Danilo Domenici – LNF On behalf of the KLOE-2 Collaboration.

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Presentation transcript:

Danilo Domenici – LNF On behalf of the KLOE-2 Collaboration

 KLOE present Status: Detector Data Taking Data Analysis  KLOE Upgrades Status: Crystal Calorimeter - CCAL Quadrupole Calorimeter - QCAL Inner Tracker - IT D. SC.LNF2 Report Overview

Detector Status  EMC is fully functional Calibration with cosmics completed Calibration with Bhabha and γγ in progress  DC is fully functional Two TDC boards under repair (3% of total channels) Calibration with cosmics completed  Trigger is fully functional Two dish boards to be repaired Data Taking / Monitoring / Offline  Online monitoring and DAQ are performing well Few 10’ stops given by daq busy related to beam losses  L3 processes working Online Bhabha selection has a reduced rate due to machine background. New code fixing this problem under test  Night & week-end data taking dedicated to collect data for Amadeus collaboration up to the end of this run Motivation: make some physics out of this data-taking, test data storage to CNAF, training shifts, DAQ and Offline analysis D. SC.LNF3 KLOE Apparatus Today

D. SC.LNF Example of Data Quality T1 – T5 (ns) crossing time of innermost – outermost ECAL layers for cosmic muons Reconstruction of CM Energy for Bhabha events with the DC

D. SC.LNF EMC/DC vs Background  DC hard enough to survive 600 kHz bkg as counted by the EMC  400 kHz of EMC background corresponds to a 30% accidental counts in 100 ns window  1% fakes in a prompt time window

Data Analysis Progress since last SC D. SC.LNF Γ(η → π + π - γ) / Γ(η → π + π - π 0 ) arXiv: Accepted for publication (PLB) DOI /j.physletb UL(φ → ηU, η → π 0 π 0 π 0 ) arXiv: Submitted to PLB γγ → η and Γ (η → γγ) arXiv: Submitted to JHEP a µ had,ππ with σ(π + π - γ)/σ (μ + μ - γ) Final result Draft under review of the collaboration UL( K S → π 0 π 0 π 0 ) Final result Draft in progress φ → K S K L → π + π - π + π - : CPT and Lorentz invariance Preliminary (almost final) result UL(e + e - → Uγ)Preliminary result UL(e + e - → Uh) Preliminary result

Search for Dark Forces D. SC.LNF Hypothesis: existence of a hidden gauge sector, able to explain several unexpected astrophysical observations, weakly coupled with SM through a mixing mechanism of a new gauge boson U with the photon D2D2 22 M U (MeV) →U→U ee→Uee→U e  e  → Uh KLOE preliminary U e+e+ ε2ε2 ε2αDε2αD

CPT & Lorentz Invariance Test D. SC.LNF KLOE-2 preliminary Δa 0 = (-6.2 ± 8.2 stat ± 3.3 sys ) GeV Δa X = ( 3.3 ± 1.6 stat ± 1.5 sys ) GeV Δa Y = (-0.7 ± 1.3 stat ± 1.5 sys ) GeV Δa Z = (-0.7 ± 1.0 stat ± 0.3 sys ) GeV  Neutral kaon interferometry based analysis with π + π - π + π - final state  Search for asymmetry in distribution of decay time difference between the two kaons in the kaon flight direction andevent sidereal time (SME framework)

Detector Upgrades Overview D. SC.LNF Inner Tracker QCAL CCAL

forward plate 8 aluminum shells LYSO crystals produced by SICCAS PCB housing SiPM and calibration LED shell and PCB holder QD0 coupling plate CCALT Layout CCALT Layout 1 calorimeter/side, 4 shells/calo, 3 modules/shell, 4 crystals/module

D. SC.LNF11 CCALT Components and Tests Tests in progress  Energy resolution = % at 511 keV measured for all crystals with 22 Na source and 1Gs/s digitizer  Crystal wrapping: adhesive mylar is chosen  of single crystal σ t ~ 450 MeV  Performance at high rates to be tested with a pulsed UV-LED with Mylar = 15 pC 22 Na Spectra Q (pC) w/o Mylar = 12 pC SiPM Signal

November  Production of forward plates  Production of photodetectors holder plates (3D print in ABS)  Finalization of the design of the QD0 coupling plate  Production of PCB and mounting and test of SiPM December  Production of QD0 coupling plates  Anodization of aluminum parts  Completion of crystals characterization with 22 Na  Wrapping of all crystals  Assembly of all modules  Test of the final FEE chain with cosmics D. SC.LNF12 CCALT Schedule

 QCALT calorimeter consists of 2 dodecagonal structures, covering the region close to IP  Each calorimeter is build in 2 halves to be coupled during insertion to the beam pipe.  Each module (1/12), consists of a sampling calorimeter with 16 towers, each composed by 5 layers of scintillator tiles and 5 layers of W/Cu absorbers  Light from tiles is routed outside using multicladding WLS fibers readout using circular 1.2 mm Ø SiPM  The total number of TDC channels is about D. SC.LNF13 QCALT: detector

 First QCALT already assembled  Each tile tested using 90 Sr source to check fiber-tile coupling  LY of towers measured with cosmic rays  Plastic fiber holder already polished and ready to be coupled to SiPM  All materials (tiles, fibers, tungsten) for second QCALT ready  Mechanical preparation of steel structure and painting done  Tiles grooved, installation in progress D. SC.LNF14 QCALT: detector Half QCALT with W/Cu shielding Fiber holder Tiles/WLS stack Before polishing After polishing

 Final PCB produced and sent to FBK for SiPM bonding  Final SiPM production (round 1.2 mm diameter) completed  Bonding and resining in progress  Test on preliminary PCB satisfying (optical properties, HV working point, gain)  Test of final PCB with cosmics and final FEE chain in progress D. SC.LNF15 QCALT: SiPM

 Full FEE chain electrically tested  Readout based on TDC  No charge measurement needed  SiPM calibration done by measuring dark rate  Cooling by flushing air in each PCB box  tested D. SC.LNF16 QCALT: FEE Test board for single SiPMPreamp and HV regulator board Assembled FEE module

 November-End: final test of FEE chain  December-Mid: assembly of PCB SiPM on the existing modules  December-End: gain calibration of all SiPM  January-Mid: completion of mechanical assembly  January-End: cosmic rays test D. SC.LNF17 QCALT Schedule

D. SC.LNF18 Cylindrical-GEM Inner Tracker  4 layers at 13/15.5/18/20.5 cm from IP and 700 mm active length   rφ  250 µm and  z  400 µm  XV strips-pads readout (20 o ÷30 o stereo angle)  2% X 0 total radiation length in the active region 3 mm 2 mm Cathode GEM 1 GEM 2 GEM 3 Anode Read-out Cylindrical Triple GEM FEE boards

 We have already shown in previous meetings the construction procedure of the Cylindrical-GEM detectors  At the last SC we reported on the successful creation of the first 2 Layers of the IT  Since then the third detector Layer has been completed  Tests with β source and cosmic rays have been accomplished D. SC.LNF19 IT Status Layer 1 Layer 2 Layer 3

FEE 90 Sr Source Scan D. SC.LNF X-view Hits distribution V strips not illuminated V-view Hits distribution FEE

D. SC.LNF21 Cosmic rays Test tracking provided by external 10x10 cm 2 Triple-GEM Test with final HV cables and distributors, final FEE and DAQ system top/bottom scintillators for trigger

Cosmic rays Test D. SC.LNF 3D view Z vs X (Lego View) noise cosmic tracks

D. SC.LNF23 IT Operation at High Temperature  DAFNE has recorded beam pipe temperatures higher than those foreseen (up to 50 °C)  Temperature tests on Layer2 showed some operation instability for T > °C due to the mechanical “relaxation” of the GEM foils To cope with this problem: 1. The DAFNE Interaction Point will be cooled: mock-up tests indicate that the operation temperature can be kept under 30 °C 2. We introduced a 300 µm thick spacing grid between GEM electrodes for L3 and L4 PEEK grid assembledgrid placed around the GEM

Blocking Capacitor D. SC.LNF  During the β source tests we have observed «splash events» with large hit multiplicity  The effect can be explained as X-talk due to capacitive coupling between GEM3Bottom and the Readout plane  Splash events are strongly suppressed by the insertion of a Blocking Capacitor circuit (BC): the current induced on G3Bottom flows to ground rather than into the detector 24 without BC C = 2.2 nF R = 10 Ω BC-PCB

 Layer 4 Cathode already done This week: GEM and readout delivery Up to December-End: GEM test and cylindrical gluings November-End: Readout connector soldering December-Mid: Readout cylindrical gluing December-End: Readout CF lamination January-End: Assembling and sealing  February-Mid: General assembling of 4 IT Layers and test D. SC.LNF25 IT Time Schedule IT Time Schedule

 KLOE is operating properly with a smooth data taking  Analysis of old KLOE data still provides interesting results  All detector upgrades are proceding steadily  Expected completion foreseen for middle of February D. SC.LNF26 Conclusions

D. SC.LNF27

DC Trips D. SC.LNF

Layout of a GEM 25/10/2012D.Domenici - LNF29 Bottom side of the active area is divided in 4 Macro-Sectors (MS), each with its own HV connection tail Top side of MS is furthermore divided in 10 Sectors, all independentely supplied HV tails have 11 connections (1 bottom MS + 10 top S) ending on 0.8 mm fiberglass stiffener Sectorization is for minimizing damage in case of discharge Sector HV independance is for minimizing loss in case of damage: just a single Sector can be turned off 3 mm overlap reagion pinholes HV tails fiberglass stiffener

Manufacturing a C-GEM 25/10/2012 D.Domenici - LNF30 Epoxy glue (Araldite 2011) is distributed by hand on a 2 mm wide line 3 GEM foils are spliced together with a 3 mm overlap and closed in a vacuum bag (0.9 bar) Alignement pinholes Vacuum holes

Manufacturing a C-GEM 25/10/2012 D.Domenici - LNF31 Vacuum bag envelope GEM is protected with a Mylar sheet and wrapped on the cylindrical mold Transpirant tissue (PeelPly from RiBa) is placed around to distribute vacuum Final cylindrical GEM with internal and external rings

Readout Plane 25/10/2012 D.Domenici - LNF32 Readout plane is realized at CERN TE-MPE-EM It is a kapton/copper multilayer flexible circuit Provides 2-dimensional readout with XV strips on the same plane X are realized as longitudinal strips V are realized by connection of pad through conductive holes and a common backplane Pitch is 650 µm for both X strip V strip X pitch 650µm  X res 190µm V pitch 650µm  Y res 350µm

Readout CF Lamination 25/10/2012 D.Domenici - LNF33 The readout is shielded with a very ligth Carbon fiber composite structure realized by RiBa Composites, Faenza, IT The shield is composed by a sandwich of two 90 µm thick carbon foils prepreg with epoxy (Carbon-Epoxy 90g/m2 58% Fibra T300) spaced by a 5 mm thick Nomex honeycomb (ECA-I /16-3.0) first 90µm CF skin5mm HC second 90µm CF skin curing 24h in autoclave final readout electrode

Assembling a triple-GEM 25/10/2012 D.Domenici - LNF34 1.The second electrode (GEM3) is placed on the machine with its mold and 2.Fixed to the bottom plate 3.The top flange with Readout is moved down around the GEM

Blocking Capacitor D. SC.LNF

Material Budget 25/10/2012 D.Domenici - LNF36 Material Radiation Length (cm) Copper1,43 Polyimide - Kapton28,6 Carbon fiber28 Argon14000 Isobuthane17000 Epoxy - Araldite ,5 Honeycomb - Nomex1250 Fiberglass - FR416 Air30500 Aluminum8 Gold0,33 Thickness (µm) Radiation Length (%) Copper31,68E-04 Polyimide501,40E-04 Copper31,68E-04 GEM foil564,76E-04 Copper32,10E-04 Polyimide501,75E-04 Honeycomb30002,40E-04 Polyimide501,75E-04 Copper32,10E-04 Cathode foil31061,01E-03 Gold0,13,03E-05 Copper52,45E-04 Polyimide501,75E-04 Copper51,05E-04 Epoxy12,53,73E-05 Polyimide1254,37E-04 Epoxy12,53,73E-05 Polyimide501,75E-04 Copper32,10E-04 Gold0,13,03E-05 Anode Foil2631,48E-03 Carbon fiber903,21E-04 Honeycomb50002,40E-04 Carbon fiber903,21E-04 CF Shield32009,54E-04 Total 1 Layer4,87E-03 Total 4 Layers1,95E-02 The KLOE-2 requirement of X0 < 2% is fulfilled