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Charge transport in liquid tetramethylsilane (TMS) at low and high electric fields

Research output: Contribution to journalArticle

Author(s)

M Chaar, D E Watt

School/Research organisations

Abstract

Organo-liquids have never been satisfactory as di-electrics in radiation dosimeters operated as pulse detectors in the ionisation chamber and proportional counter modes. In an attempt to assess the key factors involved. ionisation chambers filled with liquid tetramethylsilane (TMS) have been used to measure the dark and ionisation currents. The results in general are consistent with previous work in revealing the existence of spurious charges, indicating the need for ultra-high purity of the di-electric, the importance of the electrode surface quality and the 'bubble' phenomenon. A method has been devised to enable separation of the spurious and true contributions to the dark and ionisation currents by using electrodes with different gap separations. Electro-hysteresis was observed and attributed to the formation and decay of 'bubbles'. For diagnostic purposes. a method using the W value was devised to discern the presence of spurious charges in the observed net ionisation current. An ionisation plateau., of slope similar to 5% kV/cm, was observed for electric fields in the range 1-25 kV/cm, before the onset of intrinsic charge multiplication extending to 200 kV/cm. (C) 2001 Elsevier Science B.V. All rights reserved.

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Details

Original languageEnglish
Pages (from-to)615-626
Number of pages12
JournalNuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Volume184
Issue number4
DOIs
Publication statusPublished - Dec 2001

    Research areas

  • liquid ionisation chamber, microdosimetry, charge transport, high field conductivity, saturation charge collection, tetramethylsilane, IONIZATION-CHAMBER, DOSIMETRY, RADIATION

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