A zero dead-time, multihit, time and position sensitive detector based on micro-channel plates

Ismail, Iyas; Barat, M.; Brenot, J. C.; Fayeton, J. A.; Lepère, V.; Picard, Y. J.

doi:10.1063/1.1889326

Cited by 15 publications

(8 citation statements)

References 28 publications

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“…For experiments where the possibility of breaking the vacuum is not a dramatic issue or where the space is limited, a more compact home-made version using standard MCP and phosphor screen is described allowing easy maintenance or replacement of MCP and phosphor screen and no specific HV connectors. It is based on our experience with imaging MCP detectors, with capacitive division [12,13], resistive division [14,15], geometric division [6], delay-line [16,17], muti-detector array [18,19] and fast phosphor [20]. This detector has been machined in our workshop and has been used for GIFAD experiments [2,21,22].…”

Section: Diffracted Beams Laue Circlementioning

confidence: 99%

A large area high resolution imaging detector for fast atom diffraction

Lupone

Soulisse

Roncin

2018

Nuclear Instruments and Methods in Physics Research Section B:

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We describe a high resolution imaging detector based on a single 80 mm micro-channel-plate (MCP) and a phosphor screen mounted on a UHV flange of only 100 mm inner diameter. It relies on standard components and we describe its performance with one or two MCPs. A resolution of 80 µm rms is observed on the beam profile. At low count rate, individual impact can be pinpointed with few µm accuracy but the resolution is probably limited by the MCP channel diameter. The detector has been used to record the diffraction of fast atoms at grazing incidence on crystal surfaces (GIFAD), a technique probing the electronic density of the topmost layer only. The detector was also used to record the scattering profile during azimuthal scan of the crystal to produce triangulation curves revealing the surface crystallographic directions of molecular layers. It should also be compatible with reflection high energy electron (RHEED) experiment when fragile surfaces require a low exposure to the electron beam. The discussions on the mode of operation specific to diffraction experiments apply also to commercial detectors.

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Section: Diffracted Beams Laue Circlementioning

confidence: 99%

A large area high resolution imaging detector for fast atom diffraction

Lupone

Soulisse

Roncin

2018

Nuclear Instruments and Methods in Physics Research Section B:

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“…With J. Fayeton at LCAM, Michel started a new career in the emerging field of clusters by investigating atomic collisions with sodium clusters. Together with Y. Picard from LCAM and I. Ismail (PHD), they constructed a "zero dead time" position sensitive detector [67]. Ten years after Michel Barat started a last career on collision induced and laser induced dissociation of bio molecules.…”

Section: Are the Electrons Captured Simultaneously Or One After The O...mentioning

confidence: 99%

Revisiting Atomic Collisions Physics with highly charged ions, A tribute to Michel Barat

Roncin

2020

Preprint

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Michel Barat passed away in November 2018 at the age of 80 after a rich career in atomic and molecular collisions. He had participated actively in formalizing to the electron promotion model, contributed to low energy reactive collisions at the frontier of chemistry. He investigated electron capture mechanisms by highly charged ions, switched to collision induced cluster dissociation and finally to UV laser excitation induced fragmentation mechanisms of biological molecules. During this highly active time he created a lab, organized ICPEAC and participated actively in the administration of research. This paper covers the ten years where he mentored my scientific activity in the blossoming field of electron capture by highly charge ions (HCI). In spite of an impressive number of open channels, Michel found a way to capture the important parameters and to simplify the description of several electron capture processes; orientation propensity, electron promotion, true double electron capture, Transfer ionisation, Transfer excitation, formation of Rydberg states, and electron capture by metastable states. Each time Michel established fruitful collaborations with other groups.

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“…However, synchronization of timing and spatial data channels becomes difficult when events pile up and may become a challenging problem for the applications with very high counting rates. Some of the possible solutions to the event pile up problem are the techniques suggested in references [10],[11] and successfully used in a number of multiparticle detection experiments [12],[13]. Distinguishing which XY position belongs to which time can be done by post-experiment sorting the data.…”

Section: Introductionmentioning

confidence: 99%

“…Distinguishing which XY position belongs to which time can be done by post-experiment sorting the data. In the case of delay line readout the fact that the delay of X and Y lines is a constant allows accurate selection of XY pairs and their time of arrival on the anode [10], or a simultaneous event detection with a CCD camera may allow separation of the events [11]. However, these techniques have not yet achieved the spatial resolution below 10 μm enabling event counting detectors with up to 10000×10000 virtual pixels, as it was shown with novel XS readouts combined with microchannel plates [4],[5].…”

Section: Introductionmentioning

confidence: 99%

High Speed Multichannel Charge Sensitive Data Acquisition System With Self-Triggered Event Timing

Tremsin

Siegmund

Vallerga

et al. 2009

IEEE Trans. Nucl. Sci.

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A number of modern experiments require simultaneous measurement of charges on multiple channels at > MHz event rates with an accuracy of 100-1000 e − rms. One widely used data processing scheme relies on application of specific integrated circuits enabling multichannel analog peak detection asserted by an external trigger followed by a serial/sparsified readout. Although this configuration minimizes the back end electronics, its counting rate capability is limited by the speed of the serial readout. Recent advances in analog to digital converters and FPGA devices enable fully parallel high speed multichannel data processing with digital peak detection enhanced by finite impulse response filtering. Not only can accurate charge values be obtained at high event rates, but the timing of the event on each channel can also be determined with high accuracy.We present the concept and first experimental tests of fully parallel 128-channel charge sensitive data processing electronics capable of measuring charges with accuracy of ~1000 e-rms. Our system does not require an external trigger and, in addition to charge values, it provides the event timing with an accuracy of ~1 ns FWHM. One of the possible applications of this system is high resolution position sensitive event counting detectors with microchannel plates combined with cross strip readout. Implementation of fast data acquisition electronics increases the counting rates of those detectors to multi-MHz level, preserving their unique capability of virtually noiseless detection of both position (with accuracy of ~10 μm FWHM) and timing (~1 ns FWHM) of individual particles, including photons, electrons, ions, neutrals, and neutrons.

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A zero dead-time, multihit, time and position sensitive detector based on micro-channel plates

Cited by 15 publications

References 28 publications

A large area high resolution imaging detector for fast atom diffraction

A large area high resolution imaging detector for fast atom diffraction

Revisiting Atomic Collisions Physics with highly charged ions, A tribute to Michel Barat

High Speed Multichannel Charge Sensitive Data Acquisition System With Self-Triggered Event Timing

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