Advanced Visualizations Tools for CERN Institutional Data

Project Specification: The aim of this openlab summer student project is to provide intuitive and powerful visualisation tools for key institutional data about CERN, including budgets and contracts. The project will be done in collaboration with the Open Knowledge Foundation under the framework of CERN's open data policy regarding scientific results from LHC. The student will use the model-view-controller web development framework with Flask/HTML5/jQuery/TwitterBootstrap technologies for the user interface and SQLAlchemy ORM for database persistence. Abstract: CERN’s Open Access Policy says that “all results of its experimental and theoretical work shall be published or otherwise made generally available”. Following that, CERN has reached a collaboration agreement with the Open Knowledge Foundation in order for CERN to publish and visualize institutional data. As part of this collaboration, we will develop a module for showing this data in a graphical way in the CERN side and a tool in the Open Knowledge Foundation site for automatizing the input of data

Higgs bundles, abelian gerbes and cameral data

We study the Hitchin map for $G_{\mathbb{R}}$-Higgs bundles on a smooth curve, where $G_{\mathbb{R}}$ is a quasi-split real form of a complex reductive algebraic group $G$. By looking at the moduli stack of regular $G_{\mathbb{R}}$-Higgs bundles, we prove it induces a banded gerbe structure on a slightly larger stack, whose band is given by sheaves of tori. This characterization yields a cocyclic description of the fibres of the corresponding Hitchin map by means of cameral data. According to this, fibres of the Hitchin map are categories of principal torus bundles on the cameral cover. The corresponding points inside the stack of $G$-Higgs bundles are contained in the substack of points fixed by an involution induced by the Cartan involution of $G_{\mathbb{R}}$. We determine this substack of fixed points and prove that stable points are in correspondence with stable $G_{\mathbb{R}}$-Higgs bundles.Comment: 34 page

Thermal Analysis of the ALICE Detector for the LHC

In the same fashion as for the other LHC detectors, ALICE requires stringent conditions of temperature stability in time and space and adequate absolute values, which vary for each sub-detector. For the design of the cooling and ventilation systems inside the detector, three different studies have been undertaken. The first investigates the temperature distribution and hot spots in the volume enclosed by the L3 magnet for different ventilation configurations. The second study deals with the cooling of the muon chambers inside the dipole magnet and, in particular, analyses the possibility of air-cooling pairs of muon chambers to remove the residual heat flux by forced convection. The third study examines the contribution of the surroundings to the temperature gradients in the drift gas (Ne/CO2) of the TPC sub-detector. The different computational results will be shown and some design proposals presented

Thermal Behaviour of the Preshower Galvanic Feedthrough

The active components of the read-out planes in the CMS Preshower work at a temperature of about -10oC. An assembled Preshower detector appears as a closed vessel. Electrical services have to cross this container in a gas-tight manner, and they have to be disconnectable from both Preshower outside and inside. To this end, special gas-tight feedthroughs have been designed. As they are located on the cold/warm barrier, their heat inleak can be a potential source of problems. Condensation on the outside surface shall be avoided. This paper presents the behaviour of two different configurations is presented and resulting temperature values at the external surface are compared to the guaranteed maximum dew point temperature

Gauge-gravity duality with flavor branes

Since the holographic duality was proposed by Maldacena in 1997 it has been generalised in order to study a wide range of problems. One prominent example among the variety of extensions of the duality is the addition of flavor degrees of freedom as a result of the inclusion of supplementary D-branes on the initial system. The main goal of this thesis is the application of the correspondence in two particular situations where fields transforming in the fundamental representation of the gauge group are taken into account. In order to do so, we will study a system of intersecting D3 and D5 branes. In the first part, we will try to gain some insight into periodically driven systems, while the second part will be devoted to the construction of a holographic dual that realises anistropy, as well as a finite baryon density