The ALICE Detector Control System Chochula, P; Jirden, L; Augustinus, A ...
IEEE transactions on nuclear science,
04/2010, Volume:
57, Issue:
2
Journal Article
Peer reviewed
Open access
ALICE is one of the six currently installed experiments at the Large Hadron Collider (LHC) at CERN (Geneva, Switzerland). The experiment saw its first particles during the commissioning of the LHC ...accelerator in 2008 and is now preparing for the first physics runs foreseen for the autumn of 2009. The experiment is composed of a large number of sub-detectors, each with up to 15 different subsystems that need to be controlled and operated in an efficient and reliable way. For this purpose, a Detector Control System (DCS) has been developed based on latest technologies and using new and innovative approaches. The DCS system has been used with success during the commissioning of the individual detectors as well as during the cosmic runs and the LHC injection tests that were carried out in 2008. This paper gives an overview of the control system and it describes the architecture, the tools and the components that have been used to build it. Examples of technical implementations are given and new trends and techniques used in the system are highlighted.
The ALICE Configuration Tool Boccioli, M; Carena, F; Chapeland, S ...
Journal of physics. Conference series,
12/2011, Volume:
331, Issue:
2
Journal Article
Peer reviewed
Open access
ALICE (A Large Ion Collider Experiment) is the heavy-ion detector designed to study the physics of strongly interacting matter and the quark-gluon plasma at the CERN Large Hadron Collider (LHC). It ...includes 18 different sub-detectors and 5 online systems, each one made of many different components and developed by different teams inside the collaboration. The operation of a large experiment over several years to collect billions of events acquired in well defined conditions requires predictability and repeatability of the experiment configuration. The logistics of the operation is also a major issue and it is mandatory to reduce the size of the shift crew needed to operate the experiment. Appropriate software tools are therefore needed to automate daily operations. This ensures minimizing human errors and maximizing the data taking time. The ALICE Configuration Tool (ACT) is ALICE first step to achieve a high level of automation, implementing automatic configuration and calibration of the sub-detectors and online systems. This presentation describes the goals and architecture of the ACT, the web-based Human Interface and the commissioning performed before the start of the collisions. It also reports on the first experiences with real use in daily operations, and finally it presents the road-map for future developments.
The ALICE Collaboration has measured inclusive J/psi production in pp collisions at a center of mass energy sqrt(s)=2.76 TeV at the LHC. The results presented in this Letter refer to the rapidity ...ranges |y|<0.9 and 2.5
The control systems developed for large high energy physics experiments usually do not have strict real time constraints. On the other hand, the correct functionality of detector electronics cannot ...be achieved without a reliable control system. Different architecture and operational principles of fast front-end electronic modules and complex SCADA systems create a challenge for overall design and integration. In the presentation we describe the Detector Control System of ALICE one of the 4 LHC experiments at CERN. Eighteen sub-detectors based on different technologies, control architectures and operational requirements need to be integrated into a coherent system allowing for centralized operation. We describe the strategy used in ALICE with focus on the operation of front-end electronics. A standardized software abstraction level allows for unified operation of modules, hiding the complexity of the underlying hardware architecture and represents the different front-ends as devices reacting to the same set of commands. We describe the software implementation of this approach and its integration into the central system. On vertical slices of the system we explain the implementation principles covering the full chain from the configuration database to device registers. The read-back data carries information on the device status and conditions. It provides feedback to the operators as well as to the monitoring and data analysis software. We explain how the data flow is organized in ALICE and how it is used to allow for operation of millions of readout channels by a single operator in a smooth and efficient way.
The ALICE detector control system Chochula, P.; Jirden, L.; Augustinus, A. ...
2009 16th IEEE-NPSS Real Time Conference
Conference Proceeding
Open access
ALICE is one of the six currently installed experiments at the Large Hadron Collider (LHC) at CERN (Geneva, Switzerland). The experiment saw its first particles during the commissioning of the LHC ...accelerator in 2008 and is now preparing for the first physics runs foreseen for the autumn of 2009. The experiment is composed of a large number of sub-detectors, each with up to 15 different subsystems that need to be controlled and operated in an efficient and reliable way. For this purpose, a Detector Control System (DCS) has been developed based on latest technologies and using new and innovative approaches. The DCS system has been used with success during the commissioning of the individual detectors as well as during the cosmic runs and the LHC injection tests that were carried out in 2008. This paper gives an overview of the control system and it describes the architecture, the tools and the components that have been used to build it. Examples of technical implementations are given and new trends and techniques used in the system are highlighted.
Nuclear reactions play a key role in the framework of the Big Bang Nucleosynthesis. A network of 12 principal reactions has been identified as the main path that drove the elemental nucleosynthesis ...in the first 20 min of the history of the Universe. Among them an important role is played by neutron-induced reactions, which, from an experimental point of view, are usually a difficult task to be measured directly. Nevertheless big efforts in the last decades have led to a better understanding of their role in the primordial nucleosynthesis network. In this work we apply the Trojan Horse Method to extract the cross section at astrophysical energies for the
3
He
(n,p)
3
H
reaction after a detailed study of the
2
H
(
3
He
,pt)H three-body process. Data extracted from the present measurement are compared with other published sets.
In the network of reactions present in the Big Bang nucleosynthesis, the 3He(n, p)3H reaction has an important role which impacts the final 7Li abundance. The Trojan Horse Method (THM) has been ...applied to the 3He(d, pt)H reaction in order to extract the astrophysical S(E)-factor of the 3He(n, p)3H reaction in the Gamow energy range. The experiment will be described in the present work together with the first preliminary results.
In the network of reactions present in the Big Bang nucleosynthesis, the 3He(n, p)3H has an important role which impacts the final 7Li abundance. The Trojan Horse Method (THM) has been applied to the ...3He(d, pt)H reaction in order to extract the astrophysical S(E)-factor of the 3He(n, p)3H in the Gamow energy range. The experiment will be described in the present work together with the first preliminary results.
Abstract
In the network of reactions present in the Big Bang nucleosynthesis, the
3
He(n, p)
3
H reaction has an important role which impacts the final
7
Li abundance. The Trojan Horse Method (THM) ...has been applied to the
3
He(d, pt)H reaction in order to extract the astrophysical S(E)-factor of the
3
He(n, p)
3
H reaction in the Gamow energy range. The experiment will be described in the present work together with the first preliminary results.
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