Resistive bulks industrialization S tatus report

1. ResistivebulksindustrializationStatus report Fabien Jeanneau 2 october 2012 RD51 Collaboration meeting | Stony Brook University | October 2012

2. Industrialization for the nsw • Goal (seetalk by Joerg Wotschack in WG1) • Large resistive detectors (bulk?) of 0.5x1 m2for end-2012/begin-2013 • During 2013: technical adaptation (investment in machines) for a width of 1 m to achieve areas of 1 x 2 m2 • Production during 2014/2015 • Road map (NSW milestones) • July 2012: delivery of BXY 10x10 cm2and tests (CERN/Saclay) • End 2012: towards large areas (0,5x1 m2)  replacement of MBTS on ATLAS (48 to 96 chambres of 0,6x0,8 m2)?  Geoazurproject (P. Salin) • 2013/2014: towards nominal areas (1 x 2 m2) • Industrialpartners • ELVIA / CIREA (France), ELTOS (Italy), Triangle Labs (Nevada, US) RD51 Collaboration meeting | Stony Brook University | October 2012

3. Elvia / ceapartnership • Common fundingssince one year (ANR) to develop large area detectors protectedagainstsparks (SPLAM) • COMPASS: large pixel MM detector withburiedresistors (see the talk by Damien Neyret and Florian Thibault, WG2) • CLAS12: large bulk on thinpcb (resistive solution alsostudied for the forward) • Other PCB studies PLV bulks RD51 Collaboration meeting | Stony Brook University | October 2012

4. first step: smallbulk XY Bulk Mesh • Use of alreadyexistinglayout • Resistivebulk (50 to 100 Mohmsalong the strips) • X-Y readout • Active area: 10 x 10 cm 2 • Geometry: • strip pitch 250 µm • stripwidth 150 µm 128 um RD51 Collaboration meeting | Stony Brook University | October 2012 Coverlay Y readout FR-4 Xreadout

5. BXY1 : First batch (july 2012) • Visit to CIREA (Cholet) in order to make the voltage tests • The visual inspection shows waves on the mesh • Diagnostic: the meshis not stretch enough • 3 detectors are deliveredat the beginning of July • Measurements in gasgive55Fe spectrumwithlowenergyresolution and evidence of an inhomogenous amplification gap (due to stretching) RD51 Collaboration meeting | Stony Brook University | October 2012

6. BXy1 : resistivitymeasurements by ELVIA / cirea Measurementdevice: Megger MIT 420 MOhms MOhms average #1 #2 One measureevery 10 strips MOhms MOhms #3 #4 RD51 Collaboration meeting | Stony Brook University | October 2012

7. Bxy1 : stretching of the mesh Microscope measurements ~ 1 ° RD51 Collaboration meeting | Stony Brook University | October 2012

8. Bxy1 : voltage measurements by elvia / cirea RD51 Collaboration meeting | Stony Brook University | October 2012

9. Bxy1 : 55Fe calibration • Setup • Gas: Ar+10% CO2 • Preamp: Ortec 142B • Amp: Ortec 472A • MCA • HV mesh: 520 V • HV drift: 750 V RD51 Collaboration meeting | Stony Brook University | October 2012

10. Bxy2 : Second batch (september 2012) • Contact with SERITEC (Switzerland) • Stretching with a tension of 15 N.cm 3 detectors deliveredat Saclay at the beginning of september RD51 Collaboration meeting | Stony Brook University | October 2012

11. Measurements by Elvia/ cirea MOhms F1 average F3 F4 RD51 Collaboration meeting | Stony Brook University | October 2012 One measureevery 10 strips

12. Elvia/ cirea detector section PCB multi-layer Resitivebulk XY section: pillar 449 µm 201 µm wires 187µm Nominal numbers Coverlay: 64 µm Amp gap: 128 µm Pillarabovemesh: 64 µm Total pillarheight: 192 µm Resist. thickness: 35 µm Mesh : 45/18 µm (30 µm) 97µm resistivestrip 38 µm 355 µm RD51 Collaboration meeting | Stony Brook University | October 2012

13. Reception in saclay • The meshiswellstretched(no more waves) • Voltage test in air far from the nominal values • Voltage test in gasimproved (few nAat 500/600 V)  drying? RD51 Collaboration meeting | Stony Brook University | October 2012

14. First gain measurement on F4 Without source 6 keV • Same setup thanbefore • HVm: 580 V • HVd: 780 V • Gain ~ 8000 • dE/E ~ 26 % With source RD51 Collaboration meeting | Stony Brook University | October 2012

15. F4 afterwashing Transparency • Washing in pure water • Nitrogendrying • Ovencuring (50°C) for one night HVm: 550 HVd: 650 Gain: 7500 dE/E ~ 18% RD51 Collaboration meeting | Stony Brook University | October 2012

16. The other detectors • Samewashing program than for the F4 but no improvement • Visually the meshseems to be not attached to the pillarsexcept in the corners F1 F3 RD51 Collaboration meeting | Stony Brook University | October 2012

17. Conclusion • Diagnostic • Meshfloating on two of the detectors due to a lack of insolation  the pillars are not attached to the plane of strips • The coverlayis not enoughcuredexcept for the F4  ovenmalfunctionning • Verypromising • The detector F4 isready to operate • Mesh stretching problemissolved • Resistivityishomogenous • Fine tuning to improve the process (insolation time and coverlaycuring) • Whatnext? • 2 operational detectors are stillneeded for RD51 (already in the working flow) • Large PCBs (1 and 2 x 0.6 m2) have been ordered • Nextstep: larger size RD51 Collaboration meeting | Stony Brook University | October 2012

18. Thankyou ! Commissariat à l’énergie atomique et aux énergies alternatives Centre de Saclay| 91191 Gif-sur-Yvette Cedex T. +33 (0)1 69 08 39 65 | F. +33 (0)1 69 08 56 69 Etablissement public à caractère industriel et commercial | RCS Paris B 775 685 019 DSM IRFUSEDI RD51 Collaboration meeting | Stony Brook University | October 2012