Professor Tony Weidberg: Publications

Status report of the ATLAS SCT optical links.

CERN REPORT 2001:5 (2001) 169-173

Authors:

GD Charlton, JD Dowell, RJ Homer, P Jovanovic, TJ McMahon, G Mahout, JA Wilson, N Kundu, RL Wastie, AR Weidberg, SB Galagedera, J Matheson, CP Macwaters, MC Morrissey, A Rudge, B Skubic, ML Chu, SC Lee, PK Teng, MJ Wang, P Yeh

Abstract:

The ATLAS SCT optical links system is reviewed. The assembly and testing of prototype opto-hamesses are described. Results are also given from a system test of the SCT barrel modules, including optical readout.

System tests of radiation hard optical links for the ATLAS semiconductor tracker

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 443:2 (2000) 430-446

Authors:

DG Charlton, JD Dowell, RJ Homer, P Jovanovic, IR Kenyon, G Mahout, HR Shaylor, JA Wilson, A Rudge, J Fopma, I Mandic, RB Nickerson, P Shield, R Wastie, AR Weidberg, LO Eek, A Go, B Lund-Jensen, M Pearce, J Söderqvist, M Morrissey, DJ White

Abstract:

A prototype optical data and Timing, Trigger and Control transmission system based on LEDs and PIN-diodes has been constructed. The system would be suitable in terms of radiation hardness and radiation length for use in the ATLAS SemiConductor Tracker. Bit error rate measurements were performed for the data links and for the links distributing the Timing, Trigger and Control data from the counting room to the front-end modules. The effects of cross-talk between the emitters and receivers were investigated. The advantages of using Vertical Cavity Surface Emitting Lasers (VCSELs) instead of LEDs are discussed.

Irradiation studies of multimode optical fibres for use in ATLAS front-end links

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 446:3 (2000) 426-434

Authors:

G Mahout, M Pearce, ML Andrieux, CB Arvidsson, DG Charlton, B Dinkespiler, JD Dowell, L Gallin-Martel, RJ Homer, P Jovanovic, IR Kenyon, G Kuyt, J Lundquist, I Mandic, O Martin, HR Shaylor, R Stroynowski, J Troska, RL Wastie, AR Weidberg, JA Wilson, J Ye

Radiation hard optical links for the ATLAS SCT and pixel detectors.

CERN REPORT 2000:10 (2000) 294-298

Authors:

DG Charlton, JD Dowell, RJ Homer, P Jovanovic, G Mahout, HR Shaylor, JA Wilson, RL Wastie, AR Weidberg, S Galagedera, MC Morrissey, JK Troska, DJ White, A Rudge, IM Gregor, ML Chu, SC Lee, PK Teng

Abstract:

The radiation hard opto-electronic links being developed for the ATLAS Semiconductor Tracker (SCT) and Pixel detectors are described. The results of the radiation tests on all the on-detector components are reviewed. Results of environmental tests of irradiated opto-packages are mentioned. New results on Single Event Upset Studies are presented and the implications for ATLAS operation are discussed.Two versions of the ATLAS SCT style on-detector opto-package are described. The performance of these packages are compared to the ATLAS specifications. These packages have been integrated into the SCT system and extensive system tests have been performed. The experience with the assembly of the first larger scale integration is discussed.

Radiation hardness and lifetime of VCSELs and PIN photodiodes for use in the ATLAS SCT

P SOC PHOTO-OPT INS 4134 (2000) 206-213

Authors:

G Mahout, DG Charlton, JD Dowell, IM Gregor, RJ Homer, P Jovanovic, A Kootz, RB Nickerson, R Wastie, AR Weidberg

Abstract:

This paper reports the radiation hardness of optical components to be used in the binary readout of one of the next generation of detectors in high energy physics. The optical components will have to sustain a total ionising dose of 500 kGy and a 1 MeV equivalent neutron fluence of 10(15)n cm(-2). Emitters of VCSEL type have been chosen and have shown a shift of 1 mA in the laser threshold current after irradiation, but are still suitable for our purpose. The epitaxial Si PIN photodiode receivers have an acceptable 30% drop in responsivity providing a higher reverse bias is applied. Speed and lifetime of both components appear to be unaffected by the radiation damage. Temperature characteristics showing differences from un-irradiated materials will be also presented.

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