JAMES F. JAKOBSEN GRADUATE FORUM 2003 STUDY ON CMS HF LIGHT-GUIDE SYSTEMS IN UNIVERSITY OF IOWA By FIRDEVS DURU DEPARTMENT OF PHYSICS AND ASTRONOMY
Dec 30, 2015
JAMES F. JAKOBSEN GRADUATE FORUM 2003
STUDY ON CMS HF LIGHT-GUIDE SYSTEMS IN UNIVERSITY OF IOWA
ByFIRDEVS DURU
DEPARTMENT OF PHYSICS AND ASTRONOMY
OUTLINE
• LHC projectCMS experimentHF Calorimeter
• Light Guide Tests on:Materials (Al Mylar and HEM )
Shapes ( straight , tapered )Radiation hardness
LHC PROJECT
• LHC (Large Hadron Collider) is an accelerator
• The LHC will be built on the France-Switzerland border west of Geneva
• Will start running at 2007
LHC
• 14 TeV (Center of Mass Energy) proton-proton collisions at every 28 ns. • High Luminosity (1034 cm2s-1).
Raw Data: 1000 Gbit/sRaw Data: 1000 Gbit/s
5 TeraIPS5 TeraIPSEvents:
10 Gbit/sEvents:
10 Gbit/s
10 TeraIPS10 TeraIPS
Controls: 1 Gbit/s
Controls: 1 Gbit/s
To regional centers 622 Mbit/s
To regional centers 622 Mbit/s
CMS networks, farms and data flows
Remote control rooms
Remote control rooms
Controls: 1 Gbit/sControls: 1 Gbit/s
CMS EXPERIMENT
• CMS (Compact Muon Solenoid) detector has been designed to detect cleanly the diverse signatures from new physics by identifying and precisely measuring muons, electrons and photons over a large energy range and at high luminosity.
• The main physics interests:Standard Model (SM) Higgs boson Minimum Supersymmetric Standard Model (MSSM) Higgs bosonsGluino, squark searches.
CMS DETECTOR
Length : 21.6m Diameter : 14.6m
Weight : 14500 tons Four main parts: Magnet, Muon
system, tracking, calorimeter
HF Calorimeter
• 11 m away from interaction point
• Identification of very forward jets from heavy Higgs production
• High radiation region (~1 Grad of radiation field near beam pipe)
• Quartz fibers (QQ, QP)
• Iron as absorber
• LIGHT GUIDES
• PMT’s
PURPOSE OF THE LIGHT GUIDE TESTS
• Test the effect of the light guides on the uniformity of the PMT Signal by measuring the X-Y uniformity and attenuation[Optical properties – mixing]
• Comparison of the tapered light guides vs. non-tapered ones.
• Comparison of the different types of reflective materials (HEM, Al Mylar)
• Test the effect of radiation on two materials
RADIATION TESTS
• Source: Cs137 at 9k Currie
( University of Iowa Hospitals and Clinics, Radiation Laboratories )
• 5 different irradiation levels:
2Mrad, 4Mrad, 6Mrad, 8Mrad, 10Mrad
Irradiated/non-irradiated ratio (HEM)
• Bullet 2mrad
• Box 4mrad• Triangle 6mrad• Star 8mrad• Circle 10mrad