ALICE CERN Team Group Leaders meeting

82 Pages·2013·11.71 MB·English

34th ALICE RRB
pPb @ 5 TeV
P. Giubellino April 17, 20112
Six months in a flash
• The harvest of physics results continues
• Over 400 presentations at international conferences in the
last 12 months
• 60 papers published or submitted, many more in preparation
• Very high impact (8 ALICE physics papers have over 100 citations, one
over 250, “famous”)
• An important pp run completed successfully
• 8 TeV running to :
• Increase Minimum Bias statistics
• Collect an essential sample of comparison data with rare triggers
• An excellent pA run
• after the short pilot run in September the Jan/Feb run has
allowed to collect the full planned statistics
• Already three publications, and an unexpected result which is
stirring a lot of interest!
• Implementing the strategies for the future
• Upgrade plans progress: a future of more exciting physics ahead! 2
Collaboration News

• New institutes
– NISER (India) New full member Physics
– Inha University (Korea) New full member Physics, ITS upgrade

– Konkuk University (Korea) joins ALICE in association with
Gangneung University Physics, Muon Spectr.
• Ongoing discussions
– Discussion advancing with several Institutions specifically
interested in participating in the Upgrades (China, Brazil, Chile,
Pakistan, Indonesia and Austria), increasing with time!

ALICE continues to be very attractive! Favorable moment for
involvement of new institutes, focusing on the upgrades.
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ALICE participating Institutes (1992-2012)
Number of participating institutes in ALICE
Total Full Members Associate Members
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012
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Organization
• Nominations:
– Run Coordinator: F. Ronchetti
– Electronics Coordinator: A. Kluge
– Trigger coordinator K. Oyama (extended until end 2013)
– PWG Coordinators
• New PWG HF Co-Coordinators: Ralf Averbeck and Francesco Prino
• New PWG PP Co-Coordinator: Cvetan Cheshkov
• New PWG GA Co-Coordinator: Yuri Kharlov
• New PWG LF Co-Coordinator: Lee Barnby
– CC Members:
• Panos Christakoglou and Helen Caines renewed for a second two-year mandate
• New Member: Sudhir Raniwala
– EB Members :
• New Members: Tom Humanic, Guy Paic and Gianluca Usai
– CB: 3 elected Junior Members (5 yrs or less after PhD)
• Chiara Bianchin, Jan Fiete Grosse-Oetringhaus and Jochen Klein
• Service tasks
– The CB voted that every graduate student registered in ALICE since Jan 1st
2012 must fulfill the obligation of 6 months equivalent of service tasks, i.e.
tasks of general interest not directly related to the thesis work. (past work
will be credited)

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Goals of the ALICE 2012/13 run
System √s (TeV) Days of running Integrated luminosity
pp 8 145 2-5 pb-1
pPb 5.02 24 > 30 nb-1
• pp: integrate luminosity for comparison with the high-lumi 2011 Pb run,
together with already taken data in 2011 pp run
– main-sat. collisions (luminosity goal 5 µb-1s-1)
– collect 109 events minimum bias
– 2 pb-1 for rare triggers in central barrel (hard processes scale as N ~ A2 )
coll
• EMCAL (jet, , electron), PHOS (), diffractive, high multiplicity, TRD (jet, electron)
– 10 pb-1 for forward muon arm(, ’, ’’, W)
• p-Pb: for separation of initial and final state effects on PbPb measurements ( parton
saturation, shadowing, …)
• Heavy flavor production, Quarkonia, Jet rates, Direct photons,,…
– expected peak luminosity ~ 1x1029 (cm-2s-1) = 100 (mb-1s-1)  min. bias rate: 200 kHz
– 108 minimum bias events and an integrated luminosity for rare triggers >~ 30 nb-1
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Background
At the beginning of the 2012 pp data taking period ALICE was heavily
affected by background from high vacuum pressure in the Long Straight
Sections and in particular from the TDI.

Due to the ’particle load’ on the detector we could turn on and start data taking
with all the detectors only 5-6 hours after declaration of stable beam.

A new injection procedure was applied very quickly  significantly better
vacuum pressure

First Last
Thanks a lot!!!
… looking forward to planned improvements
on long straight section during LS1!
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Enhanced satellites
• In the 2012 pp run, issue of insufficient luminosity by natural satellites
(typical avg. luminosity ~ 1 µb-1s-1 which is a factor five too low)
• After TS3, machine started to try “enhanced satellite” mode
• We could run at above 5-7 µb-1s-1 average most of the time in the last
two months of the pp data taking period => a substantial fraction of
the integrated luminosity goals have been reached
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The pPb run
(after the appetizer in 2012)
• Goals:
 108 minimum bias events
30nb-1 integrated luminosity
p-Pb – Pb-p switchover
magnet polarity change for p-Pb and Pb-p

• All achieved except for polarity change during Pb-p (+4 days of pp
at 2.76 TeV)
Impressive performance of HI injectors and LHC !!
Congratulations !!
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First Collisions
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