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Pramana

, Volume 57, Issue 1, pp 115–124 | Cite as

The leak microstructure

  • M Lombardi
  • C Baiocchi
  • A Battistella
  • G Balbinot
  • H Huo-Ja Guoxiang
  • F S Lombardi
Invited Papers Others

Abstract

The capabilities of a new microstructure, anode point based, for the detection of gas ionizing radiations are presented. For every single detected ionizing radiation it gives a pair of ‘induced’ charges (anodic and cathodic) of the same amount (pulses of the same amplitudes), of opposite sign, with the same collection time and essentially in time coincidence, that are proportional to the primary ionization collected. Each pulse of a pair gives the same energy and timing information, thus one can be used for these information and the other for the position. The complete lack of insulating materials in the active volume of this microstructure avoids problems of charging-up and makes stable and repeatable its behavior. It is possible to observe primary avalanches with a size of more than 2.5 × 107 electrons (4 pC), which give current pulses with a peak of more than 0.26 mA on 100 Ohm and about 30 ns duration, with 5.9 KeV X-rays of 55Fe working in proportional region in 760 Torr of isobutane gas. Single electrons emitted by a heated filament (Ec<1 eV) can also be detected in 760 Torr of isobutane; with an estimated gas gain of 1.2 × 106 and a counting rate up to 800 Kpulses/sec per single microstructure. Some new features and three different types of sensitive-position two-dimensional read-out detectors based on these microstructures, which are in developmental stage, are presented.

Keywords

Imaging gaseous detector 

PACS No

85.60.Gz 

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References

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    M Lombardi and F S Lombardi, Nucl. Instrum. Methods A392, 23–27 (1997)ADSGoogle Scholar
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    M Lombardi and F S Lombardi, Nucl. Instrum. Methods A388, 186–192 (1997)ADSGoogle Scholar
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    M Lombardi, G Prete and F S Lombardi, Nucl. Instrum. Methods A409, 65–69 (1998)Google Scholar
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    M Lombardi, H Huo and F S Lombardi, talks given at ‘5th International Conference on Position-Sensitive Detectors’, University College, London, 13–17 September 1999 (http://www.hep.ucl.ac.uk/psd5/talks.htm) (talk No. 118) and at ‘1st workshop on nuclear electronic and instrumentation’ (Havana, 26–29, October, 1999) submitted to Nucl. Instrum. Methods Google Scholar
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Copyright information

© Indian Academy of Sciences 2001

Authors and Affiliations

  • M Lombardi
    • 1
  • C Baiocchi
    • 1
  • A Battistella
    • 1
  • G Balbinot
    • 1
  • H Huo-Ja Guoxiang
    • 1
    • 2
  • F S Lombardi
    • 1
    • 3
  1. 1.INFN Laboratori Nazionali di LegnaroPadovaItaly
  2. 2.China Institute of Atomic EnergyNuclear Physics DivisionBeijingPeople’s Republic of China
  3. 3.Osservatorio Astronomico S. Lucia-05039-StronconeTerniItaly

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