Configuration of the Operation Modes for a Scintillating Fiber Sub-Detector in LHCb Experiment

  • Tomás Sierra-Polanco Universidad de Ibagué / Universidad del Tolima
  • Diego Milanés Universidad Nacional de Colombia
  • Carlos E. Vera Universidad del Tolima
Palabras clave: Scintillating fibers, particle detectors, VHDL programming, code configuration


In order to develop new techniques for the knowledge of the universe some experiments in elementary particles and high energy physics are proposed, where progress on detector and data acquisition techniques is fundamental. This project presents some improvements for the LHCb upgrade that will be performed in the period between 2018 and 2019 during the Long Shutdown 2 of the CERN experiments in order to configure, improve and re-structure the data acquisition practices. It will emphasize the Scintillating Fibers detector (SciFi), one of LHCb's future sub-detectors in charge of the trace pattern recognition based on the hits occurred on this sub-detector and the recording of significant events in the data transmission.

Due to the proposed changes of the LHCb upgrade, regarding the increase of the luminosity and the collision center-of-mass energy, it is essential to reconsider the digital processes in the data acquisition and their respective processing among the transmission channels, due to the high velocities at which they occur. Therefore, the operation mode configurations in the acquisition digital boards were the aim of this work. And as such, the current condition of the detector and its acquisition techniques and protocols are documented corresponding to their modification.

This paper shows a step-by-step presentation of the modifications applied to the codes to move from a Standard Mode to a Wide Bus Mode, increasing the data rate by means of the quantity reduction of the control bits to enlarge the amount of analyzable information among the events. 


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Biografía del autor/a

Tomás Sierra-Polanco, Universidad de Ibagué / Universidad del Tolima

Estudios de pre grado en la Universidad de Ibagué en el programa de Ingeniería Electrónica. Graduado con asistencia en investigación direccionada a las energías renovables y el diseño de un elevador de voltaje Boost Cuadrático. Estudios de maestría en la Universidad del Tolima. Graduado como magíster laureado en Ciencias-Física con tesis. Trabajo de grado direccionado a la configuración de modos de operación en tarjetas de adquisición de datos en colaboración con el experimento LHCb. Tres años de experiencia docente en la Universidad de Ibagué como Profesor de Tiempo Completo en el área de la Física y el Cálculo de pre-grado para los programas de ingeniería y cursos divulgativos de Mecánica Cuántica.

Diego Milanés, Universidad Nacional de Colombia

Physicist, PhD, Staff Professor, Universidad Nacional de Colombia, Bogotá, Colombia.

Carlos E. Vera, Universidad del Tolima

Physicist, PhD, Staff Professor, Universidad del Tolima, Ibagué, Colombia.


CERN/LHCC. (2014). LHCb Tracker Upgrade Technical Design Report. CERN/LHCC 2014-001, LHCb-TDR-15. The LHCb Collaboration.

LPNHE. (2014). L'équipe LHCb au LPNHE. Document pour le Conseil Scientifique du LPNHE.

Gallas, A. (2012). The LHCb Upgrade. Physics Procedia, volume 37, pp. 151 - 163. doi: 10.1016/j.phpro.2012.02.364

Brown, S., Vranesic, Z. (2009). Fundamentals of Digital Logic with VHDL Design. New York, United States: McGraw-Hill, 3rd Ed.

Floyd, T. L. (2006). Fundamentos de Sistemas Digitales. Madrid, Spain: Pearson Educación S.A, 9th Edition.

Wyllie, K., Alessio, F., Gaspar, C., Jacobsson, R., Le Gac, R., Neufeld, N., Schwemmer, R. (2013). Electronics Architecture of the LHCb Upgrade. LHCb-PUB-2011-011.

Evans L. (2009). The Large Hadron Collider: a Marvel of Technology. Milan, Italy: Fundamental Sciences. CERN & EPFL Press.

Baron, S., Barrios Marin, M. (2014). Draft: GBT-FPGA User Guide. Version 1.01.

Vouters, G., Alessio, F., Cachemiche, J. P., Cap, S., Drancourt, C., Durante, P., Duval, P. Y., Fournier, L., Jevaud, M., Hachon, F., Mendez, J., Rethore, F., T'Jampens, S. (2014). LHCb Upgrade MiniDAQ HandBook. LHCb Technical Report. Revision 2.05.

Bigi, I., Sanda, A. (2009). CP Violation. New York, United States: Cambridge University Press, 2nd Edition.

Branco, G. C., Lavoura, L., Silva, P. (1999). CP Violation. Oxford, England: Clarendon Press.

Muheim, F. (2007). LHCB Upgrade Plans. Nuclear Physics B (Proceedings Supplements), volume 170, pp. 317 - 322. doi: 10.1016/j.nuclphysbps.2007.05.015

Van Beuzekom, M., Buytaert, J., Campbell, M., Collins, P., Gromov, V., Kluit, R., Llopart, X., Poikela, T., Wyllie, K., Zivkovic, V. (2013). VeloPix ASIC Development for LHCb VELO Upgrade. Nuclear Instruments and Methods in Physics Research A, volume 731, pp. 92 - 96. doi: 10.1016/j.nima.2013.04.016

Collins, P. (2013). The LHCb VELO (VErtex LOcator) and the LHCb VELO Upgrade. Nuclear Instruments and Methods in Physics Research A, volume 699, pp. 160 - 165. doi: 10.1016/j.nima.2012.03.047

Joram, C., Haefeli, G., Leverington, B. (2015). Scintillating Fibre Tracking at High Luminosity Colliders. IOP Science Publishing & Sissa Medialab. At:

Alfieri, C., Marangoni M. (2014). R&D on the LHCb SciFi Tracker: Characterisation of Scintillating Fibres and SiPM Photo-Detectors (Master's Thesis). Industrial Engineering and Informatics Faculty, Physics Engineering, Politecnico di Milano.

Guz, Y. (2013). LHCb Calorimeter Upgrade. Proceedings of CHEF, Calorimetry for High Energy Frontiers. pp. 355 - 362. At:

Easo, S. (2014). Upgrade of LHCb-RICH Detectors. Nuclear Instruments and Methods in Physics Research A, volume 766, pp. 110 - 113. doi: 10.1016/j.nima.2014.04.084

LHCb Public Website. (2008). Detector: Tracking System. At:

Cogneras, E., Martinelli, M., Van Tilburg, J., De Vries, J. (2014). The Digitisation of the Scintillating Fibre Detector. LHCb-PUB-2014-003. At:

Ma, K. J., Kang, W. G., Ahn, J. K., Choi, S., Choi, Y., Hwang, M. J., Jang, J. S., Jeon, E. J., Joo, K. K., Kim, H.S., Kim, J. Y., Kim, S. B., Kim, S. H., Kim, W., Kim, Y. D., Lee, J., Lim, I. T., Oh, Y. D., Pac, M. Y., Park, C. W., Park, I. G., Park, K. S., Stepanyan, S. S., Yu, I. (2009). Time and Amplitude of Afterpulse Measured with a Large Size Photomultiplier Tube. Nuclear Instruments and Methods A, volume 629, pp. 93 - 100. doi: 10.1016/j.nima.2010.11.095

ALTERA. (2014). Stratix V GX FPGA Development Board, Reference Manual. ALTERA. MNL-01063-1.5.

Baron S., Cachemiche J. P., Marin F., Moreira P., Soos C. (2009). Implemmenting de GBT Data Transmission Protocol in FPGA's. CERN & CPPM.

Alessio, F., Yves Duval, P., Vouters, G. (2014). Draft: LHCb Upgrade GIT Repository for AMC40 Firmware. LCHb Technical Report.

Moreira, P., Christiansen, J., Wyllie, K. (2015). Draft: GBT Manual. Version 0.6.

Alessio, F., Jacobsson, R. (2011). System-level Specifications of the Timing and Fast Control System for the LHCb Upgrade. CERN-LHCb-PUB-2012-001.

Vouters, G., Alessio, F., Cap, S., Drancourt, C., Fournier, L., T'Jampens, S., Wyllie, K. (2015). Front-end Data Format of the LHCb Upgrade. Revision 3.0.

Cómo citar
Sierra-Polanco, T., Milanés, D., & Vera, C. (2018). Configuration of the Operation Modes for a Scintillating Fiber Sub-Detector in LHCb Experiment. Ciencia E Ingeniería Neogranadina, 28(2), 43-62.