Status of the Status of the Cylindrical‐GEM Cylindrical‐GEM project for the project for the KLOE‐2 Inner Tracker KLOE‐2 Inner Tracker Danilo Domenici (INFN-LNF) Danilo Domenici (INFN-LNF) on behalf of the KLOE-2 collaboration on behalf of the KLOE-2 collaboration Villa Olmo, Como – 6 Villa Olmo, Como – 6 th th October 2009 October 2009
18
Embed
Status of the Cylindrical‐GEM project for the KLOE‐2 Inner Tracker Danilo Domenici (INFN-LNF) on behalf of the KLOE-2 collaboration Villa Olmo, Como –
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Status of the Cylindrical GEM ‐Status of the Cylindrical GEM ‐project for theproject for the
KLOE 2 Inner Tracker‐KLOE 2 Inner Tracker‐
Danilo Domenici (INFN-LNF)Danilo Domenici (INFN-LNF)on behalf of the KLOE-2 collaborationon behalf of the KLOE-2 collaboration
Villa Olmo, Como – 6Villa Olmo, Como – 6thth October 2009 October 2009
KLOE-2 Highlights
21/04/23 Villa Olmo, Como D. Domenici - LNF 2
KLOE-2 is going to continue and improve the KLOE physics program at the upgraded DaΦne machine with a focus on KS η and η’ rare decays, neutral kaon interferometry, lepton universality test and γγ physics
End of 2009: roll-in of KLOE for 1 year of data-taking
Spring 2011: upgrade of KLOE with new Calorimeters (QCALT, CCAL, HET) and a new Inner Tracker based on the GEM technology for a 2-3 years of data-taking
The project has been approved and funded by INFN
Other 4 talks presented in this Conference (Gonnella, Schioppa, Miscetti, Martini)
The KLOE Detector
21/04/23 Villa Olmo, Como D. Domenici - LNF 3
Multi-purpose detector optimized for KL physics
Huge, transparent Drift Chamber
in 5.2 kGauss field of a SC coil
Carbon fiber walls, 55000 stereo wires,
2 m radius, 4 m long, He/CO2 gas mixture
Momentum resolution: σ(pT)/pT ~ 0.4%
Pb-Scintillating Fiber Calorimeter with excellent timing performance
24 barrel modules, 4 m long and C-shaped End-Caps for 98% solid angle coverage
Time resolution: σT = 54 ps / √E(GeV) 50 ps⊕
Energy resolution: σE/E = 5.7% / √E(GeV)
Drift ChamberDrift Chamber CalorimeterCalorimeter
Need for an Inner Tracker
21/04/23 Villa Olmo, Como D. Domenici - LNF 4
Simulation results for a π track from KS → ππSimulation results for a π track from KS → ππ
Δx @pca
Δz @pca
Δpx @pca
Δx @vertex
IT 0.6 mm 0.9 mm 1.2 MeV/c 1.9 mm
No IT 1.7 mm 2.2 mm 1.6
MeV/c 4.9 mm
Sensitivity on CPT violation parameters on K0 interference
(αβγ)
Sensitivity on CPT violation parameters on K0 interference
(αβγ)
KLOE measurement (σΔt = τs)
KLOE-2 prevision (σΔt = 0.25 τs)
Factor of 10 improvement of present error feasible with 20 fb-1
(100 fb-1 needed witout IT)
The Inner Tracker
21/04/23 Villa Olmo, Como D. Domenici - LNF 5
IT to be inserted inside KLOE Inner radius 127 mm (20 τs) to
preserve KL-Ks interference region Outer radius 215 mm to safely
install inside the DC
IT to be inserted inside KLOE Inner radius 127 mm (20 τs) to
preserve KL-Ks interference region Outer radius 215 mm to safely
install inside the DC
Inner Tracker Numbers
21/04/23 Villa Olmo, Como D. Domenici - LNF 6
5 independent tracking layers
σrφ = 200 µm and σZ = 500 µm spatial resolutions with XV strips-pads readout
700 mm active length
1.5% X0 total radiation length in the active region with Carbon Fiber supports
Realized with fully Cylindrical-GEM
detectors
Realized with fully Cylindrical-GEM
detectors
The Cylindrical-GEM
21/04/23 Villa Olmo, Como D. Domenici - LNF 7
Conversion & Drift
Transfer 1
Transfer 2
Induction
Cathode
GEM 1
GEM 2
GEM 3
Anode
Read-out
3 mm
2 mm
2 mm
2 mm
Gas Electron Multiplier (F. Sauli, CERN, 1997)Thin (50 μm) metal coated kapton foil, perforated by a high
density of holes (70 μm diameter, 140 μm pitch)With 400 V between the two copper sides, a 100 kV/cm electric field is produced into the holes acting as multiplication channels
for electrons produced in the gas by a ionizing particle
Triple-GEM
3 mm
2 mm
2 mm
2 mm
Cathode
GEM 1
GEM 2
GEM 3
Anode
Read-out
Cylindrical Triple-GEM
C-GEM Prototype150 mm radius (Layer 1) x 352 mm active length
1538 strips with 650 µm pitch only along Z
C-GEM Prototype150 mm radius (Layer 1) x 352 mm active length
1538 strips with 650 µm pitch only along Z
Manufacturing the Prototype
21/04/23 Villa Olmo, Como D. Domenici - LNF 8
1
352 mm
960 mm
Full sensitiveUltra-light detector
Full sensitiveUltra-light detector
Large GEM foilLarge GEM foil Vacuum bagVacuum bag
Cylindrical GEMCylindrical GEM
Cylindrical cathodeCylindrical cathode
The GASTONE ASIC
21/04/23 Villa Olmo, Como D. Domenici - LNF 9
Dedicated FEE chip for the KLOE-2 Inner Tracker Low power consumption and high integration requirements 4 different blocks:
• charge sensitive preamplifier• shaper• leading-edge discriminator (with programmable thr.)• monostable to stretch the digital signal for trigger
Sensitivity (pF) 20 mV/fC
ZIN 400 Ω (low frequency)
CDET 1 – 50 pF
Peaking time 90 – 200 ns (1 -50 pF)
Noise (erms) 974 e- + 59 e-/pF
Baseline restorer yes*
Channels/chip 64*
Readout LVDS/Serial
Power consum. ≈ 0.6 mA/ch
GASTONE board ver.1GASTONE board ver.1
C-GEM Prototype Performance
21/04/23 Villa Olmo, Como D. Domenici - LNF 10
Performance measured at PS testbeam with GASTONE digital Readout Electronics and external Drift Tubes Tracking System