C. Witzig
University of Fribourg
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by C. Witzig.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1997
R. Adler; G. Backenstoss; F. Bal; O. Behnke; P. Bloch; D. Damianoglou; P. Dechelette; M. Dröge; B. Eckart; C. Felder; W. Fetscher; M. Fidecaro; D. Garreta; H.-J. Gerber; P. Gumplinger; D. Guyon; H.U. Johner; B. Lofstedt; J. Kern; P. Kokkas; H. Krause; U. Mall; C.P. Marin; F. Nanni; B. Pagels; P. Pavlopoulos; P. Petit; G. Polivka; Ch. Rhême; T. Ruf
A large-acceptance lead/gas sampling electromagnetic calorimeter (ECAL) was constructed for the CPLEAR experiment to detect photons from decays of π0s with momentum pπ0 ≤ 800 MeV/c. The main purpose of the ECAL is to determine the decay vertex of neutral-kaon decays K0 → π0π0 → 4γ and K0 → π0π0π0 → 6γ. This requires a position-sensitive photon detector with high spatial granularity in r−, ϕ−, and z−coordinates. The ECAL - a barrel without end-caps located inside a magnetic field of 0.44 T - consists of 18 identical concentric layers. Each layer of 13 radiation length (X0) contains a converter plate followed by small cross-section high-gain tubes of 2640 mm active length which are sandwiched by passive pick-up strip plates. The ECAL, with a total of 6X0 has an energy resolution of α(E)E ≈ 13%(E(GeV)and a position resolution of 4.5 mm for the shower foot. The shower topology allows separation of electrons from pions. The design, construction, read-out electronics, and performance of the detector are described.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1992
R. Adler; G. Backenstoss; P. Bloch; D. Damianoglou; P. Dechelette; M. Dröge; C. Felder; W. Fetscher; M. Fidecaro; D. Garreta; H.-J. Gerber; P. Gumplinger; H.U. Johner; J. Kern; P. Kokkas; U. Mall; F. Nanni; C. Witzig
We have designed and tested a gas-sampling calorimeter of high granularity as a prototype for the electromagnetic calorimeter of the CPLEAR experiment. The prototype calorimeter, consisting of 18 layers of 1.5 mm thin lead converters interleaved with a total of 1152 high-gain tubes and 2304 pick-up strips, was tested in a tagged photon beam with photons in the energy range of 50 to 350 MeV. It well fulfilled the requirements of a good detection efficiency for photons above 50 MeV with a spatial resolution σ ≈ 5 mm for the photon conversion point and an energy resolution σ(E)/E ≈ 15%/√E[GeV].
