CMS Spokesperson Report - Current Status and Challenges Talk - PowerPoint PPT Presentation

CMS Spokesperson Report - Current Status and Challenges Talk Presented to CMS RRB-45 CERN-RRB-2017-096 Joel Butler Oct. 24, 2017

Outline  Introduction  Management and Collaboration News  2017 Run  2018 Run and LS2  Computing  Some Recent Physics Highlights  CMS HL-LHC upgrades: Progress towards TDRs, LHCC/UCG Reviews, and Schedules  Summary and outlook RRB45 24/10/17 2

Introduction RRB45 24/10/17 3

From last RRB: Challenges Ahead, Task “Pileup” in 2017  Execute the Extended Year End Technical Stop (EYETS) – installation parts of the Phase I Upgrade  Produce extensive physics results on full, larger than expected, 2016 data set  with a computing budget that is rising less than the data volume  Do FOUR Phase 2 Upgrade TDRs (Tracker, Barrel Calorimeter, Muon detectors, Endcap Calorimeter) and TWO Interim design documents (Trigger, DAQ/HLT)  Take high quality data in 2017 with rising luminosity and analyze it quickly and efficiently  Continue to build the remainder of Phase I Upgrade We are now well along in this program and have generally met the challenge with some bumps RRB45 24/10/17 4

Management News RRB45 24/10/17 5

Management Evolution  September 1 is the date when new appointments go into effect for coordinators, system managers , spokespersons, CB chair team, as well as corresponding deputies and many conveners, L2, and L3 managers  The new Management Board Organigram is on the next slide  The previous one is in backup  “Other States B” is a new category in the Regional Representation that is driven by expansion of CMS member institutions that are not from full CERN Member States  Upgrade Coordination will be stable through the completion of the TDRs and costs but will have some changes that will be up and running well before next September RRB45 24/10/17 6

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Collaboration News RRB45 24/10/17 8

Status of Initiatives, etc.  Diversity Study group  Conveners chosen, remainder of committee being recruited  Machine Learning Forum Successfully Launched  Evolution of the Computing Model, a.k.a., ECoM17, delivered its final report and has been told to implement it  Considering formation of a group to consider more distant future – HL-LHC  Plan transition of HL-LHC Upgrade from development and approval of TDRs to execution of the upgrade Will use a “Reflection Group” to make a plan for the  management/coordination of the upgrade to presented in December of 2017 for approval in February 2018 RRB45 24/10/17 9

Expanding and improving CMS Engagement Office was established about 10 months ago. Led by Kerstin Borras Mandate: help and support CMS, on the side of the institutes as well as on the side of the projects and coordination areas, to cope with the unprecedented list of tasks to be accomplished. The Engagement Office is charged to work with all stakeholders, including existing committees and bodies, to identify areas of concern and to develop solutions.  4 main areas of activities: 1) Institute Engagement • For New institutes: Set up all procedures and helping new institutes phasing in to CMS • For Member institutes: Provide assistance to institutes experiencing problems to phase into CMS and to contribute at an appropriate level 2) Coverage of Tasks, Remote Contributions, Efficiency & Sustainability 3) Coordination of EPR (service work) and related items 4) Measures for Diversity, Young Scientists, Career Evolution RRB45 24/10/17 10

New Collaborators  New members (approved at June or September CMS week)  Full member: Montenegro University, Montenegro, Sun Yat-sen University, China, Tsinghua University, China  Cooperating member: Northern Illinois University, USA  Associate member: Lebanese American University, Lebanon  Associate member: Sevilla University, GIE, Spain  Other actions taken by CB in CMS Week in Rio de Janeiro (Sept)  Presentations  Sri Lanka: consortium of University of Colombo and University of Ruhuna presented case for full membership  Latvia: consortium of Riga Technical Institute (RTU) and University of Latvia (LU) presented case for full membership  Dundee University, UK: presented case for Associated membership  New Institutes  5 institutes (2 new countries) to present in Dec: 1 full member (Mexico), 3 cooperating (Qatar, Kuwait, Lebanon), 1 associate (Poland)  > 5 in exploration phase 24/10/17 RRB45 11

Operations: 2017 Startup after Extended Year-End Technical Stop (EYETS) RRB45 24/10/17 12

Operations Status  From my Feb 21, 2017 report to LHCC 129, about startup of the Pixels  “Startup Implications: We will lose some luminosity at the beginning of the run since some commissioning must be done with collisions . We expect to “ effectively ” recover it through higher efficiency, better resolution, and lower fake rate.  Pixel Commissioning seemed more difficult than anticipated  Timing problem between Layer 1 and Layer 2  Layer 1 Readout chip efficiency problem  Higher noise in Layer 1 than design goal  Single Event Upsets (SEUs) from the TBM  This led to extra commissioning time early in run  Dead time due to stuck modules has been “mitigated” by system of local resets which we have been steadily improving  Some down time because Power cycling is necessary to clear some stuck TBMs (SEUs)  We have recovered operational efficiency  even at high luminosity  Performance is better at this early stage than the best (final re-reconstruction) we had in 2016 data even at 1.8E34, achieved in 2017 RRB45 24/10/17 13

Data Recording Efficiency • The recording efficiency so far in 2017 is 89.8% as compared to 92.5% for 2016. • This reflects the period to commission the pixels and to resolve the problems • This has improved lately, to mid 90’s, even in very high luminosity running • I had expected to lose about 10% of the data for the run, but the actual loss is ~1 fb -1 , or 2.7% “so far”, much, much less than we will gain in performance • We are now running leveled at 1.5E34 leveled with the machine over 1.8E34 (but fewer bunches, 1868) and recently up to 2.2E34 • Pileup can be as high as 50-60 RRB45 24/10/17 14

Selected performance results: Pixel Hit Efficiency August 2017 2016 Old detector Note: the x scales are different!!  Dynamic inefficiency is much smaller than in the old detector  … but expected to be even smaller: ~98% at 2*10 34 cm -2 s -1 15 RRB45 24/10/17

Some B Physics Plots (from early in the run, ~ July 20) DP-17-029 RRB45 24/10/17 16

Pixels after Technical Stop 2 (TS2) (week 39)  At TS2, we were doing well with the pixel detector  Systems of soft resets and power cycles kept efficiency high  The detector was keeping up with very high luminosity  After TS2, we encountered a new problem (about two weeks ago)  After a power cycle to free stuck TBMs, DC-DC converters began to die permanently  This reduces our ability to deal with stuck TBMs  We are attacking this problem vigorously, but so far do not understand it  While we are able to run through 2017 with only a slight loss of efficiency, efficiency may be a problem if 2018 brings very high luminosity  We have to consider the possibility that we will need to access the detector in the YETS and, if granted, this could add time to its overall length (which we will of course try to minimize) RRB45 24/10/17 17

HF Phase 1: Summary  New handles to achieve noise reduction are in use: – PMT with dual- anode readout and TDC information  Smooth installation and operation – All 3456 channels, ADC&TDC, working  Substantial rate reduction for MET paths achieved  The HF Upgrade is done RRB45 24/10/17 18

Hadron Endcap Calorimeter (HE) Phase 1 Modified Plan  Silicon Photomultipliers (SiPMs) are a new technology that provides superior performance than the Hybrid Photodiodes used as the photosensors for HB and HE  3X the quantum efficiency, high gain  better S/N, no High voltage necessary, works in strong B fields, low cost,  Decided not to install the full 36 Readout Boxes in 2017  Degradation of the signal with radiation exposure lower than projected  not needed for the 2017 run  We did Install ONE Readout Box (HEP17), initially as an installation test, but after detailed review of impact on 2017 analysis kept upgraded HEP17 in for collisions We learned a huge amount about installation, commissioning, performance, which is far superior to current system.  Based on HEP17 success, we are considering the installation of the full HE upgrade in YETS 2017-18 (normal winter stop)  Otherwise must install in LS2 along with Barrel Hadron Calorimeter (HB) RRB45 24/10/17 19

Run 2 Status and Issues, Progress and Plans for 2017 and 2018 RRB45 24/10/17 20

Run 2 Schedule YETS • 16L2 led to luminosity on the low side in the first part of 2017 • Measures discovered led to higher luminosity, but also with higher pileup • Peak luminosity limit achieved is ~2.2e34 ! • 2018, after 16L2 is remedied, is expected to be a heavy luminosity production year so will have well over 100 fb -1 from Run 2 • ~3% of integrated luminosity expected by the end of the program 24/10/17 21 RRB45