A steerable UV laser system for the calibration of liquid argon time projection chambers

Ereditato, Antonio; Kreslo, Igor; Lüthi, Matthias; Rudolf von Rohr, Christoph; Schenk, Michael; Strauss, Thomas; Weber, Michael; Zeller, Marcel (2014). A steerable UV laser system for the calibration of liquid argon time projection chambers. Journal of instrumentation, 9(11), T11007. Institute of Physics Publishing IOP 10.1088/1748-0221/9/11/T11007

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A number of liquid argon time projection chambers (LAr TPCs) are being built or are proposed for neutrino experiments on long- and short baseline beams. For these detectors, a distortion in the drift field due to geometrical or physics reasons can affect the reconstruction of the events. Depending on the TPC geometry and electric drift field intensity, this distortion could be of the same magnitude as the drift field itself. Recently, we presented a method to calibrate the drift field and correct for these possible distortions. While straight cosmic ray muon tracks could be used for calibration, multiple coulomb scattering and momentum uncertainties allow only a limited resolution. A UV laser instead can create straight ionization tracks in liquid argon, and allows one to map the drift field along different paths in the TPC inner volume. Here we present a UV laser feed-through design with a steerable UV mirror immersed in liquid argon that can point the laser beam at many locations through the TPC. The straight ionization paths are sensitive to drift field distortions, a fit of these distortion to the linear optical path allows to extract the drift field, by using these laser tracks along the whole TPC volume one can obtain a 3D drift field map. The UV laser feed-through assembly is a prototype of the system that will be used for the MicroBooNE experiment at the Fermi National Accelerator Laboratory (FNAL).

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)

UniBE Contributor:

Ereditato, Antonio; Kreslo, Igor; Lüthi, Matthias; Rudolf von Rohr, Christoph; Schenk, Michael; Strauss, Thomas; Weber, Michael and Zeller, Marcel

Subjects:

500 Science > 530 Physics

ISSN:

1748-0221

Publisher:

Institute of Physics Publishing IOP

Language:

English

Submitter:

Jan Dirk Brinksma-Albrecht

Date Deposited:

21 May 2015 11:48

Last Modified:

24 May 2015 21:31

Publisher DOI:

10.1088/1748-0221/9/11/T11007

ArXiv ID:

1406.6400v3

BORIS DOI:

10.7892/boris.68749

URI:

https://boris.unibe.ch/id/eprint/68749

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