Experimental investigations on the first Townsend coefficient in pure isobutane

Mangiarotti, A.; Vivaldini, Túlio Cearamicoli; Gonçalves, Josemary A. C.; Botelho, S.; Fonte, P.; Takahashi, J.; Tarelho, Luiz Vicente Gomes; Bueno, Carmen C.

doi:10.1016/j.nima.2011.12.060

Cited by 15 publications

(35 citation statements)

References 28 publications

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“…Details on the experimental setup, mainly concerned with the mechanical construction and electronics, were given elsewhere [1,2]. A similar technique has also been employed by other groups [13,14].…”

Section: Methodsmentioning

confidence: 99%

“…High voltage was applied to the brass plate through a low-pass filter circuit (for details see Ref. [2]). …”

Section: Methodsmentioning

confidence: 99%

“…The drift velocity was measured [1] well into the saturation region up to E=N % 200 Td (1 Td¼10 À21 V m 2 ) for the first time, employing the classical Townsend Time-of-Flight method. The first Townsend coefficient was better measured in our second paper [2], using the current gain in pulsed mode, covering the same electric field range, where no data were available before. To reach even higher values of E=N, some technical limitations remain, as well as the difficulty of employing the correct set of transport parameters, once the continuous (Steady State Townsend) and pulsed (Pulsed Townsend) regimes cannot be regarded as equivalent.…”

Section: Introductionmentioning

confidence: 94%

“…Moreover, they can be used to constrain electron impact cross-sections, relevant in other very different areas of physics, as in the control of plasma assisted processing, where discharges in gases are involved. With this broad-band of application in mind, our group built and commissioned a dedicated setup to experimentally investigate electron transport in gases [1], on which a first round of improvements has recently been completed concerning laser focussing problems and field non uniformities [2].…”

Section: Introductionmentioning

confidence: 99%

“…After having discussed the several improvements made to our setup [2], the present paper is instead dedicated to experimental investigations of the physical processes possibly present in our system. The focus is again on isobutane in view of the interesting results previously obtained.…”

Section: Introductionmentioning

confidence: 99%

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Secondary effects on electron multiplication in pure isobutane

Mangiarotti

Vivaldini

Gonçalves

et al. 2012

Nuclear Instruments and Methods in Physics Research Section A:

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a b s t r a c tThe presence of secondary processes in electron multiplication under high uniform electric fields at atmospheric pressure in pure isobutane was investigated. The experimental setup consists of a Resistive Plate Chamber-like cell with the anode made of a high resistivity glass (2 Â 10 12 O cm) and a metallic cathode, on which photoelectrons are produced by the incidence of a pulsed laser beam. In particular, the dependence of the first Townsend coefficient (a) on the repetition rate and the intensity of the UV laser pulses was studied. The E=N range considered spanned from % 145 to % 200 Td. The a coefficient was determined by measuring both the primary ionization and the avalanche currents with the help of an electrometer, directly connected to the cathode. Of all the investigated secondary effects, only the ohmic drop across the resistive glass has been found to be non-negligible in the present experimental conditions and has been corrected for. The obtained values are compared with Magboltz simulation results and presented in tabular form.

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