J.M. Heuser CBM Silicon Tracking and Vertex Detection System 1 Development of a Silicon Development of a Silicon Tracking and Vertex Tracking and Vertex Detection System Detection System for the CBM Experiment at for the CBM Experiment at FAIR FAIR Johann M. Heuser, GSI Darmstadt, Germany for the CBM Collaboration VERTEX 2006, Perugia, Italy, September 2006 The international F Facility for A Antiproton and I Ion R Research The C Compressed B Baryonic M Matter experiment The Silicon Tracking and Vertex Detection System: Performance requirements, Detector concept, R&D activities
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J.M. Heuser CBM Silicon Tracking and Vertex Detection System 1
Development of a Silicon Tracking Development of a Silicon Tracking and Vertex Detection System and Vertex Detection System
for the CBM Experiment at FAIRfor the CBM Experiment at FAIR Johann M. Heuser, GSI Darmstadt, Germany
for the CBM Collaboration
VERTEX 2006, Perugia, Italy, September 2006
The international FFacility for AAntiproton and IIon RResearch
Russia:IHEP ProtvinoINR TroitzkITEP MoscowKRI, St. PetersburgKurchatov Inst., MoscowLHE, JINR DubnaLPP, JINR DubnaLIT, JINR DubnaMEPHI MoscowObninsk State Univ.PNPI GatchinaSINP, Moscow State Univ. St. Petersburg Polytec. U.
Ukraine: Shevshenko Univ. , Kiev
* to be approved by CB
> 40 institutions
> 350 Members
open for new partners!
J.M. Heuser CBM Silicon Tracking and Vertex Detection System 7
The CBM ExperimentThe CBM Experiment tracking, momentum, vertex reconstruction:
silicon pixel/strip detectors (STS) in magnetic dipole field
electron ID: RICH & TRD (& ECAL) suppression 104
hadron ID: TOF (& RICH)
photons, 0, ID: ECAL
event characterization (PSD)
high speed DAQ, only high-level triggers
not necessarily fixed layout!
more like „facility“
J.M. Heuser CBM Silicon Tracking and Vertex Detection System 8
Alternative CBM setup: Alternative CBM setup: DimuonsDimuons Dimuon setup studied with
active muon absorbers (Fe + C + detector layers) after the Silicon Tracker
... move absorbers out for hadron runs.
J.M. Heuser CBM Silicon Tracking and Vertex Detection System 9
Challenge: Au+Au collisions, 25 GeV/n:
high track densities:
600 charged particles in 25o
high r/o speed, radiation hardness: 10 MHz interaction rate (109 ions/s on 1% int target), only high-level triggers.
Tasks:
track reconstruction for particles with 0.1 GeV/c < p 10-12 GeV/c , momentum resolution ~ 1% at 1 GeV/c,large lateral coverage
primary and secondary vertex reconstruction (resolution 50 m)
V0 track pattern recognition (low-mass vector mesons lepton pairs, open charm decays, hyperons, e+e- pairs from -conversion)
D+ → ++K- (c = 317 m)
D0 → K-+ (c = 124 m)
Silicon Tracking and VertexingSilicon Tracking and Vertexing
J.M. Heuser CBM Silicon Tracking and Vertex Detection System 10
Vertexing: "VTS"
2 (3) MAPS stations. z = (5), 10, 20 cm 150 µm Si In vacuum. No layout yet.
Tracking: "STS"
2 HYBRID Pixel stations: z = 30, 40 cm 750 µm Si No layout yet.
4 Micro-STRIPS stations: z = 50, 60, 75, 100 cm 400 µm Si Detailed station layout.Detailed station layout.
blue: double metal connections of strips in regions I to III
n side: "vertical" strips
III
LY
LX
r/o direction
r/o directionI II
J.M. Heuser CBM Silicon Tracking and Vertex Detection System 21
R&D with CIS Erfurt, Germany:R&D with CIS Erfurt, Germany: (http://www.cismst.de/english/frameset.html)
CBM: Opportunity to participate in reseach CBM: Opportunity to participate in reseach project of CIS (focus on rad hard detectors). project of CIS (focus on rad hard detectors).
CBM sensor prototypes as "test objects".
Sensor design: finished 10/2006.End 2006: batch of ~ 20+ wafers.End 2006: batch of ~ 20+ wafers.
Plenty of sensors for a variety of tests of r/o electronics and detector concept.
Set up Silicon labs at GSI + other institutes. Test beam + telescope at GSI.
256 x 256 strips80 µm pitch90 deg stereo angle256 x 256 strips
50 µm pitch90 deg stereo angle
1024 x 1024 strips50 µm pitch15 deg stereo angle
4" wafer, 280 µm thick
design finished
design finished
design partlyfinished
J.M. Heuser CBM Silicon Tracking and Vertex Detection System 22
Microstrip Detector ReadoutMicrostrip Detector ReadoutTwo streams of activities:
1) In the CBM Collaboration (MEPhi/MSU, Moscow): R&D on fast self-triggered low-power electronics blocks
2) Exploration of the NXYTER chip in collaboration with the Consortium
DETectors for Neutron Imaging http://jra1.neutron-eu.net/jra1 dual polarity input pitch: 50.7 µm 128 channels per chip amplitude measurement data driven token-ring r/o architecture count rates: ~160 kHz/strip charge collection 30 ns peaking time small (~2 ns) timing jitter thresholds: > 2700 e dynamic range: different for +/- power: ~ 13 mW/channel (high!!!) produced in 0.35 m CMOS
Specs very similar to the CBM needs!1st chip submission in March 2006.
Aim: Test and modify this chip. Construction of a demonstrator microstrip detector module for CBM.
Close ties to the project through Head of GSI Detector Lab
GSI: significant participation in funding of chip submission (Summer 2006).
J.M. Heuser CBM Silicon Tracking and Vertex Detection System 23
N-XYTER Submitted via CMP N-XYTER Submitted via CMP Dies Expected Sept. 25Dies Expected Sept. 25thth 2006 2006
128 analoginputs
poisson distributedat 32 MHz
total average
input rate
8 LVDSoutput lines
at 4 x 32MHz:time stamp, channel no.
+ 1 differential,
analog output
AMS CMOS 0.35µ with thick metal four
J.M. Heuser CBM Silicon Tracking and Vertex Detection System 24
Study on Mechanical Structure Study on Mechanical Structure Elements (microstrip module): Elements (microstrip module):
module
sensor holders
flat cable routing
2-module structure, building block of detector stations
Study together with ITEP Moscow:
Based on ALICE ITS studies, and CBM STS layout concept.Carbon fibre.
"very preliminary,
brain-storming
designs"
J.M. Heuser CBM Silicon Tracking and Vertex Detection System 25
R&D together with IPHC (IReS) Strasbourg development of fast column//architecture development of radiation tolerant sensors
(from some 1012 to 1013 neq /cm2)
longer lifetime of first MAPS station: enlarge distance from target: 5 cm → 10 cm
Hybrid pixels:
at least for now:
- too thick- too large pixels
- power dissipation requires cooling.
SOI pixels:
in a small process: interesting!
MAPS with depletion layer:
sounds interesting!
J.M. Heuser CBM Silicon Tracking and Vertex Detection System 26
R&D goals with MAPS: R&D goals with MAPS: Radiation tolerance & readout speedRadiation tolerance & readout speed
R&D goals with MAPS:
radiation tolerance: ~1012 1013 1 MeV nequiv.
readout time: 10 sec, column parallel r/o
Expected situation in CBM:
Fluence at 1st MAPS station:
~10 1-MeV nequiv. per event
detector partly destroyed after 1012 reactions corresponds to 105 D mesons detected (already decent measurement!)
Possible running conditions:
a) 1 day detector lifetime at 107 reactions/s, 100 events piled up, or
b) 4 month detector lifetime at 105 reactions/s, no pile-up events.
URQMD, Au+Au 25 GeV/nucleon
Fluence of 1 MeV nequiv./cm2 in 1st MAPS station at z = 5cm
Kpn
What about retracting the 1st MAPS station from the target?
J.M. Heuser CBM Silicon Tracking and Vertex Detection System 27
realistic tracking in magnetic field, 2 MAPS, 2 Hybrid pixel, 4 Strip stations proton identification required
Benchmark for SVT and STS Performance: Benchmark for SVT and STS Performance: DD00 mesons, Au+Au collisions at 25 AGeV mesons, Au+Au collisions at 25 AGeV
D0 production cross section from HSD 25 AGeV Au+Au from UrQMD
minimum bias collisions
1st MAPS station at z = 5 cm
D0
S/B = 3.5
1st MAPS station at z = 10 cm
dose × ¼
S/B × ¼
no gain!!
J.M. Heuser CBM Silicon Tracking and Vertex Detection System 28
Summary - CBMSummary - CBMCBM is a baseline experiment at FAIR. Running from 2014/15.
CBM offers very interesting physics program on the QCD phase diagram.
Unique features expected in CBM energy range: First order phase transition, critical point
As a 2nd generation experiment, CBM will be able to study: rare probes, fluctuations and correlations!
Detector development under way
Increasingly realistic feasibility studies are performed
→ Technical Proposal in ~2007.
J.M. Heuser CBM Silicon Tracking and Vertex Detection System 29
The Silicon Tracking and Vertex Detection System is the core of CBM.