NA61 revised beam request and other issues CERN October 26, 2010 Status of the 2010 runs Revised beam request Other issues

Status of the 2010 runs Physics run completed on October 26 (yesterday) rate ~ 0.85M/day cumulative duty factor ~ 85% p+p @ 158 GeV/c [47M] 83Kr calibration [14M] p+p @ 13 GeV/c pilot p+(T2K RT) @ 31 GeV/c [10M] comissioning

Test of secondary ion beams at 13A, 20A and 80A GeV will take place from November 22 to December 5, 2010 Preparations involving BE, EN and NA61 are progressing well

Revised beam request (preliminary as the ion test still not performed) Stop of SPS beam in 2012 and considered reduction of duty cycle will have a negative impact on NA61. To minimize this, NA61 proposes the following measures: Convert the second test of 11B beam in 2011 to physics run with 11B+C at 13, 20, 30, 40, 80 and 158 GeV/c. (60 days of Pb.) (Discussed with Stephan Maury, CERN-BE.) Establish primary ion beam preparation schedule, which would allow 48 days Ar primary beam for physics in 2013 and 48 days Xe primary beam in 2014. High pT p+p at 158 GeV/c in 2011 should be completed (30 days of p). p+Pb at 158 GeV/c for high pT may have to be shifted to 2013.

Impact on CP&OoD physics: NA61 proposal (assuming 25% duty cycle etc.): 2M central events for multiplicity, pT fluctuations; inclusive hadron yields & spectra; multi- strange hadron yields. 4M minimum-bias events for elliptic flow; centrality dependence of multiplicity fluctuations. September 2010 SPSC (assuming 5% duty cycle etc.): 1M central for multiplicity, pT fluctuations; inclusive light hadron yields & spectra. Basic CP&OoD measurements can be still performed. Negative impact: no measurements of elliptic flow, no centrality dependence of multiplicity fluctuations; limited measurements of heavy (e.g. multistrange) hadrons.

From the SPSC draft minutes The SPSC strongly encourages all efforts to work towards physics running with a secondary Boron beam in 2011. In particular, the feasibility of a secondary B beam of sufficient purity should be established at the earliest time possible, and the available Pb beam in 2010 should be used accordingly. -> prolongation (from one to two weeks) of the test of secondary ion beams

Progress and plans in data taking for CP&OD (central events only) Pb+Pb NA49 (1996-2002) Au+Au STAR (2008-10) NA61 ion program Xe+La 2014 Ar+Ca 2013 B+C T T T 2010/11 p+p P p+p 158 2009/10/11 p+Pb 2013/14 13 20 30 40 80 158 T -test of secondary ion beams energy (A GeV) P -pilot data taken

? NA61 plans: Onset of Deconfinement Search for the onset of the horn in collisions of light nuclei ? Expectation for energy and system size scan: similar structures (kink, horn, step); vanishing for small systems In particular the ''horn'' like structure is expected to be similar for Ar+Ca and Pb+Pb collisions and then rapidly disappear for smaller systems

NA61 plans: Search for the Critical Point Search for the hill of fluctuations CP signal w, pT, ... T 13 B Increase of critical point signal (multiplicity and average pT fluctuations, etc.) for system freezing-out near the critical point Non-monotonic dependence of critical point signal on control parameters (energy, centrality, ion size) can help to locate the critical point

Landscape of heavy ion experimental programs

NICA LHC SPS SIS RHIC Landscape of heavy ion experimental programs the onset of deconfinement

Other issues Status of issues from the last meeting (27.05.2010) New issues

Status of issues from the last meeting (27.05.2010) Continues presence at CERN of NA61 physicists need for detector upgrades/maintenance and run organization/execution NA61 hopes for: -prolongation of Zoltan's position at CERN by five months (until the end of the 2010 run) Done -CERN help in finding permanent solution No progress -approval of application of Wojtek Dominik (leader of the Gas Detector Group at the Warsaw University) for a CERN (Corresponding) Associateship starting in 2011 Application submitted, waiting for results

Status of issues from the last meeting (27.05.2010) -NA61 software/data preservation project has been discussed at the last (November 2009) meeting with the CERN Directorate: -a support at the level of 50% CERN Fellowship for a period of two years was promised, provided the project is approved within the PH -proposal for the NA61 software virtualization at CERN was discussed and approved at the meeting on March 4, 2010 (P. Bloch, L. Matelli, P. Buncic (PH-SFT), P. Mato (PH-SFT)) Michajlo Mudrynic, Project Associate (PH-SFT) stared to work on the NA61 software/data preservation from October 1, 2010

Project Timeline 2010 2011 (Predrag Buncic, October, 2010) M1 CernVM 2.2.0 31/10/2010 T1 NA61 release certification in CernVM 2.2.0 30/11/2010 T2 Testing components, designing system T3 Installing Cluster 15/12/2010 M2 Cluster installed T4 Developing and testing job submition, Ganga interface, monitoring 31/01/2011 T5 Developing and testing xrootd, xcfs 28/02/2011 T6 Testing complete system 15/03/2011 M3 First usable version 30/03//2011 2010 2011 O N D J F M A M J J A S M1 CernVM 2.2.0 T1 T2 T3 M2 T4 T5 T6 M3

Status of issues from the last meeting (27.05.2010) -NA61 data taking requires continuous presence at CERN of about 15 people (6 shifters, 9 experts) -this requires travel funds of about 15x4k CHF = 60k CHF per month, and for the four month-long data taking period about 240k CHF -travel funds requested by the Polish groups were significantly reduced (by about 100k CHF per year, total allocated grant about 1M CHF for 3 years) NA61 requests: -financial contribution of 100k CHF to cover travel costs related to the 2010 run 50k CHF for 2010 was allocated, waiting for a transfer

New issues The NA61 liquid hydrogen target have been maintained and operated up to now by Ch. Berthelier from TE-CRG The group is reorganized and says it cannot continue support A new solution for the LHT support is needed

New issues NA61 software which is based on the NA49 one (mid 90s) requires major upgrade The proposal for the upgrade was recently formulated (Andras+KIT group), discussed with the PH-SFT and approved by NA61 The new software will be based on C++, used STL based C++ containers and ROOT based input/output. Gradual upgrade of the existing software is planned. The upgrade requires a core group (2 seniors, 3 students) working at CERN (Andras, PH-SFT). CERN support to this project is highly desired: 2 technical students (12 months each), 1 project associate (12 months)

New issues Proposal for the organization of 8th Workshop on Critical Point and Onset of Deconfinement at CERN in Summer/Autumn 2012 Series initiated by E. Shuryak, P. Seyboth and MG in 2004 Past workshops: Trento (2004), Bergen (2005), Florence (2006), Darmstadt (2007), Brookhaven (2009), Dubna (2010) 2011 workshop: Wuhan, China Typical number of participants: 150 CERN support on infrastructure/organization would be required in 2012

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