Spatial distribution of electron cloud footprints from microchannel plates: Measurements and modeling

Tremsin, Anton S.; Siegmund, O.

doi:10.1063/1.1149905

Cited by 56 publications

(37 citation statements)

References 16 publications

(12 reference statements)

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“…The versatility of the MCP makes it a gain-producing element of choice for energetic particles (ionic and neutral species), electrons, X-rays, and from UV to IR when used with appropriate photocathodes. The broad descriptive work of MCPs can be found in early work [5][6][7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Preliminary Demonstration of an IonCCD as an Alternative Pixelated Anode for Direct MCP Readout in a Compact MS-Based Detector

Hadjar

Fowler

Kibelka

et al. 2011

J. Am. Soc. Mass Spectrom.

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We report on the preliminary testing of a new position-sensitive detector (PSD) by combining a microchannel plate (MCP) and a charge-sensitive pixilated anode with a direct readout based on charge-coupled detector (CCD) technology, which will be referred to as IonCCD (Hadjar et al. , allowing it to be used directly behind an MC. This MCP-IonCCD configuration potentially obviates the need for electro-optical ion detector systems (EOIDs), which typically feature a relatively difficult-to-implement 5-kV power source as well as a phosphorus screen behind the MCP for conversion of electrons to photons prior to signal generation in a photosensitive CCD. Thus, the new system (MCP-IonCCD) has the potential to be smaller, simpler, more robust, and more cost efficient than EOID-based technologies in many applications. The use of the IonCCD as direct MCP readout anode, as opposed to its direct use as an ion detector, will benefit from the instant three-tofour-order-of-magnitude gain of the MCP with virtually no additional noise. The signal/noise gain can be used for either sensitivity or speed enhancement of the detector. The speed enhancement may motivate the development of faster IonCCD readout speeds (currently at 2.7 ms) to achieve the 2 kHz frame rate for which the IonCCD chip was designed, a must for transient signal applications. The presented detector exhibits clear potential not only as a trace analysis detector in scan-free mass spectrometry and electron spectroscopy but also as a compact detector for photon and particle imaging applications.

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Section: Introductionmentioning

confidence: 99%

Preliminary Demonstration of an IonCCD as an Alternative Pixelated Anode for Direct MCP Readout in a Compact MS-Based Detector

Hadjar

Fowler

Kibelka

et al. 2011

J. Am. Soc. Mass Spectrom.

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“…20,21 The smallest images of ions produced by ten laser shots of minimal dye laser intensity has a spread of 130 m FWHM which corresponds to a velocity spread (⌬v detector ) of 3.1 m/s under the present experimental conditions. Therefore, it is estimated that 130 m is the minimum image size.…”

Section: A Deflection Of Moleculesmentioning

confidence: 99%

Molecular lens applied to benzene and carbon disulfide molecular beams

Chung

Zhao

Lee

et al. 2001

The Journal of Chemical Physics

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A molecular lens of the nonresonant dipole force formed by focusing a nanosecond IR laser pulse has been applied to benzene and CS 2 molecular beams. Using the velocity map imaging technique for molecular ray tracing, characteristic molecular lens parameters including the focal length ͑f ͒, minimum beam width ͑W͒, and distance to the minimum beam width position ͑D͒ were determined. The laser intensity dependence of the observed lens parameters was in good agreement with theoretical predictions. W was independent of the laser peak intensity (I 0 ), whereas f and D varied linearly with 1/I 0 . The differences in lens parameters between the molecular species were well correlated with the polarizability per mass values of the molecules. A high chromatographic resolution of Rsϭ0.84 was achieved between the images of benzene molecular beams undeflected and deflected by the lens. The possibilities for a new type of chromatography are discussed.

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“…Computer simulation gives us useful information on the distribution of the electron cloud from the MCP output 11,12) . Zanodvorov et al 13) presented a "ballistic" model of the charge cloud propagation based on the differential electron distributions at the MCP output, which had been measured in the experiments of Bronshteyn et al 14) .…”

Section: Lampton and Carlsonmentioning

confidence: 99%

Development of the High-resolution FUV Detector for the BepiColombo Mission

Murakami

Yoshioka

Yoshikawa

2009

Trans. JSASS Space Tech. Japan

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The PHEBUS (Probing of Hermean Exosphere By Ultraviolet Spectroscopy) instrument on Mercury Planetary Orbiter in the BepiColombo mission is a dual FUV-EUV spectrometer (EUV: 55-155 nm, FUV: 145-315 nm). We are now developing the compact detector system sensitive to FUV airglow emissions of the Mercury. The FUV detector is required to have high spatial resolution (512×512 pixels) so that the wavelength resolution of the PHEBUS instrument should be 2 nm at the FUV range. The FUV detector consists of a Cs2Te photocathode, microchannel plates (MCPs), and a resistive anode encoder. In a position-sensitive system with a resistive anode encoder, the spatial resolution is determined by the signal-to-noise ratios at the anode terminals. Therefore, a high and stable electron gain of MCPs allows the position determination of each photoelectron event with high spatial resolution. We studied a method for achieving a high and stable electron gain. We fabricated a test model of the FUV detector incorporating a clamped pair of MCPs (V-stack) followed by a gap and a clamped triplet of MCPs (Z-stack) in cascade. We investigated the effect of the negative inter-stack potential on the PHD and the spatial resolution by means of calculation and experiments. As a result, the negative inter-stack potential made the electron gain more stable and the spatial resolution higher by ~14%. In this paper we report the specific performance of the test model of the FUV detector.

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Spatial distribution of electron cloud footprints from microchannel plates: Measurements and modeling

Cited by 56 publications

References 16 publications

Preliminary Demonstration of an IonCCD as an Alternative Pixelated Anode for Direct MCP Readout in a Compact MS-Based Detector

Preliminary Demonstration of an IonCCD as an Alternative Pixelated Anode for Direct MCP Readout in a Compact MS-Based Detector

Molecular lens applied to benzene and carbon disulfide molecular beams

Development of the High-resolution FUV Detector for the BepiColombo Mission

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