US CMS DOE/NSF Review: May 8-10, Endcap Alignment Dick Loveless DOE/NSF Review 9 May 2001

US CMS DOE/NSF Review: May 8-10, Progress since Apr ‘00 Mechanical layout Alignment sensors -- DCOPS Uses CCDs and a cross-hair laser ISR Alignment Test - summer ‘00 First realistic test of hardware and software Engineering Design Review - Nov ‘00 Approval for alignment h/w on chambers Developments in readout and DAQ COCOA simulation Alignment tests in ‘01

US CMS DOE/NSF Review: May 8-10, Alignment design CSC alignment Precise relationship of strips, alignment pins, and sensors on CSCs Precise location of sensors on CSCs using internal calibrations and photogrammetry Radial measurements from transfer plate to CSCs by potentiometers Transfer plate location Axial lines monitor location wrt tracker co-ords Z distance measured by mechanical tubes and optical gap sensors Cross check using photogrammetry

US CMS DOE/NSF Review: May 8-10, Layout Basically finished SLM and axial lines integrated into endcap drawings - no conflicts Agreement with Link & Barrel groups on interfaces Drawings Most drawings finished, need some minor changes to match the sensor design Z tube drawings not finished Still need a MAB design (CERN responsibility) Mechanical Progress

US CMS DOE/NSF Review: May 8-10, SLM profile view

US CMS DOE/NSF Review: May 8-10, Sensor technology Design requirement for our system Many (up to 10) sensors in a line must all be capable of locating the laser beam Present transparent sensors are not transparent enough and projected developments do not match our schedule Design “standard tech” sensor Develop design using conventional items (relatively low risk) 4 linear CCDs mounted in a window frame Cross-hair laser beam Readout with DSP processor and serial I/O Digital CCD optical position sensor (DCOPS)

US CMS DOE/NSF Review: May 8-10, DCOPS sensor box 64mm x 64mm Al box with black anodizing 4 CCD arrays mounted at right angles to laser Red wedge filters on face of CCDs - bidirectional Standard mounting configuration

US CMS DOE/NSF Review: May 8-10, DCOPS Test Plans Goal Develop final DCOPS by end of ‘01 Understand calibration requirements and techniques Prototypes Building 25 prototype DCOPS sensors Fermilab is setting up an SLM line with DCOPS Northeastern will test calibration procedures Realistic testing Reliability of components (red filters, ND filters, electronics, etc.) DAQ system Reconstruction algorithms

US CMS DOE/NSF Review: May 8-10, June - Sept 2000 at CERN ISR Tunnel Goal : Setup and monitor “chambers” with resolution of  < 200  m Demonstrate System Redundancy Test Setup : 1 SLM Line (2 Laser Redundancy) 1 Transfer Line (Single Laser) 1 Transfer Plate Analog Sensors (Temp, Proximity) ISR Prototype System Test ISR Prototype System Test

US CMS DOE/NSF Review: May 8-10, ISR Prototype System Test Data Analysis : Events Reconstructed 3 Test Periods (July, Aug, Sept 2000) New Analysis Software : Prototype Reconstruction Software Used CMS Object oriented Code for Optical Alignment (COCOA) Our Expectations : Laser Position or Direction Will Not Matter Only Small Fluctuations in ISR System

US CMS DOE/NSF Review: May 8-10, ISR Test Layout

US CMS DOE/NSF Review: May 8-10, ISR Test Geometry Sensor locations for et2, et3, and es10 are given by the photogrammetry survey es9 was used due to survey errors in es10 Transfer plate geometry was fixed by machining Sensors et1 and es1 were located on the transfer plate Provides link between Transfer and SLM lines Rotations of sensors are known within error limits of photogrammetry

US CMS DOE/NSF Review: May 8-10, ISR Test Reconstruction Final ISR Results of COCOA reconstruction for July/August and September runs using es9 as the final reference sensor

US CMS DOE/NSF Review: May 8-10, Comments on ISR Test Reconstruction Dominated By Survey Errors Estimated Survey Errors 60  m local  120  m global Errors in COCOA Reconstruction 220  m Systematic Errors  < 15  m Statistical Errors (1500 Events) General Remarks Good reconstruction requires all 4 CCDs on MABS and Transfer Plate SLM sensors 3 CCDs required for all other sensors Reconstruction is roughly independent of laser direction Reconstruction is independent of laser motions Laser ‘Jumps’ Do Not Affect Us

US CMS DOE/NSF Review: May 8-10, ISR Results Final Results : System  = 130  m Typical Reconstructions within 300  m of expected survey location Sensors outside 300  m range have understood errors

US CMS DOE/NSF Review: May 8-10, Eng. Design Rev -- Nov ‘00 1)Endorse the general muon alignment scheme 2)Request the Muon Alignment group to participate to the CMS Working Group that will define the  3 region including tubes reserved for the alignment system and laser boxes for the Link system. 3)Schedule an Electronic Systems Review (ESR) for the three systems (BMU, EMU, & Link) at the same time. 4)Make sure the alignment system can be run at zero field and nominal field. 5)Fix milestones for the selection of the 2D sensors in line with muon chamber manufacturing schedules. 6)Reorganize MAB project to make sure procurement can proceed at very beginning of )Proceed with the procurement of sensors and mounts to be attached to the muon chambers (BMU & EMU) together with the associated cameras. The committee recommends to:

US CMS DOE/NSF Review: May 8-10, Alignment tests ‘01 SLM - Fermilab Construct a compete SLM line using 10 new DCOPS sensors Verify filtering and attenuation designs Check out aperture solutions Develop final version of readout boards and services Program DSP to calculate the centroid for each sensor Develop final version of DAQ system (linux) Develop final version of COCOA reconstruction program

US CMS DOE/NSF Review: May 8-10, Action items ‘01 DCOPS Calibration Test procedures and reliability Production plans Quality assurance documentation Responsibility Calibration database Radiation testing of components Slow Control interface Databases Hardware Software Integration with CSC chambers - space/noise

US CMS DOE/NSF Review: May 8-10, Design Problem Magnetic field operation We need to operate the alignment system in both field-on and field-off modes Disks will deflect when field is on, possibly by 15mm DCOPS apertures are 25mm at best There may not be a line of sight good for both field- on and field-off operation Must find a solution

US CMS DOE/NSF Review: May 8-10, InstallationInstallation Components installed at CERN Island plates glued on just prior to CSC installation, begin in Oct ‘02 SLM lines (mounts, towers, transfer plates) installed after CSC station is complete, expect 1st station ready for alignment in spring ‘03 Services (power, readout lines, etc.) tested for each station After station is complete we do photogrammetry Axial components installed on each disk in SX5, some testing may be possible Axial lines complete only in UX5

US CMS DOE/NSF Review: May 8-10, COCOA Simulation Goals Create Model CMS EMU Alignment System DCOPS + Analog Sensors Integrate with Link and Barrel alignment Evaluate Intrinsic System Errors Chamber construction System design Evaluate System Performance Intrinsic Resolution Correlation of System Components Effects from component failure Provide ‘First Draft’ of Reconstruction Software Integration of Results into General Physics Simulation

US CMS DOE/NSF Review: May 8-10, Current Status (May 2001) Substantial Software Improvements Extraction of Component Data from Endcap Muon Production Drawings (Complete) SLM Lines and Endcap CSC Stations have been modeled COCOA Simulation ME2/3/4 COCOA ModelSimulated COCOA SLM Line

US CMS DOE/NSF Review: May 8-10, ConclusionConclusion Alignment system making reasonable progress toward a good design Still many tasks to complete Group is small but dedicated Next Eng. Design Rev Scheduled for end of ‘01 Design must be final Production plans must be ready