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KLOE II Inner Tracker - FEE Status
Antonio Ranieri RD51 Collaboration Meeting Paris 13-15 October 2008
INFN-Bari
Servizio Elettronico Laboratori Frascati
GASTONE (Gem Amplifier Shaper GASTONE (Gem Amplifier Shaper Tracking ON Events) Tracking ON Events)
A prototype Front-End chip for the KLOE Inner A prototype Front-End chip for the KLOE Inner Tracker DetectorTracker Detector
On behalf of KLOE2 Bari-LNF Collaboration
KLOE II Inner Tracker - FEE Status
Antonio Ranieri RD51 Collaboration Meeting Paris 13-15 October 2008
INFN-Bari
Servizio Elettronico Laboratori FrascatiOutline
KLOE detector upgrade requirements
Inner Tracker purpose and requirements• prototype detector parameters
Readout device parameters• readout requirements & time constraints• readout data frame
Front-End Electronics development• GASTONE device description
• analog and digital blocks (main features)• GASTONE Front-End Board • prototype testing
Detector - FE integration • Input protection• RO boards - strip interconnections
Future plans and developments
Conclusions
2
KLOE II Inner Tracker - FEE Status
Antonio Ranieri RD51 Collaboration Meeting Paris 13-15 October 2008
INFN-Bari
Servizio Elettronico Laboratori Frascati
Pisa - 21/04/23
KLOE detector upgrade requirements
IT Proto 1.0 (constructed in 2007)
Triple-GEM with 3,2,2,2 gap thickness
150 mm radius (Layer 1) x 352 mm active length
Electrodes obtained joining 3 foils (450x320 mm2)
650 µm pitch (only along r)
Anode readout with 1538 strips
One-dimensional readout
128 ch equipped with GASTONE
Drift chamber
Inner Tracker
Improve vertex reconstruction of KS and decays
5 tracking layers
from 150 to 250 mm
200x500 µm spatial resolution
700 mm active length
1.5% X0 total radiation length
Technology: Cylindrical-GEM
3
KLOE II Inner Tracker - FEE Status
Antonio Ranieri RD51 Collaboration Meeting Paris 13-15 October 2008
INFN-Bari
Servizio Elettronico Laboratori Frascati
4
Inner Tracker Purpose and Requirements
Tracking device (NO charge / NO time measurements)
Low gas gain device• High sensitivity head amplifier (few fC)
High density readout (pitch 650m / 35k RO channels)• Low power FE
Most internal layer strip rate < 30 kHz• DC restorer can be avoided
Expected input charge range: 10 50 fC
Stereo strips RO• Cin spread (1 pF ÷ 50 pF)
Very light device (kapton + support structure)• R&D on detector - readout integration
KLOE II Inner Tracker - FEE Status
Antonio Ranieri RD51 Collaboration Meeting Paris 13-15 October 2008
INFN-Bari
Servizio Elettronico Laboratori Frascati
Ref GEMRef GEM
5
Detector X-ray Test validation
6 keV X-ray gun6 keV X-ray gun
CGEM in current mode
10x10cm2 GEM used as reference (normalization for pressure/temperature effects)
Gain and electron transparency measured
Uniformity measured throughout the whole CGEM surface
Prototype detector parameters
KLOE II Inner Tracker - FEE Status
Antonio Ranieri RD51 Collaboration Meeting Paris 13-15 October 2008
INFN-Bari
Servizio Elettronico Laboratori FrascatiReadout device parameters
6
Header(8+2 bits)
Trigger Counter(5bits)
Chip ID(9 Bits) Data (64 Bit)
End Byte(8 zeros)
1 bit / channel
KLOE DAQ timing“bunched” beam structure
• < 2 s (data RO)• 200 ns (input signal spread – worst case)• 96 bits to be read in < 2 s acquisition rate 100 Mbps)
1. High modularity (64 channels)2. Serial RO protocol (to reduce power consumption and cables)
a. Copper link3. RO clock only after trigger arrival (to avoid internal x-talk)4. OR output (self-trigger capability)
KLOE II Inner Tracker - FEE Status
Antonio Ranieri RD51 Collaboration Meeting Paris 13-15 October 2008
INFN-Bari
Servizio Elettronico Laboratori FrascatiGASTONE device description
Low-noise and low-power mixed analog-digital ASIC designed to satisfy IT requirements
First 16 channel prototype already tested Second 16 channel release with protection network
inside the chip will be mounted soon 64 channels proto beginning of 2009
CMOS AMS 0.35m
16 Analog channels + 2 dummy channels ~ 3.2x2.6 mm2 die complete digital section (64 chan) QFP80 package (24x16 mm2)
In 1
In 64
Pre Comp/Mon
Analog Digital
SHAPING
Tigger
Ck (RO)
CommonSignals
MASK
Common SC
signals
A/S
Pre Comp/MonA/S
Data out
Data in
Ck (SC)
Reset
Data (RO)
CONTROL
KLOE II Inner Tracker - FEE Status
Antonio Ranieri RD51 Collaboration Meeting Paris 13-15 October 2008
INFN-Bari
Servizio Elettronico Laboratori Frascati
8
Analog Section - 3 basic blocks (simulation)
a charge preamplifier to integrate the input strip current into a voltage
Internal test pulsing capability(10 fC)
1
a semi-gaussian shaper (CR-RC) circuit providing noise filtering
2
A leading-edge discriminatordesigned in fully differential mode AC-coupled with previous stage for reducing the channel to channel offset variations
3
type Pre-amplifier (cascode
configuration)
Feedback capacitor 150 fF
Feedback resistor 100 MΩ
W/L aspect ratio 500/0,5
gm 2.2 mA/V
Bias current 110 A
Pre-amplifier gain 5.6 mV/fC @ CIN=0 pF
Non linearity < 1%type Shaper (cascode
configuration)
Voltage gain 4
Non linearity < 3%
Bias current 110 A
Peaking time @ Cdet=10
50 pF
90 220 nstype Leading edge
Threshold range 0.5 200fC
Bias current 180 A
KLOE II Inner Tracker - FEE Status
Antonio Ranieri RD51 Collaboration Meeting Paris 13-15 October 2008
INFN-Bari
Servizio Elettronico Laboratori Frascati
9
Digital Section - 4 basic blocks
Discr 1 monostable
max 1 µs width
1
Discr 64 monostable
SERIALIZER
Data (RO)
TriggerCk(RO)
2
DATA RO SECTION
Data OutData In
ResetCk (SC)
CONTROLLER
DAC Vth x 4
DAC Monost.
ADC Vth x 4
ADC Monost.
3
Pulse Odd
4
Pulse EvenMask
CONTROL SECTION
KLOE II Inner Tracker - FEE Status
Antonio Ranieri RD51 Collaboration Meeting Paris 13-15 October 2008
INFN-Bari
Servizio Elettronico Laboratori FrascatiGASTONE Front-End Board
10
Main features:• 2 chips/board (16 Ch (64) up / 16 (64) down)• One serial readout line per chip• 10 LVDS communication lines/board• Clock readout signal (50 MHz)• One mask register for dead channels• OR output for 16 (64) channels for self-
triggering • HW ID for each chip• 4 DAC + 4 ADC (8 bits) to set thresholds (one
for 16 channel)• 1 DAC (8 bits) + 1 ADC (8 bits) to set
monostable output width• Default threshold value (fC) set at “power-
on”
“Slow Control” section implemented to: Set threshold value (8 bit DAC) Set the monostable pulse width Enable external pulse system Enable internal/External pulsing system Read back threshold values (8 bit ADC) Read back the value for monostable width
setting Enable channel readout through an internal
mask register
About 600 chips plus 300 VFEB including spares are foreseen to fully instrument the final detector
Dimensions: 30x95 mm2
Dimensions: 30x95 mm2
Gastone 16 chs
Input protection
circuitGEM strip
inputs
KLOE II Inner Tracker - FEE Status
Antonio Ranieri RD51 Collaboration Meeting Paris 13-15 October 2008
INFN-Bari
Servizio Elettronico Laboratori Frascati
11
Prototype testing
1. Charge sensitivity Linearity2. Uniformity among channels3. Time-walk4. ENC5. Cross-talk 6. Threshold calibration curve7. Pulse-width calibration curve (vs. Vmon voltage)8. Functional test of digital section:
a) Spi interface (write/read internal registers, DACs and ADCs) b) Data readout
Measurements:
KLOE II Inner Tracker - FEE Status
Antonio Ranieri RD51 Collaboration Meeting Paris 13-15 October 2008
INFN-Bari
Servizio Elettronico Laboratori Frascati
12
Prototype testing (II)
0
50
100
150
200
250
300
350
0 2 4 6 8 10 12
Thr
esho
ld m
V
Charge fC
Board0_ chip0
ch 0
ch 1
ch 2
ch 3
ch 4
ch 5
ch 6
ch 7
ch 8
ch 9
ch 10
ch 11
ch 12
ch 13
ch 14
ch 15
0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0,8
0,9
1
23 24 25 26 27
frequency
gain mV/fC
Gain 22 chips 352 channels
<gain> 25 mV/ fC
Charge sensitivity, linearity and uniformity
Gain sensitivity measurement
KLOE II Inner Tracker - FEE Status
Antonio Ranieri RD51 Collaboration Meeting Paris 13-15 October 2008
INFN-Bari
Servizio Elettronico Laboratori Frascati
13
0
20
40
60
80
100
120
140
160
180
200
0 5 10 15 20 25 30 35
Tim
e n
s
input charge fC
time walk soglia 161,15 mV
soglia 241,7 mV
soglia 322,3 mV
Prototype testing (III)
Different threshold values:• Th1 = 6.45 fC• Th2 = 9.67 fC• Th3 = 12.9 fC
ENC sim = 395 e + 51 e /pFENC meas = 974 e + 59 e /pF
KLOE II Inner Tracker - FEE Status
Antonio Ranieri RD51 Collaboration Meeting Paris 13-15 October 2008
INFN-Bari
Servizio Elettronico Laboratori Frascati
14
Prototype testing: summary
24 chips assembled on 12 boards have been tested performing noise and gain measurements.
Noise measurements in the final setup (i.e. boards connected to the layer 0 readout strips) show a value of 974 e- + 59 e-/pF ≈ 0.6 fC (22 pF) 1.5 fC will allow good event selection.
The measured cross talk among adjacent channels is < 1%
GASTONE parameters
Input impedance 400
Cdet range 0 ÷ 50 pF
Number of channels 16
I/O Differential and serial
Baseline restorer No
Total Gain sensitivity 25 mV/fC
Peaking time 90 ns÷200 ns (CD=0 ÷50 pF)
ENC (rms) measured on detector
974 e- + 59 e-/pF
Threshold sensing/setting 8 bits ADC/DAC (16 chs modularity)
Power consumption 0.6 mA/Ch
KLOE II Inner Tracker - FEE Status
Antonio Ranieri RD51 Collaboration Meeting Paris 13-15 October 2008
INFN-Bari
Servizio Elettronico Laboratori Frascati
15
Detector - FE Integration
Input protection & strip reference network
10 10 nF
1. Wasting space on FEB2. strip referred to GND AC-coupling
GASTONE 1’st release
GASTONE 2’nd release
1. Input protection network inside chip2. Strip DC-coupled and referred to in-MOS (500 mV )
KLOE II Inner Tracker - FEE Status
Antonio Ranieri RD51 Collaboration Meeting Paris 13-15 October 2008
INFN-Bari
Servizio Elettronico Laboratori Frascati
16
Detector - FE Integration
Front-End faraday-cageInput connections Output connections
KLOE II Inner Tracker - FEE Status
Antonio Ranieri RD51 Collaboration Meeting Paris 13-15 October 2008
INFN-Bari
Servizio Elettronico Laboratori FrascatiDetector - FE Integration: test on CGEM
GASTONE front-end board
•Written a new DAQ •Performed noise measurements on chamber allowing the measurement of the actual readout strip capacitance
diameter 300mm, active length 352 mm. (Kloe IT
Layer1) GEM size: 450x1000 mm2 (join of 3 GEM foils 450 x 333
mm2) anode readout with 1538 strips (only X coordinate)
KLOE II Inner Tracker - FEE Status
Antonio Ranieri RD51 Collaboration Meeting Paris 13-15 October 2008
INFN-Bari
Servizio Elettronico Laboratori FrascatiDetector - FE Integration: cosmic ray setup
Triple coincidence of scintillators for trigger
2 sets of drift tubes in streamer mode for tracking
Load cell for CGEM mechanical tensioning
Load cell for CGEM mechanical tensioning
2 opposite zones are equipped with FEE
2 opposite zones are equipped with FEE
18
KLOE II Inner Tracker - FEE Status
Antonio Ranieri RD51 Collaboration Meeting Paris 13-15 October 2008
INFN-Bari
Servizio Elettronico Laboratori Frascati
19
Detector - FE Integration: test at PS T9 beam
detectorselectronics rack beam line: 10 GeV pion beam
beam line: 10 GeV pion beam
128 ch w GASTONE (0.5M evts)
drift tubes in streamer mode for tracking
KLOE II Inner Tracker - FEE Status
Antonio Ranieri RD51 Collaboration Meeting Paris 13-15 October 2008
INFN-Bari
Servizio Elettronico Laboratori FrascatiDetector - FE Integration (preliminary)
(global)2 = (GEM)2 + (tracker)2
(GEM)2 = 250µm2 – 140µm2 200µm2
(global)2 = (GEM)2 + (tracker)2
(GEM)2 = 250µm2 – 140µm2 200µm2
GEM residuals with respect to the track reconstructed by the drift
tubes
GEM residuals with respect to the track reconstructed by the drift
tubes
20
GASTONEGASTONE
KLOE II Inner Tracker - FEE Status
Antonio Ranieri RD51 Collaboration Meeting Paris 13-15 October 2008
INFN-Bari
Servizio Elettronico Laboratori Frascati
2121Pisa - 21/04/23
Detector Integration (future implementation)
Study of a possible arrangement of HV-
connectors, gas inlets, mechanical support for FEE
boards
Study of a possible arrangement of HV-
connectors, gas inlets, mechanical support for FEE
boards
carbon-fiber shell
gas inlets/outlets
fiberglass FEE support
HV connector
signal connector
kapton readout circuit
FEE board
ASIC
KLOE II Inner Tracker - FEE Status
Antonio Ranieri RD51 Collaboration Meeting Paris 13-15 October 2008
INFN-Bari
Servizio Elettronico Laboratori Frascati
XV Readout Studies
Readout circuit with XV strips engraved on a single Kapton substrate
The readout prototype will be mounted on dedicated 10x10cm2 GEM detectors to study and finalize the readout of the IT
old and new ASIC releases will be used
Two ground configurations will be tested
Production of bigger planar GEM detector and tests with GASTONE will then proceed
X pitch 650 µm
V
pitch
65
0 µm
40°1000 µm
Current developments
X strips and V strips on the same plane
KLOE II Inner Tracker - FEE Status
Antonio Ranieri RD51 Collaboration Meeting Paris 13-15 October 2008
INFN-Bari
Servizio Elettronico Laboratori FrascatiConclusions
23
24 GASTONE prototypes (16 chs) have been produced and tested IT layer 0 has been instrumented with 128 chs GASTONE prototypes A GASTONE data readout system has been implemented and fully integrated with the RO SW used in cosmic ray setup and CERN test beam. Spatial resolution of CGEM layer1 prototype has been measured with GASTONE giving expected resultsThe ASIC performances fulfill the requirements
Integration of input protection network (several tests will be performed to test tolerance to discharges) Programmable test pulsing capability (0 – 50 fC)25 chips (2’nd release) have been already deliveredWe are waiting to receive the new FEBsLab tests will start soon and if successful the new FEBs will be mounted on the detector for new integration tests
Proceed with the 64 prototype (beginning of the next year)
Next steps – GASTONE Rel. 2 Next steps – GASTONE Rel. 2
AchievementsAchievements
Final steps – GASTONE Rel. 3 Final steps – GASTONE Rel. 3
KLOE II Inner Tracker - FEE Status
Antonio Ranieri RD51 Collaboration Meeting Paris 13-15 October 2008
INFN-Bari
Servizio Elettronico Laboratori FrascatiSPARE SLIDES
24
KLOE II Inner Tracker - FEE Status
Antonio Ranieri RD51 Collaboration Meeting Paris 13-15 October 2008
INFN-Bari
Servizio Elettronico Laboratori Frascati
Qth = 3.5 fC
Qth = 3.5 fC
“Smile” effect due to longer projected path of non-radial
tracks
“Smile” effect due to longer projected path of non-radial
tracks
GASTONEGASTONE
Cluster size
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