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19 April 2024 |
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A Large Ungated TPC with GEM Amplification | | M. Berger
; M. Ball
; L. Fabbietti
; B. Ketzer
; R. Arora
; R. Beck
; F. Böhmer
; J.-C. Chen
; F. Cusanno
; S. Dørheim
; J. Hehner
; N. Herrmann
; C. Höppner
; D. Kaiser
; M. Kis
; V. Kleipa
; I. Konorov
; J. Kunkel
; N. Kurz
; Y. Leifels
; P. Müllner
; R. Münzer
; S. Neubert
; J. Rauch
; C.J. Schmidt
; R. Schmitz
; D. Soyk
; M. Vandenbroucke
; B. Voss
; D. Walther
; J. Zmeskal
; | | Date: |
16 Feb 2017 | | Abstract: | A Time Projection Chamber (TPC) is an ideal device for the detection of
charged particle tracks in a large volume covering a solid angle of almost
$4pi$. The high density of hits on a given particle track facilitates the task
of pattern recognition in a high-occupancy environment and in addition provides
particle identification by measuring the specific energy loss for each track.
For these reasons, TPCs with Multiwire Proportional Chamber (MWPC)
amplification have been and are widely used in experiments recording heavy-ion
collisions. A significant drawback, however, is the large dead time of the
order of 1 ms per event generated by the use of a gating grid, which is
mandatory to prevent ions created in the amplification region from drifting
back into the drift volume, where they would severely distort the drift path of
subsequent tracks. For experiments with higher event rates this concept of a
conventional TPC operating with a triggered gating grid can therefore not be
applied without a significant loss of data. A continuous readout of the signals
is the more appropriate way of operation. This, however, constitutes a change
of paradigm with considerable challenges to be met concerning the amplification
region, the design and bandwidth of the readout electronics, and the data
handling. A mandatory prerequisite for such an operation is a sufficiently good
suppression of the ion backflow from the avalanche region, which otherwise
limits the tracking and particle identification capabilities of such a
detector. Gas Electron Multipliers (GEM) are a promising candidate to combine
excellent spatial resolution with an intrinsic suppression of ions. In this
paper we describe the design, construction and the commissioning of a large TPC
with GEM amplification and without gating grid (GEM-TPC). | | Source: | arXiv, 1702.5093 | | Services: | Forum | Review | PDF | Favorites | |
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