Electron optics in hybrid photodetectors in magnetic fields

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The CMS detector design has the hadronic calorimeter immersed in a 4 T magnetic field. The scintillator photon transducer must work reliably in this environment. The baseline phototransducer is the ``hybrid photomultiplier``, which consists of a standard photocathode (S20) followed by a high field acceleration onto the surface of a Si diode. Such a device has a linear response, 1 e out for every 3.6 eV of potential drop in excess of the threshold needed to penetrate the passivation layer of the diode. A threshold voltage of {approximately}2 kV is typical of these devices, leading to a gain of {approximately}2000 ... continued below

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12 p.

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Green, D. December 1, 1996.

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Description

The CMS detector design has the hadronic calorimeter immersed in a 4 T magnetic field. The scintillator photon transducer must work reliably in this environment. The baseline phototransducer is the ``hybrid photomultiplier``, which consists of a standard photocathode (S20) followed by a high field acceleration onto the surface of a Si diode. Such a device has a linear response, 1 e out for every 3.6 eV of potential drop in excess of the threshold needed to penetrate the passivation layer of the diode. A threshold voltage of {approximately}2 kV is typical of these devices, leading to a gain of {approximately}2000 at 10 kV applied voltage. In the interest of reducing costs, the Si surface can be cut into pixels. However, the optics of the electron trajectories must be well understood so as to avoid crosstalk between pixels caused by misalignment of the accelerating electric field and the axis of the CMS magnetic field. The depletion depth of the Si is quite standard, {approximately}300 {mu}m. The source capacity is {approximately}20 pF. The output pulse has a {approximately}6 nsec risetime for > 60 V diode biasing. The device is expected to be highly immune to magnetic field effects due to the short spacing, {approximately}3 mm, between photocathode and Si.

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12 p.

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INIS; OSTI as DE97051079

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  • Other Information: PBD: Dec 1996

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  • Other: DE97051079
  • Report No.: FNAL-TM--1992
  • Grant Number: AC02-76CH03000
  • DOI: 10.2172/434315 | External Link
  • Office of Scientific & Technical Information Report Number: 434315
  • Archival Resource Key: ark:/67531/metadc680137

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • December 1, 1996

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • April 1, 2016, 4 p.m.

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Green, D. Electron optics in hybrid photodetectors in magnetic fields, report, December 1, 1996; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc680137/: accessed April 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.