1. Status of the PANDA MVD Project
Intro
Physics with the MVD
Design:
mechanics and electrics
R&D: soft and hard
(INFN-Torino)
Kai-Thomas Brinkmann, 2nd PANDA Russia Workshop, Apr 26, 2010

2. EM/hadron EM calorimeter TOF system calorimeter Dipole DIRC Cherenkov
PANDA EMC TDR (arXiv: v1)
EM calorimeter IP
driftchambers
DIRC Cherenkov
TOF system
µ counters
MVD
Solenoid
Dipole
EM/hadron
calorimeter p
RICH
central tracker
PANDA Magnets TDR
KTB PANDA Russia

3. Introduction Si detectors: Si technology: Ultimate spatial resolution
Limited energy loss information
High count rate capability
Small material budget
Si technology:
Chip design: mainstream technology
All kinds of commercial processes available
Radiation-hard designs and design tools available
Customized geometries
Integrated readout
Inherently fast readout
Digital when required
KTB PANDA Russia

4. The PANDA Micro-Vertex Detector
Design adopts state-of-the-art silicon sensor techniques
Focus on PANDA specific issues:
High and asynchronous interaction rate
Strongly asymmetric angular distributions
Versatile experimental requirements
D meson ID
Minimum mass budget
Solutions:
Heterogeneous design (pixel and strip sensors)
Very compact design
Limited number of space points / layers (default 4)
Novel readout electronics (non-triggered readout)
Tracklets real-time (fast on-line processing)
KTB PANDA Russia

5. The PANDA MVD Project Silicon pixel sensors Silicon strip sensors
Small pixel cells – 100 x 100 µm2
Specialized custom hybrid  ToPix
Features: µ technology
- ToT to retain (some) energy information
- Fast handling for high data rates
- “Untriggered” readout of data
- Rad hard within “typical” limits
- Minimum material load  sensor technology
Silicon strip sensors
Less traversed material than pixels, smaller number of channels
Features: - Pitch of 50 – 150 µm
- Double-sided sensors, 200 µm thick
- Specialized solution for front-end
KTB PANDA Russia

6. PANDA physics performance report , available as arXiv:0903.3905v1
Many open questions in strong (non-perturbative) QCD
- charmonium - hybrids, glueballs and exotics - open charm
Chiral symmetry in SU(3) and hadron mass modifications
- hadrons in the nuclear medium
Hypernuclei: “3rd dimension“ of the chart of nuclides
Electromagnetic channels and processes (generalized parton distributions, e-m formfactor of the proton in the time-like regime , virtual Compton scattering, Drell-Yan)
baryon spectroscopy, mixing/CP violation in the charm sector, rare decays, antiproton physics at low energies
KTB PANDA Russia

7. Physics with the MVD
Many open questions in strong (non-perturbative) QCD
- charmonium - hybrids, glueballs and exotics - open charm
Chiral symmetry in SU(3) and hadron mass modifications
- hadrons in the nuclear medium
Hypernuclei: “3rd dimension“ of the chart of nuclides
Electromagnetic channels and processes (generalized parton distributions, e-m formfactor of the proton in the time-like regime , virtual Compton scattering, Drell-Yan)
baryon spectroscopy, mixing/CP violation in the charm sector, rare decays, antiproton physics at low energies
KTB PANDA Russia

8. (cc) also have considerable branching ratios involving KK
Physics with the MVD
Secondary vertices from delayed decays:
D meson reconstruction D+ + K-
(cc) also have considerable branching ratios involving KK
Hyperons (e.g. (excited) Ω´s) and kaons (KS)
Heavy baryons (e.g. Λc)
Slow charged pions and kaons
KTB PANDA Russia

9. Physics with the MVD Secondary vertices from delayed decays:
D meson reconstruction
reconstructed decay length
reconstructed D mass
KTB PANDA Russia

10. Physics with the MVD ε ≈ 40% > 5∙104 events per PANDA year + K- D+
KTB PANDA Russia

11. Physics with the MVD Secondary vertices from delayed decays:
D meson reconstruction
Vertex reconstruction with very high resolution
KTB PANDA Russia

12. Physics with the MVD Secondary vertices from delayed decays: Features:
D meson reconstruction
vertex reconstruction with very high resolution
Features:
Energy loss at intermediate energies
Seeding for outer tracking
Large impact on momentum reconstruction
Elastic scattering
KTB PANDA Russia

13. Physics with the MVD Secondary vertices from delayed decays: Features:
D meson reconstruction
vertex reconstruction with very high resolution
Features:
Energy loss at intermediate energies
Seeding for outer tracking
Large impact on momentum reconstruction
KTB PANDA Russia

14. Design
KTB PANDA Russia

15. p beam hydrogen pellet or cluster jet target 10 cm 06-11-09
KTB Uppsala
10 cm

16. Technical detector layout “v1.0“ - all components specified
Design
Technical detector layout “v1.0“
- all components specified
KTB PANDA Russia

17. Design 4 barrels: 6 forward disks: - 2 inner layers: pixels
- 2 outer layers: strips
6 forward disks:
- 4 pixels
- 2 mixed disks
Pixels :
12M channels, 0.14 m2
Strips :
200k channels, 0.5 m2
KTB PANDA Russia

18. Design
Simulations
KTB PANDA Russia

19. Design Simulations         Support Silicon Components Routing
10-1 
10-2
10-3  
10-2
10-3
Silicon 
Components
10-1
10-2
10-3  
Routing   1
10-1
10-2
KTB PANDA Russia

20. Standard hybrid technology
Design: Pixels
Hybridization: Pixel module
100 μm
Standard hybrid technology
100 μm
KTB PANDA Russia

21. Pixel Readout ToPix 2.0: - Reduced scale prototype.
- Designed in CMOS 0.13 μm technology
384 pixel cells in four columns:
2 short c’s with 32 pixels
2 folded c’s with 128 pixels
Simplified end-of-column logic
16 pixels with wire bonding pads 31 32 63 95 64 96
127
128 pixel column: 12.8 mm.
Final ToPiX: - Matrix of 116x110 cells, pixel size 100x100 μm cm2 active area.
KTB PANDA Russia

22. Pixel Readout Pixel cell layout, ToPiX v3 Per cell:
Front-end amplifier
Leakage compensation
5 bit DACs (threshold tuning)
Comparator
12 bit configuration register
One register for leading edge
One register for trailing edge
In the present implementation, most of the space reserved to the analog part, but…
100 µm
70+30 μm
Analog
Digital
KTB PANDA Russia

23. Design: Strips Strip sensors trapezoidal (disk) , 70 µm, 15°
rectangular (barrel) , 130 µm, 90°
KTB PANDA Russia

24. readout along sensor sides
Design: Strips
Hybridization: Strip module readout
Disk part
Barrel part
readout along sensor sides
readout short strips
90° bend at top
pitch adapter
frontend
smd
readout long strips
KTB PANDA Russia

25. Design: Strips Strip super-module r/o and cooling Barrel part
Disk part
Barrel part
Support
Cooling
KTB PANDA Russia

26. Design: Mechanics Light-carbon support structures
Overall integration concept
Tests and prototypes
KTB PANDA Russia

27. Mechanics Detector support Simulation of end rings and cross frame
asymmetric displacement safety factor of 2 included
Cross Frame
KTB PANDA Russia

28. gluing: 2 foam disks w/t embedded cooling pipes
Mechanics
Cooling concept
- Coolant: water (18°C)
- Under-pressure mode using hydrostatic pressure
CAD
disk layer
carbon foam cutting
drilling and baking
gluing: 2 foam disks w/t embedded cooling pipes
KTB PANDA Russia

29. Hardware Low-mass cables - Al cables on thin dielectric
High-bandwidth data transmission
1m prototypes under study
1.2 mil Al
5.1 mil PA
0.6 mil Al
KTB PANDA Russia

30. Strip Sensor Tests Setup of a tracking station Add‘l tests:
ELSA electron beam,
3.2 GeV
KTB PANDA Russia

31. Strip Sensor Readout
Development of a fast readout chain with data manipulation capacity
KTB PANDA Russia

32. Strip Sensor Readout PANDA readout schematics
Several frontends on one link depending on occupancy
EoC reads up to 4 (8) FE chains, reduces amount of data (clustering, priority matching) and buffers
- Multiplexed output sends data optically
KTB PANDA Russia

33. Strip Sensor Readout
Free-running frontend for Si strips: solution in the works
Development of self triggered frontend @ GSI based on existing n-XYTER
Free-running autonomous hit detection
Bandwidth-focussing token ring readout
KTB PANDA Russia

34. Summary The MVD concept:
needs continued R&D.
has to undergo add‘l iterations with simulation.
has reached a technical level.
meets the design specifications.
R&D as well as the realization of the micro- vertex detector needs expert manpower.
KTB PANDA Russia

35.
KTB PANDA Russia