Ph.D Thesis


Ph.D StudentRonen Lifshitz
SubjectBeam Dynamics Research for the CLIC/CTF3 Study
and Development and Finalization of the Front End
Control Application for ATLAS TGC-DCS
DepartmentDepartment of Physics
Supervisors Full Professors Tarem Shlomit
Full Professors Daniel Schulte


Abstract

The Compact Linear Collider (CLIC) study aims at the next generation of linear colliders. Multi-TeV energies will be achieved by the so-called Two Beam Acceleration (TBA) scheme, where dedicated particle beams are used as a power source for accelerating the main beam. CLIC Test Facility (CTF3) is a demonstration machine being built at CERN, the European Laboratory for Particle Physics near Geneva, Switzerland. CTF3 is used for both power generation feasibility tests, and testing other related technologies.

A full simulation of the CTF3 accelerator has been written and machine stability studies have been performed. In addition, an interface for machine control has been implemented within the simulation context. This infrastructure was used for designing an automatic beam steering system, which has been installed for CTF3. This system was proved to be a useful tool both for machine commissioning, and for benchmarking of the new simulation kernel PLACET (Program for Linear Accelerator Correction Efficiency Tests).

ATLAS is a general-purpose experiment designed to fully exploit the discovery potential of the Large Hadron Collider (LHC) being installed at CERN. Thin Gap Chambers (TGC) are multi-wire gas chamber detectors that will be used as Muon trigger detectors in the end-caps of the ATLAS cylinder. The Muon trigger in ATLAS will detect distinct signatures of interesting events. As a result, operation of the TGC system is crucial for ATLAS. Due to the inaccessibility of ATLAS as well as the high radiation levels, a robust and flexible control system is necessary. The TGC Detector Control System (DCS) is a distributed monitoring and control system for the TGC, which is a part of ATLAS DCS. TGC-DCS is based on a distributed set of intelligent Embedded Local Monitor Boards (ELMB), which are distributed on the detector front-end and connected to a master control station.

ELMBs are standard control nodes developed for all ATLAS subsystems as well as other LHC experiments. However, TGC-DCS requirements from the ELMB are much more demanding than the standard ATLAS-DCS scheme. As a result, an ELMB application dedicated for TGC-DCS has been developed. This application uses the capabilities of the ELMB microcontroller to perform complicated tasks, from complicated hardware-access protocols to autonomous corrective procedures. The experience with TGC-DCS has established this system as a robust and consistent monitoring and control system.