Preliminary demonstration of an IonCCD as an alternative pixelated anode for direct MCP readout in a compact MS-based detector |
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Authors: | Hadjar Omar Fowler William K Kibelka Gottfried Schnute William C |
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Institution: | (1) OI Analytical/CMS Field Products, Pelham, AL 35124, USA;(2) Dionex Corporation, Sunnyvale, CA, USA |
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Abstract: | 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. J Am Soc Mass Spectrom 22(4):612–623, 2011; Johnson et al. J Am Soc Mass Spectrom 22(8):1388–1394, 2011; Hadjar et al. J Am Soc Mass Spectrom 22(10):1872–1884, 2011). This work exploits the recently discovered electron detection capability of the IonCCD (Hadjar et al. J Am Soc Mass Spectrom 22(4):612–623, 2011), 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-to-four-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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