Finnish ALICE collaboration Finnish ALICE collaboration

Jan Rak, DongJo Kim, Sami Rasanen, Norbert Novitzky, Jiri Kral

1SAB meeting Helsinki

FIN-ALICE activities in 2009FIN-ALICE activities in 20091. Preparation for the first data analysis.

– Jyvaskyla team is leading the paper preparation group within physics working group PWG4 : two particle correlation, analysis of the high-pT particle and direct photon associated yield.

2. Tier 1/Tier 2 computing.

3. ALICE EMCAL:– Participation in the commissioning of the ALICE/EMCAL

– Development/production/firmware development of the internal logic for the Trigger Region Units (TRU) for the single photon triggering in EMCAL

4. T0 maintenance and operation– T0 team shrank we have to find and train new personnel

5. Central Trigger Processor activities– Online monitoring

– Trigger alignment and triggering scheme development (our plots shown in plenary QM09)

6. ALICE Run Coordination 2009-2010

7. Teaching/trainings– 4th High-pT workshop in Prague http://cquark.fjfi.cvut.cz/~hpt09/index.html

– Jyvaskyla Sumer school http://www.jyu.fi/science/muut_yksikot/summerschool/en/

– Participating in preparation 2010 CERN summer school with Paula Eerola

– Experimental Ultra-relativistic Heavy Ion Physics

– Summer trainee (CERN and JYFL)

SAB meeting Helsinki 2For more details see appendix. I have no time to talk about that here.For more details see appendix. I have no time to talk about that here.

SAB meeting Helsinki 3

2009

2010

LMC meeting May 13th 2009

Concerning the general schedule for 2010, all experiments agreed to the proposed schedule (+1 H.I week) and the 3 day stop every month

APPENDIXAPPENDIX

SAB meeting Helsinki 4

T0T0

SAB meeting Helsinki 5

T0• Detector modules

– Check performance of PMT5 on T0-A• Afterpulses; measurements with magnetic field

• Fast electronics– Installation of shoeboxes T0-A and T0-C– Pre-trigger tests with TRD team– Re-cabling of T0-A– Tests of new/spare modules– Solving RF pickup by ELMB– Reinstallation and tests of ELMB– Cabling optimization in VME crate– Add locking of L0 for laser calibration during the global

run– Fine-tuning of HV, thresholds, delays, etc.

• Readout electronics– New firmware for DRM and TRM configuration

• DCS– New version with VME Scalers included– Configuration of readout electronics– Online luminosity monitoring– Test of archive DB– Test of configuration DB– Integration with ALICE DCS

• Trigger– Tests of callibration trigger in global run– Full test of T0 as a trigger detector

• Online & Offline– Test AMORE– Test QA and DA

SAB meeting Helsinki 777

Pulse shape characteristics of a micro-Pulse shape characteristics of a micro-mesh PMTmesh PMT

Main peakMain peak Afterpulses – TB December 2008Afterpulses – TB December 2008 ““Ringing”Ringing”

Additional structures in PMT amplitude spectrum (afterpulses, Additional structures in PMT amplitude spectrum (afterpulses, ringing, reflections) cause problems for TRD wakeup .ringing, reflections) cause problems for TRD wakeup .

Attempt was made in 2007 to address the problem by redesigning Attempt was made in 2007 to address the problem by redesigning the preamp (reflections fully eliminated, slightly better the preamp (reflections fully eliminated, slightly better performance). performance).

However, there is no significant difference between the old and the However, there is no significant difference between the old and the new design as new design as neither handles afterpulses or ringingneither handles afterpulses or ringing Both should work OK in pp Both should work OK in pp Both will give additional pulses at higher amplitudes (PbPb)Both will give additional pulses at higher amplitudes (PbPb)

EMCAL TRUEMCAL TRU

SAB meeting Helsinki 8

ALICE EMCal TriggerALICE EMCal Trigger• Trigger Region Unit (TRU) is

responsible for L0 generation

• JYU took over the leading role inTRU firmware developmentduring first months of this year.

• The whole L0 trigger algorithm was developed,crucial mistakes in already existing supportcode have been found and fixed since then.

• Remote re-programming ability was added,to allow updates after cavern closure.

• EMCal TRU was meant to copy firmwarefrom PHOS TRU. The situation turnedinto PHOS copying the EMCal solution.

• The TRU project is back in scheduled track.

TRU

Trigger Region Unit developmentTrigger Region Unit development• Final HW design reached

• Production of first 12boards under way(Norbert)

• Remote FPGA

PROM programming option was introduced. (Jiri) PHOS copied the solution.

• Trigger algorithms were implemented and passed first tests. (Jiri)

• Faults in already closed code discovered and fixed / are being fixed. (Jiri)

Remote programming optionRemote programming option• Remote re-programming of the FPGA and EPROM via JTAG is

crucial, since without it, there would be no update possible after closing the cavern.

• Reprogramming of both trigger and DCS embedded devices now possible.

• A programming file simulating real HW setup is prepared by developer and placed on a server. Embedded DCS board pulls the file and runs program, that plays the file (text to TTL) + kernel and FPGA JTAG implementation. On-board drivers convert to differential for long range transportation. Specific differential to TTL adapters pass the signal to TRU.

TRU TRUDCSDCS

Trigger Region Unit firmwareTrigger Region Unit firmware• Trigger algorithm implemented, board controller almost done

• Two important parts of firmware, which were believed to be finished and tested, had to be rewritten due to errors / incompatibilities. This introduced additional and unexpected work load, which was successfully resolved.

• Errors found by Jiri in deserializer. Completely rewritten.– Wrong bitslip programming approach. Data window was shifting +- one bit due to

chosen constant shift solution. Self adjusting algorithm developed and automated sync and deskew patter lock-on implemented.

– Not ideal delay constants (dozens of ps) were chosen, making data lines instable with error rate ~ 1.4x10-8 % (20/hour). Thorough tunning performed.

– PCB design fault discovered, reflections/power supply interference on data lines from two ADCs to FPGA, causing instabilities ~ 7x10-4 % (270/second). The two ADCs are not placed on final PCB (14 positions in total, 12 needed). No time left to fix the design error.

• Fake ALTRO implementation was built incompatible with ALTRO standard. Under rewrite now.

Two particle correlationTwo particle correlation

SAB meeting Helsinki 13

14

PHENIX PHENIX s=200 GeV s=200 GeV 00 and dir- and dir- assoc. distributions assoc. distributionsattempt to measure Fragmentation Functionattempt to measure Fragmentation Function

xE =

rpTa ⋅

rpTtr

pTt2 =−

pTa

pTt

cosΔφ≈−pTa

pTt

Run 5+6 p+p @ 200 GeVIsolated photonsRun 5+6 p+p @ 200 GeVIsolated photons

FF?

fit ~ e−bxE

PYTHIA quark/gluon FFPYTHIA quark/gluon FF

€

D z( ) ∝ z−α 1− z( )β NLD =− d

dzTln dN

dzT( )15

Param. of the local slope by use of Negative Inverse Logarithmic Derivative

Comparison to PYTHIA well Comparison to PYTHIA well understood finallyunderstood finally

16Main reason for the rising trend comes from the sliding fitting window.

17

points are p+p 14 TeV PYTHIA xE distribution, dashed line KKP FF parameterizationNucl. Phys., 2001, B597, 337-369

LHC 14TeVLHC 14TeVPYTHIA-gluon jet (Annihilation) 17 %-u quark jet (Compton) 66 %

PYTHIA-gluon jet (Annihilation) 17 %-u quark jet (Compton) 66 %

2/3/09 DongJo Kim, Prague High pT 2009

NLO :hep-ph/9910252

Fold smeared associated distribution over fragmentation function D(z)

€

dNdpTa | pTt

= dzt

xTt

1

∫ dˆ p Ta Σ' ˆ p Ta | ˆ p Tt( ) 1ˆ p Ta

D pTa

ˆ p Ta( )D zt( )

pTa

s / 2

∫

gamma-hadron hadron-hadron

Development in kT –smearing @ pp

€

Σ' ˆ p Ta | ˆ p Tt( ) ≡ dˆ p Tˆ p Ta ˆ p Tt

2

ˆ p Ta ˆ p Tt

∫ dNdpTa | ˆ p Tt , ˆ p T

Σ ˆ p T( )Smearing effects in parton distribution where

€

Σ ˆ p T( ) ≡ dNd ˆ p T

€

D z( ) ∝ z−α 1− z( )β

1 + z( )−γ

α β γ

gluon 0.16 0.88 13.29

(gluon+quark)/2 0.32 0.72 10.65

quark 0.49 0.57 8.00

test 0.55 0.45 5.00

Fragmentation function in calculations:

Comparison with PHENIX preliminary data:

π0γ FF

FF = (gluon+quark)/2 FF = (gluon+quark)/2

FF = test

In calculations:

€

kT2 = 2.68 GeV

ALICE Central Trigger ProcessorALICE Central Trigger Processor

• CTP Online Monitoring• Being finalized by DongJo Kim

• Trigger Performance analysis– Various Trigger performance study via CTP

trigger shapshot during 2008 Beam Injection– Nobert Novitzky, DongJo Kim, Jan Rak– Toos for Shifters are ready ( DongJo Kim )

20

L1/L2 Class/ClusterCounters ,orbit,bc…..

GRID ComputingGRID Computing• Tier1 with NDGF

– Up and Running for past 2 years• CSC ( sepeli )• Jyaskyla ( opaali )

– Dcache Disk server for an year

• Running smoothly for various simulation and cosmic production and 2008 LHC Beam injection

• Issues – No major technical issues– Coming years plan for maintenances and purchase

• Antti Prinen ( HIP )

21

Running jobs :2008-curent

TeachingTeaching

SAB meeting Helsinki 22