Philippe Charpentier's home page

	Welcome to Philippe Charpentier's Home page

You'll find below a brief cursus of my activities in HEP since I started working in this field in 1973. When I have time, I'll add more links and pages about my travels with pictures...

NA3

The beginnings

In 1975 I had completed my studies at Ecole Polytechnique (X) in Paris when I started working in DPhPE (now DAPNIA) in Saclay on the NA3/Lezard experiment. Before that, I had been working for 2 years intermittently on the PS Hyperon experiment, with the X laboratory where I met my Masters in physics : Jacques Lefrançois and Jean Badier. It is with them that I had then the chance to live the very exciting experience of NA3. I also had the chance to meet very interesting friends during these years, the list is too long to be mentionned here, but certainly our spokesman Aldo Michelini (later founder of OPAL) was an outstanding physicist and the most human person one can imagine. Of course I don't forget Olivier Callot who was another student in this experiment, coming as well from the hyperons.

We started studying hadronic production of muon pairs with a beam dump setup and many important results were produced:

Structure function of several hadrons (p,pbar, pi, K)
Production of Upsilon from pion beams
Discovery of the "K" factor (QCD corrections to the Born cross-section of Drell-Yan processes). Its name was chosen as "K" at one of our meetings without us noticing this was the initial of one of the founders of the experiment W.Kienzle and for a while it was the "Kienzle-factor"!
Hadronic Production of J/Psi (this was the subject of my Doctorate Thesis I obtained in 1983). Analysing the A dependence of the cross-section, a peculiar dependence with the rapidity was observed, interpreted as a diffractive production mechanism.

We then moved to single photon hadronic production, for which we were pionneering the field, quickly followed by more performant detectors. We completed the experimental program of NA3 in 1984 with a search for light gluinos, using a beam dump hadronic experiment in which the dump was followed by a vacuum decay tank in order to observe the decay of WIMPs. But unfortunately only a large number of strange particles (close to a million K0s, a even a few Omega-) were observed, allowing a tuning of hadronic shower MC programs.

DELPHI...

Brief cursus

I started working in DELPHI in 1984. I proposed in 1985 with my Saclay colleagues the concept of Crate Processors. Originally foreseen for the TPC, the FIP processors I contributed to define have been used as the unique DELPHI Fastbus processor.

Together with C.Story of Oxford, I designed the Fastbus readout system in 1986/87, using SASD techniques. I participated as well in the definition of many parts of the online system (trigger decision and control units, slow control strategy, online software, ...).

In 1988 I implemented the CP software and supervised the DAS commissioning in 1989. I took over the LES software responsibility from R.Lucock in 1990 and part of the VAX-VMS software after Michel Jonker's departure in 1992.

Since 1992 I have been Project Leader for DAS software. I have been member of the DELPHI executive committee (DEC) from May 1996 to May 1998. I was since the beginning of 1997 Project Leader for the both DAS hardware and software. Since 1998, I am a member of the DELPHI coordination. Since January 1999, I am Group Leader of the EP/DEL group and responsible of the DELPHI CERN Team.

In Spring 2000, I launched with my TPC colleagues a task force for understanding the origin of the TPC distortions. The new method for computing these distortions has been implemented by E.Piotto. As from the end of LEP data taking, I defined a procedure for measuring the TPC drift velocity as a function of time with a relative precision of the order of 10^-4. Details on this procedure and results can be found here.

DELPHI Web pages

Here are a few pages I am responsible for in DELPHI :

DELPHI Online
TPC drift velocity

LHCb

Since May 2001, I am also member of the LHCb collaboration.

I have been following the progress of the Data Acquisition (DAQ) and Experiment Control System (ECS) design and gave advice for the writing of the Online TDR.

As from autumn 2001, I have the responsibility of Physics Software Coordinator in LHCb. It consists in linking software activities (mainly offline) with physics (analysis, high level triggers, simulation etc...). I participate in most offline computing meetings, dealing with the main software projects related with physics: simulation (Gauss), reconstruction (Brunel), physics analysis (DaVinci) and the LHCb framework Gaudi . In 2002, these packages will make their transition from fortran based algorithms to C++, and the computing group is setting up the LHCb Event Model . One of the tasks is to make sure that the actual implementation by subdetector groups of this event model is suitable, and that the guidelines are also suitable for being used by the subdetctor groups. Based on this generic event model, an LHCb Physics Event Model is being developped to be used in DaVinci. Tools are being developped by the LHCb Rio group.

I am the LHCb representative in the Project Execution Board (PEB) of the LHC Computing Project (LCG) which meets weekly.

LHCb software related pages

Most software activities in LHCb can be looked at from the Computing page.

Administration

Division

EP/DEE (DELPHI) Group Leader

Address

EP Division, CERN, CH-1211 Geneva 23

E-Mail

Philippe.Charpentier@cern.ch

Office

13-1-035

Telephone

Office : +41 22 76 74244
GSM : +41 79 201 0167 / 16-0167 from inside CERN
FAX : +41 22 76 79100

Link to Database of CERN

[CERN] [CERN for public] [Delphi] [Delphi Online] [LHCb]

Last modified 7June 2001 - Ph.Charpentier