1. 19 November 2009 Christian Irmler (HEPHY Vienna) APV25 and Origami Scheme 4 th Open Meeting of the Belle II Collaboration

2. 4 th Open Meeting of the Belle II Collaboration 2Christian Irmler (HEPHY Vienna)19 November 2009 Origami Module Status Beam Test Performance Origami Cooling Hybrid Cable Length Summary & Outlook

3. 4 th Open Meeting of the Belle II Collaboration 3Christian Irmler (HEPHY Vienna)19 November 2009 Origami Module Status Beam Test Performance Origami Cooling Hybrid Cable Length Summary & Outlook

4. 4 th Open Meeting of the Belle II Collaboration 4Christian Irmler (HEPHY Vienna)19 November 2009 Belle-II SVD Layout Proposed SuperSVD geometry Central pixel double-layer using DEPFET 4 strip layers of 6” DSSDs Every sensor is read out individually to maintain high SNR –red:Origami chip-on-sensor concept –green:read out by conventional hybrid (from side) Double-layer of DEPFET pixels 4 layers of double- sided strip sensors

5. 4 th Open Meeting of the Belle II Collaboration 5Christian Irmler (HEPHY Vienna)19 November 2009 Origami Concept Total material budget: 0.6% X 0 (cf. 0.48% for conventional readout) side view Thinned readout chips (APV25) on sensor Strips of bottom side are connected by flex fanouts wrapped around the edge All readout chips are aligned  single cooling pipe Shortest possible connections  high signal-to-noise ratio

6. 4 th Open Meeting of the Belle II Collaboration 6Christian Irmler (HEPHY Vienna)19 November 2009 Status at 3rd B2GM: Sensor of first module was broken during bonding –A bug in the bonding program was identified as reason for the accident –Wrong bonding height for sensor We started to build a new Origami Module Delivery of new hybrids again delayed Thus we used the remaining hybrid of the first batch Successfully repeated assembly steps 1 to 7 as shown in B2GM in July 09 (gluing and bonding of fanouts, hybrid, APVs, …) But now the bondability of the integrated pitch adapters of the hybrid was checked in advance. Wire bonding between sensor and integrated pitch adaptor successfully performed Progress since last Belle II Meeting (July 09)

7. 4 th Open Meeting of the Belle II Collaboration 7Christian Irmler (HEPHY Vienna)19 November 2009 Module Assembly Continued Bending & Gluing of fanouts –Most complicated task? –Using positioner equipped with a custom tool –Easier than expected –Allows precise positioning w/o damaging underlying wire bonds Wire bonding between APVs and pitch adaptors Attaching cooling pipe –Thermally conductive paste –Electrically isolating pad between APV and pipe

8. 4 th Open Meeting of the Belle II Collaboration 8Christian Irmler (HEPHY Vienna)19 November 2009 Final Origami Module Top and bottom side Origami concept Prototype completed beginning of August 2009

9. 4 th Open Meeting of the Belle II Collaboration 9Christian Irmler (HEPHY Vienna)19 November 2009 Origami Module Status Beam Test Performance Origami Cooling Hybrid Cable Length Summary & Outlook

10. 4 th Open Meeting of the Belle II Collaboration 10Christian Irmler (HEPHY Vienna)19 November 2009 Beam Test Setup CERN SPS beam line Aug. 09 120 GeV π + / p / K + Cooling: 13 °C water cooling system beam Origami Module Together with other types of Belle DSSD prototype modules

11. 4 th Open Meeting of the Belle II Collaboration 11Christian Irmler (HEPHY Vienna)19 November 2009 Beam Test Results Origami Module has been tested for several hours Good performance w and w/o cooling (13 °C water) About 80 GB data recorded Analysis is in an early stage  results preliminary Benefit of cooling: ~ 10% higher SNR 120 GeV/c π + /p/K + w/o coolingcooling (13° water) p-siden-sidep-siden-side Average cluster width2.21.82.21.8 Cluster SNR11.516.712.818.5 Cluster SNR =  strip_signal / ( sqrt(cluster_width) * noise_avg) ~10% higher noise compared to 2008 beam test for all modules (ground loop in the front-end and / or HV supply?) Hence SNR of all modules is slightly worse than expected

12. 4 th Open Meeting of the Belle II Collaboration 12Christian Irmler (HEPHY Vienna)19 November 2009 Beam Test Results – Hit Time Reconstruction Time resolution achieved in beam tests with several different types of Belle DSSD prototype modules (covering a broad range of SNR) (TDC error subtracted) Origami Module SPS 2009 data matches previous beam test. 2...3 ns RMS accuracy at typical cluster SNR (15...25) Origami shows similar precision like other modules

13. 4 th Open Meeting of the Belle II Collaboration 13Christian Irmler (HEPHY Vienna)19 November 2009 Origami Module Status Beam Test Performance Origami Cooling Hybrid Cable Length Summary & Outlook

14. 4 th Open Meeting of the Belle II Collaboration 14Christian Irmler (HEPHY Vienna)19 November 2009 Origami Cooling – Intention Learned from Beam Test: –Cooling with water of 13°C  ~10% higher SNR –Temperature inside module was not measured  unknown conditions Source tests with temperature sensors mounted on the cooling pipe of the module Cool down to sub-zero temperatures –Needs flushing with dry air to avoid condensation Which SNR can be achieved?

15. 4 th Open Meeting of the Belle II Collaboration 15Christian Irmler (HEPHY Vienna)19 November 2009 3 temperature sensors on cooling pipe One sensor to measure air temperature Origami Cooling – Setup 1 liquid flow direction

16. 4 th Open Meeting of the Belle II Collaboration 16Christian Irmler (HEPHY Vienna)19 November 2009 Origami Cooling – Setup 2 air dehumidifier chiller pipes (uninsulated) Cooling liquid: water with glycol as anti- freeze protection Cooled the liquid down to -20°C Due to lack of insulation and the thin pipe, only -8.5°C could be reached at the module (first temp. sensor) Achieved liquid flow: ~1 ml/s dry air flushing connection to Origami cooling pipe

17. 4 th Open Meeting of the Belle II Collaboration 17Christian Irmler (HEPHY Vienna)19 November 2009 Origami Cooling – Results As expected significantly better SNR with cooling Relative improvement: ~ 20% @ -8.5°C Corresponds to CMS studies Some APV settings have to be adapted for low temperature operation to avoid increase of power consumption (not yet done, but recommended by Mark Raymond) Temperature at first thermal sensorCluster SNR improvement referred to warm [°C]p-siden-sidep-siden-side 67,7011,0314,61 8,7012,1517,2018%10% -8,5013,2517,7321%20%

18. 4 th Open Meeting of the Belle II Collaboration 18Christian Irmler (HEPHY Vienna)19 November 2009 Origami Module Status Beam Test Performance Origami Cooling Hybrid Cable Length Summary & Outlook

19. 4 th Open Meeting of the Belle II Collaboration 19Christian Irmler (HEPHY Vienna)19 November 2009 Intention There is only little space for DOCK boxes inside the detector 1902 APVs  ~ 10 DOCK boxes per side required Approx. twice than in SVD2  not enough space Radiation dose unknown  supposedly too high Can DOCK boxes be placed outside of the detector? Determine maximum cable length between hybrid and repeater Comparative measurements with long and short cables –long: 8.7m  longest available in lab –short: 1.8m  currently used for prototype modules

20. 4 th Open Meeting of the Belle II Collaboration 20Christian Irmler (HEPHY Vienna)19 November 2009 Cable Type CERN 04.21.21.E 3M type: 79992-25P-270A Fine pitch, twisted pair with flat region every 30 cm Halogen free

21. 4 th Open Meeting of the Belle II Collaboration 21Christian Irmler (HEPHY Vienna)19 November 2009 Pulse Shape ADC delay scan of APV25 tick mark Effect of bandwidth limitation of long cable Similar effect was observed with long CAT7 cables Solved by AD8128 equalizer chip on FADC board Can this chip also compensate the effect of the hybrid cable? Tried to adjust AD8128 parameters short (1.8m) cablelong (8.7m) cable

22. 4 th Open Meeting of the Belle II Collaboration 22Christian Irmler (HEPHY Vienna)19 November 2009 Pulse Shape with Improved Compensation Complete compensation of bandwidth effects when modified AD8128 parameters are used But now minor negative reflection of tick mark is visible Needs adjustment of cable termination on REBO pulse shape with compensation

23. 4 th Open Meeting of the Belle II Collaboration 23Christian Irmler (HEPHY Vienna)19 November 2009 Voltage Drop Hybrid equipped with 2 APVs, both enabled (bias generators turned on) Voltages measured on the hybrid Voltage drop is too high, even though APVs are working well Possible solutions: –Remote sensing  requires overvoltage protection on hybrid –Thick supply cables and a junction box close to the front-end –See following talk of Markus Friedl V_hybrid [V]V_drop [mV]I_supply [mA] +1.25V1.10150110 +2.5V 2.35150220

24. 4 th Open Meeting of the Belle II Collaboration 24Christian Irmler (HEPHY Vienna)19 November 2009 Source Measurement JP_Module (SVD2.5 sensor) equipped with 4 APVs used Only one chip was enabled (bias generators turned on) in order to reduce voltage drop Proper signal histogram Minor, but tolerable decrease of signal-to-noise ratio of about 3% Probably caused by voltage drop  comparative measurement with short cable but lowered supply voltage (run003 and run004) 1.09V and 2.38V instead of 1.25V and 2.5V, respectively Higher SNR measured w reduced LV  effects below repeat accuracy run conditionsignal [e]noise [e]clwidSNRDelta run001short, normal202749942.4912.93-3.41 run002long cable2131010862.4712.49 run003short, normal LV2023110552.512.131.75 run004short, reduced LV2037610302.5712.34

25. 4 th Open Meeting of the Belle II Collaboration 25Christian Irmler (HEPHY Vienna)19 November 2009 Cross Talk Measurement - Setup Comparison separated and bundled cables (1.8m = short) Cable of DUT is placed between the cables of two other modules Cables are stacked at all 5 flat regions Overlap = 5 x 40 mm = 200 mm

26. 4 th Open Meeting of the Belle II Collaboration 26Christian Irmler (HEPHY Vienna)19 November 2009 Cross Talk Measurement - Method Internal calibration with huge signal on the two modules which are not DUT Pulse height ~ 10 MIP Pulse generator of DUT disabled Measurement of induced signal

27. 4 th Open Meeting of the Belle II Collaboration 27Christian Irmler (HEPHY Vienna)19 November 2009 Cross Talk Measurement - Response Response of separated (left) and bundled (right) cables, respectively Observed very weak induced signal X-talk is in much lower than noise (<1 ADC count or <0.2% of pulse height)  negligible separated cablesbundled cables

28. 4 th Open Meeting of the Belle II Collaboration 28Christian Irmler (HEPHY Vienna)19 November 2009 Origami Module Status Beam Test Performance Origami Cooling Hybrid Cable Length Summary & Outlook

29. 4 th Open Meeting of the Belle II Collaboration 29Christian Irmler (HEPHY Vienna)19 November 2009 Summary & Outlook Origami Module: –Successfully built the first Origami Module Prototype –Module has shown excellent performance at the beam test –Design of 6” Origami hybrid has been started recently –We build a complete ladder of the outermost SVD layer next year Mechanics design  see talk of I. Gfall Cooling: –SNR can be improved by ~20% using liquids @ sub-zero temperatures –Thin pipe:  How can we ensure sufficient flow rate? –Common cooling system for PXD and SVD? Hybrid cables: –Cables with ~8.7m tested  tolerable SNR decrease of ~3% –No cross-talk measured –Repeater can be placed outside the detector  see talk of M. Friedl

30. 4 th Open Meeting of the Belle II Collaboration 30Christian Irmler (HEPHY Vienna)19 November 2009 Thank you for your attention

31. 4 th Open Meeting of the Belle II Collaboration 31Christian Irmler (HEPHY Vienna)19 November 2009 Backupslides

32. 4 th Open Meeting of the Belle II Collaboration 32Christian Irmler (HEPHY Vienna)19 November 2009 Calibration Curve Proper calibration curve with long cables Similar pulse shape and height

33. 4 th Open Meeting of the Belle II Collaboration 33Christian Irmler (HEPHY Vienna)19 November 2009 Pulse Shape with Compensation zoomed tick mark w/ long (8.7m) cable