Undulator Metrology Catherine LeCocq, SLAC October 27, 2005

1October 27-28, 2005 FAC MeetingUndulator Metrology

Catherine LeCocq, [email protected]@slac.stanford.edu

Undulator MetrologyCatherine LeCocq, SLAC

October 27, 2005

Support Undulator Hall ConstructionDevelop and Test Fiducialization ProceduresDevelop and Test Monitoring SystemsPlan Assembly of GirdersPlan Tunnel Installation SequenceAlignment Possibilities after Installation



Coordinate SystemsNAD83-State Plane Coordinate System (SPCS-CA Lambert Zone 3 or 0403), see AEG web page: http://wwwgroup.slac.stanford.edu/met/Align/LCLS/LCLS.htmlESD 1.9-106 (Catherine LeCocq) - Height Systems for LCLS Construction

Outside MonumentationESD 1.9-107 (Brian Fuss) - LCLS Alignment Construction Requirements

InstrumentationGPS/RTK using SLAC base stationTotal StationsAutomatic Levels

Support Undulator Hall Construction

http://wwwgroup.slac.stanford.edu/met/Align/LCLS/LCLS.html

http://wwwgroup.slac.stanford.edu/met/Align/LCLS/LCLS.html



Undulator“Undulator Tuning Procedure”, by Zack Wolf“Undulator Fiducialization Procedure”, by Yurii Levashov

Quadrupole“Quadrupole Fiducialization Procedure”, by Zack Wolf

Beam Finder Wire“BFW Fiducialization Procedure”, by Zack Wolf and Eric Lundahl

Fiducialization Procedures

See “Undulator Alignment and Motion” Internal Review, October 20-21, 2005



Bench Set-up for Undulator Tuning

Extract from Yurii Levashov:1. Alignment to the bench. First step - by

conventional tools (±0.2mm); second with the use of capacitor sensors (±10µm). Reference plates for initial alignment to the bench and as capacitor sensor home positions (ordered).

2. Hall probe measurements to find magnetic axis, i.e. magnetic reference (±5µm random error).

3. Coordinate transfer from magnetic to mechanical references. Pointed magnets as intermediate reference.



Vibrating Wire System under Construction

Extract from Zack Wolf:

A quadrupole will be centered on a wire to 10 microns.

The wire will be located relative to tooling balls to 15 microns.

All tooling balls will be located to 10 microns.

The overall accuracy in x and y will be better than 25 microns.

The magnet pitch and yaw will be smaller than 1 mrad.



Loose End: BFW Solution

Out:The beam goes through a small beampipe making a smooth transition to external beampipes

In:Wires are inserted into the beamline. The whole girder is moved to scan the wires across the beam.

Fiducialization Steps:1) Locate wire relative to local

fiducials (optically): 25 um2) Locate local fiducials relative

to outside tooling balls (CMM): 15 um

Extract from Zack Wolf

PRD 1.4-004Repeatability of positioning wires: 80 um in X, 30 um in Y

QuadUndulatorBFW



Construction: SLAC Bldg 81LCLS-TN-04-1 (SLAC-TN-05-020, February 2005): "Requirements for the Construction of the LCLS Magnetic Measurements Laboratory“, Z Wolf & R. Ruland.

PRD 1.4-002: "Magnetic Measurements Facility Requirements“, R. Ruland & Z. Wolf.Breakout Session 4 at 3:45PM: “Magnet Measurement Facility Status”, J. Sevilla.

SpecificationLCLS-TN-04-8 (SLAC-TN-05-017, August 2004): "Requirement for the LCLS Undulator Magnetic Measurement Bench“, Z Wolf.

LCLS Magnetic Measurement Facility (MMF)

http://www-ssrl.slac.stanford.edu/lcls/technotes/LCLS-TN-04-1.pdf

http://www-ssrl.slac.stanford.edu/lcls/technotes/LCLS-TN-04-8.pdf



Leitz Reference Model 45129 CMM manufactured in Wetzlar (Germany) is on order and should arrive mid February.Up to now, the 3 cranes in MMF are still rated @ 2000 kg.CMM weight capacity is now 3000 kg. The original order requested only 2250 kg. CMM measuring range is 0.9 x 1.5 x 4.5 meters.CMM resolution is 0.1 microns or 0.000004 inches.CMM spatial accuracy is a formula based on L, the length measured in mm: 2.0 microns + L/350.There will be some special machine tuning @ the manufacturers site in Germany in December. Machine will be tuned for the undulator segment weight and location on the CMM. After tuning, the expected accuracy for the undulator segment should be upgraded to: 1.5 microns + L/500.

Some MMF Facts and Updates

Prepared by Eric Lundahl



Two wires (one above the other), stretched along the entire Undulator

Four wire position monitors will be installed on each of the 33 girders.The system monitors X-pos, Y-pos, Pitch, Yaw and Roll with respect to the two wires on a sub-micrometer scale and continuously over time. A system performance test is under operation at SLAC in a real set up with two 30 meter wires and 14 Wire Position Monitors. The results are encouraging e.g. Readout resolution < 100 nanometer.

Monitoring System: WPS

1

A BReference Reference

33

Prepared by Franz Peters



Long distance wire R & DUntil now, WPS was operated with wires up to 60 meter length.Parameter, like signal attenuation or transversal wire oscillation frequency varies with the length of the wire. A new set up with one roughly 130 meter long wire is now installed and first measurements were done.

Engineering and Integration of WPS into the Undulator systemUpcoming, final layout of the girder reflects to mechanical components of WPS and needs redesign of some interface components.Connection of Quadrupole, BPM or BFW with WPS is under review.Electronic Sub-stations of WPS and the distribution at the Undulator hall is designed.

Monitoring System: WPS Studies

Prepared by Franz Peters



Extensive Tests of the Sensors and HLS.

Identifying error sources and developing solutions for them.Dielectric constant () of water is not stable – routine calibrationBiased readings at some points – new DC-DC converterInfluence of temperature differences – half filled pipe system

– correction for pot expansion – corrections for change

Earth Tides – computation of a model

During the stay of the Engineers from BINP (Novosibirsk) the sensors have been tested and the last changes have been decided.First articles have been ordered and will arrive in January.

Monitoring System: HLS

Prepared by Georg Gassner



Three capacitive and one ultrasonic sensors per girderReliable determination of height, roll and pitchAbsolute measurementsCalibration of the systemControlled measurements

2 inch stainless steel pipes to connect the pots for optimal damping and maintenance

All sensors are connected with TCP/IP (IEEE 802.3af)Following a standard (off the shelf products)Power supply includedEach sensor communicates independently from all others

Monitoring System: HLS-Girder Integration

Prepared by Georg Gassner



PrerequisiteAll necessary components fiducializedStands aligned in all staging areas

Outside MMF (possibly in Building 750) following the SPEAR3 Approach as suggested by Richard M. Boyce

Station 1 Prepare Girder: Mount CAM wedges under girderStation 2 Component Installation, part 1

roll-away slides, component supports HLS & WPM components undulator vacuum chamber

Station 3 Component Installation, part 2 quadrupole, BFW and BPM

Station 4 Wiring / Plumbing

In the Controlled Environment of the MMF Station 1 Optical Alignment Station 2 CMM

Storage

Girder Assembly



Gather all fiducial data and perform tunnel network designInstall tunnel monuments (floor and wall)Survey tunnel networkMark floor for anchorsAlign floor platesRe-survey tunnel networkAlign girder standsSurvey girders

Tunnel Installation

ANL Model



Tunnel Network Simulation (LEGO/SIMS)

W23 sz = 22 μm sx = 47 μm sy =46 μm

49 Points – 17 Laser Tracker Set-upssD = 30 μm sh = 30 μm / D sv =50 μm /D sdh = 50 μm



Loose End ProblemMonitoring System CalibrationIntra Girder Alignment Verification

Alignment after Installation



End of Presentation

Documents

Undulator Metrology Catherine LeCocq, SLAC October 27, 2005