2K×2K resolution element photon counting MCP sensor with &gt;200 kHz event rate capability

Vallerga, J.; Siegmund, O.

doi:10.1016/s0168-9002(99)01215-2

Cited by 29 publications

(26 citation statements)

References 5 publications

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“…18 The position and time of arrival with respect to the photodissociation laser is recorded for each ion observed in a single data cycle (containing one laser pulse). The raw data that is periodically written to the computer's hard drive during data collection consists of an (x, y, t) triplet describing each detected ion.…”

Section: Ion Detector and Data Acquisition Systemmentioning

confidence: 99%

The multiplexed chemical kinetic photoionization mass spectrometer: A new approach to isomer-resolved chemical kinetics

Osborn

Zou

Johnsen

et al. 2008

Review of Scientific Instruments

197

175

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Electronic mail: dlosbor@sandia.gov (DLO), cataatj@sandia.gov (CAT).We have developed a multiplexed time-and photon-energy-resolved photoionization mass spectrometer for the study of the kinetics and isomeric product branching of gas phase, neutral chemical reactions. The instrument utilizes a side-sampled flow tube reactor, continuously tunable synchrotron radiation for photoionization, a multi-mass double-focusing mass spectrometer with 100% duty cycle, and a time-and positionsensitive detector for single ion counting. This approach enables multiplexed, universal detection of molecules with high sensitivity and selectivity. In addition to measurement of rate coefficients as a function of temperature and pressure, different structural isomers can be distinguished based on their photoionization efficiency curves, providing a more detailed probe of reaction mechanisms. The multiplexed 3-dimensional data structure

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Section: Ion Detector and Data Acquisition Systemmentioning

confidence: 99%

The multiplexed chemical kinetic photoionization mass spectrometer: A new approach to isomer-resolved chemical kinetics

Osborn

Zou

Johnsen

et al. 2008

Review of Scientific Instruments

197

175

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“…Our most commonly used delay line configuration is the cross delay line (XDL). We have achieved resolutions of < 25 μm in tests [6] over 65 mm x 65 mm at counting rates of ~ 100 KHz. Although our delay line readout detectors have Manuscript proven highly effective in missions such as GALEX, they have two fundamental limitations that are associated with the count rate.…”

Section: Introductionmentioning

confidence: 95%

High performance cross-strip detector technologies for space astrophysics

Siegmund

Tremsin

Vallerga

2007

2007 IEEE Nuclear Science Symposium Conference Record

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We describe a novel MCP imaging detector scheme using the Cross Strip (XS) anode. This anode uses charge division, and centroiding, of microchannel plate charge signals detected on two orthogonal layers of sense strips to encode event X-Y position, event time and signal amplitude. We have developed novel XS anode structures that will, in combination with a new generation of small pore MCP's (< 4μm pores), perform at the highest resolution levels (<10μm) with self triggered ~1 ns timing accuracy and encode photons at greater than 1 MHz rates. Our development the XS charge division scheme has been demonstrated with formats up to 32mm 2 . They show excellent resolution (better than 7 μm FWHM, actually imaging the MCP pores) using low MCP gain (5 x 10 5 ). We have investigated XS anode structures that will accommodate a wide variety of forms (circular, square, rectangular). We are using this concept to produce open face and sealed tube detectors for imaging a wide range of photon and particle events.To encode event positions we have designed and built a parallel channel encoding electronics. The front end boards utilize two RD-20, 32 channel preamplifier ASICs. The preamplified signal is post-amplified on the same board in order to match the dynamic range of downstream 60 Msps ADCs that constantly digitize the signal for subsequent digital peak detection. Tests with eight 60 Msps ADC channels and a software Finite Impulse Response algorithm demonstrate <5 μm electronic resolution and <10μm resolution with a 32mm XS anode detector. A full 64 channel 60 Msps ADC circuit has been constructed along with a Xilinx Virtex 5 FPGA event processing board. In combination with firmware based Xilinx centroiding algorithms, encoding the event positions at more than 1 MHz rates over large areas should also be possible. Such detector system may be used for a variety of future missions, in solar, solar system and astronomical applications.

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“…A delay line position encoding electronics ͑Sensor Sciences, Inc., Berkeley, CA͒ has been implemented 36 for initial evaluation of the "edge-on" MCP detector for x-ray imaging. This electronics provides a spatial resolution of 28 m FWHM ͑full width at half maximum͒.…”

Section: A Photon Counting Mcp Detectormentioning

confidence: 99%

“…This electronics provides a spatial resolution of 28 m FWHM ͑full width at half maximum͒. 36 The MCP detector assembly includes a MCP converter, two MCP amplifiers, and a delay line anode. 23 The MCP converter and MCP amplifiers are 1 mm thick, 63ϫ 43 mm in size, 25 m channel diameter, 5 m channel wall thickness, and 38% Pb content in weight.…”

Section: A Photon Counting Mcp Detectormentioning

confidence: 99%

Photon counting computed tomography: Concept and initial results

Shikhaliev

Molloi

2005

Med. Phys.

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A concept of a photon counting cone beam CT is proposed. The system uses a new Multi Slit Multi Slice (MSMS) cone beam acquisition geometry utilizing a linear array photon counting detectors. The MSMS cone beam acquisition is a direct analogy of the scanning multislit acquisition used in projection x-ray imaging. This geometry provides a CT imaging with dose efficient scatter rejection and allows for using available photon counting detectors. The microchannel plate (MCP) detector is proposed as a linear array photon counting detector for MSMS cone beam CT system. Initial testing of the MCP detector for CT application was performed. The field of view of the prototype MCP detector is 60 mm. A delay line position encoding electronics was used. The electronics has a single channel input for evaluation of events from the entire detector field of view. This limits the system count rate at 2 x 10(5) count/s. The spatial resolution of this detector is 80 microm FWHM at 40 kVp and 200 microm FWHM at 90 kVp tube voltages. The detector noise in CT projections is less than 1 count/pixel for the 80 microm pixel size. The CT projections contain quantum-limited and scatter free signal. Images of a contrast phantom and a small animal were acquired at 50 kVp and 80 kVp tube voltages. The CT numbers for different contrast elements were calculated for a given x-ray spectrum and compared with experimental values. The quantum efficiency of the current detector is 56% at 90 kVp, which is suboptimal because of the large channel diameter (25 microm) of these MCPs. The MCPs with smaller channels and higher efficiencies are being tested. The quantum efficiency was measured to be 70% for a new MCP with 5 microm channel diameter. Design parameters of a clinically applicable photon counting MSMS cone beam CT for breast imaging was evaluated. System uses 20 cm field of view MCP detectors based on 5 microm channel MCPs and high count rate ASIC electronics. It was concluded that the MSMS cone beam CT with a photon counting MCP detector is feasible for volume breast imaging.

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2K×2K resolution element photon counting MCP sensor with >200 kHz event rate capability

Cited by 29 publications

References 5 publications

The multiplexed chemical kinetic photoionization mass spectrometer: A new approach to isomer-resolved chemical kinetics

The multiplexed chemical kinetic photoionization mass spectrometer: A new approach to isomer-resolved chemical kinetics

High performance cross-strip detector technologies for space astrophysics

Photon counting computed tomography: Concept and initial results

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