The Experimental H.E.P. Group of the. Outline
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1 The Experimental H.E.P. Group of the Universidad Autónoma de Madrid a Luis Labarga Departamento de Física Teórica Universidad Autónoma de Madrid Dates and People Outline The ZEUS experiment The GRID project: Distributed Computing for the LHC The ATLAS experiment: Construction of the Liquid Argon Electromagnetic Calorimeter a RECFA Meeting. Barcelona, March 2003
2 Brief History of the HEP-EXP UAM Group 1984 Group formation TASSO experiment at PETRA (DESY): data taking and physics analysis ZEUS experiment at HERA (DESY): R& D, construction and preparation of physics 1992 ZEUS experiment: data taking, physics analysis and upgrades 1995 ATLAS experiment at LHC (CERN): R& D, construction and preparation of physics 2001 GRID - Distributed Computing for the LHC:. R& D
3 Members of the Group Name Position ZEUS ATLAS GRID F. Barreiro C.U. L. Labarga T.U. J. del Peso T.U. J. Terrón T.U. C. Glasman RyC E. Tassi T.U.I. C. Oliver C. Madrid F. S. Rodier P. Ayudante M. Vázquez Min. Sci. F. M. Zambrana Min. Sci. F. R. García Computing E. J.J. Pardo Computing E.. J. Setien Mechanical E. F. Gallardo Technician (P) S. López Technician D. Ruiz Technician
4 The ZEUS Experiment
5 Hardware Contributions (Mechanics) Wave Length Shifter light guides and their Mechanical Case-supports for the first sampling (of 2) of the F R Had. Calorimeters: 2 x 2K pcs. Wireing of the Forward Tracking Detector (consisting. of 3 x 3 planar drift chambers): 4.5K sense wires + 5.3K potential wires Internal support aluminum structures for the FTD Lead plates with precission drilled holes for the Forward Plug Calorimeter
6 Hardware Contributions (Electronics) Front-end for the Forward Calorimeter PM bases for the whole FCAL: 4.3 K pcs. CAMAC HV controlers: 20 boards VME HV controlers: 250 boards HV distribution boards: 500 boards Data distribution boards: 500 boards For other components Shaper-Amplifiers for the Hadron Electron Separator (hybrid technology): 10K pcs. Analog boards (for housing shapers + pipelienes + buffers + their services) for the HES: 400 boards. Analog boards for the Small angle Rear Tracking Detector: 50 boards
7 Hardware Contributions to ZEUS; Summary In cost: 1.5 MEuros In percentage 2 % of total ZEUS
8 Instrumentation papers by UAM-HEP members during the ZEUS R&D, Construction and Upgrade phases (I) Calorimetry 1 Monte Carlo study of the light yield, uniformity of response and energy resolution of electromagnetic calorimeters with fiber read-out. L.A. Labarga and E. Ros; Nucl. Inst. Meth. A249 (1986) Tests results for an electromagnetic calorimeter with fiber read-out; F. Barreiro, B. Loehr, E. Ros and S. Weissenrieder; Nucl. Inst. Meth. A254 (1987) An electromagnetic calorimeter with scintillator strips and WLS readout; F. Barreiro, J. del Peso, L. Labarga, B. Löhr, J. Mata and E. Ros; Nucl. Inst. and Meth. A257 (1987) Experimental study of Uranium Plastic Scintillator Calorimeters; G. d Agostini et al.; Nucl. Inst. and Meth. A274 (1989) Response of a Uranium-Scintillator calorimeter to electrons, pions and protons in the momentum range GeV/c; A. Andresen et al.; Nucl. Inst. and Meth. A290 (1990) Construction and beam tests of the ZEUS forward and rear calorimeter; A. Andresen et al.; Nucl. Inst. and Meth. A309.(1991) The ZEUS Forward Plug Calorimeter with Lead-Scintillator Plates and WLS Fibers Readout; G. García, J. del Peso et al.; Nucl. Inst. and Methods A450 (2000) 235.
9 Tracking Chambers 8 Design, construction and test results of the ZEUS forward tracking detector;b. Bock et al.; Nucl. Inst. and Meth. A344 (1994) Beam Test of Silicon Strips Sensors for the ZEUS Micro Vertex Detector; I. Redondo et al.; Accepted for publication by Nucl. Inst. and Methods A. e-print Archive: hep-ex/ Electronics et al. 10 Design and performance of a 10 MHz CMOS analog pipeline; W. Buttler et al.; Nucl. Inst. and Meth. A227 (1989) Design and implementation of a high precision readout system for the ZEUS calorimetr; A. Caldwell et al.; Nucl. Inst. and Meth. A321 (1992) Measurement of the time development of particle showers in a uranium scintillator calorimeter; A. Caldwell. L. Hervas, J.A. Parsons, F. Sciulli, W. Sippach, L. Way; Nucl. Inst. and Meth. A330 (1993) Running experience with the ZEUS Calorimeter; L. Hervas; IEEE Trans. Nucl. Sci (1994)
10 ZEUS Publications by UAM-HEP members Jet Production and QCD 1 Observation of hard scattering in photoproduction at HERA. Phys. Lett. B297 (1992) Observation of two-jet production in deep inelastic scattering at HERA. Phys. Lett. B306 (1993) Observation of direct processes in photoproduction at HERA. Phys. Lett. B322 (1994) Inclusive jet differential cross sections in photoproduction at HERA. Phys. Lett. B342 (1995) Dijet Angular Distributions in Resolved and Direct Photoproduction at HERA. Phys. Lett. B384 (1996) Measurement of Jet Shapes in Photoproduction at HERA Eur. Phys. J. C2 (1998) 1, High-ET Inclusive Jet Cross Sections in Photoproduction at HERA. Eur. Phys. J. C4 (1998) 4, Measurement of Jet Shapes in High Deep Inelastic Scattering at HERA. Eur. Phys. J. C8 (1999) 3, Measurement of dijet production in NC DIS at high and determination of. Phys. Lett. B507 (2001) Dijet production in NC DIS at HERA. Eur. Phys. J. C23 (2002) 1, 13-27
11 11 High-mass dijet cross sections in photoproduction at HERA Phys. Lett. B531 (2002) Inclusive jet cross sections in the Breit frame in NC DIS at HERA and determination of. Phys. Lett. B547 (2002) Study of the azimuthal asymmety of jets in NC DIS at HERA. Phys. Lett. B551 (2003) Measurement of subjet multiplicities in NC DIS at HERA and determination of. DESY , Submitted to Phys. Lett..
12 Inclusive jet cross sections in the Breit frame in NC DIS at HERA and determination of Physics Letters B 547 (November 2002) For instance: dσ/de B T,jet (pb/gev) ZEUS ZEUS NLO QCD: Jet energy scale uncertainty (corrected to hadron level) α s (M Z )= DISENT MRST99 (µ R =E B T,jet ) DISENT MRST99 (µ R =Q) 125 < Q 2 < 250 GeV 2 ( 10 5 ) 250 < Q 2 < 500 GeV 2 ( 10 4 ) 500 < Q 2 < 1000 GeV 2 ( 10 3 ) 1000 < Q 2 < 2000 GeV 2 ( 100) 2000 < Q 2 < 5000 GeV 2 ( 10) Q 2 > 5000 GeV 2 ( 1) E B T,jet (GeV) From a NLO QCD fit to d /d for GeV! #"%$'&($ *),+*-.+/ *-.+/+ 0*3 #"%4,"%$ ),+*-.+/ *-.+/+ 76 8$*9
13 Physics Letters B 547 (November 2002) And also the runing of α s (E T,jet B ) ZEUS ZEUS Theoretical uncertainty from α s (M Z )= E B T,jet (GeV)
14 ZEUS Publications by UAM-HEP members Diffraction 15 Observation of jet production in deep inelastic scattering with a large rapidity gap at HERA. Phys. Lett. B332 (1994) Observation of hard scattering in photoproduction events with a large rapidity gap at HERA. Phys. Lett. B346 (1995) Diffractive hard photoproduction at HERA and evidence for the gluon content of the pomeron. Phys. Lett. B356 (1995) Event Shape Analysis of DIS events with a LRG at HERA. Phys. Lett. B421 (1998) Three-jet production in diffractive DIS at HERA. Phys. Lett. B516 (2001) 3-4, Difractive Dijet Cross Sections in Photoproduction at HERA. Eur. Phys. J. C5 (1998) 41-56
15 Diffractive Hard Photoproduction at HERA and Evidence for the Gluon Content of the Pomeron Physics Letters B 356 (1995) Jet Cross Sections in Photoproduction with a LRG. In the framework of a factorisable difractive model, a hard gluon spectrum Pomeron is needed to describe the data.
16 If we combine the previous result with the measured ZEUS F :. The data indicates that 30% - 80% of the momentum of the Pomeron carried by partons is due to hard gluons
17 ZEUS Publications by UAM-HEP members Heavy quarks 21 Study of production in collisions at HERA. Phys. Lett. B349 (1995) Neutral strange particle production in deep inelastic scattering at HERA. Z. Phys. C68 (1995) Differential Cross Sections of Photoproduction in Collisions at HERA. Phys. Lett. B401 (1997) Production in DIS at HERA. Phys. Lett. B407 (1997) Charged Particles and Neutral Kaons in Photoproduced Jets at HERA. Eur. Phys. J. C2 (1998) 1, Measurement of production and the charm contribution to F in DIS at HERA. Eur. Phys. J. C12 (2000) 1, Others 27 Initial Study of deep inelastic scattering with ZEUS at HERA. Phys. Lett. B303 (1993) Study of Charged-Current Interactions at GeV with the ZEUS Detector at HERA. Z. Phys. C72 (1996) Search for single-top production in ep collisions at HERA. DESY , Submitted to Phys. Lett.
18 Measurement of D production and the charm contribution to F in DIS at HERA The European Physical Journal C 12 (2000) 1,
19 . Good description F by NLO QCD with a PDF extracted from
20 _ F 2 cc x. Universality of the Gluon Distribution x
21 SUMMARY of ZEUS Publications by Exp. HEP UAM members RECFA Meeting, Madrid 1997: Total number of publications by ZEUS: 45 ZEUS publications by UAM-HEP members: 11 ZEUS pubs. by UAM-HEP members (in percentage): 24 % RECFA Meeting, Barcelona 2003: Total number of publications by ZEUS: 124 ZEUS publications by UAM-HEP members: 29 ZEUS pubs. by UAM-HEP members (in percentage): 23.4 %
22 The GRID Project: Distributed Computing for the LHC
23 Goal 1. Analyse LHC data and contribute to generation of simulated events. 2. Participate in the Data Challenge of the ATLAS experiment as a step towards the previous goal. Carry Out LHC Computing Grid (LCG) in coordination with other 6 spanish institutes (LCG-ES project). Main tasks in the context of the LCG-ES project: Coordination of a distributed computing cluster for generation of (ATLAS, CMS and LHCb) Monte Carlo events. Build in our lab a PC cluster integrated in the int. grid LCG, for data analysis purposes. European DataGrid (EDG). Tasks within the EDG project:. Software development in the WP4 WorkPackage, Fabric Management. Test of different releases in the WP6 WorkPackage, Testbed.
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25 Outside UAM Inside our lab Jobs Data Software
26 The Beginning....
27 The ATLAS Experiment Design Construction and Test of the Liquid Argon Electromagnetic Calorimeter
28 The Physics Case; its Implications The main goal of ATLAS at the LHC is the study of the origin of mass at the electroweak energy scale. For SM Higgs boson (H) searches, the detector has to be sensitive to: 1. H ; m 150 GeV. 2. H ; 130 GeV m m 3. H or ; m m 4. H jets or jets ; for m up to 1 TeV. In particular the significance of (1) is proportional to the rapidity range coverage.. Also (1) needs an energy resolution well below 1% at high energy. s is required along as much solid angle as possible. A superb measurement of s and EM sampling calorimetry with ionizable liquid (LArg) and novel accordion geometry with extreme geometrcal and electrical uniformity requirements.
29 The EndCap of the LArg EM Calorimter EM Accordion Calorimeters Hadronic Tile Calorimeters Hadronic LAr End Cap Calorimeters Forward LAr Calorimeters. Sampling Unit : Lead Absorber / Honey Comb Spacer / Read Out Electrode / (Honey Comb Spacer / Read Out Electrode / Lead Absorber /... )
30 Sharing of Responsabilities Lead Absorbers: Honey Comb Spacers: Read-Out Electrodes: Main Structure: mostly UAM mostly CPPM other collaborators mostly CPPM Cold Electronics: UAM and CPPM at Stacking: UAM and CPPM at Test Program at CERN: UAM and CPPM at
31 Main Particularities Each EndCap wheel is splitted into two sub-wheels due to mechanical limits pseudorapidity ranges: OW: IW: 8 modules per EndCap 96 / 32 gaps (absorber - spacer - electrode - spacer - absorber) at the outer / inner wheel per module. Main components vary along : - Fold angle - Gap distance - HV settings - Capacitances
32 the Absorbers Thickness of:/at O. W. I. W. Lead plates 1.7 mm 2.2 mm Stainless steel 0.2 mm Glass-fibre 0.15 mm prepreg adhesive Absorber 2.4 mm 2.9 mm The contribution of the non uniformities at the mechanical parts to the constant term should be kept at. lead thickness better than (from M.C. studies) RMS thicknesses smaller than! / for OW/IW LArg gap better than absorber geometry for reproducibility at the level large/inner radius part Lead plates were obtained by lamination on a standard foundry,. with the thickness measured and corrected on - line by an X-ray absortion measurement system. better than thickness uniformity achieved
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34 The Absorber Fabrication a Flat Sandwich Bending: Mechanical tolerances at the 150 distances of 2 ) level (over a Tooling manufacturated by Talleres Aratz S.A.; absorber fabrication itself by Fibertecnic S.A.. Both companies are located at Vitoria (Spain).
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36 Absorber Moulding and Curing (Autoclave technique): Temperature/Preasure cycle (120 C/2.7 bars) for the prepreg to polimerize and the absorber to get its final shape.. 10 (4) OW (IW) absorber moulds Mechanical Reproducibility at the level
37 Quality Controls on the Produced Absorber: - Optical inspection (100%) - Thicknesses and widths at predifined positions (100%) - Full 3D mapping (10%) For example, the thicknesses at the edges: Mean RMS E-01 Mean RMS E thickness (mm) thickness (mm) Thickness RMS Acute edge Obtuse Edge obtained: tolerances: The prod. yield (along the whole process) is %
38 Rest of Material for the sampling unit: Final OW electrode fully equipped: Set of Honey Comb Spacers:
39 Module Stacking A fully equipped stacking site at UAM:.
40 Stacking Procedure: - last inspection and cleaning of absorber and electrode - HV test of spacers (Voltage nominal at LArg) - stack gap (spacers - electrode - spacers -absorber) - bulgging check/measurement i.e. relative height of each fold (severe problem at the first modules):.
41 Stacking Quality Control II: HV Test Program HV settings: those nominal at LArg (notice that the ratio between the dielectric coefficients of LArg and Air is ) - After stacking one gap ( min.): test the stacked. gap and the previous one - Night test ( hours): leave at HV the gaps stacked during the day Week-End test ( hours): leave at HV the gaps stacked during the week + 5
42 Stacking Quality Control III: Miscellanea Structure Deformations (4 times during the stacking of a module) Deformations smaller ; first than modules showed as much as 2 Cell Capacitances: To spot any last minute failure either at the electrode or in the chain electrode - summing board - mother board
43 Cold Electronics HV Distribution Boards: 576 of 9 different types Summing Boards (Controlled Impedance Techinque): 3888 of 32 different types Test Boards: 2232 of 10 different types.
44 Module Preparation and Transport to CERN.
45 Module Testing Cold Test Program at CERN (all modules) we use the NA31 cryostat Charge Injection Resistance at Mother Board measurement: to check the MB and the signal cable continuity. Stand-alone calibration system to a) fully check the calibration and read-out circuitry b) cell gains. High Voltage (at warm, at cold, at warm): HV problems that were not present at the stacking site develop (or dissapear) during the above cycle. Major concern. The problematic electrode sectors are connected to individual spare HV lines.
46 Beam Test Program (20% of the modules): CERN H6 beam line (North Hall E.A.) Resolution vs. Energy at Module 0. Fit to σ E /E (%) σ E /E=a E / E b E a E =10.35± 0.05% GeV 1/2 b E = 0.27± 0.02% E beam (GeV) a E (% GeV 1/2 ) Outer Wheel Inner Wheel 11 Evolution with E of and terms b E (%) η η
47 Production Module M05: scans. Uniformity results (preliminary): no corrections time, HV, and slope
48 Status Status of Components: - Structure parts (rings etc.): ready - Absorbers: producing those for module no Electrodes: ready - Spacers: producing those for module no Cold Electronics: ready. Status of Modules: - 9 modules at CERN fully tested and qualified - 1 module being stacked at CPPM - 1 module just finished at UAM to be shipped to CERN on monday We dont envisage new major problems on the modules But now comes the EndCap assembly...
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