TPG, test results

Author

Ableev, V. ; Ambrosino, F. ; Apollonio, M. ; Bene, P. ; Blondel, A. ; Catanesi, M.G. ; Chiefari, G. ; Chimenti, P. ; Favaron, P. ; Gastaldi, U. ; Giani, S. ; Giannini, G. ; Gschwendtner, E. ; Legrand, J.C. ; Lollo, M. ; Musa, L. ; Musso, G. ; Napolitano,

Author_Institution

Lab. Nazionali di Legnaro, Ist. Nazionale di Fisica Nucl., Legnaro

Volume

52

Issue

6

fYear

2005

Firstpage

2944

Lastpage

2950

Abstract

TPG is the acronym for Time Projection Chamber with GEM amplification, high-granularity hexaboard read-out and FADC electronics. We have constructed a TPG read-out module, called TPG-head, with three GEM foils and a multilayer board, called hexaboard, covered with 710 000 hexagonal pads of 300 mum size. The total active area of this module is a disk of 30 cm diameter. The 710 000 pads are read by three sets of 576 strips dephased by 120 degrees. Each strip is read by a FADC channel with 100 ns sampling time. The module is mounted in a test-bed formed by a cylindrical field cage of 80 cm diameter and 150 cm length inside a solenoidal magnet that operates with a magnetic field up to B=0.7 Tesla. Tests with X-ray sources show an intrinsic spatial resolution of the order of 40 mum. The threshold for transverse momentum measurement of low energy tracks is below 0.1 MeV/c with a magnetic field of 0.07 Tesla. At 0.7 Tesla the intrinsic space point resolution of the chamber is such that the error on the measurement of the transverse momentum is DeltaP_tsime0.1 MeV/c in absence of distortions from the drift region

Keywords

electron multiplier detectors; gas scintillation detectors; nuclear electronics; readout electronics; time projection chambers; 0.07 T; 0.7 T; 300 micron; FADC electronics; GEM amplification; TPG; TPG read-out module; TPG-head; X-ray source; cylindrical field cage; distortion; drift region; energy tracks; gas detector; hexagonal pads; high-granularity hexaboard read-out; intrinsic space point resolution; intrinsic spatial resolution; magnetic field; multilayer board; sampling time; solenoidal magnet; test-bed; time projection chamber; transverse momentum measurement; Detectors; Magnetic field measurement; Magnetic materials; Nonhomogeneous media; Particle measurements; Position measurement; Spatial resolution; Strips; Testing; Volume measurement; GEM; Gaseous detectors; hexaboard; time projection chamber (TPC);

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/TNS.2005.862899

Filename

1589304