R. Padilla
A5072256966- Radiation Detection and Scintillator Technologies
- Particle Detector Development and Performance
- Radiation Effects in Electronics
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Gyrotron and Vacuum Electronics Research
- Diamond and Carbon-based Materials Research
- Atomic and Subatomic Physics Research
- Fire Detection and Safety Systems
- Fire effects on ecosystems
- Lightning and Electromagnetic Phenomena
- Advancements in PLL and VCO Technologies
- Plasma Diagnostics and Applications
- Particle physics theoretical and experimental studies
- CCD and CMOS Imaging Sensors
- Electronic and Structural Properties of Oxides
University of California, Santa Cruz
2020-2024
Universidad Central "Marta Abreu" de las Villas (UCLV)
2023
Chinese Academy of Sciences
2020
Universitat Autònoma de Barcelona
2020
Institute for High Energy Physics
2020
University of Chinese Academy of Sciences
2020
Institute of High Energy Physics
2020
Fermi National Accelerator Laboratory
1990-2006
The properties of 50 um thick Low Gain Avalanche Diode (LGAD) detectors manufactured by Hamamatsu photonics (HPK) and Fondazione Bruno Kessler (FBK) were tested before after irradiation with 1 MeV neutrons. Their performance measured in charge collection studies using b-particles from a 90Sr source capacitance-voltage scans (C-V) to determine the bias deplete gain layer. Carbon infusion layer sensors was FBK UFSD3 production. HPK instead produced LGADs very thin, highly doped deep...
Ultra-Fast Silicon Detectors (UFSDs) are n-in-p silicon detectors that implement moderate gain (typically 5 to 25) using a thin highly doped p++ layer between the high resistivity p-bulk and junction of sensor. The presence allows excellent time measurement for impinging minimum ionizing charged particles. An important design consideration is sensor thickness, which has strong impact on achievable resolution. We present result measurements LGADs thickness 20 micro-m 50 micro-m. data fit...
Needs arising at both current and future accelerator facilities call for the development of radiation-hardened position-sensing diagnostics that can operate with multi-GHz repetition rates. Such instruments are likely to also have applications in diagnosis rapid plasma behavior. Building on recent work our Advanced Accelerator Diagnostics Collaboration, we exploring integrated ionizing particle detection systems based chemical-vapor deposition diamond sensors, initial goal producing a...
Abstract Being an excellent radiation hard material, diamond is preferred as ionizing sensor in harsh environments. In this study, damage from a beam of 67.5 MeV protons at the Crocker Nuclear Laboratory on campus University California, Davis, was used to determine exposure lifetime detectors made thinned (∼ 40 μ m) monocrystalline CVD (chemical vapor deposition) substrate. The response sampled real time exposed total fluence ∼ 4×10 16 / cm 2 , yielding overall constant k = (3.3 ± 0.3) × 10...
Next generation Low Gain Avalanche Diodes (LGAD) produced by Hamamatsu photonics (HPK) and Fondazione Bruno Kessler (FBK) were tested before after irradiation with ~1MeV neutrons at the JSI facility in Ljubljana. Sensors irradiated to a maximum 1-MeV equivalent fluence of 2.5E15 N eq /cm 2 . The sensors analysed this paper are an improvement lessons learned from previous FBK HPK productions that already reported precedent papers. gain layer was fine-tuned optimize performance irradiation....
Low Gain Avalanche Detectors (LGADs) are thin silicon detectors with moderate internal signal amplification and time resolution as good 17 ps for minimum ionizing particles. However the current major limiting factor in granularity is due to protection structures preventing breakdown caused by high electric fields at edge of segmented implants. This structure, called Junction Termination Extension (JTE), causes a region 50-100 μm inactive space. Therefore, LGAD sensors currently limited mm...
The composition and performance of three different diamond sensor based pass-through diagnostics are presented. A position-sensitive quadrant was designed characterized using the XPP beam at SLAC LCLS, demonstrating a generated-charge resolution 0.025 pC position sensitivity 2 μm, measurable pulse-by-pulse repetition rate up to 50 MHz. compact signal path capable rates 1 GHz used characterize charge collection properties sensors as function density electron-hole pairs created within sensor,...
The fundamental theoretical aspects of protecting photovoltaic parks against lightning and overvoltages. From an overview systems, attention is focused on their ability to generate electricity from solar radiation. Lightning, its occurrence, associated effects, such as electrical surges, are discussed below. Lightning effects in installations were examined, thermal, electrodynamic, combustion-related consequences described detail. Electric overvoltage was introduced, dividing it into...
A wider aperture, which has been obtained along the Booster beam line recently, brings opportunity to run beams with intensity higher than ever before. Sooner or later, available RF accelerating voltage will become a new limit for intensity. Extra voltages can be achieved either by increasing RFSUM reducing rate via slower acceleration, and this motivates 6-GeV study.
Low Gain Avalanche Detectors (LGADs) are a type of thin silicon detector with highly doped gain layer. LGADs manufactured by Fondazione Bruno Kessler (FBK) were tested before and after irradiation neutrons. In this study, the Inter-pad distances (IPDs), defined as width between pads, measured TCT laser system. The response was tuned using $\beta$-particles from 90Sr source. These insensitive "dead zones" created protection structure to avoid breakdown, Junction Termination Extension (JTE),...
The Module 1 side-coupled cavity with bridge couplers was given its final tuning during April 1990 in the low-level RF lab. pi /2 frequency power iris cut is 805.001 MHz. stop band +246 kHz. Driven at waveguide port, reflected -45 dB (VSWR=1.01). loaded Q 9544. individual cell field RMS deviation from average each section less than 1%. agrees theoretical value calculated. peak decreases 0.5% over module length due to gap spacing as beta increases. four sections were checked a single...