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8th Workshop on Electronics for LHC Experiments Outlook

This workshop provides an overview of the system tests for the CMS Tracker, including the integration activities at CERN, the different components of the tracker system, and the overall status of the electronics. It also discusses the motivation and definition of the system tests, the validation of the system, and the measurements and operations performed to validate the system. The workshop also covers the general integration activities at CERN, including lab setups, beam tests, and synchronization strategies.

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8th Workshop on Electronics for LHC Experiments Outlook

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  1. CMS Microstrip Silicon Tracker System Tests 8th Workshop on Electronics for LHC Experiments Outlook • Motivation/definition • General integration activity at CERN • Inner Barrel • Outer Barrel • End-Caps • Conclusions N. Marinelli on behalf of the CMS Tracker Collaboration N. Marinelli Imperial College-London

  2. End-Cap (TEC) Inner Barrel (TIB) Outer Barrel (TOB) The CMS Tracker Different geometry Same control and read-out architectures Same powering scheme N. Marinelli Imperial College-London

  3. Tracker read-out and control architecture Detector Counting Room N. Marinelli Imperial College-London

  4. Control architecture-More details N. Marinelli Imperial College-London

  5. Overall status of the electronics • ASICs final and frozen orders for pre-production placed • Optical link procurement under way • DAQ interface (FED) first final card in November • Control electronics used since the beginning final FEC defined • Hybrids need some additional work N. Marinelli Imperial College-London

  6. About APV25 End of last year (25ns Beam Test) unexpected effects observed in the APVs caused by Highly Ionizing Particles Large amplitude signal Saturated low baseline Activity in subsequent detectors Proton beam at PSI + simulation checks No need for concern See dedicated talk R. Bainbridge in Par. Sess. A4 N. Marinelli Imperial College-London

  7. Motivation/definition of System Test The CMS Tracker System is not just a collection of well working single components Adding new components in the system and/or refining some of them towards the final version implies iterative work and debugging The step-by-step integration activity started more than a year ago …. and it is progressing …. Until it will converge in the final working Tracker… N. Marinelli Imperial College-London

  8. Motivation/definition of System Test (1) Full scale production phase approaching Need to validate a complete sub-set of the Tracker and prove that it works • A sub-set is a petal (TEC) or a rod (TOB) or a string (TIB)i.e. • a number of final modules(sensors + front-end hybrids) integrated • in the final mechanical support structure and fully equipped with • interconnect bus/boards • optical digital links and electronics for control • optical analogue links for readout • power supplies (HV and LV) + 100m MSCable • cooling • Integrate/optimize the single components • Validate designs • Tune design details N. Marinelli Imperial College-London

  9. Modules Control Chain • Leakage currents in the sensors • Noise level • APVs settings tuning • Calibration • Absolute S/N (-source, beam) • Noise immunity (cabling,shielding, grounding) • Operation margin • Redundancy scheme Read-Out Chain • Analogue optical links calibration (gain and bias point) • Noise contributions • Common Mode effects • Operation margin Stability of the system vs temperature vs time Measurements/operations to perform in order to validate the system Synchronization • relative module to module • absolute beam/source N. Marinelli Imperial College-London

  10. Signal integrity Power distribution Measurements/operations to perform in order to validate the system Interconnect boards Mechanics • Compatibility of components within mechanical framework • Stress of modules • Deformations due to cooling distribution of the fast control signals: clock, reset and back plane pulses • Voltage drops: uniformity in supply voltage distribution • Full loaded system: what happens if current suddenly changes because of • large inductance in long cable and • power supplies slow reaction time ? Environmental Parameters • temperatures of the modules • temp of various components • humidity N. Marinelli Imperial College-London

  11. General integration activity at CERN • Lab setting up and debugging • including software development for • testing • commissioning • control • DAQ (XDAQ) • calibration & synchronization procedures • slow controls and monitoring for temperature, humidity, voltages • Beam Tests (more recent) • CERN 25 ns beam (Nov 2001) • Proton beam PSI (May 2002) • CERN (Aug-Sep 2002) N. Marinelli Imperial College-London

  12. In the Labs Typical lab set-up for single-module qualification Electrical read-out and temporary interface cards Temporary FED and FEC PCI Mezzanine cards are housed in a PC Many module production centers are now equipped with it N. Marinelli Imperial College-London

  13. In the Labs Set-up including optical link digital for control analogue for read-out Temporary ‘Optical’ interface card equipped with laser driver and optical fibre N. Marinelli Imperial College-London

  14. On the Beam Beam Test set-up (still going on) First large scale use of optical link for read-out 6 TOB modules fully equipped with next-to-final O-components 1 control ring Qualification of modules and links N. Marinelli Imperial College-London

  15. About synchronization Relative Development of strategies and related software for timing alignment The APV regularly outputs synch pulse which can be used to measure and correct delays along a control ring and from FED to FED The relative synchronization can be then done automatically ns Plots are done with digitized data The synch pulse is reconstructed by sweeping the delays N. Marinelli Imperial College-London

  16. S/N ns Some results/examples Delay scan for absolute synchronization Aim: sample the signal right at the peak (i.e. adjust the sampling w.r.t the beam) Example:APV in peak mode The signal is reconstructed in function of time, by sweeping the delays. S/N (highest S/N cluster found) is plotted here The position of the peak gives the value of the delay adjustment to be made N. Marinelli Imperial College-London

  17. Some results/examples Pedestals Mod 1 Mod 2 Mod 3 Mod 5 Mod 4 Mod 6 With analog O-link read-out, with gain and bias not yet optimized N. Marinelli Imperial College-London

  18. No substantial difference observed between electrical and optical readout • lower Common Mode • better subtraction Some results Beam profile and Landau’s distributions S/N ~ 30 peak ~ 18 deconvolution N. Marinelli Imperial College-London

  19. Tracker Inner Barrel Tests on single modules going on: Integrated digital and analog O-links Power supplies with long cables Results on the way …. Plans until the end of the year: mechanical and electrical integration of 1 string from Layer 1 (6 double sided modules) 1 string from Layer 3 (12 single sided modules) N. Marinelli Imperial College-London

  20. Tracker Outer Barrel • Done: • Electrical test on IC Bus/Cards • Signal integrity • Impedance match • Voltage drops • I2C communications • Few details fix • Integrate the modules, • CCU module,O-hybrids, HV • Cooling • Grounding close to final • Temp/humidity measurements • First tests with -source* One Single Sided rod operating A Double Sided one on the way * All modules in the rod had previously operated either singularly in lab set-up or in a ring on a beam N. Marinelli Imperial College-London

  21. Tracker Outer Barrel !!!! Preliminary !!!! results with -source data Near future: • Study sensitivity to noise on the power lines / grounding • Go to the tracker operating temperature • Install 12 detectors in the second rod (DS rod) • Add a second rod N. Marinelli Imperial College-London

  22. R#7 R#6 R#5 R#4 R#3 R#2 R#1 Tracker End Caps 9 wheels per EndCap 8 front + 8 back petals per wheel N. Marinelli Imperial College-London

  23. Tracker End Caps • Design verification of petals • mechanics, done • electrical performance of the interconnect board, done • deformation after cooling down tested • System test in 4 steps: • Test of the 2nd detector group (rings #3, #4, #6) • Test of the 3rd detector group (rings #5, #7) • Fully equipped but without Si-Sensors, • Test of the 1st detector group (rings #1, #2) • Fully equipped but without Si-Sensors, • Results expected by the end of this year • Full System Test for Front and Back petal • fully equipped with Sensors and front end electronics • with final cables and power supplies • Final results expected in spring 2003 N. Marinelli Imperial College-London

  24. Conclusions Big progress and achievements in the last six months System tests for all the sub-detector parts on their way in parallel with continuos development at CERN Satisfactory results up to know More to come in the next following months Special care to be mainly put, at this stage, into powering, grounding and shielding ... A long way to go yet ….. N. Marinelli Imperial College-London

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