COMPET is a MRI compatible preclinical PET scanner aiming towards a high sensitivity and a high point source resolution (PSR) by implementing a novel block detector geometry. Layers of matrices ...consisting of long LYSO crystals and wavelength shifter (WLS) fibers are used to determine the point of interaction (POI) of the
γ
‐ray
within the LYSO crystal. This reduces the parallax error to a minimum and allows for a high PSR and a high sensitivity, while keeping a low number of readout channels. Simulations show that the detector achieves a PSR below 1
mm in the transaxial plane and a sensitivity of up to 16%.
The ATLAS semiconductor tracker end-cap module Abdesselam, A.; Adkin, P.J.; Allport, P.P. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
06/2007, Letnik:
575, Številka:
3
Journal Article
Recenzirano
The challenges for the tracking detector systems at the LHC are unprecedented in terms of the number of channels, the required read-out speed and the expected radiation levels. The ATLAS ...Semiconductor Tracker (SCT) end-caps have a total of about 3
million electronics channels each reading out every 25
ns into its own on-chip
3.3
μ
s
buffer. The highest anticipated dose after 10 years operation is
1.4
×
10
14
cm
-
2
in units of 1
MeV neutron equivalent (assuming the damage factors scale with the non-ionising energy loss). The forward tracker has 1976 double-sided modules, mostly of area
∼
70
cm
2
, each having
2
×
768
strips read out by six ASICs per side. The requirement to achieve an average perpendicular radiation length of 1.5%
X
0
, while coping with up to 7
W dissipation per module (after irradiation), leads to stringent constraints on the thermal design. The additional requirement of
1500
e
-
equivalent noise charge (ENC) rising to only
1800
e
-
ENC after irradiation, provides stringent design constraints on both the high-density Cu/Polyimide flex read-out circuit and the ABCD3TA read-out ASICs. Finally, the accuracy of module assembly must not compromise the
16
μ
m
(
r
φ
)
resolution perpendicular to the strip directions or
580
μ
m
radial resolution coming from the 40
mrad front-back stereo angle.
A total of 2210 modules were built to the tight tolerances and specifications required for the SCT. This was 234 more than the 1976 required and represents a yield of 93%. The component flow was at times tight, but the module production rate of 40–50 per week was maintained despite this. The distributed production was not found to be a major logistical problem and it allowed additional flexibility to take advantage of where the effort was available, including any spare capacity, for building the end-cap modules. The collaboration that produced the ATLAS SCT end-cap modules kept in close contact at all times so that the effects of shortages or stoppages at different sites could be rapidly resolved.
This paper describes the evaporative system used to cool the silicon detector structures of the inner detector sub-detectors of the ATLAS experiment at the CERN Large Hadron Collider. The motivation ...for an evaporative system, its design and construction are discussed. In detail the particular requirements of the ATLAS inner detector, technical choices and the qualification and manufacture of final components are addressed. Finally results of initial operational tests are reported. Although the entire system described, the paper focuses on the on-detector aspects. Details of the evaporative cooling plant will be discussed elsewhere.
A 3D silicon sensor fabricated at Stanford with electrodes penetrating throughout the entire silicon wafer and with active edges was tested in a 1.4
T magnetic field with a 180
GeV/
c pion beam at ...the CERN SPS in May 2009. The device under test was bump-bonded to the ATLAS pixel FE-I3 readout electronics chip. Three readout electrodes were used to cover the
400
μ
m
long pixel side, this resulting in a p–n inter-electrode distance of
∼
71
μ
m
. Its behavior was confronted with a planar sensor of the type presently installed in the ATLAS inner tracker. Time over threshold, charge sharing and tracking efficiency data were collected at zero and 15° angles with and without magnetic field. The latest is the angular configuration expected for the modules of the Insertable B-Layer (IBL) currently under study for the LHC phase 1 upgrade expected in 2014.
We present a prototype binary readout module for the ATLAS Silicon Tracker employing a newly developed readout chip, SCT128B, using the DMILL radiation hard technology 1. The module design and the ...basic module components including silicon strip sensors, readout chips and a ceramic hybrid are described briefly. The module performance evaluated in the course of lab test and beam test measurements is reported.
The ATLAS Forward Proton (AFP) detector is designed to identify events in which one or two protons emerge intact from the LHC collisions. AFP will consist of a tracking detector, to measure the ...momentum of the protons, and a time of flight system to reduce the background from multiple proton-proton interactions. Following an extensive qualification period, 3D silicon pixel sensors were selected for the AFP tracker. The sensors were produced at CNM (Barcelona) during 2014. The tracker module assembly and quality control was performed at IFAE during 2015. The assembly of the first AFP arm and the following installation in the LHC tunnel took place in February 2016. This paper reviews the fabrication process of the AFP tracker focusing on the pixel modules.
We present a prototype binary readout module for the ATLAS Silicon Tracker employing a newly developed readout chip, SCT128B, using the DMILL radiation hard technology. The module design and the ...basic module components including silicon strip sensors, readout chips and a ceramic hybrid are described briefly. The module performance evaluated in the course of lab tests and beam test measurements is reported.
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