Performance of a large scale multilayer ionization detector and its use for measurements of the relativistic rise in the momentum range of 20–110 GeV/c

Lehraus, I.; Matthewson, R.; Tejessy, W.; Aderholz, M.

doi:10.1016/0029-554x(78)90971-0

Cited by 53 publications

(16 citation statements)

References 5 publications

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“…Nevertheless, our present results are not yet as good as the expected performance derived in ref. 1 from the EPI measurements [28] (about 6% fwhm was expected at 5 atm). This holds true for results including drift as well as for measurements from tracks passing directly inside the samples without drift.…”

Section: Discussionmentioning

confidence: 90%

measurements in Ne, Ar, Kr, Xe and pure hydrocarbons

Lehraus¹,

Matthewson²,

Tejessy³

1982

Nuclear Instruments and Methods in Physics Research

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Ionization sampling resolution and relativistic rise at 15 GeV/c were compared at different pressures in neon, argon, krypton, xenon and pure hydrocarbons, using a detector consisting of 64 samples of 4 cm and a drift space of up to 50 cm. Best results were obtained for Ir/p separation in neon (> 6.70) and for e/It separation in xenon (> 4.8o). Pure ethylene and propane were comparable to argon mixtures for ~r/p separation, but the corresponding e/~r separation suffered from a lower relativistic rise. The signal attenuation by electron attachment was more pronounced in heavier hydrocarbons. Drift velocity measurements are presented and E/p limits imposed by requirements of dE/dx resolution are discussed.

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Section: Discussionmentioning

confidence: 90%

measurements in Ne, Ar, Kr, Xe and pure hydrocarbons

Lehraus¹,

Matthewson²,

Tejessy³

1982

Nuclear Instruments and Methods in Physics Research

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“…The resolution, (fwhm) is then 100%. The most probable value can be compared to a Lehraus measurement [2] in a mixture of argon and 5% methane which leads to Nt PP ----48.…”

Section: 2 Deposited Energymentioning

confidence: 99%

“…The rise is referred to the minimum of ionization. In order to be compared to the EPI results [2], the most probable values were calculated as a truncated mean, calculated as the 50% smallest of a sample of 100 cells, The experimental points are indicated on the figure. We must remark that the determination of these most probable values depends on the choice of the truncation, (curves C1 and C2 in fig.…”

Section: Relativistic Risementioning

confidence: 99%

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Simulation of the measurement by primary cluster counting of the energy lost by a relativistic ionizing particle in argon

Lapique

Piuz

1980

Nuclear Instruments and Methods

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Energy loss of charged particles in a gas has been estimated by a computer simulation technique with a view of studying primary cluster counting as a mean of the particle identification. Primary electron yield and secondary multiplication have been estimated through a detailed calculation of the atomic processes. Results are presented for pure argon in terms of cluster size distributions and relativistic rise of the number of clusters: the latter reaches a plateau at a 3' of 200 and of level of 1.32 times minimum ionization. Limitations to detector resolution due to electronic dead time and longitudinal diffusion of the electrons drifting in the gas are presented. Such limitations are introduced in a comparison between the performance in particle separation of detectors based on energy loss, making use of pulse height measurement or cluster counting.

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“…The relativistic rise measurements, using a positive tagged pencil ray beam ($3 upstream of BEBC) of variable momentum passing centrally through slice 2 of the full EPI, have already been reported [5]. Fig.…”

Section: External Particle Identifier Calibration Runmentioning

confidence: 99%