A5020816228- Particle Detector Development and Performance
- Adaptive optics and wavefront sensing
- Radiation Detection and Scintillator Technologies
- CCD and CMOS Imaging Sensors
- Particle physics theoretical and experimental studies
- Spacecraft Design and Technology
- Particle Accelerators and Free-Electron Lasers
- Atmospheric chemistry and aerosols
- Nuclear Physics and Applications
- Atmospheric Ozone and Climate
- Astronomy and Astrophysical Research
- Mass Spectrometry Techniques and Applications
- Neutrino Physics Research
- Satellite Communication Systems
- Indoor Air Quality and Microbial Exposure
- Dark Matter and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Advanced Chemical Sensor Technologies
- Advanced X-ray Imaging Techniques
- Space Satellite Systems and Control
- Optical Systems and Laser Technology
- Spectroscopy and Laser Applications
- Atmospheric and Environmental Gas Dynamics
- Satellite Image Processing and Photogrammetry
- 3D IC and TSV technologies
Lawrence Livermore National Laboratory
2011-2024
Brookhaven National Laboratory
2023
Lawrence Berkeley National Laboratory
2002-2008
Michigan State University
2008
Uppsala University
2007
Stanford Synchrotron Radiation Lightsource
2007
SLAC National Accelerator Laboratory
2007
In nanotechnology, strategies for the creation and manipulation of nanoparticles in gas phase are critically important surface modification substrate-free characterization. Recent coherent diffractive imaging with intense femtosecond X-ray pulses has verified capability single-shot nanoscale objects at suboptical resolutions beyond radiation-induced damage threshold. By intercepting electrospray-generated particles a single 15 soft-X-ray pulse, we demonstrate specimen free flight first time,...
The Large Synoptic Survey Telescope (LSST) is a large aperture, wide-field facility designed to provide deep images of half the sky every few nights. There only single instrument on telescope, 9.6 square degree visible-band camera, which mounted close secondary mirror, and points down toward tertiary. requirements of the LSST camera present substantial technical design challenges. To cover entire 0.35 1 μm visible band, camera incorporates an array 189 over-depleted bulk silicon CCDs...
We present a design for 4 U (20 cm × 20 10 cm) occultation-viewing laser heterodyne radiometer (LHR) that measures methane (CH4), carbon dioxide (CO2) and water vapor (H2O) in the limb is designed deployment on 6 CubeSat. The LHR collects sunlight has undergone absorption by trace gas mixes it with distributive feedback (DFB) centered at 1640 nm scans across CO2, CH4, H2O features. Upper troposphere/lower stratosphere measurements of these gases provide key inputs to stratospheric...
Bioaerosol mass spectrometry (BAMS) performs single-cell analysis in real time. However, the specificity of BAMS signatures has been limited by low sensitivity at high masses. To increase range and BAMS, a novel design was developed that utilizes linear flight tube with delayed extraction an electrostatic ion guide. This study quantifies limits evaluates feasibility to detect higher biomarkers from single cells. All experiments were carried out using MALDI aerosol particles nebulized...
Actual or surrogate chemical, biological, radiological, nuclear, and explosive materials illicit drug precursors can be rapidly detected identified when in aerosol form by a Single-Particle Aerosol Mass Spectrometry (SPAMS) system. This entails not only the sampling of such particles but also physical analysis subsequent data leading to highly reliable alarm state. SPAMS hardware is briefly reviewed. software algorithms are discussed greater detail. A laboratory experiment involving actual...
Bioearosol mass spectrometry (BAMS) analyzes single particles in real time from ambient air, placing strict demands on instrument sensitivity. Modeling of the BAMS reflectron flight (TOF) with SIMION revealed design limitations associated ion transmission and sensitivity at higher masses. Design implementation a linear TOF electrostatic guide delayed extraction capabilities has greatly increased range relative to design. Initial experimental assessment new improved high masses as illustrated...
The LSST Camera science sensor array will incorporate 189 large format Charge Coupled Device (CCD) image sensors. Each CCD include over 16 million pixels and be divided into equally sized segments each segment read through a separate output amplifier. goals of the project require sensors with state art performance in many aspects. broad survey wavelength coverage requires fully depleted, 100 micrometer thick, high resistivity, bulk silicon as imager substrate. Image quality requirements...
The Space-based Telescopes for Actionable Refinement of Ephemeris (STARE) program will collect the information needed to help satellite operators avoid collisions in space by using a network nanosatellites determine more accurate trajectories selected objects orbiting Earth. In first phase STARE program, two pathfinder cube-satellites (CubeSats) equipped with an optical imaging payload are being developed and deployed demonstrate main elements concept. We give overview program. details...
Medium to large channel count detectors are usually faced with a few unattractive options for data acquisition (DAQ). Small medium-sized TPC experiments, example, too small justify the expense and development time of application specific integrated circuits (ASIC). Commercial rack mounted electronics bulky expensive counts. The combination commercial high-speed high-density FPGAs, ADCs, discrete components provides another option that scales tens thousands channels is only slightly larger...
The Space-based Telescopes for Actionable Refinement of Ephemeris (STARE) program will collect the information needed to help satellite operators avoid collisions in space by using a network nano-satellites determine more accurate trajectories selected objects orbiting Earth. In first phase STARE program, two pathfinder cube-satellites (CubeSats) equipped with an optical imaging payload are being developed and deployed demonstrate main elements concept. this paper, we give overview program....
The Large Synoptic Survey Telescope (LSST) uses a novel, three-mirror, telescope design feeding camera system that includes set of broad-band filters and three refractive corrector lenses to produce flat field at the focal plane with wide view. Optical is integrated in optical mirrors optimize performance. We discuss rationale for LSST optics design, describe methodology fabricating, coating, mounting testing filters, present results detailed analyses demonstrating will meet their performance goals.
A germanium based gamma ray imager with 3D position sensitivity is being developed. The will detect rays in the range of /spl sim/10 keV to 1.5 MeV and locate their interactions within 2 mm X, Y Z. instrument segmented into 39 orthogonal strips both X directions a pitch. Each channel separately instrumented miniature low-noise charge-sensitive preamplifier followed by shaping timing electronics. Germanium imagers 2-D have recently been developed fully our group. current adds capability for...
The Bio-Aerosol Mass Spectrometry (BAMS) system is an instrument used for the real time detection and identification of biological aerosols. Particles are drawn from atmosphere directly into vacuum tracked as they scatter light several continuous wave lasers. After tracking, fluorescence individual particles excited by a pulsed 266nm or 355nm laser. Molecules those with appropriate properties subsequently desorbed ionized using Resulting ions analyzed in dual polarity mass spectrometer....
The Large Synoptic Survey Telescope instrument include four guiding and wavefront sensing subsystems called corner raft subsystems, in addition to the main science array of 189 4K x CCDs. These are placed at corners instrumented field view. Each wavefront/guiding subsystem comprises a pair guide sensors, capable producing 9 frames/second, offset 2K curvature sensors from which images read out cadence camera system, providing 15 sec integrations. guider/wavefront rafts mechanically...
The BioAerosol Mass Spectrometry (BAMS) system is a rapidly fieldable, fully autonomous instrument that can perform correlated measurements of multiple orthogonal properties individual aerosol particles. BAMS front end uses optical techniques to nondestructively measure particle's aerodynamic diameter and fluorescence properties. Fluorescence be excited at 266nm or 355nm detected in two broad wavelength bands. Individual particles with appropriate size then analyzed more thoroughly...
The Large Synoptic Survey Telescope (LSST) is a proposed ground based telescope that will perform comprehensive astronomical survey by imaging the entire visible sky in continuous series of short exposures. Four special purpose rafts, mounted at corners LSST science camera, contain wavefront sensors and guide sensors. Wavefront measurements are accomplished using curvature sensing, which spatial intensity distribution stars measured equal distances on either side focus CCD detectors. four...
The front IR quadrupole absorbers (TAS) and the neutral particle (TAN) in high-luminosity insertions of Large Hadron Collider (LHC) each absorb approximately 1.8 TeV forward collision products on average per pp interaction (/spl sim/235 W at design luminosity 10/sup 34/ cm/sup -2/ s/sup -1/). This secondary flux can be exploited to provide a useful storage ring operations tool for optimization luminosity. A novel segmented, multigap, pressurized gas ionization chamber is being developed...