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LCLS LCLS-II Survey & Alignment. International Review for PAL-XFEL Survey & Alignment May 31, 2011 Catherine LeCocq SLAC Metrology Department. SLAC Site. From John Galayda LCLS-II DOE CD-1 Review April 26, 2011. A Five Step Process. Planning Information gathering

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lcls lcls ii survey alignment

LCLS LCLS-II Survey & Alignment

International Review for PAL-XFEL Survey & Alignment

May 31, 2011

Catherine LeCocq

SLAC Metrology Department

slide3

From John Galayda

LCLS-II DOE CD-1 Review

April 26, 2011

LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

a five step process
A Five Step Process
  • Planning
    • Information gathering

- Physics requirements

- Engineering interfaces

- Geodetic aspects

    • Simulation
  • Monument Network
  • Component Fiducialization
  • Installation
    • Girder Alignment (if applicable)
    • Component Alignment
    • Mapping
  • Operation Phase
    • Monitoring (if applicable)
    • Mapping and re-alignment

LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

slac instrumentation
SLAC Instrumentation
  • Primary Instrumentation:
    • Automatic Levels: Leica DNA03
    • Laser Trackers: FARO Xi (Leica AT401 to be acquired for LCLS-II)
    • In-house portable wire system
  • Accessories:
    • Bar code rods: 2 meters and 0.6 meters long
    • Tripods: Brunson heavy stands, Kara portable tooling stands
    • Survey targets: 1 ½” Corner Cube Reflectors (12 per laser tracker)
    • Field Data Collectors: Paravant and Allegro 
  • Additional Equipment:
    • Total Stations: Leica TC2002 and TDA5005
    • FARO platinum portable arms (4ft, 8ft, 12ft)
    • Gyrotheodolites: GYROMAT 2000
    • Optical Plummet: Wild NL
    • GPS Receivers: Leica SR-530
    • Laser Scanner: Z+F Imager 5006

LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

software model
Software Model
  • Parametric Model
    • l = observation vector
    • x = unknown (or parameter) vector
  • Stochastic Model
    • = variance-covariance matrix
    • = variance factor
  • Least Square Solution
  • Free Net Solution

LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

lcls i uh network simulation
LCLS-I UH Network Simulation
    • Tunnel dimensions: 130 m long, 5 m wide and 2 m high
  • Floor is 1.0 m below beamline, wall monuments are 0.75 m above beamline, laser tracker set-ups are 0.4 m and 0.6 m above beamline
  • 49 Points – 17 Laser Tracker Set-ups
  • sD = 30 μm sh = 30 μm / D sv =50 μm /D sdh = 50 μm

W23

sz = 22 μm sx = 47 μm sy =46 μm

LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

lcls i single total station set up

Single TC2002 Set-up

sD = 100 μm sh = 50 μm/D sv = 50 μm/D

“Plate15”

sz = 83 μm sx = 108 μm sy = 72 μm

LCLS-I Single Total Station Set-up

LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

monumentation network
Monumentation Network

LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

uh monumentation

1‘ stay-clear

wall monuments

(with removable spherical target)

6’

floor monument

(with removable spherical target)

UH Monumentation

See ESD 1.4-113 Undulator Tunnel Survey Monument Positions

LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

lcls i uh with lcls ii undulators
LCLS-I UH with LCLS-II Undulators

LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

observation schema
Observation Schema
  • Laser Tracker
    • Adapt observation scheme tested in simulation to real world
      • 3 triplets per point
    • Calibrate instrument
    • Follow observation guidance:
      • 1 triplet = 2 sets of direct and reverse
  • Precision Level
    • Adapt observation scheme tested in simulation to real world
      • Loop over floor points
    • Calibrate instrument and rod
    • Follow observation guidance:
      • 1 shot = average of 3 readings
  • Other
    • Total station
    • Nadir plummet
    • Gyrotheodolite
    • Portable wire

LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

lcls i network for uh installation
LCLS-I Network for UH Installation

LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

lcls i portable wire results
LCLS-I Portable Wire Results

Impact of wire on standard deviations

Impact of wire on coordinates

Network of 393 points with the following observation schema: triplets from 69 tracker setups, 465 height differences and 57 offset measurements to two overlapping wires (240m long and 370m long).

A-priori standard deviations:

Laser Tracker: sD=50 µm, sHz=70 µm/m, sV=100 µm/m

Level: sDh=70 µm

Offset measurement: sDo=30 µm

Extracted from IWAA08 Poster

LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

Network measurements alone

Wire measurements included

Coordinate change [µm]

Sigma [µm]

Position [m]

Position [m]

component fiducialization
Component Fiducialization
  • Advantage: repeatable references
  • Methodology: mechanical or magnetic
  • Tooling Choices: compatible with observation techniques in the field
  • Instrument:
    • CMM
    • Laser tracker
    • Optical tooling
    • Robotic arm
    • Photogrammetry

LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

mechanical fiducialization
Mechanical Fiducialization

LCLS-I Tweeter Quadrupole Magnet

LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

magnetic fiducialization
Magnetic Fiducialization

See LCLS-TN-05-11

LCLS-I Undulator

Quadrupole Magnet

  • Overall fiducialization accuracy in x and y < 25 µm
  • 3 Step Process:
    • Place wire at quadrupole center: 10 µm
    • Locate wire: 15 µm
    • Locate tooling balls: 10 µm

LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

undulator fiducilization
Undulator Fiducilization

From Zack Wolf & Georg Gassner

LCLS-II DOE CD-1 Review, April 26, 2011

LCLS-I Case: Pointed magnets with same sign poles are added to the ends of the undulator. These magnets have a well defined zero field point in the center. The distance from the measurement axis to the zero field point is determined. A calibration gives the distance from the zero field point to tooling balls on the pointed magnet fixture. The distance from the tooling balls on the pointed magnet fixture to tooling balls on the undulator is measured with a CMM.

LCLS-II Case: More fiducials, independent treatment of the jaws, Measurement with laser trackers. Expected accuracy: 30 to 50 μm

LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

girder alignment
Girder Alignment
  • Advantages:
    • Better relative component alignment
    • Speed up installation phase
  • Variations:
    • Individual component adjustment
    • Mover Mechanism:
      • Fixed
      • Remote
      • Feedback

LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

lcls i undulator girder
LCLS-I Undulator Girder

Extract from LCLS TN-08-03: Girder Alignment Plan

  • The Undulator Girder alignment was carried in 2 steps:
  • Pre alignment and all connection installation (wiring and plumbing in a staging area (see picture above)
  • Final alignment in a controlled temperature environment on a CMM

LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

lcls coordinate measuring machine
LCLS Coordinate Measuring Machine
  • Leitz Reference Model 45129 CMM manufactured in Wetzlar (Germany)
  • Weight capacity 3000 kg
  • Measuring range is 0.9 x 1.5 x 4.5 m
  • Resolution is 0.1 µm
  • Spatial accuracy formula in µm based on L, the length measured in mm: 2.0 + L/350.
  • After specific tuning for the undulator segment weight and location on the CMM, the expected accuracy for the undulator segment should be upgraded to: 1.5 + L/500.

LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

component alignment
Component Alignment
  • Timeline:
    • Template layout
    • Stand/base plate alignment
    • Component/girder alignment
  • Principle:
    • Solid monument network
    • Component fiducialization
    • Local instrument set-ups
  • Variations and possible difficulties come with the hardware installed:
    • Clearance around bolts
    • Mover system centered around their range
    • Component pre-set to nominal
    • Fiducial and mover in-line when possible
    • Right balance between fine and coarse thread

LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

example lcls i bth west
Example LCLS-I BTH West

LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

mapping phase
Mapping Phase
  • Observation scheme:
    • Identical to monument network
    • Including component fiducials
  • Computation phase:
    • Identical to monument network
    • Generating observed position and attitude (and their standard deviations) for each component
  • Move list
    • Option 1: to ideal
    • Option 2: to smooth line
  • The next 2 graphs show the as-built results for the 33 quadrupole magnets in the Undulator Hall in December 2008, right before the start of LCLS-I.

LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

slide25
LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

slide26
LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

linac laser alignment line
Linac Laser Alignment - Line

LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

linac laser alignment changes
Linac Laser Alignment - Changes

LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

lcls i measurement campaigns
LCLS-I Measurement Campaigns

LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

uh wall deformations
UH Wall Deformations

Both Undulator Hall and X-Ray Tunnel show slow shrinking of the tunnel walls relative to each other by <1mm/year

LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

floor deformations
Floor Deformations

LTU

UH

XRT

FEH

Dump

NEH

FEE

  • 3 mm initial floor deformation, correlated with earth backfill above dump area
  • Since July 08 deformation < 0.5 mm (~0.5 μm/day for largest deformation)

LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

lcls survey alignment timeline
LCLS Survey & Alignment Timeline

May 2010

May 2011

Feb 2004

May 2005

Nov 2007

Dec 2007

Jan 2008

Feb 2008

Mar 2008

Apr 2008

May 2008

Jun 2008

Jul 2008

Aug 2008

Sep 2008

Oct 2008

Nov 2008

Dec 2008

Monument

Template

LCLS-II

Stand / Plate

Outside Network

Component

Mapping / Move

LCLS-I e-beam Installation

Fiducialization

Girder Assembly

LCLS LCLS-II Survey & Alignment

Pohang Accelerator Laboratory, 05-31-2011

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