Planar-GEM Trackers Bernd Voss Helmholtzzentrum für Schwerionenforschung GmbH (GSI)
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Transcript of Planar-GEM Trackers Bernd Voss Helmholtzzentrum für Schwerionenforschung GmbH (GSI)
Planar-GEM Trackers
Bernd VossHelmholtzzentrum für Schwerionenforschung GmbH (GSI)
2Planar-GEM Forward Trackers PAND -FE-DAQ Workshop April, 23rd 2009B. Voss et. al.
Outline
Basic assumptions Task & Set up
Internal structure Basic design & Detector assembly
Simulations Particle flux & Tracks
PadPlane Design & Consequences
Front End Electronic The XYTER Family
Higher Level Readout SysCore / Exploder
First Results Noise figures
The Future FAIR-XYTER
3Planar-GEM Forward Trackers PAND -FE-DAQ Workshop April, 23rd 2009B. Voss et. al.
Figure of Merit: Momentum resolution dp/p(p,θ,z,r)
• particle momentum p• scattering angle θ• vertex coordinates z, r
Basic assumptions: 3..4 GEM-Tracker stations
GEM-TPC ‘short’ version? (1,5 m 1,2 m)
Maximize shape-conformity
Full angular (phi) coverage not possible
Radiation hardness 100krad
Planar GEM-Trackers Basic assumptions
Target spectrometer@PANDA ‘V833’
4Planar-GEM Forward Trackers PAND -FE-DAQ Workshop April, 23rd 2009B. Voss et. al.
Planar GEM-Trackers Acceptance
Longitudinal positions: 810,1170,1530,1890 mm
Diameters: Ø900,900,1120,1480 mm
Inner bore: Ø50..100 mm
Active area: 0,6..1,7 m2
Angular range: ~ 5..18° (2..26)°
Material budget (active area): ~ 0.5% X0 (per GEM station)
Position resolution: < 0.1 mm
Double track resolution: 10 mm, 5° Target spectrometer@PANDA ‘V833’
Still discussing where to but the detectors Preliminary: Low B-field region, low curvature tracks
5Planar-GEM Forward Trackers PAND -FE-DAQ Workshop April, 23rd 2009B. Voss et. al.
Planar GEM-Trackers Detector assembly
Window
Drift electrode
GEM stackPad Plane
Support &
Media-Distribution
Cooling Support &
LV- Distribution
Front-End Electronic
Shielding Cover
& Read-out
Plane
Possible cabling hooks: central bar & circumference
6Planar-GEM Forward Trackers PAND -FE-DAQ Workshop April, 23rd 2009B. Voss et. al.
Hit Rate Simulation assumptions
Assumptions:! 4 GEM stations
! 4 projections per station (4 coordinates, 2 tracklets per detector)
Ar/CO2 tcoll=nx10ns
Standard physics run 2·107 annihilations / s
7Planar-GEM Forward Trackers PAND -FE-DAQ Workshop April, 23rd 2009B. Voss et. al.
GEM-Trackers Simulation results@15GeV/c
Ralf Kliemt
(TU-Dresden)
Radoslaw Karabowicz
(GSI)
Mean 1,5 mm
Structure size
Inner | Outer area…
Beam pipe…
Mean 0,15 °
8Planar-GEM Forward Trackers PAND -FE-DAQ Workshop April, 23rd 2009B. Voss et. al.
PadPlane Basic design concepts
Simulation results: HIT-rate 5..50(140)k particles/cm2/s (r)
Track lengths: radial 0,5..8 mm (mean 1,3..1,6 mm) angular 0..0,8° (mean 0,15°)
Cluster sizes <1mm (single-cluster HIT to be avoided)
Purely resolution driven
Patterning structure under investigation
1. Strips
1. Circular/polar + Radial
2. Cartesian
2. Pixels – regular polygon shapes
3. Hybrid readout structures
9Planar-GEM Forward Trackers PAND -FE-DAQ Workshop April, 23rd 2009B. Voss et. al.
PadPlane Pattern ‘concentric’
Assumed in simulations: 1571,1571,1571
Required for constant resolution: 5888, 9600,13440
Problems with Patching (GEM4)
Patching process
Signal routing Dead areas
Increased material budget
Support
Additional routing layers
10Planar-GEM Forward Trackers PAND -FE-DAQ Workshop April, 23rd 2009B. Voss et. al.
PadPlane Pattern ‘radial’
Assumed in simulations: 1571,1571,1571
Required for constant resolution: 5888, 9600,13440
Problems Patching (GEM4)
Cut channels (iso-centric)
non-uniformity
iso-centric
acentric
11Planar-GEM Forward Trackers PAND -FE-DAQ Workshop April, 23rd 2009B. Voss et. al.
PadPlane Pattern 60° ‘tilted’
Assumed in simulations: 2096,2096,2096
Required for constant resolution: 5888, 9600,13440
Problems Patching (GEM4)
Cut channels Unequal length non-uniformity
13Planar-GEM Forward Trackers PAND -FE-DAQ Workshop April, 23rd 2009B. Voss et. al.
PadPlanes (3..4 GEM-Ts)
FEE system ‘Division bar’ not sufficient nor feasible Circumferential
arrangement FEE-Ring width ≤ 50 mm ≈ 7..11% of total detector area
(n-)XYTER-based FEB cards 180..900 cards (2 ASICs à 128 channels each, 100x65mm2)
overall operating power 21 mW/channel 2,7 W/chip ! ≈ 1..5 kW power/cooling requirements, Axial cooling structure,
≈ 30% of weight
Front-End Electronic General ideas
Structure size Resolution evolution Channel no.
0,3..0.5 mmdecreasing 20..26 kch
constant 96..116 kch
1 mm constant 80..95 Kch
16Planar-GEM Forward Trackers PAND -FE-DAQ Workshop April, 23rd 2009B. Voss et. al.
Front-End Electronics (n-)XYTER
• AMS CMOS 0.35 m technology
• 128 channels / chip
• Charge-sensitive preamp• Fast (30ns)& Slow (150ns) Shaper• Peak detector
• Time-stamping with 1 ns resolution
• Data driven, autonomous hit detection
• Token ring readout @ 32 MHz
de-randomizing, sparcifying • expected noise:
370 e-@10pF, 550e-@20pF
17Planar-GEM Forward Trackers PAND -FE-DAQ Workshop April, 23rd 2009B. Voss et. al.
Front-End Electronics XYTER testing board
Simple hybrid PCB with signal fan-in
ADC
interconnect to DAQ chain (SysCore,Exploder)
CBM beam time September 2008: whole signal chain operative
‘Chip-In-Board’ avoids space eating vias
allows pitch adaptation: 50,7 μm on chip
101,4 μm on PCB (two levels)
10 Rev. C boards, fully functional
18Planar-GEM Forward Trackers PAND -FE-DAQ Workshop April, 23rd 2009B. Voss et. al.
Front-End Electronics XYTER TPC Prototype board
42 4-layer PCBs for PANDA TPC prototype
2 XYTER chips / card chip-in board glued to aluminium backing step-down & staggered bonding
2 x 128 channels / card 300 pins / connector
~350 Watt power dissipation passive heat pipe system cooling liquid HFE-7100 (3M)
PCB lab-tested awaiting in-beam test (@CB-ELSA)
Higher integration level (1:1): SysCore Boards (KIP Heidelberg) Exploder+… (GSI-EE, MBS) Others …?
2 XYTERsADC
Power regulators
Gold plated edges
20Planar-GEM Forward Trackers PAND -FE-DAQ Workshop April, 23rd 2009B. Voss et. al.
System Integration Issue Global Timing
SysCore generates 48 to 64 bit data elements: n-XYTER provides
14 bit time stamp @ 1ns resolution 7 bit channel number
FEB provides 10 bit peak height
SysCore adds chip number epoch counter some diagnostic
SysCore provides data FIFO
The serialized event number with successive time stamp could be fed into auxiliary inputs.
This event header would be added to the data elements Such synch scheme should be fine up to about 50 kHz event rate
Relate local time stamps to global events:Feed a global epoch marker or event strobe into SysCore
21Planar-GEM Forward Trackers PAND -FE-DAQ Workshop April, 23rd 2009B. Voss et. al.
Test Setup Complex Multi-layer Data Chain
Detector n-XYTER-FEB
n-XYTER FEB and Bonding Technology Documentation (Manual)
ADC Interconnect SysCore / Exploder
Firmware Embedded software Soft configuration
Ethernet-Interconnect PC and DAQ
KNUT GUI DAQ System
Ongoing:
Realize software design freeze to be packaged
Still missing:
Diagnostic toolbox for system analysis to make successful deployment in other labs feasible
22Planar-GEM Forward Trackers PAND -FE-DAQ Workshop April, 23rd 2009B. Voss et. al.
Experimental data Energy-Output (preliminary)
Si Detector 300μm strip-pitch
DC coupled
40V
Pulse-height spectra on one strip ‘as is, on the table’
Enhanced low-energy part: -electrons & other scattering
Sr90
Energy [ADC digits]
Am241 60keV ~2/3 MIP
Photo escape? Pedestal ?
23Planar-GEM Forward Trackers PAND -FE-DAQ Workshop April, 23rd 2009B. Voss et. al.
Experimental data Energy-Output (preliminary)
Pulse-height spectra with internal test pulse
Cdet not determined (5-10 pF)
Peak-to-peak distance ~5560e-
FWHM ~1000e-, σ ~425e- (370e-expected)
2780e- (CAL = 10)
Analog read out chain operative
Temperature coefficient spoils the effort
Sr90
Energy [ADC digits]
Am241 60keV ~2/3 MIP
Pedestal ?Photo escape?
24Planar-GEM Forward Trackers PAND -FE-DAQ Workshop April, 23rd 2009B. Voss et. al.
n-XYTER Engineering Run
Preparations by Hans Kristian Soltveit (Physikalisches Institut Heidelberg)
Several thousand chips@110k€
Issues addressed: Temperature coefficients on three amplifiers
Pad arrangement, input-ESD-pads, LVDS in/out arrangements
Shielding (in particular mono stable cross-talk)
Choice of process
Epoch marker output
Time line (03/2009): Current: Extensive corner analysis on new schematics
Until end of April: finalize schematics & Review on modifications
May & June: Layout modifications
End of June: Submission readiness review and successively submission to AMS
25Planar-GEM Forward Trackers PAND -FE-DAQ Workshop April, 23rd 2009B. Voss et. al.
The Future: FAIR-XYTER …for gaseous detectors
GEM-Tracker GEM-TPC Others
Channels/chip 32-128 64-128
Power limit/channel 10mW
Noise limit 500e@5pF 500e@5pF, 900e@25pF
Max. rad dose 100 krad
Avg. det. capacity 7 pF7..150 pF
Max. det. capacity 2...150 pF 7 pF
Rate/channel 4..11/200kHz 250 kHz 250 kHz
Ampl. 94 ke 25 ke above 25 ke
Signal distribution Landau
Measured feature Spatial resolution + Hit-time
Signal shape 30..40ns
Max. possible signal 200ke = average*2 750ke=average*30 1000ke, 3000ke, Dual range
ADC res./ampl. 7 bit, 5 ke 8-9 bit linear, 4 ke
Time resolution 10ns/hit 4ns/hit 4ns
Special tasks Spark protection + baseline restoration +forced neighbor readout
26Planar-GEM Forward Trackers PAND -FE-DAQ Workshop April, 23rd 2009B. Voss et. al.
Detector Control & Monitoring Structure
Current concept: Modular, expandable, flexible
Same structure for all GEM-Detectors
Hierarchical interlocking
Failsafe operation
Hard- & software limits
Integration into PANDA-DCS database started Identified 45 parameters so far
GEM-Projects: TPC1 & Tracker2 GSI crew-members & tasks
Jörg Hehner1 Aging tests Andreas Heinz1 PadPlane, GEMs, sensors, WebInfoMarkus Henske1 Material tests, sensors, infrastructure, purchaseRadoslaw Karabowicz2 Root-SimulationsVolker Kleipa1 Front-End Electronics (XYTER)
Jochen Kunkel1,2 Mechanics, drawings, simulations, assemblyRafal Lalik1 Front-End Electronics (XYTER)Christian Schmidt1 Front-End Electronics (XYTER)
Sandra Schwab1 Part production, tooling , FOPI environmentDaniel Soyk1 FEM-Simulations
Eduard Traut1 GEM generals Ufuk Tuey1 General mechanics, drawings Bernd Voss1,2 ‚All & nothing‘, ideas & concepts, project & logisticsJan Voss1 General mechanics, material testsJoachim Weinert1 Part production, tooling
Backup slides
29Planar-GEM Forward Trackers PAND -FE-DAQ Workshop April, 23rd 2009B. Voss et. al.
Benchmark channels
ChannelFinal state
Related to
Arguments / Aimspp pA MVD CT FT
(n)π+π- (n)π+π- X
ψ(3770) D+ D-
2K 4π
X XSecondary vertex tagging capability
Special consideration of the slow π coming from the D* decays
K, π tracking and momentum measurement ψ(4040) D*+D*- X X
ΛΛ pπ-pπ+- X X X Λ reconstruction, partly only with CT (~15%) tests vertexing capabilities of CT
Incorporates also cascade decays outside MVD ΞΞ pp 4π X X X
ηc ΦΦ 4K X PID studies and V0 reconstruction with CT
J/ΨX 2l X X X
High pT lepton tracks in multi-track environment CT important for momentum measurement nd tracking
pp pp X X Ximportant for FT background studies for CT and MVD
32Planar-GEM Forward Trackers PAND -FE-DAQ Workshop April, 23rd 2009B. Voss et. al.
n-XYTER Architecture as Realized and Under Test Today
33Planar-GEM Forward Trackers PAND -FE-DAQ Workshop April, 23rd 2009B. Voss et. al.
Cooling Motivation Simulations
Backside view Parameters:
NXYTER(2) + ADC + voltage regulators on board
FR4 + Alu backing, single sided mounting
10°C cooling media temperature
25°C backflow temperature
Results: Chips reasonably cool
34Planar-GEM Forward Trackers PAND -FE-DAQ Workshop April, 23rd 2009B. Voss et. al.
Analogue Pulses, Peaking Time, Front-End Noise
FAST channel SLOW channel
ENC26.9 e/pF + 200 e
12.7 e/pF + 233 epeaking
timea (1% to 99%)
18.5 ns 139 ns
Engineered for 30 pF, giving 1000 e 600 e
power consumption: 12.8 mW per channel; OK for neutrons!
35Planar-GEM Forward Trackers PAND -FE-DAQ Workshop April, 23rd 2009B. Voss et. al.
Context FP7 JRA ‘JointGEM’ Projects
Name … prototype detector systems of … …as planned for…
P-1 TPC-GEM… a high-rate Time Projection Chamber
(TPC) with GEM readoutInner tracker of
PANDA@FAIR
P-2 Cylindrical-GEM… a multilayer self-supporting cylindrical
GEM (C-GEM) structureAMADEUS & KLOE2
P-3Large-Area Planar-GEM
… large-area planar GEM detectors capable of withstanding
very high beam rates
Forward tracking system of PANDA@FAIR and for the muon system
of CBM@FAIR