A5038889875- Gyrotron and Vacuum Electronics Research
- Atmospheric aerosols and clouds
- Microwave Engineering and Waveguides
- Precipitation Measurement and Analysis
- Meteorological Phenomena and Simulations
- Ionosphere and magnetosphere dynamics
- Atmospheric Ozone and Climate
- Particle accelerators and beam dynamics
- Solar and Space Plasma Dynamics
- Dark Matter and Cosmic Phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Aeolian processes and effects
- Soil Moisture and Remote Sensing
- Terahertz technology and applications
- Electrostatic Discharge in Electronics
- Icing and De-icing Technologies
- Particle physics theoretical and experimental studies
- Computational Physics and Python Applications
- Atmospheric chemistry and aerosols
- Cosmology and Gravitation Theories
Jet Propulsion Laboratory
2023-2024
Lancaster University
2018-2023
Instituto de Física de Cantabria
2022
The development of radar systems operating at G-band (110 - 300 GHz) with small size, weight, and power requirements can offer new possibilities for probing clouds precipitation from space lead to novel mission concepts. To advance the technology needed achieve such objective, a ground-based Doppler prototype atmospheric profiling has been developed demonstrated different targets. This article describes architecture discusses instrument calibration reflectivity velocity measurements precipitation.
We propose a novel experiment, the Canfranc Axion Detection Experiment (CADEx), to probe dark matter axions with masses in range 330-460 $\mu$eV, within W-band (80-110 GHz), an unexplored parameter space well-motivated window of Quantum ChromoDynamics (QCD) axions. The experimental design consists microwave resonant cavity haloscope high static magnetic field coupled highly sensitive detecting system based on Kinetic Inductance Detectors via optimized quasi-optics (horns and mirrors)....
Abstract. Macrophysical properties of clouds are influenced by underlying microphysical processes. In practice, there is often an observational gap in bridging the two. For example, our current understanding aerosol-cloud interaction and cloud-climate feedback hindered a lack robust measurements distribution drop sizes within clouds, especially for smallest sizes. Doppler radar have proven useful estimating rainfall size distributions (DSDs) but face intermediate challenge requiring...
Abstract. The Eastern Pacific Cloud Aerosol Precipitation Experiment (EPCAPE) was a year-round campaign conducted by the US Department of Energy at Scripps Institution Oceanography in La Jolla, CA, USA, with focus on characterizing atmospheric processes coastal location. ground-based prototype new Ka-, W-, and G-band (35.75, 94.88, 238.8 GHz) profiling radar, named CloudCube, which developed Jet Propulsion Laboratory, took part experiment during 6 weeks March April 2023. This article...
Abstract. The profile of the liquid water content (LWC) in clouds provides fundamental information for understanding internal structure clouds, their radiative effects, propensity to precipitate, and degree entrainment mixing with surrounding environment. In principle, differential absorption techniques based on coincident dual-frequency radar reflectivity observations have potential provide LWC profile. Previous frequency (DFR) efforts were challenged by fact that measurable attenuation...
Meander lines are promising slow-wave structures (SWSs) for millimeter-wave traveling-wave tubes (TWTs) due to low-cost manufacture, low-voltage operation, and high interaction impedance. However, experimental results on meander rare in the literature. Phase velocity impedance most important parameters design characterization of TWT SWSs. Their determination is crucial validating simulations developing new topologies. Based a theoretical model, this article presents an procedure determine...
Secondary electron emission has an important role on the triggering of multipactor effect; therefore, its study and characterization are essential in radio-frequency waveguide applications. In this paper, we propose a theoretical model, based equivalent circuit models, to properly understand charging discharging processes that occur dielectric samples under irradiation for secondary characterization. Experimental results obtained Pt, Si, GaS, Teflon presented verify accuracy proposed model....
The unfeasible fabrication of helix slow wave structures in W-band traveling tubes makes necessary to find alternative order amplify the RF signal output levels required overcome atmospheric attenuation satellite communications. Meander lines are nowadays being studied as for due their favorable properties compared full metal alternatives. A novel meander line topology is introduced this work, showing that high gain and power can be achieved using a low-voltage electron beam. Cold large...
Abstract. The Eastern Pacific Cloud Aerosol Precipitation Experiment (EPCAPE) is a year-round campaign conducted by the US Department of Energy at Scripps Oceanographic Institute in La Jolla, CA, USA, with focus on characterizing atmospheric processes coastal location. A new Ka, W and G-band (35.75, 94.88 238.8 GHz) profiling radar, named CloudCube, developed Jet Propulsion Laboratory, took part experiment during six weeks March April, 2023. This article describes unique data sets that were...
Abstract. The profile of the liquid water content (LWC) in clouds provides fundamental information for understanding internal structure clouds, their radiative effects, propensity to precipitate, and degree entrainment mixing with surrounding environment. In principle, differential absorption techniques based on coincident dual-frequency radar reflectivity (DFR) observations have potential provide LWC profile. Previous DFR efforts were challenged by fact that measurable attenuation small...
Fabrication of sub-THz slow wave structures usually requires expensive high precision equipment.A low cost fabrication method for the double corrugated waveguide at frequencies is proposed.The use cutting machine permits to quickly produce square pillars with dimensions in range hundreds microns or smaller good precision.A has been simulated G-band (275 -305 GHz) geometry modification keep into account profile produced by wheel.A first sample cross section 70 x using demonstrated.The...
A new meander line topology for 71-76 GHz Traveling Wave Tubes is proposed. This shape offers flatter dispersion relation and enhanced interaction impedance in comparison with the standard line. Results of over beam cross section effect a line-to-waveguide coupler are also analyzed this work.
The low beam voltage operation and the simple fabrication of meander lines make them a promising slow wave structure for production novel low-cost traveling tubes W-band satellite communications. However, poor interaction planar structures with cylindrical has led to investigation alternative line configurations that could improve their performance. A based on adding pillars improving electron is described. Simulations cold parameters large signal behavior are presented in paper.
Satellite distribution of high data rate needs wide frequency band. The millimeter waves, in particular the W-band, provide bandwidth and relatively low attenuation. link transmission power can be provided only by Traveling Wave Tubes (TWTs). A new meander line topology to used as slow wave structure for 71-76 GHz TWTs, with improved performance comparison conventional one, is proposed. compared a standard shows flatter gain higher output power.
Planar meander lines have been recently studied in detail due to their favorable properties as slow wave structures for traveling tubes. However, the interaction of a cylindrical electron beam with this kind is not efficient enough order achieve output power levels required space applications at W-band. A new design, suitable and optimized geometry, introduced work. Cold large signal results are presented paper.
We propose a novel experiment, the Canfranc Axion Detection Experiment (CADEx), to probe dark matter axions with masses in range 330-460 $μ$eV, within W-band (80-110 GHz), an unexplored parameter space well-motivated window of Quantum ChromoDynamics (QCD) axions. The experimental design consists microwave resonant cavity haloscope high static magnetic field coupled highly sensitive detecting system based on Kinetic Inductance Detectors via optimized quasi-optics (horns and mirrors)....
Meander lines have been lately studied as slow wave structures (SWSs) for millimeter-wave traveling tubes (TWTs) given their numerous benefits such low beam voltage, high interaction impedance and straightforward manufacture. They are seen a very promising candidate new generation of low-cost TWTs. The efforts now focused on finding novel meander line configurations that could improve the overall performance TWT. This paper analyses effect material underneath substrate presents different...