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FoCal High Granularity Prototype Testing at CERN: Results and Future Plans

This document summarizes the activities and findings from the FoCal high granularity prototype tests conducted at CERN during March 2014, including test beam periods at PS and SPS. It highlights the data analysis, calibration challenges, and the ongoing simulations from previous data sets. The document also covers the participation in upcoming conferences and the results from previous test beams at DESY, detailing the performance of the digital prototype and the alignment procedures for improved spatial resolution.

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FoCal High Granularity Prototype Testing at CERN: Results and Future Plans

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  1. FoCalhighgranularityR&D Elenarocco Nikhef– Utrecht university Cern–alice week, march 2014

  2. CERN test beams 2014 with focal prototype (low+HIGH layer granularity) • We asked for 2 test beam periods: • PS: 2 weeks at T9 (mixed beams: e-, π) in September; • SPS: 1 week at H6 (high energy electron beam; mixed beams) in December. • PS-SPS schedule (preliminary) • https://sps-schedule.web.cern.ch/sps-schedule/ E. Rocco - FoCal meeting- ALICE week CERN

  3. Focal presentation & publications 2014 • Incoming conferences (up to now): • Quark Matter: poster accepted • TIPP2014: accepted contribution (speaker: T. Chujo) • ICHEP 2014: contribution to be submitted (spekear E. Rocco) • …. • Past conferences: • - ICTR-PHE 2014: poster (authors: D. Aadnevik, E. Rocco)(proton therapy) E. Rocco - FoCal meeting- ALICE week CERN

  4. High granularity prototype E. Rocco - FoCal meeting- ALICE week CERN

  5. Utrecht current activities • 1.Data analysis and simulations ongoing on the previous data set (2012 PS &SPS data) -> problems on chips calibration • calibration using clustersize for pion tracks • charge diffusion implementation E. Rocco - FoCal meeting- ALICE week CERN

  6. Utrecht activities: simulation data ER= 6,2% ER= 5,2% A factor of 2 of difference E. Rocco - FoCal meeting- ALICE week CERN

  7. Utrecht activities: • 2. Continuously data taking with cosmic data: • - noise calibration (done!) • - noise time stability • - complementing the info of the prototype for different threshold settings to Cosmic data after“calibration” Cosmic data before “calibration” E. Rocco - FoCal meeting- ALICE week CERN

  8. Utrecht activities: Uniformity within the layer, missing channels E. Rocco - FoCal meeting- ALICE week CERN

  9. Utrecht activities: What about the cluster size for tracks? E. Rocco - FoCal meeting- ALICE week CERN

  10. Utrecht activities: Before alignment • 3. Alignment is important to properly estimate the shower shape (lateral) After alignment ~40 μm spatial resolution, but it is just first iteration E. Rocco - FoCal meeting- ALICE week CERN

  11. Test beam at DESY – February 2014 • Parasitic beam users, nevertheless in 1 week of data taking (mostly night shifts) we collected enough statistics for the following energies: • 2, 3, 4, 5(just few runs) and 5,4 GeV • At 2 GeV 3 different threshold settings (low, standard, high) • Participants: • Bergen group: S. Yang, D. Joshi, D. Aadnevik • Utrecht group: G-J Nooren , T. Van Brink, M. Reicher, C. Zhang, H. Wand, M. Dietze, M. Mohammadi, E. Rocco. E. Rocco - FoCal meeting- ALICE week CERN

  12. some shower examples at 5.4 GeV Front view E. Rocco - FoCal meeting- ALICE week CERN

  13. some shower examples at 5.4 GeV Side view E. Rocco - FoCal meeting- ALICE week CERN

  14. Hits distribution scan in energy E. Rocco - FoCal meeting- ALICE week CERN

  15. Longitudinal profile (2 vs 5.4 GeV) Layer 5 (missing channels) Still problems with missing channels/chips E. Rocco - FoCal meeting- ALICE week CERN

  16. Very close look to the shower E. Rocco - FoCal meeting- ALICE week CERN

  17. Conclusions • FoCal prototype willbe tested at CERN at PS and SPS. • Current activities on the digital prototype: • The digital prototype has been tested at DESY with new chip settings and preliminary results show improved performance (ongoing analysis). • Analyses of the previous data: ongoing • Chip software alignment procedure: ongoing • Simulations studies: ongoing • Future activity: • Test beam at CERN at the SPS • Presentation of the FoCal performance at several conferences E. Rocco - FoCal meeting- ALICE week CERN

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