Performance characteristics of atomic layer functionalized microchannel plates

Siegmund, Oswald H. W.; Richner, N.J.; Gunjala, Gautam; McPhate, Jason B.; Tremsin, Anton S.; Frisch, H.; Elam, Jeffrey W.; Mane, Anil U.; Wagner, R. G.; Craven, C. A.; Minot, Michael J.

doi:10.1117/12.2024919

Cited by 27 publications

(18 citation statements)

References 12 publications

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“…They attributed this to a reduction of radioactive alkali metal content by a factor of 3 to 4 from a conventional MCP formulation. Background rates in similar conventional MCPs have been observed as low as 0.25 counts/(s cm 2 ) [ Siegmund et al ., ].…”

Section: Current State Of the Art Conventional And Ald Mcpsmentioning

confidence: 99%

“…As stated above, conventional MCPs exhibit a charge extraction behavior in which the gain rapidly decreases over the first 0.3 C/cm 2 extracted from the plates, after which the gain decreases at a lower rate for the lifetime of the plate [ Siegmund et al ., ]. The gain may be restored temporarily by raising the MCP voltage, until the MCP reaches the end of its useful life.…”

Section: Current State Of the Art Conventional And Ald Mcpsmentioning

confidence: 99%

“…Siegmund et al . [] presented the gain for a pair of MCPs with an ALD MgO secondary emission layer. The gain rose after a bakeout and then stabilized.…”

Section: Current State Of the Art Conventional And Ald Mcpsmentioning

confidence: 99%

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Microchannel plate fabrication using glass capillary arrays with Atomic Layer Deposition films for resistance and gain

et al. 2016

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Microchannel plates (MCPs) have been used for many years in space flight instrumentation as fast, lightweight electron multipliers. A new MCP fabrication method combines a glass substrate composed of hollow glass capillary arrays with thin film coatings to provide the resistive and secondary electron emissive properties. Using this technique, the gain, resistance, and glass properties may be chosen independently. Large‐area MCPs are available at moderate cost. Secondary emission films of Al2O3 and MgO provide sustained high gain as charge is extracted from the MCP. Long lifetimes are possible, and a total extracted charge of 7 C/cm2 has been demonstrated. Background rates are low because the glass substrate has little radioactive potassium 40. Curved MCPs are easily fabricated with this technique to suit instrument symmetries, simplifying secondary electron steering and smoothing azimuthal efficiency.

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Section: Current State Of the Art Conventional And Ald Mcpsmentioning

confidence: 99%

Section: Current State Of the Art Conventional And Ald Mcpsmentioning

confidence: 99%

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Microchannel plate fabrication using glass capillary arrays with Atomic Layer Deposition films for resistance and gain

et al. 2016

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“…The lifetime and preconditioning of ALD MCPs is significantly different than conventional MCPs 25 . The secondary emissive MgO or Al 2 O 3 layer for ALD MCPs is the most important factor for the behavior of the stability of ALD MCPs.…”

Section: Borosilicate Ald Mcp Preconditioning and Lifetime Characterimentioning

confidence: 99%

“…With early (C5) devices we have seen significant increases (×10) in MgO ALD MCP gain when subjected to a 350 °C vacuum bake. Subsequently "burn-in" with a high flux at low overall gain showed no gain change at normal operational settings (2 × 10 6 ) after 7 C cm -2 extracted 25 . Recent MgO ALD C14 MCPs show virtually no gain change during burn-in straight "out of the box" (Fig.…”

Section: Borosilicate Ald Mcp Preconditioning and Lifetime Characterimentioning

confidence: 99%

Microchannel plate detector technology potential for LUVOIR and HabEx

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Siegmund

et al. 2017

UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XX

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Microchannel plate (MCP) detectors have been the detector of choice for ultraviolet (UV) instruments onboard many NASA missions. These detectors have many advantages, including high spatial resolution (<20 µm), photon counting, radiation hardness, large formats (up to 20 cm), and ability for curved focal plane matching. Novel borosilicate glass MCPs with atomic layer deposition combine extremely low backgrounds, high strength, and tunable secondary electron yield. GaN and combinations of bialkali/alkali halide photocathodes show promise for broadband, higher quantum efficiency. Cross-strip anodes combined with compact ASIC readout electronics enable high spatial resolution over large formats with high dynamic range. The technology readiness levels of these technologies are each being advanced through research grants for laboratory testing and rocket flights. Combining these capabilities would be ideal for UV instruments onboard the Large UV/Optical/IR Surveyor (LUVOIR) and the Habitable Exoplanet Imaging Mission (HABEX) concepts currently under study for NASA's Astrophysics Decadal Survey.

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