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ABSTRACT: A supersonic beam source is described which continuously generates a gas curtain for the proton beam profile observation in the Intersecting Storage Rings at CERN. Its maximum intensity is 1020 atoms/sr s. A commonly used theoretical model for the determination of the intensity downstream of the source is discussed. Some results about the condensation behaviour of sodium vapour on metallic substrate surfaces are reported.
Journal of Physics E Scientific Instruments 02/2001; 8(5):360.
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B.E. Anderson,
K. Anderson,
A. Charalambous,
A. Cotta-Ramusino,
M. Dallavalle,
H. Evans,
A. Eyring,
M. Foucher,
R. Giacomelli,
A. Giles, [......],
M. Mannelli,
U. Mueller,
J. Pilcher,
O. Runolfsson,
B. Schmitt,
W. Springer,
D. Strom,
M. Tecchio,
D. Wagner, K. Zankel
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ABSTRACT: A pair of small angle silicon-tungsten (Si-W) calorimeters has
been built to measure the luminosity to a precision better than 0.1% in
the OPAL experiment at the Large Electron Positron (LEP) collider at
CERN near Geneva. Each calorimeter contains 19 layers of tungsten (W)
plates and silicon (Si) detectors, corresponding to a total of 22
radiation lengths, sampled by about 1 m<sup>2</sup> of detectors divided
into 304×64 independently read out channels. A complete
electronics system has been developed, from the preamplifier up to the
VME read out and control interface. It includes a fast trigger based on
analogue sums. This paper describes how a large number of channels have
been implemented in a dense environment, thanks to the use of ASIC's
directly bonded on the detector
IEEE Transactions on Nuclear Science 09/1994; · 1.45 Impact Factor
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IEEE Transactions on Nuclear Science 07/1975; · 1.45 Impact Factor
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H.M. Fischer,
M. Hauschild,
H. Hartmann,
A. Hegerath,
H. Boerner,
H.J. Burckhart,
M. Dittmar,
R. Hammarström,
R.D. Heuer,
L. Mazzone, [......],
H.E. Stier,
A. Weltin,
P. Bock,
J. Heintze,
P. Igo-Kemenes,
P. Lennert,
R. Rusniak,
P. Von Walter,
A. Wagner,
J. Zimmer
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ABSTRACT: The concept of a jet chamber for the central detector of OPAL has been tested with a full scale prototype. The design of this prototype, its mechanical and electrical structure and its support system for high voltage, gas, laser calibration and readout are described. Operating experience has been gathered since summer 1984. The chamber performance in terms of spatial resolution and particle identification capability is given.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment.
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A Beer,
Franco Bonaudi,
L Bonnefoy,
Michel Borghini,
F Bourgeois,
A G Clark,
J M Chapuis,
Y Cholley,
A Corre,
G Critin, [......],
Livio P Mapelli,
J. P. Marcelin,
H Pflumm,
J Ringel,
A F Rothenberg,
G A Schuler,
J L Siegrist,
A Sigrist,
P Wicht, K Zankel
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H. Breuker,
H.M. Fischer,
M. Hauschild,
H. Hartmann,
B. Wünsch,
H. Boerner,
H.J. Burckhart,
M. Dittmar,
R. Hammarström,
R.D. Heuer, [......],
K. Runge,
O. Schaile,
J. Schwarz,
H.E. Stier,
A. Weltin,
P. Bock,
J. Heintze,
P. Igo-Kemenes,
P. Lennert,
A. Wagner
[show abstract]
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ABSTRACT: An important goal of the OPAL jet chamber is particle identification at high momenta by exploiting the relativistic rise of the energy loss. Extensive tests have been performed with the full scale prototype of the OPAL jet chamber to measure the energy loss in an argon-methane-isobutane mixture as function of momentum and particle species. The measurements were done under various operating conditions in order to optimise the operating point, to investigate sources of systematic errors, to monitor the stability of the energy loss measurement and to develop calibration procedures. The particle separation capability in the region of the relativistic rise has been studied at gas pressures of 3 and 4 bar. The adopted operating point represents a reasonable compromise between the requirements for particle identification and tracking accuracy.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment.
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A. Beer,
F. Bonaudi,
L. Bonnefoy,
M. Borghini,
F. Bourgeois,
A.G. Clark,
J.-M. Chapuis,
Y. Cholley,
A. Corre,
G. Critin, [......],
L. Mapelli,
J.-P. Marcelin,
H. Pflumm,
J. Ringel,
A. Rothenberg,
G. Schuler,
J.L. Siegrist,
A. Sigrist,
P. Wicht, K. Zankel
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ABSTRACT: The highly segmented electromagnetic and hadronic calorimeter of the UA2 experiment has been successfully operated at the CERN p Collider for more than 3 years. The mechanical design and construction technique of the calorimeter as well as its performance and stability in test beams and at the p Collider are described in detail.
Nuclear Instruments and Methods in Physics Research.
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OPAL Collaboration,
K Ahmet,
MZ Akrawy,
G Alexander,
J Allison,
PP Allport,
BE Anderson,
KJ Anderson,
JC Armitage,
RL Armstrong, [......],
S Yamada,
H Yamashita,
G Yekutieli, K Zankel,
T Zawistowski,
W Zeuner,
J Zimmer,
GT Zorn,
N Zwang,
S. Zylberajch
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ABSTRACT: The electrostatic properties and the performances of very long jet chambers have been investigated. Using 100 MHz FADC wave form digitisers, the tracking accuracy, the charge division and the performance of two chambers, one with 4.5 m long tungsten wires and one with 4 m long highly resistive “NiCoTi” wires have been studied. The geometry of the chambers was chosen to define some of the design parameters of the jet chamber for the OPAL detector for LEP.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment.
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D Creanza,
M De Palma,
G Maggi,
G Selvaggi,
L Silvestris,
G Raso,
P Tempesta,
M Burns,
P Coyle,
M Frank, [......],
S N Black,
J H Dann,
H Y Kim,
L Bosisio,
J Pütz,
J E Rothberg,
S R Wasserbaech,
P Elmer,
J Walsh, K Zankel
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ABSTRACT: The ALEPH collaboration, in view of the importance of effective vertex detection for the Higgs boson search at LEP 2, decided to upgrade the previous vertex detector. Main changes were an increased length (±20 cm), a higher granularity for rφ view (50 µm), a new preamplifier (MX7 rad hard chip), a polymide (upilex) fan-out on z side to carry the signals from the strips to the front-end electronics outside the fiducial region reducing consequently the passive material in the central region by a factor of two. The detector, the running experience and its performance will be described.
