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Saclay at D0 (run I) : the origins

Saclay at D0 (run I) : the origins. 1983 : Armand Zylberstejn is already in the US, on the K 0 experiment with Jim Cronin Yves Ducros works on Cello in Desy Armand meets Paul Grannis, Yves meets Bernie Pope.

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Saclay at D0 (run I) : the origins

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  1. Saclay at D0 (run I) : the origins • 1983 : Armand Zylberstejn is already in the US, on the K0 experiment with Jim Cronin Yves Ducros works on Cello in Desy Armand meets Paul Grannis, Yves meets Bernie Pope. • 1984 : Decide participation of Saclay to D0, to make the Transition Radiation Detector • Meeting at MSU Bruno Mansoulié, CEA/IRFU-SPP D0 Meeting Oct 13th '08

  2. D0 Saclay The infancy • Review Committee : Armand convinces his audience by showing the telex « Accepted by CEA » from Saclay director M Banner… And it is real! • We (AZ, YD, BM, J Teiger…) start to discover all about TRD. • Rather fascinating:: multi-foil interference, imperfect radiators, • Prototypes at Cern: test different radiators (Li, polypropylene foils and fibers) The analysis of these tests will be the first Thesis in D0 : Fabrice Feinstein • Design of the 3 layer TRD for D0, beginning of construction 1986 Bruno Mansoulié, CEA/IRFU-SPP D0 Meeting Oct 13th '08

  3. Growing up is not always easy • Seen from Saclay, the beginning of D0 was not always easy and peaceful…. • Delays for the first run : sometime in ‘87 or ’88, AZ and YD send a telex to D0 , « Saclay : ‘89 or bust! » • …the first run took place in ’92…and we did not bust, wisely! • But from time to time, we would hear a rumor that « D0 will never fly » !!! Then at the next collaboration meeting we found the collaboration working like ~usual… rather strange… • But we keep constructing the detector Bruno Mansoulié, CEA/IRFU-SPP D0 Meeting Oct 13th '08

  4. Ксенон Grown-up TRD • The detector is finished… • We test it thoroughly on a beam at Cern • For this we need Xenon… We quickly discover that a USSR group sells black-market Xenon. We hide the bottles with Xenon in Cyrillic characters. Bruno Mansoulié, CEA/IRFU-SPP D0 Meeting Oct 13th '08

  5. Data, anyone? • The TRD is shipped to Fnal in ’88. It will remain as delivered for almost a year… then it gets inserted • During this time, we get into the D0 software. At that era, the fashion is SASD. As others, we do our best to make bubbles… • But Armand cannot keep quiet and refrain from acting… quickly he gets sanctionned: forbidden from touching the D0 library… (but even now he claims « I did not do it ») Bruno Mansoulié, CEA/IRFU-SPP D0 Meeting Oct 13th '08

  6. Data, at last • First run 1992 !! • We struggle with electronics , coherent noise, oscillations… • True enough, we now know that M(top) > M(W) , which makes the TRD less central to the top analysis. Where it is needed (low pt electrons), b-jets are narrow, and the TRD gets easily crowded… • But we do our best to bring a safe e-ID for the top analysis… Bruno Mansoulié, CEA/IRFU-SPP D0 Meeting Oct 13th '08

  7. The rest is History… • The top is discovered in 1995 • Saclay is very proud of having been part of it (the only French group …) • J Alitti, L Chevalier, Y Ducros, J-F Detoeuf, F Feinstein, J-F Glicenstein, D. Hubbard, J-F Lebrat, P Mangeot, BM, A Pluquet, J Teiger, A Zylberstejn • Thank you so much to our friends and their hospitality! Among (many) others: • Paul Grannis, Gene Fisk, Bob Lanou…. For D0 • Horst Wahl, Vasken Hagopian, Henryk Piekarz for the TRD team… • And many cheers to D0 run II… Bruno Mansoulié, CEA/IRFU-SPP D0 Meeting Oct 13th '08

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