- Author(s):
- Collaboration, CBM
- Corporate author(s) of the document:
- -
- Publishing date:
- 2009-03-02
- Abstract:
- Preface
This report reviews the activities within the CBM project in 2008.
Substantial progress has been made in detector optimization by
realistic feasibility studies, and in the development, construction and
test of hardware components.
The track reconstruction studies for the Silicon Tracking System
(STS) are now based on realistic detector response functions and
cluster finding. A first small STS demonstrator module has been
assembled and tested. The design of the next generation full-size CBM
micro-strip prototype detector has been completed. The development of
radiation hard detectors resulted in a new prototype wafer, designed
and produced in 2008 in cooperation with CIS. The requirements
concerning radiation hardness have been quantified by simulations using
the FLUKA transport code which provided detailed information on the
radiation dose distribution in the cave.
The development of fast algorithms for track and vertex
reconstruction needed for online event selection advanced
significantly. The Kalman filter based track fit used for the Silicon
tracking system has been ported to a graphics card framework, and a
throughput of about 22 million tracks/s has been achieved.
The feasibility studies of open charm identification have been
performed for a detector setup with realistic material budget. The
Micro-Vertex Detector (MVD) model now comprises sensors, cooling and
support structure. The R&D on the MVD concentrates on the
development of radiation hard and fast sensors. A large Monolithic
Active Pixel Sensor with massive parallel read-out has been built and
successfully tested. The construction of a demonstrator is in progress.
The Ring Imaging Cherenkov (RICH) detector has been reduced in
size and number of read-out channels. The RICH design now is based on
commercially available components like glass mirrors and multi-anode
photomultipliers. The ring recognition algorithms have been improved to
cope with the increased ring density. The optimization of the TRD
concept resulted in a reduction of the number of stations and read-out
channels. Real-size high-rate prototype detectors with a double gas
layer and central pad readout are under construction.
The muon detector system has been further optimized with respect
to the number and thickness of absorbers, and the number of detector
layers. Feasibility studies of muon pair reconstruction have been
performed for
several beam energies and collision systems. A dimuon trigger concept
has been developed. Prototype muon tracking chambers based on GEM
technology have been built and tested. A prototype multi-layer
segmented straw-tube detector has been built and tested. This
technology is an option for the large area muon tracking chambers.
The FEE development for the RPC-TOF system proceeded with design
and submission of the PADI preamplifier and GET4 digitizer ASICs.
Studies of the radiation tolerance of UMC 180nm process used for many
CBM ASCIs
gave very promising results.
A major milestone in 2008 was the successful test of detector and
read-out systems with a proton beam at GSI in September 2008. The setup
comprised two double-sided silicon micro-strip detectors and two GEM
detectors coupled to a complete free streaming read-out chain
consisting of front-end electronics (n-XYTER chips), readout
controllers, and the data acquisition system.
In 2008 four institutions joined the CBM collaboration: the
University of Bucharest (Romania), the Institute for Nuclear Research
(Kiev, Ukraine), the Gauhati University (Guwahati, India), the Tsinghua
University (Beijing, China)
- Keywords:
- CBM; Progress Report;
gsi.de