Study of ionization signals in a TPC filled with a mixture of liquid Argon and Nitrogen

This paper describes the design, realization and operation of a prototype liquid Argon Time Projection Chamber (LAr TPC) detector dedicated to the development of a novel online monitoring and calibration system exploiting UV laser beams. In particular, the system is intended to measure the lifetime of the primary ionization in LAr, in turn related to the LAr purity level. This technique could be exploited by present and next generation large mass LAr TPCs for which monitoring of the performance and calibration plays an important role. Results from the first measurements are presented together with some considerations and outlook.

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“…First results have been published on the study of a TPC we have built and operated employing a mixture of LAr and Nitrogen [10].…”

Section: Introductionmentioning

confidence: 99%

A prototype liquid Argon Time Projection Chamber for the study of UV laser multi-photonic ionization

et al. 2009

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“…It is within the range of the two-photon absorption cross-section for liquids [23,24]. The assumption made (hs >> 1, 1 τ << σ i F and σ i F >> σ ex F 2 ) to approximate equation (8) to equation (10) are justified by the experimental data. Moreover, the results are well consistent with the values σ i = 10 −16 -10 −17 cm 2 and τ = 10 −7 -10 −8 s provided by [21,25,26].…”

Section: Measurement Of the Two Photon Absorption Cross Sectionmentioning

confidence: 67%

“…Figure 10 reports the rate of electrons (measured in electron atom −1 s −1 ) as a function of the photon flux (measured in photon cm −2 s −1 ), in a log-log plot. In the investigated intensity range the data are well described by a straight line, and the experimental points are very well fitted with a power law dependence on photon flux F (see equation [9][10][11]. In particular, the best fit is obtained by using equation 10 in the following form:…”

Section: Measurement Of the Two Photon Absorption Cross Sectionmentioning

confidence: 99%

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Monitoring the parameters of a large size liquid Argon Time Projection Chamber using UV laser beams

Rossi¹

2011

J. Phys.: Conf. Ser.

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Measurement of the two-photon absorption cross-section of liquid argon with a time projection chamber I Badhrees, A Ereditato, I Kreslo et al. . The detector we have designed and tested allowed us also to measure the two-photon absorption cross-section (σex) of LAr with unprecedented accuracy and precision, appropriate for using the UV laser technique also for a quantitative calibration of the detector. IntroductionThe liquid Argon Time Projection Chamber (LAr TPC) detector technology allows for uniform and high resolution imaging of massive detector volumes. The operating principle of the LAr TPC is based on the undistorted transport of tracks of ionizing electrons in highly purified LAr by a uniform electric field over distances up to a few metres. Imaging is provided by wire planes or other read-out devices placed at the end of the drift path. The drifting electrons are collected by the outermost wire plane which gives position and calorimetric information. Additional planes with different orientation can be positioned in front of the collection plane to record the signal induced by the passage of the drifting electrons. This provides different projective views of the same event thus allowing space point reconstruction. The third coordinate is given by the measurements of the drift time given by the time interval between the passage of the ionizing particle in the active volume (t 0 ) and the arrival of the drifting electrons on the wire planes. The t 0 can come from the detection of the scintillation light of liquid Argon by means of photomultipliers, or from an external source. The particle momentum of an incoming particle is inferred by the measurement of its multiple scattering [2], while the detection of the local energy deposition provides particle identification. For more information, the reader is referred to [1] and references therein quoted.A very large LAr TPC with a mass ranging from 10 kton to 100 kton would produce an important physics output thanks to the excellent event reconstruction performance [3,4,5,6,7]. The purity of the liquid Argon is a key ingredient to achieve imaging over long drift distances (>5 m), needed for building such a large masses. In particular, a purity corresponding to less than 0.1 ppb of electronegative elements such as Oxygen, has to be achieved in order to allow

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“…Over the years, several TPC's have been built and are in use [23,24,25]. The sizes of the TPCs grew over time with the gained experience, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

High voltage in noble liquids for high energy physics

et al. 2014

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A workshop was held at Fermilab November 8-9, 2013 to discuss the challenges of using high voltage in noble liquids. The participants spanned the fields of neutrino, dark matter, and electric dipole moment physics. All presentations at the workshop were made in plenary sessions. This document summarizes the experiences and lessons learned from experiments in these fields at developing high voltage systems in noble liquids.

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Study of ionization signals in a TPC filled with a mixture of liquid Argon and Nitrogen

Cited by 14 publications

References 17 publications

A prototype liquid Argon Time Projection Chamber for the study of UV laser multi-photonic ionization

A prototype liquid Argon Time Projection Chamber for the study of UV laser multi-photonic ionization

Monitoring the parameters of a large size liquid Argon Time Projection Chamber using UV laser beams

High voltage in noble liquids for high energy physics

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