1 / 15

Novel Gaseous Detectors and Technology R&D

ECFA meeting muon theme3. Novel Gaseous Detectors and Technology R&D. M. Abbrescia (CMS), P . Iengo (ATLAS), D. Pinci ( LHCb ). General considerations.

galia
Télécharger la présentation

Novel Gaseous Detectors and Technology R&D

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ECFA meeting muon theme3 NovelGaseousDetectors and TechnologyR&D M. Abbrescia (CMS), P. Iengo (ATLAS), D. Pinci (LHCb)

  2. Generalconsiderations • All detectors foreseen for post-LS3 with the aim of restore redundancy or increase coverage should stand a rate capability higher then the present • Because installed in high-ηregions • From 1 kHz/cm2 5-10 kHz/cm2 RPC rate capability • In addition we could be willing to improve also: • Time resolution – from o(1 ns)  o(100 ps) • Spatial resolution – from o(1 cm)  o(1-0.1 mm) • Given requirement on rate capability, choice of the technology will be driven by the physics case: • plus robustness, cost, easiness of construction, etc. • For instance, o(100 ps) would push us toward RPC multigaps solutions

  3. CMS

  4. The technology: Gas Electron Multipliers Developedby F. Sauli in 1997 Eachfoil (perforatedwithholes) is a 50 µm kaptonwithcoppercoatedsides (5 µm ) Typicalholedimensions: Diameter 70 µm, pitch 140 µm • Electron multiplicationtakesplacewhentraversing the holes in the kaptonfoils • Manyfoils can be put in cascadetoachieve O(104) multiplicationfactors • Maincharacteristics: • Excellent rate capability: up to 105/cm2 • Gas mixture: Ar/CO2/CF4 – notflammable • Largeareas ~1 m x 2m with industrial processes (costeffective) • Long termoperation in COMPASS, TOTEM and LHCb

  5. Detector performance • Verygoodtimeresolution • Dependingcritically on the gas mixture • Long R&D on gas (and otherissues) • Excellentspatialresolution • Full efficiency at 104overallgain A new VFAT3 baFEelectronicsbeingdevopedtofully profit fromallthesecaracteristics σt=4 ns Gain = 104 σs = 150 µm

  6. The GEM project: GE1/1 After LHC LS1 the |η|< 1.6 endcapregionwillbecoveredwith 4 layersofCSCs and RPCs; the |η|>1.6 region (mostcritical) willhaveCSCsonly! • Restore redundancy in muon system for robust tracking and triggering • Improve L1 and HLT muon momentum resolution to reduce or maintain global muon trigger rate • Ensure ~ 100% trigger efficiency in high PU environment

  7. And beyond…R&D on glass RPC • New “low” resisitivity (1010Ωcm) glassusedfor high rate RPC • RPC rate capabilitydependslinearly on electroderesistivity • Smootherelectrodesurfaces reduces the intrinsicnoise • Improvedelectronicscharacterizedbylowerthresholds and higheramplification • Single and multi-gapconfigurations under study Readout pads (1cm x 1cm) Mylar layer (50μ) PCB interconnect Readout ASIC (Hardroc2, 1.6mm) PCB (1.2mm)+ASICs(1.7 mm) PCB support (polycarbonate) Gas gap(1.2mm) Cathode glass (1.1mm) + resistivecoating Mylar (175μ) Ceramic ball spacer Glass fiber frame (≈1.2mm) • Excellent performance at localizedbeamtests • Rate capability ~ 30 kHz/cm2 (multi-gap) • Timeresolution 20-30 ps

  8. Needs for new technologies • Operationat the HL-LHC willbeverydemanding for the muon detectors • Alreadyafter LS2 the present muon spectrometerneeds an upgrade in the innerwheels • Degradation of the MDT performance in terms of efficiency and resolution • Level1 muon trigger dominated by fakes in the endcap • A number of R&D programmes on high-rategaseous detectors have been carried out • Small-stripThin Gap Chambers (sTGC) • Micromegas (MM) • Small Monitored Drift Tube (sMDT) • Multi-gapResistive Plate Chambers (mRPC) Selected for the ATLAS New Small Wheel • NSW detector requirements • Spatial resolution O(100um) single plane • Time resolution <10ns for BC identification • Angularresolution 1mrad for trigger decision (vertex pointing) • Rate capability > 14kHz/cm2 • High efficiency (>98%) • Goodageing performance • Double trackresolution (d ~few mm)

  9. ATLAS

  10. sTGC • Technologyimprovements: • In large detectors, resistive cathode reduces the operating voltage. • Go from present TGC resistivity (1 MΩ/cm²) to 100 KΩ/cm² and reduce gap between strips to cathode (transparency prop. to RC). • Good performance athigh rate Detector efficiency vs impact angle Position resolution vs impact angle

  11. Micromegas • ATLAS NSW: first large system based on MM • Technologybreakthroug: • Resistivestrips for sparkimmunities • Construction and operationathigh rate of large-area (few m2) detectors possible • Bulk technique replaced by ‘floatingmesh’ configuration • Good spatial resolutionalso for inclinedtracksthanks to uTPCoperation mode Spark protection system Test with neutron flux 106 Hz/cm2 Non-resistive MM Resistive MM Ydrift(5mm) Position resolution vs impact angle ti, xi Yhalf(2.5 mm) uTPCprinciple xhalf

  12. sMDT • 15 mm diameter tubes • Max drift time 185 ns • Occupancyscaleswith max drift time and tube cross section: 6.5% at 3x1034 cm-2s-1 • Gain loss due to space charge effectscales ~r2 • Good spatial resolutionindipendent on track incidence angle • Standard Al tubes, construction procedureswellunder control to equip large area Efficiency vs counting rate Spaceresolution vs distance from the wire 2350kHz/tube 1100kHz/tube

  13. LHCb (tobeadded)

  14. R&Dneeded (tobeadded)

  15. Conclusions (tobeadded)

More Related