6 research outputs found
Performance test of a micro-pattern stereo detector with two gas electron multipliers [online]
We report on the performance of a large micro-pattern detector
with two gas electron multiplier foils (GEM) and a two-layer
readout structure at ground potential. The two readout layers
each have a 406 micro-m pitch and cross at an effective angle of
6.7 degrees. This structure allows for two orthogonal
coordinates to be determined. Using a muon beam at CERN together
with a silicon tracking system, the position resolutions of the
two coordinates are measured to be 50 micro-m and 1 mm
respectively (1 stand.dev.). The muon detection efficiency for
the two-dimensional space points reaches 96%. The detector was
found to be well operational over a wide range in the settings
of the different electrical fields
Construction and performance of a micro-pattern stereo detector with two gas electron multipliers [online]
The construction of a micro-pattern gas detector of dimensions
40 x 10 cm² is described. Two gas electron multiplier foils
(GEM) provide the internal amplification stages. A two-layer
readout structure was used, manufactured in the same technology
as the GEM foils. The strips of each layer cross at an effective
crossing angle of 6.7 degrees and have a 406 micro-m pitch. The
performance of the detector has been evaluated in a muon beam at
CERN using a silicon telescope as reference system. The position
resolutions of two orthogonal coordinates are measured to be
50 micro-m and 1 mm, respectively. The muon detection efficiency
for two-dimensional space points reaches 96%.
Key words:
detector, position sensitive, GEM, two-layer readou
Integration of the End Cap TEC+ of the CMS Silicon Strip Tracker
The silicon strip tracker of the CMS experiment has been completed and inserted into the CMS detector in late 2007. The largest sub-system of the tracker is its end cap system, comprising two large end caps (TEC) each containing 3200 silicon strip modules. To ease construction, the end caps feature a modular design: groups of about 20 silicon modules are placed on sub-assemblies called petals and these self-contained elements are then mounted into the TEC support structures. Each end cap consists of 144 petals, and the insertion of these petals into the end cap structure is referred to as TEC integration. The two end caps were integrated independently in Aachen (TEC+) and at CERN (TEC--). This note deals with the integration of TEC+, describing procedures for end cap integration and for quality control during testing of integrated sections of the end cap and presenting results from the testing
Reception Test of Petals for the End Cap TEC+ of the CMS Silicon Strip Tracker
The silicon strip tracker of the CMS experiment has been completed and was inserted into the CMS detector in late 2007. The largest sub system of the tracker are its end caps, comprising two large end caps (TEC) each containing 3200 silicon strip modules. To ease construction, the end caps feature a modular design: groups of about 20 silicon modules are placed on sub-assemblies called petals and these self-contained elements are then mounted onto the TEC support structures. Each end cap consists of 144 such petals, which were built and fully qualified by several institutes across Europe. Fro
Infrared LED Array For Silicon Strip Detector Qualification
The enormous amount of silicon strip detector modules for the CMS tracker requires a test-sytem to allow qualification of each individual detector module and its front-end electronics within minutes. The objective is to test the detector with a physical signal. Signals are generated in the detector by illumination with lightpulses emitted by a LED at 950~nm and with a rise time of 10~ns. In order to avoid a detector moving, an array of 64 LEDs is used, overlaping the complete detector width. The total length of an array is 15~cm. The spot size of an individual LED is controlled by apertures to illuminate about 25 strips. Furthermore it is possible to simulate the high leakage current of irradiated sensors by constant illumination of the sensor. This provides an effective mean to identfy pinholes on a sensor
Petal Integration for the CMS Tracker End Caps
This note describes the assembly and testing of the 292 petals built for the CMS Tracker End Caps from the beginning of 2005 until the summer of 2006. Due to the large number of petals to be assembled and the need to reach a throughput of 10 to 15 petals per week, a distributed integration approach was chosen. This integration was carried out by the following institutes: I. and III. Physikalisches Institut - RWTH Aachen University; IIHE, ULB \& VUB Universities, Brussels; Hamburg University; IEKP, Karlsruhe University; FYNU, Louvain University; IPN, Lyon University; and IPHC, Strasbourg University. Despite the large number of petals which needed to be reworked to cope with a late-discovered module issue, the quality of the petals is excellent with less than 0.2\% bad channels