Büyük hadron-elektron çarpıştırıcısı algıcında radyasyon seviyesi benzetişimi


Thesis Type: Postgraduate

Institution Of The Thesis: Bursa Uludağ University, Fen Bilimleri Enstitüsü, Turkey

Approval Date: 2017

Thesis Language: English

Student: Abdullah Nayaz

Supervisor: ZERRİN KIRCA

Abstract:

The Large Hadron electron Collider (LHeC), a future project proposed at CERN, is designed to collide 60-140 GeV electron/positron beam accelerated in an Energy Recovery Linac (ERL) with the 7 TeV Proton or massive ion beam from existing Large Hadron Collider (LHC) machine. This is planned to be a complementary project for the LHC presenting an expanded range of physics goals especially those associated with leptons and quark-gluon. To accomplish these goals, a multi-purpose 4 pi detector with large acceptance Deep inelastic scattering (DIS) has been designed by the LHeC study group. A high luminosity and therefore an extreme radiation background is expected in the detector due to the high energy colliding beams. The simulation of this radiation is of great importance for estimating the detector damage and predictions over the lifetime of the project. This study presents the preliminary simulations of radiation environment for the LHeC detector using FLUKA Monte Carlo code. Firstly, the geometry of the LHeC detector was constructed in FLUKA using the LHeC detector baseline layout reported in LHeC CDR. The required radiation length X_0 and interaction length for each sub-system were taken into account while defining the new composite materials. Secondly, an electron-proton event data obtained by PYTHIA 6 event generator was run in the newly-built virtual geometry. The essential radiation estimators (Particle Fluence, Dose, NIEL) were predicted in all sub-systems of the LHeC detector. More intense particles fluence is foreseen in the tracker system, particularly in the forward regions. Forward Calorimeters (FEC and FHC) are also exposed to a higher radiation due to 7 TeV proton beams. Besides, for a better understanding of the detector response, the behavior of isotropically sent proton events in the detector is explored.