Riunione referee Roma, 04/05/2017 CMS GE2/1 Phase 2 Muon det. upgrade Paolo Giacomelli INFN Bologna On behalf of Bari, Bologna, Frascati (+ G.Bencivenni, G.Morello, M. Poli Lener), Napoli, Pavia
GEM Fase 2 Forward muon system GE21 L1 trigger rate reduction, enhance via redundancy, reconstruction ME0 detector extends coverage and performance of muon Id and trigger beyond η =2.4 e η <2.8 GE2/1 : ME0 : Muon tagger at highest η (η <2.8) • • 1.6 < |η| < 2.4 • 36 20°super-module wedge each • 36 20°super-chambers consist 6 layers of chambers. • Total number of chambers:72 • Numb. of chambers: 216 • Installation: YETS 2022 Installation: July 2024 GEM Phase 2 : Trigger and reconstruction •
Technologies & Timeline GE2/1 ME0 1. GEM : GE1/1-like station 1. GEM : GE1/1-like station 2. New improved MPGD 2. New improved MPGD detectors for detectors µ RWELL high time resolution ( Fast Timing MPGD) Q3 2017 TDR Q2 2018: Decision on GE21 technology Q4 2020: Decision on ME0 technology GE1/1 GE2/1 ME0 3
GE2/1 baseline solution: triple-GEM The baseline GE2/1 station consists of 36 20 0 Super Chambers with the layout will be similar to GE1/1, but covering much larger surface. It will be the largest GEM detector ever built. Triple GEM detector with the same “operational layout 3/1/2/1” adopted for the GE1/1 chambers has been chosen as baseline solution. Well-known technology • Easy to implement • Match the detector requirements (GE1/1 even more demanding) • 88 mm YE YE1 2 ME2/1 CSC Shielding 4 04/05/2017 Paolo Giacomelli
GE2/1 baseline solution: triple-GEM GE2/1 chamber segmented in 4 horizontal modules, • ~ 47 cm (PCB uniformly segmented) M4 Max PCB size about 1200 mm X 460 mm (M4) • M4 size comparable with the GE1/1 Long chambers • M3 All detectors components available on the “Market” • GEM foils production could be split between CERN • M2 and Korea (Korea group It has already proved to be able to produce foils for M1 and M2 module, for the time of module construction they expect to be able to produce also M3 (probably also M4)) M1 5 04/05/2017 Paolo Giacomelli
GE2/1 baseline solution: triple-GEM Mechanical Summary • 72 Chambers (20 deg.) == > 36 Super Chamber • 288 Modules == > 4 different types • Max module size ~ 45 cm X 120 cm ( similar to GE1/1 long ) • 864 Foils == > 4 different types • 72 Strips group per chambers not equally distributed between the modules 6 04/05/2017 Paolo Giacomelli
GE2/1 baseline solution: triple-GEM The triple GEM detectors, the baseline option chosen for the GE2/1 modules, is the same technology used by GE1/1 this mean: • Well known performances (GE1/1 expected rate higher than GE2/1) • No additional aging test needed, the GE2/1 will use the material components adopted for the GE1/1 • Tooling and setup , (some of them quite expensive: X-ray, copper boxes, cosmic ray stand, …) prepared for the GE1/1 production can be reused for the GE2/1 production and tests. • Crew trained for the production and test of the GE1/1 can easily move to the production and test of the GE2/1 baseline option. • Production sites “certified” for the production of GE1/1 chambers don’t need to be certified again • Production of GE2/1 modules can be seen as continuation of the GE1/1 chambers 7 04/05/2017 Paolo Giacomelli
GE2/1 M4 assembly GE2/1 M4: stack assembly GE2/1 M4: foils cut and stack preparation 8 04/05/2017 Paolo Giacomelli
GE2/1 M4 assembly GE2/1 M4 stack fixed on the Drift boards and stretched by means of the pull-out Detail of one insert placed in the middle of the GEM stacks 9 04/05/2017 Paolo Giacomelli
GE2/1 M4 assembly GE1/1 V4/5 Internal frames V7 Internal frames GE2/1 V1 Internal frames No more protuberances in the internal frames, 2 mm of distance between the active GEM area and the internal frames, 10 04/05/2017 Paolo Giacomelli
GE2/1 M4 assembly • M4 chamber assembled in 20 0 sector frame. 11 04/05/2017 Paolo Giacomelli
GE2/1 alternative option: µ RWell The plan is to build a full scale GE2/1 μ-RWELL with M4 operating sectors. 1) M4 left and right are mirrored. 2) Size: 606.5 x 498.5 x 1 mm 3) Strip layout inspired to the GE2/1 GEM option 4) Final drawing finished (Gatta-LNF) M4 5) DLCed foils ready (Ochi-Kobe) 6) Preliminary tests at ELTOS done 7) PCB production at Eltos started, next glue with caption foil M3 M2 M1 12 04/05/2017 Paolo Giacomelli
GE2/1 alternative option: µ RWell ✓ 24 Feb : draft of the drawings to ELTOS for preliminary offer (Bencivenni - Gatta) ✓ 15 March : validation of the M4-left/right drawings (De Oliveira – Gatta) ✓ 20 March : final discussion of the M4-left/right drawings with ELTOS (Bencivenni - Gatta) ✓ 27 March : preliminary offer from ELTOS ✓ 3 - 07 April : formal offer and ORDER to ELTOS done by CMS-CERN (Benussi - Giacomelli) 23 March-21 April : construction of the M4-left/right PCBs and gluing of the DLCed foils (ELTOS – Gatta, Poli Lener) 24 - 28 April : delivery PCB-RWELL M4 at CERN (ELTOS) 1 - 26 May : Copper and Kapton etching + cut to size and HV test at CERN (De Oliveira –Teixeira, confirmed) 29 May - 1 June : delivery M4-left/right at LNF (De Oliveira, confirmed) 1 - 28 June : M4-left/right assembly with the G2/1 mechanics + TEST (HV and gas tightness) (LNF and Bari group) 28 - 30 June : shipping/transportation of the G2/1 detector at CERN (Benussi) 5 - 19 July : test beam at H4 (responsible Giacomelli) 13 04/05/2017 Paolo Giacomelli
GE2/1 µ RWell-GEM synergies • Same gas mixture • Same electronics • Same cooling • Same detector control system • Same strips orientation and dimension • Very similar mechanical frames 14 04/05/2017 Paolo Giacomelli
GE2/1 µ RWell-GEM evolution • Only 1 kapton foil instead of 3 • Kapton foil glued to PCB: no stretching needed • Single amplification layer • Resistive DLC layer makes the chamber very spark safe • Simpler etching of the caption foil • Less components, simpler construction → significant cost reduction 15 04/05/2017 Paolo Giacomelli
GE2/1 µ RWell: mockup The parts of the mock-up have all been delivered and assembled at LNF 16 04/05/2017 Paolo Giacomelli
GE2/1 µ RWell: test at H8 (nov. 2016) 1. Construction & test of the first 1.2x0.5m 2 (GE1/1) µ -RWELL 2016 2. Mechanical study and mock-up of 1.8x1.2 m 2 (GE2/1) µ -RWELL 2016-2017 3. Construction of the first 1.8x1.2m 2 (GE2/1) µ -RWELL (only M4 active) 01-09/2017 Per costruzione M4 chiediamo 20kE ( PCB+laminazione+lavorazioni+etching Rui) H8 Beam Area (18 th Oct. 9 th Nov 2016) Muon/Pion beam : 150 GeV/c N° 2 LHCb µ -RWELL protos 10x10 cm2 40-35 M Ω / ☐ 400 µ m pitch strips Beam GEM S3 S2 S1 GEM Tracker 1 Tracker 2 N° 1 CMS µ -RWELL proto 100x50 cm2 70 M Ω / ☐ 800 µ m pitch strips 17 04/05/2017 Paolo Giacomelli
GE2/1 µ RWell: H8 preliminary results Preliminary Preliminary 97% 5,7ns Measurements done with GEM by LHCb group gave σ t = 4.5 ns with VTX chip, constant fraction discriminator [1]. We wish to perform the same measurement with μ-RWELL at BTF (LNF). Gas mixture : Ar/CO 2 /CF 4 = 45/15/40 Different chambers with different dimensions and resistive schemes exhibit a very similar behavior although realized in different sites (large detector partially realized outside CERN). [1] G. Bencivenni et al, “Performance of a triple-GEM detector for high rate charged particle triggering”, NIM A 494 (2002) 156 18 04/05/2017 Paolo Giacomelli
GE2/1 µ RWell: GIF++ ageing test Context : CMS Muon System, R&D Phase II Upgrade with MPGD: μ -RWell Motivations : Need to qualify the behaviour and performance of optional prototypes to GEM detectors ( μ -RWell detectors) in a harsh radiation environment. Duration of the test: 1) GE1/1 μ -RWell (ArCO 2 ) 2 m at least 3 month 2) “high rate” μ -RWell (ArCO 2 CF 4 ) (GE2/1 without 10cmx10cm safety factor) but 3) reference μ -RWell (ArCO 2 ) probably ~1 year 10cmx10cm 50 cm 50 cm 19 04/05/2017 Paolo Giacomelli
GE2/1 µ RWell: GIF++ ageing test 1) GE1/1 μ -RWell (ArCO 2 ) 2) “high rate” μ -RWell (ArCO 2 CF 4 ) 10cmx10cm 3) reference μ -RWell (ArCO 2 ) 10cmx10cm uRWELLs in their location inside the GIF++ 20 04/05/2017 Paolo Giacomelli
GE2/1 µ RWell: GIF++ ageing test Ageing Accelerating factors at GIF++ w.r.t to GE2/1 10 years at HL-LHC CMS GIF++ GE2/1 HR Large area REF e 1.60E-19 e 1.60E-19 1.60E-19 1.60E-19 N 40 N 60 70 40 G 4000 G 3000 3000 3000 Φ [Hz/cm2] 1000 I (nA) 855 1146 19.4 Δ T [s] 1.0E+08 I (nA/cm2) 8.55 3.82 0.776 ê ê ê ê I (nA/cm2) 2.56E-02 acc. factor 334 149 30 Q (mC/cm2) 2.56 Δ T [h] 83.2 186.2 35796.1 21 04/05/2017 Paolo Giacomelli
GE2/1 summary • GE2/1 sector mechanical mock-ups built • Both for triple-GEM as well as for µ RWell • Triple-GEM M4 modules built and assembled in mockup • µ RWell M4 modules being built • Will be ready in June 2017 • Tests at LNF in June • H4 beam test 5-18 July 2017 • µ RWell vs. GEM → significant cost reduction 22 04/05/2017 Paolo Giacomelli
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