1. Status of the Muon Alignment System Muon Alignment Group Muon IB December 11th, 2012

2. Status of the Track-based Alignment Status of the Upgrade on the Hardware-based Barrel Alignment Issue with the Hardware-based EndCap Alignment Outline 2Zoltán Szillási (ATOMKI)Muon IB, November 29th, 2011

3. CMS tracking alignment workflow 1.Update Tracker geometry   recently released with 2012 A+B data 2.Update Muon Global Position Record (GPR)   optimum position of Muon system based on reconstruction performance 3.Update Muon geometry with new Tracker and new GPR   run track-based algorithm over 2012 A+B data Muon Geometry was updated in November 2012 DT and CSC chambers aligned with respect to Tracker using track- based algorithm with 2012 A+B collision data  slight performance improvement in Barrel (DTs were already aligned with tracks from 2011 collision data)  significant performance improvement in Endcaps (this is first time individual CSCs are fully aligned with tracks) Muon IB Meeting, 11 December 2012 Overview 3

4. Muon IB Meeting, 11 December 2012 Muon Reconstruction Performance 4

5. Resolution of dimuon mass reconstruction at Z-peak STA+STA muons are used Barrel – no changes Endcaps – improves Muon IB Meeting, 11 December 20125

6. New Muon geometry produced and validated New Tracker geometry and new GPR are used Latest CMSSW and 2012 A+B data are used New Muon geometry is validated Significant improvement in Endcaps this is first time individual CSCs are fully aligned with tracks The new Muon geometry was signed off New Muon geometry is in Data Base and being validated with all other updated conditions Exact description and recipe how to use new Muon alignment and GPR were announced in AlCaDB hypernews on Nov 27, 2012 06:57  https://hypernews.cern.ch/HyperNews/CMS/get/calibrations/1273.html Muon IB Meeting, 11 December 2012 Summary 6

7. Produce new MC scenario matching new Muon geometry Study systematic uncertainties and include them in APEs Superlayers misalignment Compare updated geometry to latest HW geometry check twist effect Repeat Muon alignment workflow including 2012 C data following Tracker geometry update Muon IB Meeting, 11 December 2012 Plans 7

8. Zoltán Szillási (ATOMKI)Muon IB, November 29th, 2011 HW Barrel Ali Plans in LS1 8 ie. As soon as a wheel opens, we have to remove all MABs and transport them to the Alignment Lab In the lab: new targets and calibrations (both for Barrel and Link) In the lab: store the MABs safely Meanwhile in UXC: repositioning the BoardPC and recabling in the shadow of other activities MABs are to be re-installed at the end of other activities right before wheel closed PHOTOGRAMMETRY!!! It takes several hours (~ d/wheel). On MABs we will need everywhere, but will need on chambers that moved, too. AR will be removed before the arrival of the new beampipe and be reinstalled when ready – PG needed! Alignment goes first and returns the last!

9. Zoltán Szillási (ATOMKI)Muon IB, November 29th, 2011 Reinforcement of measurements in Sector 13 & 14 9 The reconstruction error for rotZ of MB4 twin chambers are higher than the other MB4 chambers. Reason: those chambers can seen only from one side Solution: install “Mini MAB” to those chambers. Very similar to the MAB, but it houses only 2 camera. The proposed positions are seen on the drawing below. Due to several reasons (blocking electronic and cooling cables) it is impossible to put Mini MAB to every twin chamber. Results of simulation calculation of errors are on the tables. The position calculations shows the worst case, where the chamber can be seen though two other chamber. With the Mini MABs the alignment precision for these chambers will be better. Sector 13 Sector 14 Sector 4 Sector 10 X Position error for YB0_sect13: w/out MMwith MMs micrometer phi27.420.4 R1423.8166.2 Z1511.290.1 rot_Z error: Sect 14 Sect 10 Wheel w/out MM with MMs w/out MM with MMs mrad 20.130.0460.110.046 10.110.0460.140.046 00.480.0450.480.045 0.110.0460.140.046 -20.130.0460.110.046 Position error for YB0_sect14: w/out MMwith MMs micrometer phi27.47.5 R1423.8135.2 Z1511.270.1 Results of simulation Cameras identical to those used for chimney-chamber regions d Carbon-fiber plate (5mm thickness) Mini MAB YB+2YB+1YB0YB-1YB-2 S4 Proposed MiniMAB arrangement: MAB MiniMAB S13 S10 S14 rot_Z error: Sect 13 Sect 4 Wheel w/out MM with MMs w/out MM with MMs mrad 20.130.0460.110.046 10.110.0580.140.058 00.480.0560.480.055 0.110.0460.140.046 -20.130.0460.110.046

10. Zoltán Szillási (ATOMKI)Muon IB, November 29th, 2011 CMS barrel part during installation 10 Location of the miniMAB (see next page)

11. Zoltán Szillási (ATOMKI)Muon IB, November 29th, 2011 MiniMAB location 11 The miniMAB plate is fixed on rails of the muon chambers (drilling new threaded holes not needed) The cameras are looking into these passages

12. Zoltán Szillási (ATOMKI)Muon IB, November 29th, 2011 MiniMABs 12 Short MiniMAB / Long MiniMAB The base material of the MiniMAB is glassfiber (yellow) The fixation of MiniMAB is not shown in this plan Gábor Endrőczi

13. Zoltán Szillási (ATOMKI)Muon IB, November 29th, 2011 Additional photogrammetry targets/redesign photogrammetry targets on MABs 13 Motivation: There was a discrepancy between the track-based and the hardware alignments both in Z (2mm, scaling?) and phi-like torsion (3mm) So far we have only indirect ways to test where it comes from Torsion has gone, but was not solved by muon hardware alignment! We need a direct external measurement possibility. What to do? Install additional photogrammetry target to MABs These targets are viewable for photogrammetry measurements, when the detector is already closed. Only those targets are measurable, which are marked with solid line. There is a slight chance to measure those target which are marked with dashed line. Impossible to make photogrammetry measurements in those places which are not marked. How? Survey group could measure Z coordinates of them (or at least Z distance) Precision is around 70 microns (discrepancy, we had ~ 2mm!) Maybe they can measure phi position as well ? answer for torsion… If Z-scaling found, its value can be used as a correction later.

14. Zoltán Szillási (ATOMKI)Muon IB, November 29th, 201114 Map of Survey points in UXC 2011 September TS --­­ Visual inspection has been done on the possibility on the MAB visibility and mounting of new Survey brackets on the UXC wall 2011 December (at B=0) final position of brackets were measured (planned to have some installation, but didn’t happen)

15. Zoltán Szillási (ATOMKI)Muon IB, November 29th, 2011 Viewable MABs are for Survey measurements 15 YB0 - -1/1 -1/3 -1/5 -1/7 -1/9 -1/11 YB+2 +3/1 +3/3 +3/5 +3/7 +3/9 +3/11 YB-2 -3/1 -3/3 -3/5 -3/7 -3/9 -3/11 YB0 + +1/1 +1/3 +1/5 +1/7 +1/9 +1/11 YB+1 +2/2 +2/4 +2/6 +2/8 +2/10 +212 YB-1 -2/2 -2/4 -2/6 -2/8 -2/10 -212 Green – measurable Orange – difficult to measure, but not impossible Total Barrel length measurement at Sectors 1,5,11 Partial Barrel length measurement at Sectors 8,11

16. Zoltán Szillási (ATOMKI)Muon IB, November 29th, 2011 Final prototype of the Survey Target holder 16 Final prototype ready. Manufacturing of the large batch is on the way

17. Zoltán Szillási (ATOMKI)Muon IB, November 29th, 2011 Evacuation of BoardPC from the gaps 17 The BoardPC placed between the gaps of the CMS barrel wheels in order to be close to the MABs. These PCs control some part of LEDs and digitalize and analyze the images of the cameras of MABs They are unreachable when the CMS wheels are closed. CMS barrel wheels was open last time in the beginning of 2008 and they are not expected to be open more frequently after LS1. After the failures of image grabbers cards of some BoardPCs, we started to think about to evacuate them to the side of the YBs (we had 3 at the beginning, now we have 7). The possible places to install the BoardPCs has been checked During 2011 November TS.

18. Zoltán Szillási (ATOMKI)Muon IB, November 29th, 2011 BoardPC repositioning – draft plan 18 X1 X2 X3 X4 X5 X1 X2 X3 X4 X5 FarNear Passive wheel (YB±1) Passive MABs (±2/x) Active wheel (YB±2 & YB0) Active MABs (±3/x & ±1/x) Place of BoardPC Probably better place for the BoardPC Extra: X2 Near A3006 PS modules  X4 (YB±1)

19. Zoltán Szillási (ATOMKI)Muon IB, November 29th, 2011 BoardPC repositioning – X1 19 MABs reached Near side:  YB0 – MAB ±1/11  YB±1 – MAB ±2/10  YB±2 – MAB ±3/11 Far side:  YB0 – MAB ±1/9  YB±1 – MAB ±2/8  YB±2 – MAB ±3/9 Place of BoardPC MAB in the gap

20. Zoltán Szillási (ATOMKI)Muon IB, November 29th, 2011 BoardPC repositioning – X3 20 MABs reached Near side:  YB0 – MAB ±1/1  YB±1 – MAB ±2/12  YB±2 – MAB ±3/1 Far side:  YB0 – MAB ±1/7  YB±1 – MAB ±2/6  YB±2 – MAB ±3/7 Passive MAB Active MAB Place of BoardPC

21. Zoltán Szillási (ATOMKI)Muon IB, November 29th, 2011 BoardPC repositioning – X5 21 MABs reached Near side:  YB0 – MAB ±1/3  YB±1 – MAB ±2/2  YB±2 – MAB ±3/3 Far side:  YB0 – MAB ±1/5  YB±1 – MAB ±2/4  YB±2 – MAB ±3/5 Place of BoardPC in YB0 Place of BoardPC in YB±1 & ±2

22. Zoltán Szillási (ATOMKI)Muon IB, November 29th, 2011 Status of the Upgrade 22 Reinforcement of measurements in Sector 13 & 14  design has been done – proto in weeks; offer arrived  Mimmo proposes to mount them on the chamber rails, design of MiniMAB fixation will come soon  necessary Caen 3006 PS already purchased Additional PG targets/redesign PG targets on MABs  holder prototype ready; order already sent out  survey of the external viewing possibilities done  next: starting to mount external Survey brackets for external Wheels  waiting for offer on targets (Antje) Bringing out BoardPCs from the gaps  long cable check in ISR done, result positive  waiting for Mimmo to measure cable length (needed for the cable order)  Mimmo needs to finalize the new BoardPC places

23. Zoltán Szillási (ATOMKI)Muon IB, November 29th, 2011 Long-term upgrade plans 23 Eliminate the single failure point caused by the single frame grabber card on the BoardPCs by changing the cameras to digital. Beside bringing the digitization to the individual cameras, this would allow parallel processing of data and better noise tolerance between the camera and the BoardPC. We also wondering on changing the BoardPCs themselves since the technology will be more than 10 years old by then and the spare part supply will probably either impossible or unmaintainably expensive. LS2 idea (not yet a proposal. First let’s get through LS1 ):

24. Zoltán Szillási (ATOMKI)Muon IB, November 29th, 2011 Issue with the HW EndCap Aligment System 24 (Hubert Gerwig, TIG, 2012.10.04) No more manpower for analysis on ME Transfer line might help in understanding the Barrel systematics Barrel is willing to participate in analysis, provided: We can understand the pending calibration issues Unfortunately, we don’t have resources for redesign + modify Transfer Plate is in conflict with ME4! Is the conclusion clear?

25. Yuriy Pakhotin (Texas A&M)Muon IB, November 29th, 2011 Back Up 25

26. Current Muon geometry was signed off in February 2011 Barrel alignment DT chambers aligned with respect to Tracker using 2011 collision data and track-based algorithm Tracker and Muon System relative alignment implemented as Global Position Record  only tracks in Barrel used, but Endcap and Barrel globally aligned Endcap alignment CSC chambers aligned with respect to each other using CSC overlaps algorithm with beam halo data collected in 2010 with several photogrammetry and SLM constraints  muons from collisions used to cross check result with beam-halo, same result within precision Endcap Rings aligned w.r.t. Tracker as rigid bodies  global movement and rotation in plane perpendicular to beam line Yuriy Pakhotin (Texas A&M)Muon IB, November 29th, 2011 Current Muon Alignment 26

27. Software release: CMSSW_5_3_6_patch1 Data Sample (2012 A+B re-reco): /SingleMu/Run2012A-MuAlCalIsolatedMu-13Jul2012-v1/ALCARECO /SingleMu/Run2012B-MuAlCalIsolatedMu-13Jul2012-v1/ALCARECO Input Tracker geometry: frontier://FrontierProd/CMS_COND_31X_ALIGNMENT TrackerAlignment_v9a_offline frontier://FrontierProd/CMS_COND_31X_ALIGNMENT TrackerAlignmentErrors_v3_offline frontier://FrontierProd/CMS_COND_310X_ALIGN TrackerSurfaceDeformations_v3_offline Input GPR and Muon geometry: This is starting geometry for Muon alignment iterative algorithm New GPR obtained with current Muon geometry and new Tracker Current Muon geometry from Global Tag GR_R_53_V16A  fully track-based Muon alignment signed off on March 2nd 2012 Yuriy Pakhotin (Texas A&M)AlCaDB Meeting, 27 November 2012 Updated Muon Alignment Workflow Conditions 27 Updated tracker

28. Yuriy Pakhotin (Texas A&M)AlCaDB Meeting, 27 November 2012 Muon Tracks Selection 28

29. Muon residual is difference between measured (with hits) and predicted (i.e. propagated from Tracker) position of the muon in the chamber Residuals calculated in chamber’s local frame local residual x = track local x – hit local x scattering in iron  width of residual distribution chamber misalignment  non-zero mean of distribution Yuriy Pakhotin (Texas A&M)AlCaDB Meeting, 27 November 2012 Muon Residuals 29

30. Yuriy Pakhotin (Texas A&M)AlCaDB Meeting, 27 November 2012 Residuals and aligned coordinates 30

31. Superlayer profiles example before and after δφ z SL1&3 corrections in a problematic chamber : Slopes of superlayers become very close Yuriy Pakhotin (Texas A&M)Muon IB, November 29th, 2011 DT Superlayer Misalignment 31 plot from Vadim Khotilovich (Texas A&M)