Summary of 2016 activities and future plans

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Presentation transcript:

Summary of 2016 activities and future plans Picosecond Summary of 2016 activities and future plans

outline Introduction to picosecond Summary of 2016 activities Future R&D plans Intrinsic Resolution… looking for the limit Detector Optimization and Scaling… towards applications

References for more details… A picosecond Micromegas EUV photodetector, T. Papaevangelou, 8th symposium on large TPCs for low-energy rare event detection, 5-7 December 2016, Paris (https://indico.cern.ch/event/473362/contributions/2317653/attachments/1384392/2105987/TPapaevangelou_MM_PicosecondPhotodetector.pdf) (Ultra-) Fast tracking of Minimum Ionizing Particles with a Micromegas detector, T. Papaevangelou, 14th Topical Seminar on Innovative Particle and Radiation Detectors (IPRD16) 3 - 6 October 2016   Siena, Italy (http://www.bo.infn.it/sminiato/sm16/04_Giovedi/Mattina/10_Papaevangelou.pdf) Report on PICOSEC Beam tests , S. White, MPGD Applications Beyond Fundamental Science Workshop and the 18th RD51 Collaboration Meeting, Aveiro, Portugal (https://indico.cern.ch/event/525268/contributions/2298965/attachments/1335651/2008896/aveiroSeb.pdf) Picosec: test beam summary and outlook, F. Resnati, MPGD Applications Beyond Fundamental Science Workshop and the 18th RD51 Collaboration Meeting, Aveiro, Portugal (https://indico.cern.ch/event/525268/contributions/2297868/attachments/1336635/2010819/testBeam.pdf) RD51–H4 –May/June 2016 Test beam, M Lupberger, RD51 Mini-Week 6-9 Jun 2016, CERN (https://indico.cern.ch/event/532518/contributions/2195706/attachments/1287366/1915899/PicosecondeTestBeam.pdf ) Fast Timing for High-Rate Environments with Micromegas, T. Papaevangelou, MPGD 2015 & RD51 Collaboration meeting 12-17 October 2015 Trieste – Italy (https://agenda.infn.it/contributionDisplay.py?contribId=83&sessionId=2&confId=8839 , https://arxiv.org/abs/1601.00123 )

Why tens of picoseconds are interesting…. R&D for a Dedicated Fast Timing Layer in the CMS Endcap Upgrade S. White https://arxiv.org/pdf/1409.1165v2.pdf

Being fast and precise with gaseous detector…. At the same time in the same place “primary” electrons localized in time and space (electrons from solid converter) with negligible contribution from the ionization in the gas Direct ionization in gas limits the time response A picosecond Micromegas EUV photodetector, T. Papaevangelou, 8th symposium on large TPCs for low-energy rare event detection, 5-7 December 2016, Paris

Photoconverters… CsI…. Sub-nanosecond time response

Saclay&CERN/Princeton (Ioannis&Sebastian Saclay&CERN/Princeton (Ioannis&Sebastian..) proposal: Fast Timing for High-Rate Environments: A Micromegas Solution Cerenkov radiator prompt photon source Small Drift low primary ionization in gas low diffusion Pre-amplification longitudinal diffusion reduced effects of primary ionization in gas reduced (semitransparent photocathode configuration) RD51 common fund project

Starting form the first Picosec prototype (1cm diameter active area)….

..plus some hints from (Rob) simulation for the gas choice…. 5 % 10 % 15 % 20 % 100 % @ 0.5 bar

… the first validation of the idea came (2015) Time response vs photoelectrons – Laser Tests IRAMIS facility @ CEA Saclay UV laser with σt << 100 fs Al Layer You forget about radiator and photo conversion… you stay focused on nphe … no matter how they are produced

100ps  5phe (*) 50ps  20phe 30ps  60phe Dependence with the drift field Dependence with the number of photoelectrons 1phe with about 150-200ps 2015 run: Ne (90%) + C2H6 (10%) No gas circulation - gas renewed every 24 h Single p.e. σt~180 ps @ ~12 kV/cm2 100ps  5phe (*) 50ps  20phe 30ps  60phe (*) Results relative to the specific configuration used, to be NOT considered as the best results achievable. Fast Timing for High-Rate Environments with Micromegas, T. Papaevangelou, MPGD 2015 & RD51 Collaboration meeting 12-17 October 2015 Trieste – Italy (https://agenda.infn.it/contributionDisplay.py?contribId=83&sessionId=2&confId=8839 , https://arxiv.org/abs/1601.00123 )

After the laser test… next step … validation with charged particles (MIPs): Time response with muons beam (150GeV) Picosec Readout: Cividec C2 2GHz, 40 db preamplifier acquired via (LeCroy) Oscilloscope Timing: MCP-PMT (see S. White talk in WG1 session)

During the 2016 test beam campaign we learned how to get “clean” signal out of picosec… Mesh Grounded, Signal routing and connectivity (SMA), grounding

Development of robust analysis Analysis by S. Tzamarias(Aristotle University of Thessaloníki (GR)) See mini week talk: Re-analysis of picosec-Micromegas detector, WG2 session, Wednesday 14th

Development of simulations of the induced signals F. Resnati, Internal GDD-FT Joint Meeting

Current status of measurements, developments and tools of the Picosec Collaboration Photoelectron response (laser) (Clean) MIPs Response (test beam) Robust data analysis Simulation (and prediction) of Induced Signal

2016 Test Beam Campaign 150GeV muons, SPS North Area Extraction lines, RD51 Test beam (H4 area) Picosec Readout: Cividec C2 GHz, 40 db preamplifier acquired via (LeCroy) Oscilloscope Timing: MCP-PMT (see S. White talk after) Triggering: small active area (efficiency) 5x5mm2 with preliminary veto for single muon selection or large area (border effects) 2x2cm2 scintillators Tracking: triple GEM tracker (secondary veto for single muons selection, spatial response of picosec)

Signal (Timing,amplitude) info from Oscilloscope (Picosec/MCP-PMT) Synchronization with SRS-APV25 GEM tracker (J. Bortfeldt) for uniformity/border effects/… Analysis tools almost finalized (Spyros)… Binary data conversion and compression (Yi) ready to start

Radiator Crystal: Different Thicknesses of MgF2 (2,3,5mm) Different MgF2 producer

Photocathodes Photocathodes: CsI different “producer” (CERN, Saclay, Hamamatsu) different thicknesses (11, 18, 25, 36nm) different metallic layer (Al, Cr) different metallic layer thickness (Cr 3,5.5nm) Metallic Al, Cr (10,15,20nm) Diamond B-doped Diamond on Cr

Sensor (Micromegas mesh) Different Meshes Tested: standard bulk bulk with reduced number of pillars thin mesh micro-bulk (laboratory tests)

Gas and Fields Ed Eg Test at different gas mixture Test at different fields Eg

Grounding and Signal routing Important Improvement in the Signal Integrity Mesh ground: amp and drift field (more) decoupled (in case of sparks) Different grounding configuration -HV SHV/SMA connector High Voltage on mesh / grounded mesh +HV

Ed -HV Eg +HV Crystal: Different Thicknesses of MgF2 (2,3,5mm) Different MgF2 providers Photocathode: CsI different producer (CERN, Saclay, Hamatsu) different thicknesses (11, 18, 25, 36nm) different metallic interface (Al, Cr) different metallic interface thicknesses (Cr 3,5.5nm) Metallic Al(8nm), Cr (10,15,20nm) Diamond B-doped Diamond on Cr Test at different gas mixture Ed -HV Test at different fields Eg Mesh: standard bulk bulk with reduced number of pillars thin mesh micro-bulk (laboratory tests) SHV/SMA connector High Voltage on mesh / grounded mesh +HV

2017 R&D Activities Intrinsic Resolution (pure detector physics R&D): photoelectrons extraction (crystal, photocathodes,…) gas and fields optimization meshes and gaps Detector Optimization (towards application): photocathode aging: measurement and improvement (protection layer, metallic photocathodes, diamond,…) photocathode robustness: sparks Resistive micromegas Detector Scaling (towards application): multi-anode readout Larger area

2017 R&D Activities To be ready to face future problems Detector Optimization (towards application): photocathode aging: measurement and improvement (protection layer, metallic photocathodes, diamond,…) photocathode robustness: sparks CsI… How to preserve its properties.. Not necessarily bad but for sure difficult to handle in some applications CsI Aging (std units mC/cm2-mm2) and sparks (protecting, quenching..) From literature… From the August Test Beam..… Sparks Picosec (T. Schneider) Protection Layers (looking for new materials and protective structures… starting from literature – Va’vra[WIS] https://cds.cern.ch/record/287770/files/SCAN-9509070.pdf just as an example)

Resistive Micromegas… More stable and spark quenching… 2017 R&D Activities To be ready to face future problems Detector Optimization (towards application): photocathode aging: measurement and improvement (protection layer, metallic photocathodes, diamond,…) photocathode robustness: sparks Resistive Micromegas… More stable and spark quenching… Resistive Micromegas First step… same detector size as now (single channel, 1cm diameter active area) Easy to test… no needs of beam… a lighter will be enough… Induced Signal (analytical and simulation) Interest expressed already by Supratik/Nayana… Maybe the next task for W. Riegler: timing properties of induced signal in presence of resistive material… time properties

Not bad… but to be improved 2017 R&D Activities To be ready to face future problems Detector Optimization (towards application): photocathode aging: measurement and improvement (protection layer, metallic photocathodes, diamond,…) photocathode robustness: sparks Metals… Not bad… but to be improved Metals…. Al, Cr … interesting results from beam measurements… … looking for possible optimization (thickness, other metals/oxides…).. or for an higher number of photons… Thicker Crystal (more photons) in a pattern with reflective surfaces (parallelepipedes)…. To preserve position and high multiplicity operation? Maybe…. Already exploited in different application…

Diamond … the first one we are looking more deeply…. 2017 R&D Activities To be ready to face future problems Detector Optimization (towards application): photocathode aging: measurement and improvement (protection layer, metallic photocathodes, diamond,…) photocathode robustness: sparks New materials.. Diamond … the first one we are looking more deeply…. Diamond…. as photocathodes… or as secondary emitter… ongoing activities and different “collaborators-producer” involved Saclay (Pomorski et al) … tested already on beam Aveiro (Joao Veloso et al)… sample in the lab to be tested Russian Academy of Sciences, Moscow (Mikhail Negodaev)… preliminary sample in the lab, partially tested, new production ready to go after specs defined more precisely

Detector Scaling (towards applications): 2017 R&D Activities Detector Scaling (towards applications): Larger area.. MgF2.. 50mm standard production … possible to go for larger area too… preserving the signal integrity and stability with larger meshes preserving the gaps uniformity on larger surfaces … multi-anode readout (standard Micromegas 2x2, 4x4,.. Pads of about 1cm2) preserving signal integrity with routing/vias/… coupling between channels and S/N …. multi-anode readout with Resistive Micromegas (resistive layer, discrete/embedded resistors,…) Electronics... Cividec for sure at the beginning but some new development (amplifier) could be needed to cope with a larger numbers of channels Oscilloscopes and multichannel fast digitizer (SAMPIC,..)

Summary Successful measurement campaigns in 2016 Less than 50ps - “100%” efficient (MIPs) - achieved with CsI (in one of the good configuration, not necessarily in one of the best ones) Complete analysis of the different configurations tested to be done To quantify and verify the actual feeling we have on the collected data Interesting and exciting R&D (not exclusively Picosec related) in front of us Touching the intrinsic limit… Detector Optimization (new photocathodes, protection layer, secondary emitter,.., resistive mm) Detector Scaling.. Larger area and multi channel Mandatory in view of certain applications Large community (not only in our field) involved on this subject