J. A. Jeon

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This paper describes MEMS micromirror characterization in space environments associated with our space applications in earth observation from the International Space Station and earth's orbit satellite. The performance of the micromirror was tested for shock and vibration, stiction, outgassing from depressurization and heating, and electrostatic charging(More)
The Cosmic Ray Energetics And Mass (CREAM) experiment is designed to investigate high energy (10 ~ 10 eV) cosmic rays over the elemental range from hydrogen to iron (1 ≤ Z ≤ 26), through a series of long balloon flights. Originally planned to be flown on the first of the new Ultra Long Duration Balloon (ULDB) being developed by NASA, the CREAM instrument(More)
We introduce a novel telescope consisting of a pinhole-like camera with rotatable MEMS micromirrors substituting for pinholes. The design is ideal for observations of transient luminous phenomena or fast-moving objects, such as upper atmospheric lightning and bright gamma ray bursts. The advantage of the MEMS "obscura telescope" over conventional cameras is(More)
We report a new and improved photon counting method for the precision PDE measurement of SiPM detectors, utilizing two integrating spheres connected serially and calibrated reference detectors. First, using a ray tracing simulation and irradiance measurement results with a reference photodiode, we investigated irradiance characteristics of the measurement(More)
LIDAR (LIght Detection And Ranging) is an important method in measuring atmospheric transparency that is used to correct fluorescence light yield from extensive air showers. For the JEM-EUSO (Extreme Universe Space Observatory on Japanese Experimental Module) mission to observe ultra-high cosmic rays at the ISS (International Space Station) orbiting at 400(More)
After successful recovery of the first CREAM (Cosmic Ray Energetics And Mass) instrument during the 2004/5 Antarctic campaign, the calorimeter was refurbished for a third flight, planned for December 2007. In this CREAM-III calorimeter, the optics were replaced with multi-clad fiber ribbons to enhance the light signal, and new readout electronics boards(More)
The balloon-borne cosmic-ray experiment CREAM-I (Cosmic-Ray Energetics And Mass) recently completed a successful 42-day flight during the 2004-2005 NASA/NSF/NSBF Antarctic expedition. CREAM-I combines an imaging calorimeter with charge detectors and a precision transition radiation detector (TRD). The TRD component of CREAM-I is targeted at measuring the(More)
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