Mario Sannino Stampa

Informazioni generali e contatti

Dipartimento: DIFI

Orario di ricevimento: Su appuntamento, per email

Telefono: (+39) 010353 - 6212




I got my degree in Physics (Old Italian “Laurea in Fisica”) in 1975 discussing a thesis about tracking
in muon detectors of the R 804 Experiment at CERN ISR after a period of stay at CERN between april
1974 – august 1975 in order to prepare it under the supervision of Prof. G. Diambrini Palazzi.
Since mid 1976 until 1984 I participated to the CERN experiments WA 34, WA 45, WA 58 (Identified
by the acronym GEMCHA) at the Omega / Omega Prime Spectrometer. In these experiments an
emulsion was used as a target coupled to the spectrometer so to detect charm hadrons photoproduced
in emulsion and to measure their lifetimes in the emulsion itself. The tracking information in the
spectrometer was used to match the tracks from the interaction vertices reconstructed in the
spectrometer with the ones from the vertices found in emulsions allowing so a complete kinematical
reconstruction of the event. In this period my activity was essentially at first on the track reconstruction
and on the analisys software and then on the events finding and matching in the emulsions developing
proper matching and system alignment methods.
Since 1980 I participated to the experiment WA 71, also at Omega Prime Spectrometer, dedicated to
the Beauty decay search. In addition to the emulsion, acting as a sensitive target in a hadron beam,
there was a special silicon detectors telescope looking at jump of multiplicities among tracks followed
by a small Time Projection Chamber, the information of which was added to the one of Omega Prime
MWPC’s so to improve tracking near the interaction point. The purpose of the silicon telescope was
to trigger on the decays of Charmed particles helping so the search of Beauty Decays in the emulsion
by taking advantage of their dominant decays in Charmed Particles. The definitive data taking at the
Omega Prime was in 1984 after test data takings both at the Omega Prime and at test beams in 1980,
1981, 1982 and 1983. My activities on this experiment went from simulations of the detectors to the
construction and tests of the TPC and to the DAQ of the tests and the on-line monitoring. Lastly, I
took care of the whole DAQ of the experiment and of all the operations and calibrations concerning
the EM Calorimeter that was installed on the Omega Prime Spectrometer.
Since 1981 I started my collaboration with the Delphi Experiment to which I gave a full time
participation since autumn 1984 until end 2000. My activities in Delphi were inside the INFN Genova
group, essentially on hardware, and were dedicated to four different topics:
a) study of feasibility of particle identification with a simple TOF system implemented by means of
scintillation counters (1981 to 1983).
b) design, construction, testing, monitoring and controlling of the EM calorimeter implemented with
the technique of HPC - High Density Projection Chamber (1984 to 1990). About the design my main
original contribution was in the attenuation length measurement of a charge drifting in a narrow
channel under an electric and magnetic fields parallel between them. The narrow drift channel was a
perfect replica of the one designed for the definitive HPC prototype. The measurement was performed
with the drift channel inside a solenoid at the LAL – Orsay. A system of the same type, with an
analogous drift channel, was then used in the to monitor the gas feeded to the HPC in the experiment.
Besides participating the design and the construction activities of the detector I was involved in the
Monitoring and Slow Controls System of the HPC. With the aid of a drift channel of the type above
mentioned I devised an original method of alignment of the real HPC modules in the Delphi Magnetic
field using alpha sources. The same system could also be used for a monitoring of the drift system
charge transmission system in each HPC module. I also designed a part of the slow control system of
the HPC i.e. HV for Detecting Chambers, Drift Field VHV and Temperature monitoring.
c) redesign of the Forward Rich Detector and of the R/O preamplifiers (1991 to 1993). The Delphi
Forward Rich detector was staged and, at the installation time, an issue due to the excessive dead time
of the preamplifiers when a M.I.P. crossed the chamber, was present. The effect of this was to blind
the detection of eventual photons just not too far from the M.I.P. My original contribution was the
proposal to use a preamplifier with a logarithmic transfer characteristic directly participating to its
design and implementation on an hybrid circuit. This new preamplifier was successfully installed in
the experiment and a dead time was reduced of a factor 4 reducing in a drastic way the above
mentioned effect with a good amelioration of the chamber detection efficiency.
d) redesign of the main trigger supervisor control box named ZEUS (1994 to 1997). The main trigger
supervisor control box, a custom made Fastbus module installed since the beginning of the experiment,
was obsolete for the LEP 200 running so it was decided to implement a new one. Our group was
assigned this activity which was set under my own responsibility. We redesigned completely the
module using state machines and in particular, besides doing all the testing and the debugging activity,
I redesigned from scratch the Fastbus Coupler allowing for the Block Transfer Fastbus procedure
which was not implemented in the previous ZEUS module. In 1997 the module was finally installed
and ran without any problem until the end of Delphi Operations in 2000.
In 1997 I became responsible of the DAQ system of the Delphi Rich Detectors and I performed all the
regular checks in order to keep the system updated and working. I kept this role until the end of the
experiment in autumn 2000.
In september 1997 our group entered formally into LHCb Collaboration. Our participation was then
approved by INFN so our official participation started at the beginning of 1999. Since the beginning
of the participation until the end of 2006 I was the responsible of the Genoa Group.
Since the beginning of 1999, in the context of the Genoa group, I have been working both on the
RICH detectors and on the Online System for the LHCb experiment. My key contributions in the
RICH Detectors have been in the mechanics for the photon detectors and, lately, in equipping and
testing these with the on-detector electronics in addition to work on the HV system.
In the Online Group I gave also a key contribution to the design and production of the Glue-Card used
by the whole of the LHCb Experiment. The above mentioned RICH HV System exploits just the Glue
Card for its interface to the experiment DCS System.
Since 2007 up to present time I am working on the offline calibration software for the RICH2 Detector
in LHCb implementing some new methods of data analysis with C++ Software.
The LHCb Experiment found important results, all published, about CP Asymmetry in the Heavy
Quarks sector.
In the year 2012 my participation to the LHCb experiment came to an end and, for the new data taking
phase, after the LHC first upgrade, I moved to the ATLAS Experiment , always at CERN LHC, well
known in the World for its Higgs Boson discovery.
At present I am participating to the upgrade of the ATLAS Tracking Detectors.
More in detail until the end of 2014 I participated to the implementation, together with the Genoa
Group, of the new internal tracker called IBL (Insertable B-Layer) in charge of ameliorating the
reconstruction of secondary vertices due to short lived particles decays and recently installed at CERN.
Inside this activity I implemented the software needed for the IBL production database.
My present activity is now essentially addressed to the R&D needed for the construction of a new
Detector for Interaction Vertex Reconstruction, named ITK and in itself an evolution of IBL, in the
ATLAS detector.
I held, during all the above years of activity, the following positions:
1976 to end 1977 : Student of Scuola di Perfezionamento in Fisica (PhD did not still exist in Italy in
those years).
1978 to 1980: INFN fellowship (Borsista INFN).
1980 to 1992: University Research Worker (Ricercatore Universitario) at the University of
Genoa– permanent position with some teaching duties.
1992 to present: Associate Professor (Professore Associato), before at the University of Salerno
(Academic year 1992/1993) and then, since 1993, at the University of Genoa –
permanent position with teaching and academic duties.