Installation Alignment, Magnetic Measurements and Fiducialization Robert Ruland. Organization Installation Alignment Error Budget Ab-initio Alignment for BBA Conventional Global Straightness Magnetic Measurements Status of Magnetic Measurements Facility (MMF) - PowerPoint PPT Presentation
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Robert Ruland Installation Alignment -Magnetic Measurements – Fiducialization [email protected]April 7-8, 2005 FAC Meeting 1 Installation Alignment, Magnetic Measurements and Fiducialization Robert Ruland Organization Installation Alignment Error Budget Ab-initio Alignment for BBA Conventional Global Straightness Magnetic Measurements Status of Magnetic Measurements Facility (MMF) Location, Construction Schedule Lay-out Test Bench Acquisition Status Test Stands Development Status Fiducialization Pointed Magnet Fixture Development CMM Acquisition Status Monitoring Systems
UndulatorThe measured values for Keff shall be within ± 0.0005 (i.e., ± 0.015%) of the design values(LCLS Undulator Requirements PRD 1.4 – 001)1.5*10-4 correlates to 70 µm in Y, about 180 µm in X
Quadrupoles3 µm in X and Y over ~140 mAb-initio alignment for BBA ~150 µm, desired 80 µm
Conventional alignment methods, Total Station, Laser Tracker, Digital Leveling yields ~200 µmAdding additional observations should yield position uncertainty of less than 100 µm
LayoutFloor plan divided into three functional areas
Magnetic Measurements (± 0.1º C)Fiducialization and Assembly (± 1º C)Storage (± 2.5º C)
Full set of specs: LCLS-TN-04-1 Z. Wolf, R. Ruland, "Requirements for the Construction of the LCLS Magnetic Measurements Laboratory“.Test stand lay-out is driven by requirement to match the Earth Magnetic Field conditions in lab to Undulator Hall, i.e. azimuth and gap orientation need to be identical
Magnetic MeasurementsUndulator Test Bench #1 (8 m)final gap setting, final tuningUndulator Test Bench #2 (4 m) – existingprototyping procedures, software development, initial gap settingHall Probe Calibration SystemTest magnet and NMR systemQuad Integrated Field Strength BenchStretched WireQuadrupole Fiducialization PlatformVibrating WirePointed-Magnet Fixture Calibration Bench
Step 1: measure offset between undulator axis and pointed-magnet reference fixture on MM BenchStep 2: Measure pointed-magnet reference fixture wrt undulator fiducials on CMM
Test measurements show an accuracy of 10 µm in X and 5 µm in Y
See LCLS-TN-05-10 Y. Levashov and Z. Wolf, “Tests of coordinate transfer from magnetic to mechanical reference for LCLS undulator fiducialization”, in preparation
Finding the axisWill use Vibrating Wire prototype set-up. It promises better yaw and pitch resolution than pulsed wire. Implementation based on setup by Dr. Temnykh from CornellCompleted prototype setup for permanent magnets. Routinely achieved repeatabilities even in environment with wide temperature swings of better than 5 µmTest stand being re-designed for electro magnets
Transfer onto quadrupole fiducialsUse Wire Finders (developed for VISA) to locate wire and reference to its tooling ballsUse Coordinate Measurement Machine (CMM) to transfer information from WF to Quad fiducials.Vibrating Wire system will be mounted onto optical table which can be set-up on undulator fiducialization CMM
Integrating Monitoring Systems into Cradle / Support System
Since the cradle needs to be easily removable, we cannot attach the monitoring systems to it. Hence, both WPM and HLS need to be mounted to support table. However, the mounting has to be accomplish in a way which will force the sensors to follow the cradle motion
