Diapositive 1

Resistive bulks industrialization Status report

2 october 2012Fabien Jeanneau| PAGE 1RD51 Collaboration meeting | Stony Brook University | October 2012

Industrialization for the nsw| PAGE 2RD51 Collaboration meeting | Stony Brook University | October 2012Goal (see talk by Joerg Wotschack in WG1)Large resistive detectors (bulk?) of 0.5x1 m2 for end-2012/begin-2013During 2013: technical adaptation (investment in machines) for a width of 1 m to achieve areas of 1 x 2 m2Production during 2014/2015

Road map (NSW milestones)July 2012: delivery of BXY 10x10 cm2 and 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)? Geoazur project (P. Salin)

2013/2014: towards nominal areas (1 x 2 m2)

Industrial partners ELVIA / CIREA (France), ELTOS (Italy), Triangle Labs (Nevada, US)

Elvia / cea partnershipCommon fundings since one year (ANR) to develop large area detectors protected against sparks (SPLAM)COMPASS: large pixel MM detector with buried resistors (see the talk by Damien Neyret and Florian Thibault, WG2)CLAS12: large bulk on thin pcb (resistive solution also studied for the forward)Other PCB studies

| PAGE 3RD51 Collaboration meeting | Stony Brook University | October 2012

PLV bulksfirst step: small bulk XY| PAGE 4RD51 Collaboration meeting | Stony Brook University | October 2012Use of already existing layout

Resistive bulk (50 to 100 Mohms along the strips)

X-Y readout

Active area: 10 x 10 cm 2

Geometry:strip pitch 250 mstrip width 150 m

Y readoutX readoutCoverlayFR-4128 umBulk MeshBXY1 : First batch (july 2012)| PAGE 5RD51 Collaboration meeting | Stony Brook University | October 2012Visit to CIREA (Cholet) in order to make the voltage tests

The visual inspection shows waves on the mesh

Diagnostic: the mesh is not stretch enough

3 detectors are delivered at the beginning of July

Measurements in gas give 55Fe spectrum with low energy resolution and evidence of an inhomogenous amplification gap (due to stretching)

BXy1 : resistivity measurements by ELVIA / cirea| PAGE 6RD51 Collaboration meeting | Stony Brook University | October 2012

MOhmsMOhmsMOhmsMOhmsOne measure every 10 stripsaverage#1#3#2#4

Measurement device: Megger MIT 420Bxy1 : stretching of the mesh | PAGE 7RD51 Collaboration meeting | Stony Brook University | October 2012

~ 1 Microscope measurementsBxy1 : voltage measurements by elvia / cirea#1#2#3 (washed)#4500 V4 nA5 nA5 nA5 nA600 V6 nA7 nA700 V7 nA30 nA8 nA800 V10 nA (unstable)10 nA (unstable)spark10 nA10 nA (unstable)| PAGE 8RD51 Collaboration meeting | Stony Brook University | October 2012

Bxy1 : 55Fe calibration| PAGE 9RD51 Collaboration meeting | Stony Brook University | October 2012

Setup

Gas: Ar+10% CO2Preamp: Ortec 142BAmp: Ortec 472AMCA

HV mesh: 520 VHV drift: 750 VBxy2 : Second batch (september 2012)Contact with SERITEC (Switzerland)Stretching with a tension of 15 N.cm| PAGE 10RD51 Collaboration meeting | Stony Brook University | October 2012

3 detectors delivered at Saclay at the beginning of september Measurements by Elvia / cirea | PAGE 11RD51 Collaboration meeting | Stony Brook University | October 2012

MOhmsOne measure every 10 stripsaverageF1F3F4F1F3F4500 V71 nA65 nA25 nA600 V85 nA82 nA30 nA700 V98 nA127 nA41 nA800 V111 nAunstable68 nA850 V150 nAunstable900 V160 nA1 kVunstableElvia / cirea detector section| PAGE 12RD51 Collaboration meeting | Stony Brook University | October 2012

PCB multi-layer Resitive bulk XY section: pillar449 m201 m187mNominal numbers

Coverlay: 64 m

Amp gap: 128 mPillar above mesh: 64 mTotal pillar height: 192 m

Resist. thickness: 35 m

Mesh : 45/18 m (30 m)97m38 m355 mresistive stripwiresReception in saclayF1F3F4500 V27 nA31 nA24 nA 12 nA750 V40 nA100/200 nA40 nA 20 nA900 V200 nA (2 A)overflow950 Voverflow| PAGE 13RD51 Collaboration meeting | Stony Brook University | October 2012The mesh is well stretched (no more waves)Voltage test in air far from the nominal valuesVoltage test in gas improved (few nA at 500/600 V) drying?

First gain measurement on F4| PAGE 14RD51 Collaboration meeting | Stony Brook University | October 2012

Without sourceWith sourceSame setup than beforeHVm: 580 VHVd: 780 V

Gain ~ 8000dE/E ~ 26 %6 keVF4 after washingWashing in pure waterNitrogen dryingOven curing (50C) for one night

| PAGE 15RD51 Collaboration meeting | Stony Brook University | October 2012

HVm: 550HVd: 650

Gain: 7500dE/E ~ 18%

Transparency The other detectorsSame washing program than for the F4 but no improvement

Visually the mesh seems to be not attached to the pillars except in the corners

| PAGE 16RD51 Collaboration meeting | Stony Brook University | October 2012

F1

F3ConclusionDiagnostic

Mesh floating on two of the detectors due to a lack of insolation the pillars are not attached to the plane of stripsThe coverlay is not enough cured except for the F4 oven malfunctionning

Very promising

The detector F4 is ready to operateMesh stretching problem is solvedResistivity is homogenousFine tuning to improve the process (insolation time and coverlay curing)

What next?

2 operational detectors are still needed for RD51 (already in the working flow)Large PCBs (1 and 2 x 0.6 m2) have been orderedNext step: larger size| PAGE 17RD51 Collaboration meeting | Stony Brook University | October 2012DSMIRFUSEDICommissariat lnergie atomique et aux nergies alternativesCentre de Saclay | 91191 Gif-sur-Yvette CedexT. +33 (0)1 69 08 39 65 | F. +33 (0)1 69 08 56 69Etablissement public caractre industriel et commercial | RCS Paris B 775 685 019| PAGE 18RD51 Collaboration meeting | Stony Brook University | October 2012Thank you !