impurities has been investigated at the Wendelstein 7-X stellarator during core electron root confinement (CERC) experiments. Iron atoms were injected via laser blow-off technique and analyzed by VUV x-ray spectrometers. amount iron does not change global plasma parameters but yields strong enough line radiation for detailed studies based on impurity code STRAHL. latter is supplied with neo-classical diffusion convection profiles from drift kinetic equation solver...
Wendelstein 7-X, a superconducting optimized stellarator built in Greifswald/Germany, started its first plasmas with the last closed flux surface (LCFS) defined by 5 uncooled graphite limiters December 2015. At end of 10 weeks long experimental campaign (OP1.1) more than 20 independent diagnostic systems were operation, allowing detailed studies many interesting plasma phenomena. For example, fast neutral gas manometers supported video cameras (including one fast-frame camera frame rates...
The main objective of the Wendelstein 7-X (W7-X) stellarator is to demonstrate integrated reactor potential optimized line. An important element this mission achievement high heating-power and confinement in steady-state operation. Such an plasma operation has not yet been demonstrated represents major scientific goal W7-X. way towards staged. In first phase, called OP 1.1, December 2015-March 2016, a limiter configuration was used. paper, preparation phase as well lessons learned during...
During the first operational phase (OP 1.1) of Wendelstein 7-X (W7-X) electron cyclotron resonance heating (ECRH) was exclusive method and provided plasma start-up, wall conditioning, current drive. Six gyrotrons were commissioned for OP1.1 used in parallel operation with a power up to 4.3 MW. standard X2-heating spatially localized deposition high density allowed controlling radial profiles temperature rotational transform. Even though W7-X not fully equipped tiles operated graphite limiter...
Observations on confinement in the first experimental campaign optimized Stellarator Wendelstein 7-X are summarized. In this phase W7-X was equipped with five inboard limiters only and thus discharge length restricted to avoid local overheating. Stationary plasmas limited low densities <2–3 · 1019 m−3. With available 4.3 MW ECR Heating core Te ~ 8 keV, Ti 1–2 keV achieved routinely resulting energy time τE between 80 ms 150 ms. For these conditions show characteristics of electron root...
Abstract Intrinsic, diffusion-driven toroidal (bootstrap) currents between −7 and 17 kA were measured in the optimised stellarator Wendelstein 7-X (W7-X) for several magnetic configurations at line-integrated plasma densities 2 × 10 19 1.6 20 m −2 heating powers 0.5 6 MW. The sign of bootstrap current changes with field reversal, its magnitude decreases mirror term rotational transform configuration as well density, increases power. Both absolute values dependencies agree neoclassical...
Global confinement properties of the limiter plasmas first operational campaign W7-X are investigated with special focus on energy and possible limits. The time was found to be close expectations from empirical ISS04 scaling for stellarators. Absolute values up were achieved. This can considered as a great success initial operation device. However, clear degradation performance observed when radiative losses became significant, which typically case at low heating power. While significant...
In nuclear fusion research, the effective ion charge Zeff, which characterizes overall content of impurities, can be experimentally derived from plasma electron–ion bremsstrahlung, given electron density ne and temperature Te. At Wendelstein 7-X, a multichannel near-infrared spectrometer is installed to collect bremsstrahlung along 27 lines sight covering more than half cross section, provides information on Zeff over entire radius. To infer spatially resolved profiles, Bayesian model...
Inverse problems in plasma physics commonly face a tradeoff between approximated real-time schemes or post-processed rigorous uncertainty handling. Bayesian analysis allows parameter and estimation as well joint of multiple diagnostics strict mathematical way. It also improves the inference from correlated measurements but with long processing times. For linear non-linear problems, many optimal sub-optimal online algorithms are available generally targeted at dynamic systems introducing some...
Abstract Inference of electron density and temperature has been performed using multiple, diverse sets plasma diagnostic data at Wendelstein 7-X. Predictive models for the interferometer, Thomson scattering helium beam emission spectroscopy (He-BES) systems have developed within Minerva framework integrated into a unified model. Electron profiles are modelled Gaussian processes. Calibration factors system predictive uncertainties considered as additional unknown parameters. The joint...
A heavy ion beam probe (HIBP) diagnostic is being developed for studies of plasma equilibrium and turbulence in the optimized Wendelstein 7-X (W7-X) stellarator. Operation W7-X has experimentally demonstrated that its magnetic field results improved neoclassical particle confinement and, as a result, predominant cause energy transport. The HIBP will have unique ability to provide experimental data needed complement models both turbulent It acquire direct measurements interior electric...
Electron cyclotron heating (ECH) is one of the most common methods used for stellarator plasmas, providing both ionization startup and net-current free during discharge. This paper presents design ECH system Stellarator Costa Rica (SCR-1), a small modular under construction at Instituto Tecnológico de (ITCR). The SCR-1 (Major radius 0.238 m, mean plasma 0.042 m) low budget device, using 2 period magnetic field with flat rotational transform profile (ı=0.3), resonant strength 8.78 × 10 <sup...
This article describes the current state of design heavy ion beam probe (HIBP) for Wendelstein 7-X (W7-X). It will be first HIBP diagnostic on an optimized stellarator and is designed to study electric fields scale turbulence in all W7-X reference magnetic configurations. The use existing 2 MV accelerator, located outside torus hall, results need a circuitous primary beamline. increases complexity optics deliver focused plasma. To access most configuration space W7-X, secondary beamline...
A general solution for dealing with parameter estimation in a rigorous way is Bayesian data analysis. This analysis allows of specific parameters and their uncertainties non-linear inverse problems strictly mathematical way. Though advantageous, it computationally intensive long processing times therefore, exceptions such as the Kalman filter linear systems Gaussian noise, its full not commonly used real-time applications. For problems, there are many suboptimal online algorithms using...
Consistent inference of the electron density and temperature has been carried out with multiple heterogeneous plasma diagnostic data sets at Wendelstein 7-X. The predictive models interferometer, Thomson scattering helium beam emission spectroscopy systems have developed in Minerva framework combined to a single joint model. profiles are modelled by Gaussian processes their hyperparameters. model parameters such as calibration factor system uncertainties regarded additional unknown...