1 James N. Bellinger University of Wisconsin-Madison 15-March-2009 Hardware Alignment

2 Endcap Hardware Alignment Lasers + DCOPS Across disk face (nearly radial) Axial across disk rims Z sensors at disk rim Tiltmeters at disk rim Radial distance-meters between chambers Overlap w/ Link sensors on ME±1/2 chambers Z sensor between ME±1 and outer MAB

3 DCOPS Positions on SLM

4 Tilt-meters and R distance-meters Tilt-meters at rim Z-sensors at rim R distance-meters between chambers, transfer plate

5 Transfer Line Layout ME+4ME+3ME+2ME+1 ME12 ME-3ME-1 ME-4 YB+2YB+0YB-0YB-2 Laser

6 Purpose of Components X/Y/Z of chambers relative to Transfer Plates DCOPS Z measurement at Transfer Plates Plunger distance-meter and Ztube for YE to YE disk IR distance-meter and target for YE1 to MAB Inner radius and X/Y/Z for ME±1 Supplied by Link X/Y of Transfer Plates Provided by Transfer Line Radial shifts between rings of chambers Measured by radial distance-meters

7 Hardware Status 3 bad readout boards repaired (1%) Analog components (distance and tilt meters) working IR lasers covered for safety Transfer line laser control tested Dismounted selected DCOPS and Lasers Xiaofeng also is responsible for the LV controls

8 To Be Done After closing, remount interfered-with lasers and DCOPS Align Transfer Line lasers Bug was fixed which blocked Picomotor control

9 Alignment Action Program Create/verify geometry definition Identify good data Piecemeal fit to subsections Share fit info among subsections (esp. from Link) Refit w/ new geometry info “Big Bang” fit w/ everything? May not be needed

10 Available Endcap Subsystems’ Analyses Laser Lines for ME+2,3,4 ME-2,3,4 Chambers ME+1/2 Chambers ME+1/3 (not blessed yet) Z sensors for Endcaps Reliable information available Chamber Z centers Chamber Z tilts

11 DCOPS Fits Outline of DCOPS CCD 2 Lasers: 1 per side Fits for chamber surface ME+2/SLM2, Z measurements, B=0 Cocoa est. for chamber fit error is 250µ

12 DCOPS-Only from previous Blow-up view of just the DCOPS. There are two CCDs for each direction Each DCOPS has 2 CCDs measuring Z. Most error bars are invisibly small Most fits have RMS near 30 microns

13 Chamber surface estimates Red=Real Green=Sim MAB ASPD ME12 ASPD ASPD P4 Distancemeter and dists IR target DCOPS dowels Animated ME+1 Half-SLM DCOPS Inner Link MAB dist

14 Muon Endcap Hardware Alignment Preliminary z global r global CMS Side view             Nominal CSC position              x = 0 Nominal CSC position Not to scale     Pink: Aligned by Tracker-Muon Link system Blue: Aligned by Muon Endcap Optical System Red: Not aligned yet  x = 0 : 3.9mrad ME+1/3,2/2,3/2: Δz:- 5 mm to IP globally : mm : mm   nom. : mm   x > 1.3mrad : 5.94 mm  : mm : mm : mm : mm : mm : mm : 3.7mrad : 3.4mrad : 3.9mrad : 4.7mrad : 3.6mrad : 4.2mrad : 3.4mrad : 3.4mrad : 3.5mrad nom. : 4.4mrad : 4.4mrad ← Muon Endcap stations → ME+1 ME+2ME+3ME+4ME-1ME-2ME-4ME-3 ME-1/3,2/2,3/2: Δz:+ 5 mm to IP globally : -2.2 mm Green: Not blessed yet Z not to scale

15 In the pipeline 1.Relative X/Y information for Endcaps separately 2.Barrel muon 3.ME-1 4.Locate Endcap SLMs using relative X/Y info from step 1 5.Reconcile inclinometer data w/ laser line results 6.Proof of principle linking MAB with Endcaps via Transfer Lines

16 Hardware Problems we had Minus side Link Disks assembled such that components couldn’t talk to each other! Transfer Lines Disk assembly mismatches caused some shadowing Could not adjust all the laser directions (FIXED) 3% DCOPS missing (FIXED)

17 Order of Tasks for Endcap Independent validation of data quality in all detectors Stand-alone reconstruction of SLMs and Transfer Lines When Link results are available: Refit Big Bang fit to everything at once?

18 Close CMS Bi weekly MWGR weekly MWGR CRUZET S w & w/o tracker CRAFTS Adjust LD- LHC dev. collisions DT StandAlone  align Mar Apr May Jun Jul Aug Sep Oct Nov Dec Barrel HW Geom Endcap HW Geom Full B=3.8T AR vs. TK survey+tracks  r correction CSC align w/cosmics DT align with collision tracks CSC align with collision tracks Full Barrel HW B=3.8T Full Endcap HW B=3.8T Integrated HW 3.8T Integrated HW + track-based Geom Full Link 0T Full HW Geom 0T Full Endcap HW 0T Integrated HW 0T DT align with CRAFT2 cosmics CSC align with CRAFT2 cosmics G. Gomez Alignment work plan

19 Time Estimates If the disks are assembled with reasonable accuracy Then repeating the work with fresh data in May should be quick Delays result from having to sort out bad values Doing it again in August should be easier still

20 Automation of Fitting DCOPS data is not automatically migrated from Online to Offline – Only needs password file, re-test in new environment We still want human eyes on the data before we use it James N. Bellinger 2-March-2009

21 Remaining Projects Include Decide how to interpolate between fit chambers to reach non-instrumented ones Include tilt-meter results Fit using all the Transfer Lines Preliminary work shows agreement with photogrammetry in the Plus Endcap

22 Plus Endcap DCOPS relative displacements Vectors plotted to show dX Ring diameter is not relevant Largest vector has length given in the title Vectors at center average the rest, to estimate disk displacement From PG Zrot: ±.7 mm ±.7 mm ±.7 mm ±.7 mm

23 Prospects Confident we’ll have good (to 250µ or better) fits for Endcap positions next summer Confident we’ll be able to link Plus and Minus Endcap positions Link system has been quite quick getting results Encouraging results from the Barrel