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The LUCID detector

The LUCID detector

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The LUCID detector

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  1. The LUCID detector LUCID is located inside the support cone of the VJ beam pipe The only access is through small holes 16+16 tubes with PMT 4+4 tubes with fibers

  2. LUCID Performances in 2010 (1) • The agreement between data and Monte Carlo was much better than what was expected from the 450 GeV run. • The background was low. • The calibration was limited by the uncertainty in the beam current measurements and not by detector effects. • LUCID was the only detector that provided a precise and stable luminosity measurement during all of 2010. Conclusion: the LUCID running in 2010 was a great success !

  3. LUCID Performances in 2010 (2) • Most analysis in ATLAS are using LUCID luminosity data (3.4 % error) either for  measurements or for normalization of Monte Carlo simulations

  4. INFN Bologna contribution • LUCID has proven to be a stable and well performing luminosity monitor for ATLAS • It has been designed built and commissioned using almost completely INFN Bologna section resources • Detector mechanics project and realization • Full electronics system (PMT and fiber readout): development of Fibers readout front end,PMT front end, backend, CFD, led calibration, pulser calibration, lumat card Nowadays, the particle physics experiment are technologically very advanced and CAN NOT be build without a proper technical support. The Bologna INFN section provides since many years an impeccable services to its researchers activities. Some examples of this are given in this and the following slides. PMT Electronics Fibers Fibers HV distribution box

  5. Lucid Mechanics Design developed by Bologna (G. Laurenti e S. Michinelli) • Workshop Resp.: M . Guerzoni

  6. LUCID Electronics Card Pulser +LED Calibration System As installed in ATLAS Pulser Calibration System • Fully designed and developed in Bologna (G. Avoni) • Electronics Lab resp: I. D’Antone OLD and NEW Analog signals receiving cards

  7. LED CALIBRATION DATA 1 photo electron (pe) peak SINGLE PHOTOELECTRON SIGNAL AFTER ~100 m CABLE LUCID READOUT CAN FOLLOW THE BUNCH! ~ 15 ns ~ 15 mV , Typical 1 track signal ~ 100 pe

  8. The CFD card • Transforms analog signals in hits and provides integrated on-line luminosity • Fully designed and developed in Bologna (S. Meneghini)

  9. Alternative scheme for LUCID Readout PLACED ON THE TOP OF TX1S • 4 tubes in each detector are read-out by quartz fibers • The data recorded with this system should be able to tell us if the fiber readout • is a viable option for possible future developments • Fully designed and developed in Bologna (C. Baldanza) LUMAT CARD

  10. Accessory Electronics Modules • Designed and developed by Bologna (G. Avoni) TTL to diff ECL/LVDS translator Digital Delay Line

  11. Lumat CARD • The LUMAT CARD is providing the ATLAS ON-LINE Luminosity (By BUNCH and INTEGRATED) • Designed and developed in Bologna (M. Villa, G. Avoni, G.Pellegrini) Mezzanine Card (re-using the CMS barrel sorter mezzanine)