119422558
Experience with a 30 cm2 silicon pixel plane in CERN experiment WA97
Abstract A multi-chip, large area hybrid silicon pixel detector has been integrated in a particle physics experiment for the first time. The plane had 72K 75 μ m × 500 μ m sensor elements, covering a total area of about 30 cm 2 . It was constructed and characterized in a collaboration between heavy-ion experiment WA97 and R&D project RD19. Several such planes will be incorporated in a hyperon telescope, in order to improve tracking in the high multiplicity environment of central lead-lead collisions at the SPS. Results on the characterization of this detector in a proton beam at the Omega spectrometer at CERN are presented and discussed.
186674866
The First Three TILECAL Submodule Assembly in Prague
136300702
RD19: status report on 1993 development of hybrid and monolithic silicon micropattern detectors
120572228
First operation of a 72 k element hybrid silicon micropattern pixel detector array
Abstract We have constructed and tested silicon pixel detector arrays of 96 × 378 (36 288) sensor elements with 75 μm × 500 μm area. The low-noise signal processing circuit associated with each element occupies an identical area on a bump-bonded readout chip. The pixel cell response for ionizing particles is binary with an adjustable threshold between 4000 e − and 15 000 e − . Single chips, the array of 6 ladders and a double array have been characterized in particle test beams and in the Omega experiment WA97 at CERN. The two arrays together, staggered by ∼ 4 mm cover hermetically a 53 mm × 55 mm area with 72 576 pixels. The proportion of properly functioning pixels was 98% in the first 36 k pixel array and 80% in the second one. The ∼ 1% “always-on” pixels could be masked electronically. After masking the rate of “spurious noise hits” was −8 of the identified particle hits while with beam off no hits at all were recorded With a beam trigger most events consisted of a single cluster with a single hit. At the 8000 e − threshold an efficiency > 99% was measured. Tracks were reconstructed with a precision of 22 μm. The proportion of double hits (∼ 11%) depends only slightly on threshold and detector bias voltage, and for these double hits a precision of 10 μm on the particle position was obtained.
136042277
RD19: status report and addendum. Development of hybrid and monolithic silicon micropattern detectors
110037616
The results of mass testing of the plastic streamer tubes for the DELPHI hadron calorimeter
Abstract The procedure and results of mass testing of plastic streamer tubes for the DELPHI hadron calorimeter are described in detail. The mass testing includes three stages: high voltage test and conditioning, X-ray test on radiation load capability and wire tension control in ready detectors. The productivity of the test workshop was 240 detectors per day at maximum. After testing of about 25 000 streamer tubes, 8% have been rejected on the ground of severe rejection criteria which exceed significantly the working conditions in the DELPHI experiment.
126369526
Nucleon high-energy profiles
9612950
High-energy elastic hadron collisions and space structure of hadrons
The elastic and inelastic profiles have been derived from the measured elastic differential cross section data with the help of exact impact parameter representation of elastic scattering amplitude. The results obtained for $pp$ scattering at energy of 53 GeV and $\bar{p} p$ scattering at energy of 541 GeV have been presented. They indicate that nucleons can be regarded as objects characterized by a small core (diameter $\sim$ 0.4$\div$0.8 fm) and a half transparent outer shell (responsible mainly for elastic hadron scattering).
123177126
Quantum mechanical evolution of physical systems and Hilbert space structure
121451892
Physical meaning of the phase of high energy elastic scattering amplitude
The influence of the phaset-dependence on the profiles of high energy elastic hadron scattering in the impact-parameter plane are discussed. The analysis of interference experimental data concerning pp, ¯pp and p4He scattering is summarized. It is shown that in all these cases the high-energy elastic scattering can be interpreted as a peripheral process.
17100968
Realistic theory of microscopic phenomena; a new solution of hidden-variable problem
It has been shown that quantum paradoxes have followed from one special assumption, i.e., from attributing basic physical meaning to Hamiltonian eigenfunctions and representing all physical states by vectors of the Hilbert space spanned on these eigenfunctions. However, any paradoxical properties disappear if the physical states are represented by vectors from the extended Hilbert space on which the scattering theory of Lax and Phillips has been based. On the other side, all stationary characteristics and experimentally verified quantum-mechanical predictions remain the same. The extended mathematical model is also in full agreement with results of EPR experiments, if one takes into account that a further assumption (in addition to locality condition) is involved in derivation of Bell's inequalities as shown recently (see: quant-ph/9808005).