1 / 40

Stato dell’esperimento CDF

Stato dell’esperimento CDF. SOMMARIO. Riunione INFN - Gruppo1 Roma, Dicembre 2001 Franco Bedeschi INFN-Pisa. Run IIA: Stato del Tevatron Funzionamento fino ad ora Aspettative nel futuro a breve termine Stato di CDF Rivelatori ( silicio, trigger )

leilani-davidson
Download Presentation

Stato dell’esperimento CDF

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Stato dell’esperimento CDF SOMMARIO Riunione INFN - Gruppo1 Roma, Dicembre 2001 Franco Bedeschi INFN-Pisa • Run IIA: • Stato del Tevatron • Funzionamento fino ad ora • Aspettative nel futuro a breve termine • Stato di CDF • Rivelatori (silicio, trigger) • Primi segnali nei dati raccolti e previsioni per l’estate 2002 • Run IIB: • Piani a lungo termine per il Tevatron • Stato upgrades di CDF per il run IIB • Proposta di piano finanziario per la collaborazione italiana

  2. Tevatron • Commissioning • March 2001: Start commissioning • April 2001: First 36x36 store • June 1: Start “stable” operation • Some unexpected shutdowns • May 2001: Conning tower leaks • July 2001: Refrigeration system failure • Steady running: • End July – Early October • Planned shutdowns • October 8, 2001 – 6 weeks • Now completed: beam back on • July 1, 2002 • Install more p-bar cooling

  3. Tevatron • Luminosity profile • Delivered until October shutdown • 12 pb-1 delivered • 5 pb-1 on-tape • Much commissioning work • Expectations: • 100-200 pb-1 delivered by July shutdown • 400 pb-1 delivered by end of 2002

  4. Tevatron • Peak luminosity • Close to 1031 • Expect better tuning/ transfer efficiencies • ~2x1031 by January 2002 • 3-5x1031 by June 2002 • Improvements: • More p-bar cooling • 5-8x1031 Summer/Fall 2002 • Recycler operational • >1032 sometimes in 2003

  5. Proton source: Not a problem now. Must improve capacity to support also MiniBoone and Minos October shutdown work: High rep. rate kicker installed More shielding Main Injector: Works well October shutdown work: More corrections elements in transfer lines Tevatron: Old but fine October shutdown work: Preventive maintenance Recycler Ring: Still not commissioned October shutdown work: All magnets realigned and refurbished Correction elements installed Cooling improved MI shielding improved P-bar source: Large transverse emittances affected transfer efficiency and beam-beam effects Need more cooling power (summer 2002 SHUTDOWN) October shutdown work: Improved vacuum Stack tail cooling improved Tevatron issues

  6. Tevatron Luminosity Period: 1/15 – 6/15 Variations on situation before Oct. shutdown x2.5 p-bar x1.5 proton >x2 tranf. Eff. Reduce emittances Reasonable! More uncertain Need more cooling After July shutdown

  7. CDF • Massive amount of work during shutdown! Including miniplug installation • Current status: • Silicon: major achievements (see later) • COT: stable operation • TOF: stable operation • Calorimeters: stable operation (miniplugs still being tuned) • Muon systems: • Stable operations for CMU, CMX (excluding miniskirts) • CMP commissioned but suffers for high losses being understood • Commissioning of forward muons is on-going • Trigger: • L1: stable operation • L2: major achievements (see later) • L3: stable operation with more nodes

  8. CDF: Silicon • Major improvement on silicon systems after October shutdown: • SVX II: • Ladders: 310 perfect + 32 usable/360 = 95% • Tracking wedges (4/5): 68/72 = 94.4% (usable by SVT) • ISL: • ~2/3 of detector is cooled • 94% of cooled ladders are working • Major success opening two blockages with laser surgery!!! Will open the whole detector by summer during short accesses • L00: • 47.5/48 functioning ladders • Silicon aligned to beamline to remove bias in SVT triggers

  9. Beamline CDF: fixing ISL L7 • Current status: • L7 is all cooled – 50% of ISL • Power on inner ladders triggers safety protection, due to layer 6 warm up • Reworking interlocks to allow operation • 1/3 of L6 is cooled • Plan is to have all ISL cooled before summer L6 L6 L7 2 readout ladders Module = Ladder cooled and powered Ladder cooled but not powered Ladder not cooled

  10. Inlet/outlet manifolds ~1,5 meters elbows CDF: fixing ISL Must reach blocked elbow through inlet manifolds

  11. CDF: fixing ISL Actual access is from COT face Plan is now to fix ISL in a series of short 3-4 day accesses

  12. CDF: Trigger • All elements for a physics trigger table in hand • Working on a table for first 6 months of 2002 data taking • Done by early January • Lot of L2 problems fixed: • Now cutting on jets and SVT • Running with multiple Alpha • L2 electrons are close • Current trigger more than adequate to deal with luminosity expected in first half of 2002

  13. CDF: SVT L2 cut on SVT Online D resolution • SVT fully functional • Uses tracks from XFT • Online fit of primary V. • Beam tilt aligned • Cutting at L2 • Still missing • Internal SVX alignment

  14. CDF: SVT These plots available atL3 SVT track pair invariant mass show clear evidence of strange and charm after decay length cut Peaks can be used to monitor SVT

  15. CDF: Particle ID Preliminary TOF results p pt GeV/c Preliminary dE/dx Measurements in COT K p

  16. CDF: Data • Currently ~5 pb-1 on-tape • Data Handling: • Over 80 Million events recorded on tape and processed by reconstruction farm • ~ 50 Tbyte of data stored in tape library • Several secondary data sets useful for physics being stripped: • J/y, W, Z, photons, jets, …

  17. W and Z’s 298 W events Central Muons ET >12 GeV From 3.65 pb-1 ET >20 GeV

  18. CDF: J/y m+m- • Clear J/y signal • CMU or CMX • ~ 17,000 y’s • s = 26 MeV/c2 s(J/y) ~ 9 nb % from B ~ 20% First Run II B peak !!!!

  19. 5s xs reach Yellow Book 2000 No L00 Luminosity 5s xs reach BTB PAC proposal No L00 Luminosity CDF Physics by Summer 2002 • Expectation ~ 100-200 pb-1 by Summer 2002 • Incremental improvements and feasibility studies for top, EWK and QCD • Xs mixing parameter should be well within reach Dsfp only

  20. CDF Physics by end of 2002 • Expectation ~ 400 pb-1 by end of 2002 • sin(2b) with good accuracy • Sufficient statistics to update our previous top and W/Z measurements • Hints for new phenomena?! End 2002

  21. Current statusSummary • Tevatron back to pre-shutdown luminosity, but still ~6 month late on expected luminosity profile • The CDF detector is almost out of the commissioning phase and is taking data of good quality • The silicon systems are mostly fixed • L2 trigger is greatly improved and adequate to expected luminosity, in particular SVT works beautifully • We have a good chance of collecting 100-200 pb-1 by Summer 2002 and possibly present first results on xs and (maybe) sin(2b) on a similar time scale.

  22. Future upgrades • Fermilab is pursuing the goal of accumulating 15 fb-1 by FY 2008 • Increase the number of protons on the antiproton target • Better collection efficiency of antiprotons • Better cooling of the antiprotons • Better antiproton transfer efficiency • 200 page TDR available: • http://cosmo.fnal.gov/run2b/Documents/TDR/tdr.pdf

  23. Future upgrades • CDF needs to be upgraded to match this laboratory plan • Run IIA: Lmax ~ 2x1032 and total luminosity 2 fb-1 • Run IIB: L max ~ 5x1032 and total luminosity 15 fb-1 • CDF guidelines: • Implement minimum set of upgrades needed to preserve the current functionality at high luminosity • Upgrades will be installed in a 6-7 month period at beginning of 2005 • Major project deadlines: • October 2001: Run IIB upgrade TDR distributed • November 2001: upgrades discussed with PAC • December 2001: upgrades reviewed by Technical Committee • April 2002: PAC meeting • After PAC: DOE baseline review • Need MOU’s before this meeting

  24. Run IIb • Run IIB TDR completed – Included are: • SVX IIB: new silicon tracker ($ 11.2 M) • Scintillator based preshower ($ 0.76 M) • Replacement of CSX ($ 0.17 M) • EM calorimeter timing ($ 0.40 M) • Event builder/L3 trigger upgrade ($ 0.5 M) • Track trigger upgrade ($ 0.62 M) • Other trigger/DAQ upgrades(???) Need access to the detector - Schedule constrained by 2005 shutdown date Do NOT need access to detector so can be on a longer timescale Total with 30-50% contingency $ 13.7 M TDR available at http://ncdf12.fnal.gov/PAC/pac_Nov_01.html

  25. Run IIB • PAC review November 2, 2001 • Funding available from DOE 2002-2005 is $ 9.1 M • Recommendations: • http://www-cdf.fnal.gov/upgrades/run2b/PAC_Nov01/CDF+D0letterNov01.htm • Should focus on upgrades that are critical for the Higgs search • Simplify the silicon detectors • Concentrate mostly on silicon • Assign 40% contingency to all silicon items • Critical startup work for silicon detector approved: • SVX4 production • Silicon sensor prototypes • Hybrid/custom cable production • Stave mechanical/electrical prototype

  26. Run IIB • CDF acknowledges the limitations in funding, but considers the proposed limitations in scope hard to accept since: • They ignore other major parts of our physics program: • Supersymmetry, technicolor, extra dimensions and other exotic physics seaches • B physics beyond the run IIa • Given the current uncertainties on the final integrated luminosity, improvements of the detector beyond the silicon increase our probability of major discoveries. • Need good foreign support to expand the upgrade beyond the silicon detector replacement. Great time to join CDF! • Japan ~ $ 2.5 M for • silicon sensors • preshower PMT’s

  27. Run IIB • Lab Technical review December 4, 2001 • Reduced list of requests to the Lab to fit in the budget guideline • Silicon replacement (*) • Preshower (*) • Event builder upgrade • These items have received the full support of the review committee • Some upgrades are naturally dealt with as maintenance • L3 computers • CSX replacement (*) • CDF still supports the need for the remaining upgrades and is actively looking for funding out of the Laboratory: • University grants, NFS grants, foreign funds • Upgrades in this category are: • CEM timing (*) • L1 track trigger upgrades • Other Trigger/DAQ upgrades (*) indicates interest from some Italian group http://ncdf12.fnal.gov/trc/Trc_Dec_01.htm

  28. Run IIB • The Italian interests and activities for run IIB are still in the process of coming together • Clear interest for silicon, preshower, CEM timing and CSX • Growing interest to some trigger upgrades in the future • No urgency for funding in 2002except for • our contribution to SVX4 chip production • silicon Power Supply R&D • Preradiator R&D • SJ on CSX scintillator • A funding profile for 2002-2004 should be defined subject to further verification based on the evolution of the interest of Italian physicists and groups, and of the review and funding process in the USA • More details on individual projects follow

  29. Run IIB Silicon • Physics: B, Higgs/Exotic searches, QCD, ….. • Status of approval: • PAC/Lab director recommend to start R&D for all critical elements • SVX4 chip development and production • Cost: 30 kEuro (R&D){funded} + 100 kEuro (1/3 of chip production) • Funding year: 2002 • Foreign Institutions on sub-project: LBL, FNAL • Italian Institutions on sub-project: Padova • Physicists on sub-project: Bacchetta, Neviani, Centro • Power supplies development and production • Cost: 20 kEuro (R&D) + 150 kEuro (1/3 of production) • Funding year: 20 kEuro in 2002, remaining in 2003-2004 • Foreign Institutions on sub-project: FNAL • Italian Institutions on sub-project: Padova • Physicists on project: Bacchetta, Bisello, technical personnel

  30. Run IIB Silicon • SVT modifications: • Cost: 100 kEuro (12 merger boards) • Funding year: 2003-2004 • Foreign Institutions on sub-project: Chicago • Italian Institutions on sub-project: Trieste, Pisa • Physicists on sub-project: Ristori, Belforte, Zanetti at al.

  31. Other run2b projects: Pre-shower • Pre-shower used in > 100 Run I analysis papers • Current implementation with wire chamber cannot stand the rate of run IIB • Need faster scintillator based implementation Pre-shower located after magnet coil in front of central EM calorimeter

  32. Other run2b projects: Pre-shower • Motivations: • Electron ID • Allows data driven bck determination • g/p0 separation (statistical only) • Above 35 GeV cannot separate g from p0 in shower max chamber • Use pulse hight from single and double g in pre-shower • Improve e/g/jet energy measurement • Correct for energy lost in coil p p e Low pt electrons High pt electrons e

  33. Other Run IIB projects • New preshower • Physics: Higgs (jet resolution), g/p0 separation, electron ID • Status of approval (December 2001): • Endorsed by technical review committee. Expect approval at April PAC • R&D, PMT Power supplies, fibers, installation • May have a more significant part on detector construction • Cost: 20 kEuro (R&D) + 130 kEuro production • Funding year: 2002 (R&D), 2003-2004 production • Foreign Institutions: Argonne, Tsukuba, Michigan State • Italian Institutions on project: Pisa (with members fromSiena), LNF • Physicists on project: Lami et al.

  34. CEM timing • Motivation: • Reduce cosmic ray background • Critical for SUSY searches which rely on photons • Our eeggET had 2 EM object missing timing information! SM Background estimate of 10-6

  35. CEM timing • Examples: • EWK physics: Wg,Zg production • SUSY searches: N2g G ~ ~

  36. Other Run IIB projects • EM Calorimeter timing • Physics: photon purity (SUSY), long lived particles decaying to g (SUSY) • Status of approval: • Approval not requested until better understanding of CEM PMT base modification impact is reached. • Discriminator boards (LNF design – same as Run IIA) • Cost: • 150 kEuro • Funding year: 2003-2004 • Foreign Institutions: Texas A&M, Chicago • Italian Institutions: LNF • Physicists on project: Cordelli at al.

  37. Other Run IIB projects • CMX Scintillator Counters • Physics:all muon related signatures • Status of approval: • Lab approval not required. Will be treated as a detector maintenance project. CDF will decide based on the understanding of the counter performance and their degradation. However: • Delaying too much may compromise possibility of replacement during the 2005 shutdown. Building now is an insurance toward likely future degradation. • Counter fabrication/installation and commissioning • Cost: • 85 kEuro (scintillator/fabrication – 50% of all counters) + • 75 kEuro (installation and refurbishing of current system) • Funding year: 2002?(85 kEuro), 2003-2004 (75 kEuro) • Foreign Institutions: JINR-Dubna • Italian Institutions: Udine (with physicists from Pavia, Trieste, Roma), Pisa • Physicists on project: Pauletta, Menzione et al.

  38. Run IIB • Richieste alla commissione: • 2002: 140 KEuro + 85 KEuro S.J. per CSX • 2003-2004: approvazione di massima della congruita’ del piano finanziario • Tale piano costituirebbe la base per la scrittura delle MOU sul Run IIB • Tale piano andra’ rivisto in caso di crescita della collaborazione italiana

  39. Run IIB • Confronto con gli altri contributi internazionali • Il contributo italiano appare modesto • Sia considerando che costituiamo il 13.5% della collaborazione • Sia confrontato con quello del Giappone (6.1% della collaborazione)

  40. Conclusioni Run IIB • Fermilab sta iniziando un impegno serio per aumentare quanto possibile la luminosita’ del Tevatron • Gli esperimenti CDF e D0 devono di conseguenza modificare i propri apparati per potere sopportare la maggiore luminosita’ sia instantanea che integrata previste dal 2005 in poi • Tale necessita’ e’ stata riconosciuta sia da un comitato interno a CDF, che dal PAC e da un ulteriore comitato tecnico esterno. • Su alcuni degli upgrades proposti si sta concentrando l’interesse di diversi gruppi italiani • La presente proposta che avanziamo alla CSN1 rappresenta un quadro di massima del prevedibile finanziamento pluriennale. Nel prossimo futuro verranno meglio definite le forze impegnate e gli impegni da assumere.

More Related