Installation Alignment, Magnetic Measurements and Fiducialization Robert Ruland

1
Installation Alignment, Magnetic Measurements and
FiducializationRobert 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

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Organization
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Undulator Alignment Tolerance

• Undulator
• The measured values for Keff shall be within
  0.0005 (i.e., 0.015) of the design
  values(LCLS Undulator Requirements PRD 1.4
  001)
• 1.510-4 correlates to 70 µm in Y, about 180 µm
  in X
• Quadrupoles
• 3 µm in X and Y over 140 m
• Ab-initio alignment for BBA 150 µm, desired 80 µm

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Alignment Approach

• Global alignment of 70 µm very tough
• Instead will use BBA quads as alignment
  references for undulator segments
• Quadrupole and undulator segments are rigidly
  coupled by cradle mounting system, undulator
  segments follow quads
• BBA will align quad undulator segment units to
  3 µm level over undulator system length
• 70 µm tolerance is reduced from global (140 m
  length) to relative (cradle)
• Relative alignment can be done on CMM in MMF

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Undulator to Quad Tolerance Budget
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Ab-initio Alignment

• Conventional alignment methods, Total Station,
  Laser Tracker, Digital Leveling yields 200 µm
• Adding additional observations should yield
  position uncertainty of less than 100 µm
• Absolute measuring hydrostatic level measurements
  (ultra-sound sensor)
• Absolute measuring stretched wire measurements
  (optical wire detection)

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Installation Alignment Workflow

• Will use standard installation alignment
  approach. Requirement All components use
  registration features to preserve pre-alignment
• Install and measure alignment network
• Install floor anchors and foot plates
• Align foot plates to better than 0.5 mm
• Install granite tables onto foot plates
• Re-measure alignment network
• Align undulator mechanical supports and cams of
  mover system
• Install cradles
• Install Monitoring System HLS and WPM
• Align Cradles
• Straightness measurements Alignment Stretched
  Wire System, Portable HLS
• Align Cradles

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LCLS Magnet Measurements Facility

• Proposed Location Bldg 81, about 0.8 km away
  from tunnel
• Sufficient power for HVAC test equipment
• Ground motion and vibration measurements did not
  indicate potential problems
• Manageable space constraints
• Construction Schedule
• T1 Aug 04 (Engineering)
• T2 Dec 04 (Final Construction Drawings)
• T3 May 05 (Construction Start)
• Beneficial Occupancy February 2006

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Layout

• Floor 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

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MMF Set-up

• Assembly
• Cradle Assembly Bench
• Vacuum Chamber Alignment BenchGranite table with
  Height Gauge
• Undulator Segment / Cradle Storage
• At least 2 Und. Segments in MM lab (0.1º C)
• At least 2 Und. Segments in FA lab (1º C)
• 8 Cradles, quads, BPMs, Vacuum chamber and misc.
  supports in FA lab (1º C)
• About 20 undulator segments / cradles in storage
  area (2.5º C)

• Magnetic Measurements
• Undulator Test Bench 1 (8 m)final gap setting,
  final tuning
• Undulator Test Bench 2 (4 m)
  existingprototyping procedures, software
  development, initial gap setting
• Hall Probe Calibration SystemTest magnet and NMR
  system
• Quad Integrated Field Strength BenchStretched
  Wire
• Quadrupole Fiducialization PlatformVibrating
  Wire
• Pointed-Magnet Fixture Calibration Bench
• Fiducialization Assembly
• Fiducialization CMM 4.5 m
• Quadrupole Fiducialization PlatformVibrating
  Wire mounted on CMM
• BPM, Diagnostics Fiducialization

Magnetic Measurements Facility Requirements, PRD
1.4 - 002
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Undulator Test Bench Status

• 8m Magnetic Measurements Test Bench (MMTB)
  Implementation Schedule
• Evaluating RFP responses
• Award expected for early May
• delivery to coincide with MMF BO in Febr. 06
• Installation, commissioning, MMF ready for
  measurements 5/30/06
• Are using 5m bench obtained from APS for
  developing procedures and software (bench is
  being outfitted with equivalent hardware as 8m
  bench.
• Will be using 5m bench for preliminary gap
  setting during production

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Undulator Fiducialization Cradle Alignment

• Will use Coordinate Measurement Machine (CMM) for
  mechanical fiducialization measurements and
  alignment of components on cradle
• Specs
• 2µm L/350 accuracy,
• 4.5m x 1.2m x 1.0m volume
• Min 1500kg load capacity
• RFP being issued, due mid May
• Award expected for early June
• Delivery to coincide with BO of MMF

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Undulator Fiducialization Status

• Proposed Method Pointed Magnet Fixture
• Step 1 measure offset between undulator axis
  and pointed-magnet reference fixture on MM Bench
• Step 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

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Quadrupole Fiducialization Status

• Finding the axis
• Will use Vibrating Wire prototype set-up. It
  promises better yaw and pitch resolution than
  pulsed wire. Implementation based on setup by Dr.
  Temnykh from Cornell
• Completed prototype setup for permanent magnets.
  Routinely achieved repeatabilities even in
  environment with wide temperature swings of
  better than 5 µm
• Test stand being re-designed for electro magnets
• Transfer onto quadrupole fiducials
• Use Wire Finders (developed for VISA) to locate
  wire and reference to its tooling balls
• Use 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

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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
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Hydrostatic Level System
3rd generation sensors with Improved
stability Changed interface from RS485 to TCP/IP
over 10BaseT with POIP
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HLS Stability and Resolution
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Stretched Wire system
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WPM Stability and Resolution
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END of Presentation