1 / 21

Status of KLOE-2 Inner Tracker 

Status of KLOE-2 Inner Tracker . JOINT-GEM meeting Helsinki 15 July 2010 G.Bencivenni. The Inner Tracker group. G. De Robertis , N. Lacalamita , R. Liuzzi , F. Loddo , M. Mongelli , A. Ranieri , V. Valentino INFN Bari, Bari, Italy G. Morello , M. Schioppa

tyler
Download Presentation

Status of KLOE-2 Inner Tracker 

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. Status of KLOE-2 Inner Tracker  JOINT-GEM meeting Helsinki 15 July 2010 G.Bencivenni

  2. The Inner Tracker group G. De Robertis, N. Lacalamita, R. Liuzzi, F. Loddo, M. Mongelli, A. Ranieri, V. Valentino INFN Bari, Bari, Italy G. Morello, M. Schioppa INFN Cosenza, gruppocollegato LNF, Cosenza, Italy A. Balla, G. Bencivenni, S. Cerioni, P. Ciambrone, E. De Lucia, D. Domenici, J.Dong, G. Felici, M. Gatta, M. Jacewicz, S. Lauciani, V. Patera, M. Pistilli, L. Quintieri, E. Tshadadze LaboratoriNazionalidiFrascati - INFN, Frascati, Italy A. Di Domenico, M. Capodiferro, A. Pelosi INFN Roma, Roma, Italy

  3. Read-out Anode 2 mm GEM 3 2 mm GEM 2 2 mm GEM 1 3 mm Cathode Induction Transfer 2 Transfer 1 Conversion & Drift Inner Tracker Project • 4 trackinglayers with radii from 13 to 23cm (1 layer removed for a safe insertion) • 700 mm active length • XV strips-pads readout (40o stereo angle) • 1.5% X0total radiation length in the active region with Carbon Fiber supports still a factor 2.5÷3 improvement on KS → p p vertex resolution Cylindrical Triple GEM Cylindrical GEM technology

  4. R&D step by step 2008.C-GEM prototype using 3 (354x330 mm2) GEM foils spliced together with simplified readout. No final readout. No final GEM 2009.100x100 mm2 planar chambers with XV readout pattern for study in magnetic field. Final readout. No final GEM 2010.Two large (300x700 mm2) planar chambers with the new single-mask GEM foils and XV readout. Final readout and final GEM

  5. Cylindrical-GEM prototype 3 spliced foils vacuum bag 960 mm 352 mm Ø=300mm, L=350mm 1538 axial strips 650 µm pitch Very light detector: no frames in the active area

  6. GASTONE: the IT FEE chip 0.35 CMOS - no Radhard • Mixed analog-digital circuit • Low input equivalent noise, low power consumption and high integrated chip; • 4 blocks: • charge sensitive preamplifier • shaper • leading-edge discriminator (prog. thr.) • monostable (stretch digital signal for trigger) GASTONE 64 ch

  7. C-GEM prototype: test beam Gas: Ar/CO2 = 70/30 Gain: ~2·104 FEE: 16-channels GASTONE Tracking: 2x8-MDT stations MDTs MDTs 10 GeV pion beam CERN-PS T9 area Spatial Resolution (GEM)=(250µm)2 – (140µm)2  200µm Efficiency ε = 99.6%

  8. X pitch 650 µm 40° V pitch 650 µm XV readout stuides • 10x10 cm2 planar GEM for readout study in magnetic field • Readout is a multilayer kapton circuit with XV pattern of copper strips and pads: • X-view will provide r-φcoordinate in CGEM • V-view made of pads connected by internal vias and with ~40°stereo angle • XV crossing will provide z coordinate in CGEM Garfield simulation of B field XV

  9. Test beam in magnetic field • H4 beam-line at CERN-SPS: 150 GeV pions • Goliath Magnet: dipole field up to 1.5T in a ~3x3x1m3 • Semi-permanent setup for RD51 users dipole magnet Gas: Ar/CO2 = 70/30 Gain: ~2·104 FEE: GEMs partially equipped with 22 GASTONE boards Trigger: 6 scintillators with SiPM (3 upstream, 3 downstream) External Trackers: 4 planar GEMs w/650 µm pitch XY strips X-Y GEMs BEAM X-V GEM

  10. Testbeam in magnetic field sx = 200 mm CGEM r-φ resolution (bending plane) KLOE B - field working point Increase of B field requires a higher gain CGEM z resolution

  11. Large area GEM hole section • GEM foils up to 350x700mm2 are needed for the IT (3 are spliced together for 1 electrode) • After a change in the GEM manufacturing technique and >1 year R&D by CERN TS/DEM we received the first large GEM foils in April • Two planar prototypes built with the final dimensions of IT foil for pre-production test Very large GEM: 0.21 m2

  12. 300mm Large planar prototype GEM are stretched on a custom-made machine with a tension of ~1kg/cm measured by load-cells 700mm FR4 frame is glued on the GEM with a vacuum-bag. The result is a planar foil (20 µm sag) with no need of frames inside the active area.

  13. XV readout • The prototype has been assembled with the final KLOE-2 readout: XV strips with 650 μm pitch (~220k vias) • It will be equipped with GASTONE-64 and tested CERN-T9 in october 2010 first GEM framed and placed on the readout XV

  14. Final assembly Closing of the chamber A heavy Al plate is placed to distribute the pressure final gluing w/gas vacuum

  15. Preliminary tests cosmic ray 137Cs gamma source The detector has been flushed with Ar/CO2 (70/30) and tested in current-mode with a 137Cs source (660 keV photons). Cosmic ray test is starting soon.

  16. Optimization of the fields Only slight difference between the two GEM (due to different hole shapes?) Final operating fields values: 1.0 – 3.0 – 3.5 – 6.5 kV/cm (Drift – Transf1 – Transf2 – Induction) Equal charge sharing occurs at higher induction field in the single-mask 4.8 6.5

  17. Gain measurement • The different shape of the hole affects the gain of the GEM • Gain ~25% lower in single-mask GEM • Only ~20 V increase in the operating voltage of a Triple-GEM to reach same gain • NO discharge observed up to 40000 gain Very stable operation

  18. Inner Tracker project CF load test IT sketch KLOE-2 beam pipe with the IT Technical Design Report of the Inner Tracker for the KLOE-2 experiment [arXiv:1002.2572]

  19. Time Schedule • Tooling and Components • Cylindrical moulds to make electrodes: end of June (L1) – end of July (L2) • Detector mechanics (fiberglass rings): mid of july • Quality control system (microscope + HV test box): nearly ready • GEM foils: G1 (23 July), G2,G3 (20 Aug) • Readout anode circuits: 20 Aug • Vertical assembling machine (mechanics + electronics): mid of September • Production • July: test of G1 foils and production of a fake layer (w/mylar) • end Aug: test of G2,G3, connector soldering on anode foils • September: start of Layer1 construction • October: Integration and test of vertical assembling machine • November: Layer1 assembling • December: Layer1 test

  20. Conclusion • The Cylindrical-GEMInner Tracker project has been finalized • In the last 3 years an extensive R&D program has been accomplished • full-scale Cylindrical-GEMprototype successfully tested • XV readoutdesigned and characterized in magnetic field • new single-mask GEM tested • Two planar prototypes with 300x700 mm2 foils(same dimensions for the cylindrical Inner Tracker) have been built • current mode test showed good stability, uniformity and gain • cosmic ray test with final FEE and DAQ under preparation (oct. 2010) • The first two Layers of the IT have been funded : • L2 completed by the end Nov. • then L1 production without dead time

  21. Large Area: Gain Uniformity 15800 16300 15500 15000 15600 15700 14800 15200 15500 15700 15000 14800 12 positions scanned with gamma source (~100 mm2 spot) Maximum difference (~1000) is of the same order of magnitude of the estimated single error (~800) Further test needed with more collimated source

More Related