Fundamental Processes in Drift Chambers

Sadoulet, B.

doi:10.1088/0031-8949/23/4a/014

Cited by 12 publications

(6 citation statements)

References 23 publications

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“…The argon may be mixed with gases consisting of heavy organic molecules, such as carbon dioxide or isobutane. These gases, known as quenchers, have many degrees of freedom and can efficiently absorb energy from the gas [7]. As a result, the effective temperature of the electron is reduced, the drift velocity is increased, and the diffusion is decreased.…”

Section: E~wli= (Re~)mentioning

confidence: 99%

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Drift chambers

2023

Introduction to Experimental Particle Physics

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Drift chambersA drift chamber is a particle tracking device that uses the drift time of ionization electrons in a gas to measure the spatial position of an ionizing particle [1-3]. Drift chambers can achieve spatial resolutions an order of magnitude smaller than MWPCs. A typical timing measurement accuracy of 2 ns and a drift velocity of 4 cm/l1,5 corresponds to a theoretical spatial accuracy of 80 11m. Drift chambers have found wide acceptance as charged particle tracking detectors in spectrometer systems. When covering large solid angles, drift chambers provide resolution equal to MWPCs at a much lower cost.A typical drift chamber arrangement is shown in Fig. 10.1. A region of approximately uniform field is set up between the anode and cathode wires. A charged particle traversing the chamber liberates electrons that drift toward the anodes. The passage of the particle also generates a fast pulse in the scintillation counter that can be used to define a reference time to. The electrons drift for a time ~ t, after which they are collected at the anode, thereby providing a signal that a particle has passed. The position where the particle traversed the chamber is then given by i 1o+.11 X = w(t) dt 10 (10.1 ) where w(t) is the drift velocity. 10.1Properties of drift chamber gases The passage of ionizing radiation through the gas in a drift chamber cell leaves behind a trail of electrons and positive ions. In order to use the electron arrival times to accurately locate the position in the chamber that was traversed by the incoming particle, we must have an

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Section: E~wli= (Re~)mentioning

confidence: 99%

“…According to Eqs. 10.11 and 10.13, this reduces Ekand thusthedispersionu x • Theeffectthat this dispersion has on the actual spatial resolution depends on the detection method [7].…”

Section: 4mentioning

confidence: 99%

Drift chambers

2023

Introduction to Experimental Particle Physics

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“…See Section 2.2 of Ref. [42] for a brief summary and Ref. [43] for details of the application of UV lasers for the calibration of gaseous detectors.…”

Section: Brief History Of the Application Of Lasers To Gaseous Detectorsmentioning

confidence: 99%

A novel technique for the measurement of the avalanche fluctuations of a GEM stack using a gating foil

Kobayashi,

Yumino,

Ogawa

et al. 2022

Preprint

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We have developed a novel technique for the measurement of the size of avalanche fluctuations of gaseous detectors using a gating device (gating foil) prepared for the time projection chamber in the international linear collider experiment (ILD-TPC). In addition to the gating function, the gating foil is capable of controlling the average fraction of drift electrons detected after gas amplification. The signal charge width and shape (skewness) for electron-ion pairs created by a pulsed UV laser as a function of the transmission rate of the gating foil can be used to determine the relative variance of gas gain for single electrons. We present the measurement principle and the result obtained using a stack of gas electron multipliers (GEMs) operated in a gas mixture of Ar-CF 4 (3%)-isobutane (2%) at atmospheric pressure. Also discussed is the influence of the avalanche fluctuations on the spatial resolution of the ILD-TPC.

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“…The physics of the driftprocess and its inherent limitations are summarized elsewhere [7]. It is the aim of this report to give first (in Chapter 2) a review of the main types of central detectors presently under operation or construction.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand field shaping to compensate for the influence of the magnetic field is not possible. Therefore the simple time to space relation of an ideal driftchamber with linear drift trajectories (7) where d is the drift distance, t the measured drift time and VD the drift velocity, can no longer be applied.…”

Section: Introductionmentioning

confidence: 99%