Study of the high rate performance of the MicroCAT detector

Sarvestani, A.; Besch, H.J.; Menk, R.H.; Pavel, N.; Sauer, N.; Strietzel, C.; Walenta, A.H.

doi:10.1016/s0920-5632(99)00582-4

Cited by 7 publications

(7 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…High intensity precision, good spatial resolution, high local count-rate capability [as demonstrated by ], very high time resolution [as demonstrated by Sarvestani et al (1999)] and high robustness are met simultaneously. It is expected that, by suppressing the systematic errors affecting the position encoding, an image uniformity without spatial distortions will be obtained.…”

Section: Discussionmentioning

confidence: 99%

Biological X-ray diffraction measurements with a novel two-dimensional gaseous pixel detector

Sarvestani

Amenitsch

Bernstorff

et al. 1999

J Synchrotron Radiat

View full text Add to dashboard Cite

In order to exploit the potential of modern X-ray diffraction studies to its full extent, a new generation of appropriate detectors is required. Here, a small prototype (28 Â 28 mm 2 active area) of a novel two-dimensional pixel detector is presented which satis®es most of the requirements. It is based on a gaseous single-photon counter with asynchronous readout and interpolating position encoding, combining the advantages of a pure pixel readout (high local and global rate capability) with those of a projecting readout (small number of channels). In order to demonstrate the suitability of this detector for X-ray diffraction applications, measurements at a synchrotron radiation source have been performed recording diffraction patterns from different biological samples (rat tail tendon collagen, phospholipid and protein crystal). These measurements have proven the good spatial resolution, the high intensity precision and the high local rate capability. Moreover, the single-photon readout was utilized in order to perform time-resolved measurements in the case of SAXS studies and to apply ®ne angular slicing in the case of protein crystallography. The detector has a high reliability and robustness, particularly when compared with conventional gaseous detectors, and the technology used can be easily extended to large active areas.

show abstract

Section: Discussionmentioning

confidence: 99%

Biological X-ray diffraction measurements with a novel two-dimensional gaseous pixel detector

Sarvestani

Amenitsch

Bernstorff

et al. 1999

J Synchrotron Radiat

View full text Add to dashboard Cite

show abstract

“…Extrapolation of the primary photoemission followed the form, 18 YpOcf^Ex^iEx) (11) where the function f p (Ex) is a slowly varying function of the x-ray energy which approximately follows the energy-dependent range of the most energetic photoelectrons produced by the x rays. The function was empirically fit to the form…”

Section: Photoemission Effectsmentioning

confidence: 99%

Integrated Detector Technology for Corrosion Inspection

Smith¹

2000

View full text Add to dashboard Cite

REPORT DOCUMENTATION PAGEPublic reporting burden for this collection ol information is estimated to average 1 hour per response, including th< and maintaining the data needed, and completing and reviewing the collection of information. ABSTRACT (Maximum 200 words)This project investigated the use of gas micro-strip detectors as a means of improving the throughput of an innovative technique for detecting hidden corrosion in aging aircraft. The evaluations included the development of system, detector and data-readout concepts capable of meeting the resolution and throughput goals for this instrument, and the modeling and computation of x-ray and electron interactions in the detector.The results of this evaluation indicate that these detectors can be adapted to this application and can achieve the spatial resolution and count rates required to support a system throughput up to 25 m/hr for detection of 5% corrosion in lapjoints. This throughput, nearly two orders-of-magnitude faster than the existing demonstration system, is sufficient to support the use of this instrument as a practical adjunct to existing technologies. The next step in development would be the fabrication of this detector and the demonstration that the sensitivity and throughput targets can be achieved in a demonstration system.

show abstract

“…In the case of the l D , position resolution is obtained by collecting the deposited and option- ally amplified charge on a fine structure with gold-plated parallel strips with a pitch of 150 pm and a length of 20 mm (for a detailed description see Menk et al, 1998). For reading out the 128 existing strips two VLSI chips are used.…”

Section: Set-up Of the Detectorsmentioning

confidence: 99%

“…Even higher count rates were observed for the 1D when the Micro-CAT structure was used as a simple shielding grid and subsequently the detector was operated in ionization chamber mode with Frisch-grid (see Menk et al, 1995 ). In this fashion, photon flux densities up to l0l2 photons/mm2.sec could be measured without any saturation effects (see Menk et al, 1998). Due t o the inherent noise of conventional integrating detectors and the associated read-out electronics, these devices clearly contribute t o the noise in a measurement.…”

Section: Technical Reportmentioning

confidence: 99%

“…Utilizing a dynamic adjustment of the gas gain during a detector scan it was possible t o measure almost the entire diffraction pattern of the aforementioned sample from the 8th order peak to a region very close t o the direct beam featuring a dynamic range of lo7 -lo8 ( Figure 6). A priori it was unclear what would be the effect on the spatial resolution of 3 line pair/ mm or 0.15 mm FWHM (see Menk et al, 1998) when a hot spot with some 1012 photons/sec .mm2 impinges on the active area of the detector.…”

Section: Technical Reportmentioning

confidence: 99%

See 1 more Smart Citation