1. Danilo Domenici on behalf of the KLOE-2 Inner Tracker sub-group Novosibirsk

2. INSTR2014 – Novosibirsk D. Domenici – INFN-LNF 2  Calorimeter System EMC – Lead / Scintillating Fibers / PMT Barrel and Endcaps QCAL – Tungsten / Scintillating Tiles / SiPM Quadrupole Instrumentation CCAL – LYSO Crystal / SiPM Low angle  Tracking System DC – Helium 3.7m x 4m Drift Chamber IT – 4 Layers Cylindrical GEM Inner Tracker  Superconductive Magnet 0.52 T solenoidal field  DAFNE φ -factory e + e – at 1020 MeV 5 ÷ 10 fb -1 in 3 years  Physics program Ks, η, η S rare decays Quantum interferometry Dark photon search

3. INSTR2014 – Novosibirsk D. Domenici – INFN-LNF 3  70 cm active length  650 μ m pitch strip readout  20k GASTONE FEE channels  1300 HV channels  Ar/Iso:90/10 gas mixture  20000 gas gain  3/2/2/2 mm triple-GEM layout  2% X 0 material budget 4 cylindrical-GEM detectors 41 cm36 cm 31 cm26 cm

4. INSTR2014 – Novosibirsk D. Domenici – INFN-LNF 4 700 mm 300 ÷ 430 mm  First batch ever produced with a single-mask etching technique developed by CERN-TE-MPE-EM and RD51 to produce large area foils  The top side of the active area is divided in 40 sectors  The HV connections are grouped in 4 tails  Each sector can be set to down voltage, ground or float by an external jumper in HV distributors

5. INSTR2014 – Novosibirsk D. Domenici – INFN-LNF 5 few sectors with current > 1 nA @600 V Few sectors with discharge rate > 10/h @600 V  GEM are tested in a N 2 flushed plexiglass box to reduce RH below 10%  Each Sector must draw a current < 1nA @ 600V  Discharge rate is measured over a period of ~1h Final yield: 76% (12 bad foils over 50)

6. INSTR2014 – Novosibirsk D. Domenici – INFN-LNF 6 3 GEM foils are spliced together with a 3 mm overlap GEM is rolled on a cylindrical mold A cylindrical GEM is obtainedGlue polymerization in a vacuum bag

7. INSTR2014 – Novosibirsk D. Domenici – INFN-LNF 7 Built at CERN TE-MPE-EM as a kapton/copper multilayer flexible circuit. 2-D readout with XV strips on same plane:  X are realized as longitudinal strips  V are realized by connection of pads through conductive vias and a common backplane  Total thickness is about 300 µm 1k strips 1M pads 650µm ~ 30°

8. INSTR2014 – Novosibirsk D. Domenici – INFN-LNF 8 The GEM is fixed at the bottom of the insertion machine with its mold. Redout is fixed to the top Both electrodes are axially aligned with precision of 0.1mm/1.5m Readout is moved down around the GEM. Eventually the mold is extracted. Procedure is repeated for all electrodes CF clad readout plane GEM

9. D. Domenici – INFN-LNF 9INSTR2014 – Novosibirsk 3.14 2013

10. INSTR2014 – Novosibirsk D. Domenici – INFN-LNF 10 Technology0.35 CMOS - no radhard Sensitivity (pF)20 mV/fC Z IN 400 Ω (low frequency) C DET 1 – 50 pF Peaking time90 – 200 ns (1-50 pF) Noise (erms)800 e - + 40 e - /pF Channels/chip64 ReadoutLVDS/Serial Power consum.≈ 0.6 mA/ch 128 channels GASTONE Board  Mixed analog-digital circuit  Low input equivalent noise, low power consumption and high integrated chip  4 blocks: 1. charge sensitive preamplifier 2. shaper 3. leading-edge discriminator 4. monostable

11. D. Domenici – INFN-LNF 11INSTR2014 – Novosibirsk Temperature probes control Temperature history monitor 2 cooling systems dedicated to IT  Air blowing between BP and IT  Water radiators on FEE Heat sources  Beam-pipe (lumi dependent)  FEE: 180 chips = 100W per side

12. INSTR2014 – Novosibirsk D. Domenici – INFN-LNF 12 DAFNE new Interaction Regione instrumented with the new detectors IT inserted around the DAFNE beam pipe, spherical around the interaction point

13. INSTR2014 – Novosibirsk D. Domenici – INFN-LNF 13 IT cabled and shielded Each IT side has:  90 readout cables  69 HV cables  36 gas tubes  8 cooling tubes  6 temp. probes cables Detail of connectors zone One side fully cabled

14. INSTR2014 – Novosibirsk D. Domenici – INFN-LNF 14 Steel shell used to grab the IR Rails to support and insert IR IR inside DC with all the cables outside

15. INSTR2014 – Novosibirsk D. Domenici – INFN-LNF 15 0.52T KLOE field Drift Chamber  rφ  200 µm -  z  2000 µm Inner Tracker  rφ  200 µm -  z  370 µm r-φ resolution (bending plane) 200 µm Z resolution (transverse pl.) 370 µm Spread of charge due to the magnetic field simulated with Garfield K S  π + π – Vertex Resolution 2 mm ≈ cτ S /3

16. INSTR2014 – Novosibirsk D. Domenici – INFN-LNF 16 Efficiency Layer 185% Layer 289% Layer 390% Operational parameters still to be optimized Cosmic-ray muon sample selected with EMC X strips multiplicity V strips multiplicity

17. INSTR2014 – Novosibirsk D. Domenici – INFN-LNF 17 EMC + DC IT

18. INSTR2014 – Novosibirsk D. Domenici – INFN-LNF 18 KNEDLE Kloe New Event DispLay Environment ROOT - based

19. INSTR2014 – Novosibirsk D. Domenici – INFN-LNF 19 March 2013August 2013February 2014 KLOE new detectors Construction conclusion Insertion in KLOE Commissioning conclusion* Dafne upgraded IR construction coclusion Still in commissioning** * Still working on Zero-suppressed data format and Event display ** Beams already collided in no-stable conditions. Still luminosity to be increased (x5), background to be reduced (1/10) 8 february luminosity plot

20. INSTR2014 – Novosibirsk D. Domenici – INFN-LNF 20  KLOE-2 experiment at DAFNE has started with the aim of 3 years of data taking and 10 fb -1 of integrated luminosity for a physics program based on rare decays, quantum interferometry and search for dark bosons  The tracking system is composed by a Helium Drift Chamber and a new gaseous Inner Tracker realized with fully Cylindrical-GEM detectors  The intrinsic lightness and flexibility of the GEM allowed us to develop a vertex detector with an optimal geometry and a total thickness corresponding to only 2% of a radiation length  State-of-the-art solutions have been expressly developed for or tuned with this project: GASTONE front-end chip, single-mask GEM etching, polyimide plated holes, multi-layer readout circuit, PEEK spacer grid  After 8 years of R&D and construction we are now eagerly waiting for the first stable collisions by DAFNE

21. INSTR2014 – Novosibirsk D. Domenici – INFN-LNF 21

22. INSTR2014 – Novosibirsk D. Domenici – INFN-LNF 22

23. INSTR2014 – Novosibirsk D. Domenici – INFN-LNF 23 Inner Tracker - IT QCAL CCAL QCAL CCAL

24. D. Domenici – INFN-LNF 24  To avoid possible relaxation of the gaps due e.g. to thermal expansion of the foils, we fix a spacing grid on the GEMs (only for Layers 3 and 4)  It is realized by assembling 8 rings and 12 rods of 300 µm thick PEEK PEEK grid assembled grid fixed on the GEM INSTR2014 – Novosibirsk

25. D. Domenici – INFN-LNF 25 HV control Nanoamp Current control INSTR2014 – Novosibirsk

26. D. Domenici – INFN-LNF 26 Material Radiation Length (cm) Copper1,43 Polyimide - Kapton28,6 Carbon fiber28 Argon14000 Isobuthane17000 Epoxy - Araldite 201133,5 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 Epoxy257,46E-05 Polyimide501,75E-04 Epoxy257,46E-05 Polyimide501,75E-04 Copper32,10E-04 Gold0,13,03E-05 Anode Foil2631,29E-03 Carbon fiber903,21E-04 Honeycomb50004,00E-04 Carbon fiber903,21E-04 CF Shield32009,54E-04 Total 1 Layer4,75E-03 Total 4 Layers1,90E-02 Very light detector < 2% of a radiation length Gas (90% Ar – 10% iC4H10)90006,29E-05

27. INSTR2014 – Novosibirsk D. Domenici – INFN-LNF 27  Working gain with Ar/Isobuthane (90/10) is 2 x 10 4  Fields values: 1.5/3.0/3.0/5.0 kV/cm for Drift/Transfer1/Transfer2/Induction  GEM values: 295/285/270 V  Efficiency decrese with B Filed due to spread of the charge KLOE gain