The second level trigger (LV2) system of the FAST detector is described in this paper. The fiber active scintillator target (FAST) is an imaging particle detector intended for muon lifetime ...measurement with a precision of 1 ppm. The aim of the trigger system is to reduce the data throughput that the data acquisition (DAQ) chain must handle to make the experiment able to run with a first level trigger rate of 1 MHz. The electronic system is being designed at CIEMAT (Madrid, Spain). A first prototype was developed and satisfactory results have been obtained under beam operation conditions.
Semitransparent amorphous silicon sensors have been proposed as the 2D positioning sensors for the link system of the CMS alignment. We have developed a general method to characterise these sensors, ...from the signal reconstruction to the beam distortion. First test results with a few sensors are here reported.
The barrel muon chambers of the CMS detector consist of three sets of four layers of rectangular drift tubes. The performance of several prototypes was measured in a muon beam for various ...experimental conditions. Special emphasis was given to study performance aspects related to the trigger capability of the chambers.
Prototype study of the Cherenkov imager of the AMS experiment Aguayo, P.; Aguilar-Benitez, M.; Arruda, L. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
05/2006, Letnik:
560, Številka:
2
Journal Article
Recenzirano
Odprti dostop
The AMS experiment includes a Cherenkov imager for mass and charge identification of charged cosmic rays. A second generation prototype has been constructed and its performances evaluated both with ...cosmic ray particles and with beam ions. In-beam tests have been performed using secondary nuclei from the fragmentation of
20
GeV
/
c
per nucleon Pb ions and
158
GeV
/
c
per nucleon In from the CERN SPS in 2002 and 2003. Partial results are reported. The performances of the prototype for the velocity and the charge measurements have been studied over the range of ion charge
Z
≲
30
. A sample of candidate silica aerogel radiators for the flight model of the detector has been tested. The measured velocity resolution of the detector was found to scale with
Z
-
1
as expected, with a value
σ
(
β
)
/
β
≈
0.7
–
110
-
3
for singly charged particles and an asymptotic limit in
Z of 0.4–
0.6
×
10
-
4
. The measured charge resolution obtained for the
n
=
1.05
aerogel radiator material selected for the flight model of the detector is
σ
(
Z
)
=
0.18
(statistical)
⊕
0.015 (systematic), ensuring a good charge separation up to the iron element, for the prototype in the reported experimental conditions.
The alignment of the L3 forward-backward muon chambers at LEP200 Berdugo, J; Burgos, C; Cerrada, M ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
1997, 1997-1-00, Letnik:
384, Številka:
2
Journal Article
Recenzirano
In order to meet the detection requirements of LEP200, the L3 muon spectrometer was extended to cover the angular range of 44° >
θ > 24°, where θ denotes the polar angle. The new system installed ...consists of three layers of drift chambers attached to the doors returning the flux of the L3 magnetic field. This note is describes in detail the alignment system, relating the central detector to the closest layer of the added forward-backward system as well as the relative alignment between its three layers. The achieved alignment resolutions are 70 μm in
x, 150 μm in
y, and 580 μm in
z, for the link between the central detector and the closest forward-backward layer. For the relative alignment of the three layers 50 μm in
x and
y, and 200 μm in
z are reached.
AMS is a particle physics experiment in space. The purpose is to perform accurate, high statistics, long duration measurements of the spectra of energetic (up to multi-TeV) primary charged cosmic ...rays in space. This article describes the high voltage power supply for the AMS-02. This system was the brick, a set of interconnected modules (boxes) which contains DC/DC converters to generate high voltage from the 28 V DC available from the space station (BOX HV-DC/DC), linear regulators to fine adjust the voltage of each photomultiplier (BOX HV-LinReg) and logic board with the digital link that sets and monitors the various voltages (xPSC).
The development of the barrel drift chambers for the CMS muon detector at the CERN
Large Hadron Collider is supported by a variety of simulation calculations, based on the GARFIELD drift chamber ...simulation program and the GEANT detector simulation package. This study surveys the results influencing the actual chamber design. The dependence of the drift cell performance on shape and position of the cell electrodes as well as on the mechanical tolerances is shown. The results obtained for space-time relation and spatial resolution are in good agreement to test beam measurements on prototypes.
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