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      Fun Atomic Physics on QuizRevolution

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      Fun Atomic Physics
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      Round
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      Fun Atomic Physics
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      Question by
      Anonymous
      What is the typical Open Area/ Dead Area ratio of an MCP?
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      • 45%

      • 70%

      • 30%

      • 60%

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      Comments:
      1. What is the typical Open Area/ Dead Area ratio of an MCP?
        1. 45%
        2. 70%
        3. 30%
        4. 60%
        1. Micro Channel Plates (MCP) are delicate arrays of millions of very small diameter (~10um) capillaries coated on the inside surface by a metal oxide which produces secondary electrons to an input particle. To maintain mechanical integrity, the open area of active channels to dead area (inter channel area) needs to be ~ 60% max. Content provided by www.tectra.de/MCP.htm
      2. What is the detection efficiency of MCPs to electrons at 200eV?
        1. 20%
        2. 40%
        3. 85%
        4. 60%
        1. The detection efficiency of Microchannel Plates to electrons of 0.2-2KeV is 50-85%. Content provided by www.tectra.de/MCP.htm
      3. What is the maximum input signal count rate for a double (chevron) extended dynamic range MCP?
        1. 1e8 per cm2
        2. 1e8 per mm2
        3. 1e10 per cm2
        4. 1e5 per cm2
        1. The maximum output current of an MCP is ~ 10% of the strip current. Therefore the MCP is available with standard conductivity or as Extended dynamic range MCP. Extended Dynamic Range MCP are specially processed to allow higher conductivity. This higher conductivity allows for increased output currents at the same Gain. Content provided by www.tectra.de/MCP.htm
      4. Which scintillator produces more photons to incoming electrons at 10keV?
        1. P43
        2. PB1
        3. P47
        4. PG2
        1. The general rule of thumb is that the slower the phosphor the more efficient the phosphor. P43 has a time response of 2ms to 10% of peak emission. Where as P47 has a time response of ~ 95ns to 10% of peak emission and PG2 has a time response of ~65ns to 10% of peak emission. PB1 has a time response of ~ 4ns to 10% peak emission. Content provided by www.tectra.de/MCP.htm
      5. The maximum bias voltage over a single MCP is:
        1. 800V
        2. 1200V
        3. 400V
        4. 1000V
        5. 1400V
        1. Standard MCPs are also known as 40:1 MCPs. The maximum voltage over a single standard MCP is 1000V however 700-800V is recommended. An Extended Dynamic Range MCP is also known as a 60:1 MCP. Here the bias voltage over a single MCP can be increased to 1200V although 1000V is recommended. Content provided by www.tectra.de/MCP.htm
      6. A Microchannel plate with a standard Anode has
        1. A 50 Ohm impedance matched Anode
        2. FWHM of time response of <1ns (ringing or reflections < 10% of peak time response pulse)
        3. Time response <40ns with Rise time <300ps
        4. Suitable for fast time-of-flight applications
        1. Only the Fast Anode Microchannel Plate configuration has an impedance matched 50 Ohm Anode. This ensures that there are no reflections in the time response signal. This means that the Fast Anode detector is suitable for time resolution measurements of &lt; 1ns. Content provided by www.tectra.de/MCP.htm
      7. Which Fast Anode is designed for electron time-of-flight allowing the MCPinput to be negatively biased
        1. MCP33DLAF
        2. MCP33DRTGF
        3. MCP33DETF
        4. MCP33DLPFV
        1. MCP33DLAF is a standard anode configuration with time response ~40ns. MCP33DRTGF is a fast anode configuration with signal acquired at ground. MCP33DETF is a fast anode configuration that allows for signal to be acquired at up to 3000V. MCP33DLPF is a MCP with a phosphor screen detector mounted on a viewport. Content provided by www.tectra.de/MCP.htm
      8. The standard electrode material of a microchannel plate is:
        1. Silver
        2. Nickel Chromium
        3. Gold
        4. Silver Chromium
      9. A soft border on a Microchannel plate means that:
        1. There is a solid 1-2mm glass border around the Microchannel plate.
        2. The Microchannel plate has been cut to size.
        3. There is no large solid glass border.
        4. A special boule was developed for this type of Microchannel plate.
        1. A solid glass border around the edge of the MCP can only be manufactured if a special Boule has been prepared to manufacture this diameter of MCP. If an MCP is cut to size then it will have a soft border.

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