J. Haupt

J. Haupt
Brookhaven National Laboratory · Instrumentation Division

About

20
Publications
2,750
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1,612
Citations

Publications

Publications (20)
Article
CdZnTe (CZT) detectors have been used in the past and are being actively considered for future gamma-ray space telescopes. One of the challenges of operating CZT detectors in low Earth orbit is radiation damage caused by energetic protons. Previous studies concluded that fluences of 10⁸ -10⁹ p/cm ² are sufficient to cause shifting of peak positions...
Preprint
Full-text available
Improved determination of photon wave-functions could provide high-resolution observations in the optical, benefiting numerous topics in astrophysics and cosmology. It has been recently suggested that optical interferometers would not require a phase-stable optical link between the stations if instead sources of quantum-mechanically entangled pairs...
Preprint
Full-text available
The Baryon Mapping eXperiment (BMX) is an interferometric array designed as a pathfinder for a future post-reionization 21 cm intensity mapping survey. It consists of four 4-meter parabolic reflectors each having offset pyramidal horn feed, quad-ridge orthomode transducer, temperature-stabilized RF amplification and filtering, and pulsed noise inje...
Article
Full-text available
We describe here the most ambitious survey currently planned in the optical, the Large Synoptic Survey Telescope (LSST). The LSST design is driven by four main science themes: probing dark energy and dark matter, taking an inventory of the solar system, exploring the transient optical sky, and mapping the Milky Way. LSST will be a large, wide-field...
Conference Paper
Full-text available
An integrating sphere is often used to approximate a flat illumination field at some distant surface, but in the design of a tunnel which bridges the integrating sphere and the surface it illuminates, many opportunities exist to contaminate the geometric purity that would exist in the tunnel’s absence. It is shown that when constraining the tunnel/...
Article
We describe a system to measure the Quantum Efficiency in the wavelength range of 300 nm to 1100 nm of 40x40 mm n-channel CCD sensors for the construction of the 3.2 gigapixel LSST focal plane. The technique uses a series of instrument to create a very uniform flux of photons of controllable intensity in the wavelength range of interest across the...
Conference Paper
The science focal plane of the LSST camera is made up of 21 fully autonomous 144 Mpixel imager units designated raft tower modules (RTM). These imagers incorporate nine 4K x 4K fully-depleted CCDs and 144 channels of readout electronics, including a dedicated CMOS video processing ASIC and components that provide CCD biasing and clocking, video dig...
Conference Paper
Full-text available
The Large Synoptic Survey Telescope (LSST) camera will be made as a mosaic assembled of 189 large format Charge Coupled Devices (CCD). They are n-channel, 100 micron thick devices operated in the over depleted regime. There are 16 segments, 1 million pixels each, that are read out through separate amplifiers. The image quality and readout speed exp...
Article
The design of a simple lens system is described capable of projecting a diffraction limited f1/.2 point of light through a variety of plane parallel vacuum windows. The system was built for the purpose of testing prototype CCDs for the Large Synpotic Survey Telescope in which lab testing drove the desire to create a beam that matches the telescope'...
Article
X-ray frames offer a lot of information about CCD. 55 Fe 55 Fe sources are traditionally being used for CCD gain and charge transfer efficiency (CTE) measurements. In addition X-rays can be used for the system linearity test. We demonstrate how spectral lines of 55 Fe and 241 Am rad. sources are used for system linearity measurements. The pixel siz...
Conference Paper
Full-text available
X-rays frames offer a lot of information about CCD. 55Fe sources are traditionally being used for CCD gain and charge transfer efficiency (CTE) measurements. The pixel size of modern scientific CCDs is getting smaller. The charge diffusion causes the charge spread among neighboring pixels especially in thick fully depleted sensors. This enables mea...
Article
The Large Synoptic Survey Telescope (LSST) Project is a public-private partnership for a large-aperture, wide-field, ground-based telescope that will survey half the sky every few nights in six optical bands. The 8.4-meter telescope will be located on the El Pen peak of Cerro Pachn, a 2682 metre high mountain in Coquimbo Region, in northern Chile....

Projects

Projects (2)
Project
Survey telescope for cosmology.