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ATLAS Upgrade Program

ATLAS Upgrade Program . Erez Etzion, Tel Aviv University. LHC timeline. ATLAS Muon Spectrometer. TGC. MDT. CSC. Thin Gap Chambers. Muon trigger. Why upgrade ?. Performance of the muon tracking chambers will be degraded with the luminosity increase

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ATLAS Upgrade Program

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  1. ATLAS Upgrade Program E. Etzion, RECFA meeting, Tel Aviv Erez Etzion, Tel Aviv University

  2. LHC timeline E. Etzion, RECFA meeting, Tel Aviv

  3. ATLAS Muon Spectrometer TGC MDT CSC E. Etzion, RECFA meeting, Tel Aviv

  4. Thin Gap Chambers E. Etzion, RECFA meeting, Tel Aviv

  5. Muon trigger E. Etzion, RECFA meeting, Tel Aviv

  6. Why upgrade ? • Performance of the muon tracking chambers will be degraded with the luminosity increase • Muon end caps trigger will have too high fake rate Average luminosity : 9.6 1032 cm-2 s-1 luminosity : 1034 cm-2 s-1 Simulated hit rate (Hz/cm2) Range tube rate 200-300 kHz E. Etzion, RECFA meeting, Tel Aviv

  7. NSW trigger concept • Increased Phase I backgrounds, but must maintain existing trigger rate • Filter “Big Wheel” muon candidates to remove tracks that are not from the IPOnly track “A” should be a trigger candidate. • Challenge is latency: 500nsec for electronics + 500ns fibres to be in time for Big Wheel • Micromegas: 2M strips, 0.5mm • sTGC: 280K strips (3.2mm), 45K pads, 28K wires • sTGC, MM find candidates independently, list merged for Sector Logic • Hit per layer: sTGC: hit is centroid of 3-5 strips Micromegas: hit is address of strip    E. Etzion, RECFA meeting, Tel Aviv

  8. Detector layout sTGCs: primary trigger detector • Bunch ID with good timing resolution – additional suppression of fakes • Good space resolution providing track vectors with < 1 mrad angular resolution • Based on proven TGC technology; Pads & strips, instead of only strips as in current detector Micro-Mesh Gaseous detectors (Micromegas): primary precision tracker • Space resolution < 100 μm independent of track incidence angle • Good track separation due to small 0.5 mm readout granularity (strips) • Excellent high rate capability due to small gas amplification region and small space charge effects 9.3m Present Small Wheel – defines basic layout and envelopes 16 detector layers in total 2 technologies, MicroMegasand sTGC E. Etzion, RECFA meeting, Tel Aviv

  9. sTGC Based on TGC technology • Lower cathode resistance – for high rates • Pads – online trigger tower • Strip charge readout – precision coord. readout • Wire readout – coarse fcoord. • Pads coincidence defines ROI and select strips to send to sTGC trig processor where precise position is calculated E. Etzion, RECFA meeting, Tel Aviv

  10. Construction sites E. Etzion, RECFA meeting, Tel Aviv

  11. Muon test beam set up • Muon test beams at CERN (180 Gev) • Two quadruplets equipped with ASD, two monitor chambers (small TGC chambers M1 and M2) and two scintillators Combined test with sMDT Sc1 Sc2 M1 L1 L2 L3 L4 L5 L6 L7 L8 M2 Mechanical system that allows to rotate the TGC with high accuracy E. Etzion, RECFA meeting, Tel Aviv

  12. Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2011 IEEE Position resolution Resolution : difference between expected position from track fit (3 planes) and measured position (4th plane) Position resolution as a function of the incidence angle for the different layers of a sTGC Demonstrated homogeneity of the quadruplet Resolution < 100 mm E. Etzion, RECFA meeting, Tel Aviv

  13. Irradiation with neutrons • Test in Demokritos (Greece) : • Cosmic muons tracking under neutron (5.5-6.5 MeV) irradiation s • No drastic degradation of the efficiency : less than 4% at the highest dose rate • No sparks observed Efficiency rate for L=1035 cm-2s-1 90 E. Etzion, RECFA meeting, Tel Aviv

  14. Irradiation with 60Cosource • Tests at NahalSoreq (IL). • Cosmic muons detection under gamma (~50 Ci60Co source) irradiation. • sTGC is 120x70cm2 was totally irradiated. Position resolution and efficiency measurements with large scale Thin Gap Chambers for the super LHC, arXiv:1006.0135 [physics.ins-det] No efficiency deterioration observed for a flux of 2.104 Hz/cm2 E. Etzion, RECFA meeting, Tel Aviv

  15. nSW - Electronics ·nSWTrigger Processor. A collaboration of Arizona, Brookhaven, Bucharest, Harvard, Saclay, UC Irvine, Weizmann. The Israeli team focuses on the sTGCpart. ·Front-end electronics ASIC. Testing and characterization of the FEE ASIC at Weizmann and Technion. ·         sTGC Front-end boards – collaborating with USTC on the requirements of the sTGCFE boards ·New readout for Phase I and Phase II. A collaborative effort of Argonne, Brookhaven, CERN and Weizmann (initiators!) to develop common readout the shared across ATLAS. It is moves substantial functionality which was previously custom hardware for each detector to commercial PC servers and software. ·nSW Electronics coordinator - L. Levinson (Weizmann) E. Etzion, RECFA meeting, Tel Aviv

  16. New FE ASIC for the nSW : VMM • New ASIC common for MM and sTGC designed in 2011. Israel started testing in 2012 • Front end provides • 64 channels • Time to peak • Time over threshold • Adjustable gain : from 0.5 to 9 V/pC • Adjustable peaking time : from 25 to 200 ns • Threshold per channel VMM1—An ASIC for Micropattern Detectors, G de Geronimo IEEE Trans.Nucl.Sci. 99 (2013) 1–8. E. Etzion, RECFA meeting, Tel Aviv

  17. Result sTGC strip + VMM1 In last test beam, strip readout was realized with ASD and VMM ASD analog output (HV=2.85 kV) VMM 3mV/fC (HV=2.85kV) VMM 9mV/fC (HV=2.7kV) Except for a few minor problems, all VMM features are working VMM2 E. Etzion, RECFA meeting, Tel Aviv

  18. Simulation • Weizmann (S. Bressler) and Irvine U are working on L1 simulation looking at the PADs trigger • U. of Michigan and University of Science and Technology of China are working on the strip trigger side. • Technion (A. Di Mattia) responsible for the integration in Athena. E. Etzion, RECFA meeting, Tel Aviv

  19. Prototype status • 60 x 40 quadruplets • Used to develop concept to construct sTGC • Training field for the new teams • Module -1 • First development of full size sTGC • The type to be built in China • Parts are available and assembly underway E. Etzion, RECFA meeting, Tel Aviv

  20. E. Etzion, RECFA meeting, Tel Aviv

  21. Status Israel • Israel provides overall project coordination • PL – G. Mikenberg • Construction at Weizmann inst. • Cosmic ray testing at Tel Aviv • Electronics developments at Weizmann and Technion • Test beam coordination Tel Aviv & Weizmann • Basic infrastructure well established • Focusing on development of assembly techniques • Knowledge transfer to Canada, Chile, China, US • Recently invested in producing a 40cm x 60cm quadruplet prototype • Developed drawings for full size modules • Production of prototype for the testbeam E. Etzion, RECFA meeting, Tel Aviv

  22. Man power E. Etzion, RECFA meeting, Tel Aviv

  23. Funding • ISF nSW 3M$ paid to CERN in 10 years. • I-Core is an estimated extrapolation. Last two years we got ~30% E. Etzion, RECFA meeting, Tel Aviv

  24. Summary • nSWan approved international collaborative effort for the ATLAS upgrade • As in the ATLAS construction days a common Israeli effort ! • Supported by ISF / institutes and iCORE. • nSW goal is to support high flux radiation without loss of trigger efficiency and position resolution • Sandwich with micromegas : MM for tracking purpose and sTGC for trigger (fully redundant) • First prototype of a new front end designed for MM and sTGC gave good results • Module-1 will go for testbeam at Fermilab on May 2014 • MUON & nSW week in Israel on June. • Working toward installation on 2018. E. Etzion, RECFA meeting, Tel Aviv

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