&lt;title&gt;In-flight performance and calibration of the Chandra high-resolution camera imager (HRC-I)&lt;/title&gt;

Kenter, A.; Chappell, John H.; Kraft, Ralph; Meehan, G. R.; Murray, Stephen S.; Zombeck, Martin V.; Hole, K. T.; Juda, M.; Donnelly, Rich; Patnaude, Daniel; Pease, Deron O.; Wilton, C. R. A.; Zhao, Ping; Austin, G.; Fraser, George W.; Pearson, James F.; Lees, J.E.; Brunton, Adam N.; Barbera, Marco; Collura, A.; Serio, S.

doi:10.1117/12.391585

Cited by 15 publications

(1 citation statement)

References 18 publications

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“…12 The remaining events preserve the angular distribution of the mirror response, but the filter removes a large percentage of the original events (up to 50%).…”

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confidence: 99%

<title>Orbital measurement and verification of the Chandra X-ray Observatory's PSF</title>

et al. 2000

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The recently launched Chandra X-Ray Observatory (CXO) was designed to have the sharpest angular resolution yet of any X-ray telescope. Detailed modeling and metrology of the optics followed by extensive testing at the X-Ray Calibration Facility at the Marshall Space Flight Center in Huntsville, Alabama indicated that the optics were performing exceedingly well. While our analysis accounted for distortion of the mirrors due to gravity and the effects of finite distance and size of the X-ray generator, it was only on-orbit that we expected to directly observe the specified half arc-second performance.We present here results of the on-orbit calibration of the point spread function (PSF), comparing it with our predictions. We discuss how the PSF varies with source location in the telescope field of view, as well as with the spectral energy distribution of the source.

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“…12 The remaining events preserve the angular distribution of the mirror response, but the filter removes a large percentage of the original events (up to 50%).…”

mentioning

confidence: 99%

<title>Orbital measurement and verification of the Chandra X-ray Observatory's PSF</title>

et al. 2000

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An Overview of the Performance of the Chandra X-ray Observatory

Weisskopf

Aldcroft²,

Bautz

et al. 2003

Experimental Astronomy

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The Chandra X-ray Observatory is the X-ray component of NASA's Great Observatory Program which includes the recently launched Spitzer Infrared Telescope, the Hubble Space Telescope (HST) for observations in the visible, and the Compton Gamma-Ray Observatory (CGRO) which, after providing years of useful data has reentered the atmosphere. All these facilities provide, or provided, scientific data to the international astronomical community in response to peer-reviewed proposals for their use. The Chandra X-ray Observatory was the result of the efforts of many academic, commercial, and government organizations primarily in the United States but also in Europe. NASA's Marshall Fiducial transfer system (FTS) -directs light from the fiducial lights to the ACA, via a retroreflector collimator (RRC) mounted at the X-ray telescope center, and a periscope.Coarse sun sensor (CSS) -Provides all-sky coverage of the sun. Fine sun sensor (FSS) -Has a 50 o FOV and 0.02 o accuracy. Earth sensor assembly (ESA) -Conical scanning sensor, used during the orbital insertion phase of the mission. Reaction wheel assembly (RWA) -6 momentum wheels which change spacecraft attitude. Momentum unloading propulsion system (MUPS) -Liquid fuel thrusters which allow RWA momentum unloading. Reaction control system (RCS) -Thrusters which change spacecraft attitude. APS Conf. Ser. Style 7ACA The aspect camera assembly ( Figure 6) includes a sunshade (∼2.5 m long, ∼55 cm in diameter), a 11.2 cm, F/9 Ritchey-Chretien optical telescope, and CCD detector(s). This assembly and its related components are mounted on the side of the X-ray telescope. The camera's field of view is 1.4 o × 1.4 o and the sunshade is designed to protect the instrument from the light from the Sun, Earth and Moon, with protection angles of 47 o , 20 o and 6 o , respectively. Only light from the sun can damage the system. Having either the Moon or the Earth in the field-of view only saturates the detector output without incurring damage and therefore only limits the aspects camera's utility. The Moon (Figure 7) 1 has been viewed with Chandra, in part to study the background signal, and in part to learn about the Moon's chemical composition.The aspect camera focal plane detector is a 1024 × 1024 Scientific Imaging Technologies CCD, with 24×24 micron (5×5 ′′ ) pixels, covering the spectral band between 4000 and 9000Å. The CCD is deliberately placed out of focus (point source FWHM = 9 arcsec) to spread the star images over several pixels in order to increase the accuracy of the centering algorithm, and to reduce variation in the point response function over the field of view. There is a spare CCD, which can be illuminated by rotating a mirror.The ACA electronics track a small pixel region (either 4 × 4, 6 × 6, or 8 × 8 pixels) around the fiducial light and star images. There are a total of eight regions available for tracking. Typically five guide stars and three fiducial lights are tracked. The average background is subtracted on-board, and image centroids are calculated by a weighted...

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A simple approach for characterizing the spatially varying sensitivity of microchannel plate detectors

Aglagul

Kaufman

Cheng

et al. 2022

Review of Scientific Instruments

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We present a simple approach to characterize the spatial variation of the gain in microchannel plate (MCP) coupled to phosphor detectors using single electron or photon hits. The technique is easy to implement and general enough to be extended to other kinds of detectors. We demonstrate the efficacy of the approach on both laboratory and Monte Carlo generated datasets. Furthermore, we use the approach to measure the variation in gain over time as the MCP is exposed to an increasing number of electrons.

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<title>In-flight performance and calibration of the Chandra high-resolution camera imager (HRC-I)</title>

Cited by 15 publications

References 18 publications

<title>Orbital measurement and verification of the Chandra X-ray Observatory's PSF</title>

<title>Orbital measurement and verification of the Chandra X-ray Observatory's PSF</title>

An Overview of the Performance of the Chandra X-ray Observatory

A simple approach for characterizing the spatially varying sensitivity of microchannel plate detectors

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