Beam-Based Alignment with New Parameters [email protected] Linac Coherent Light Source Stanford...

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LCLS Undulator Workshop, Oct. LCLS Undulator Workshop, Oct. 24, 2003 24, 2003 Paul Emma, SLAC Paul Emma, SLAC Beam-Based Alignment with New Parameters [email protected] [email protected] Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center Beam-Based Alignment with New Parameters Paul Emma, SLAC Oct. 24, 2003 Brief Review of Technique Brief Review of Technique Old Parameters Old Parameters New Parameters New Parameters Cub Horror Cub Horror LCLS LCLS
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Transcript of Beam-Based Alignment with New Parameters [email protected] Linac Coherent Light Source Stanford...

Page 1: Beam-Based Alignment with New Parameters Emma@SLAC.Stanford.edu Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator.

LCLS Undulator Workshop, Oct. 24, 2003LCLS Undulator Workshop, Oct. 24, 2003 Paul Emma, SLACPaul Emma, SLACBeam-Based Alignment with New Parameters [email protected]@SLAC.Stanford.edu

Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center

Beam-Based Alignment with New Parameters

Paul Emma, SLACOct. 24, 2003

Beam-Based Alignment with New Parameters

Paul Emma, SLACOct. 24, 2003

Brief Review of TechniqueBrief Review of Technique Old ParametersOld Parameters New ParametersNew Parameters Cub HorrorCub Horror

Brief Review of TechniqueBrief Review of Technique Old ParametersOld Parameters New ParametersNew Parameters Cub HorrorCub Horror

LCLSLCLS

Page 2: Beam-Based Alignment with New Parameters Emma@SLAC.Stanford.edu Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator.

LCLS Undulator Workshop, Oct. 24, 2003LCLS Undulator Workshop, Oct. 24, 2003 Paul Emma, SLACPaul Emma, SLACBeam-Based Alignment with New Parameters [email protected]@SLAC.Stanford.edu

Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center

The MethodThe Method

BPM readings, BPM readings, mmii, written as sum of upstream kicks , written as sum of upstream kicks ++ offset, offset, bbii

Kicks are sensitive to momentum, Kicks are sensitive to momentum, ppkk, while offsets, , while offsets, bbii, are not, are not

BPM readings, BPM readings, mmii, written as sum of upstream kicks , written as sum of upstream kicks ++ offset, offset, bbii

Kicks are sensitive to momentum, Kicks are sensitive to momentum, ppkk, while offsets, , while offsets, bbii, are not, are not

ss

bbii > 0 > 0

EE = 0 = 0

EE < 0 < 0quad offsets and/or pole errorsquad offsets and/or pole errors

iithth BPM BPM jj

Page 3: Beam-Based Alignment with New Parameters Emma@SLAC.Stanford.edu Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator.

LCLS Undulator Workshop, Oct. 24, 2003LCLS Undulator Workshop, Oct. 24, 2003 Paul Emma, SLACPaul Emma, SLACBeam-Based Alignment with New Parameters [email protected]@SLAC.Stanford.edu

Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center

Reference line defined by incoming Reference line defined by incoming xx00, , xx00 launch conditions launch conditionsReference line defined by incoming Reference line defined by incoming xx00, , xx00 launch conditions launch conditions

...The Method...The Method

1/1/pp

mmii

offset = bi

(15 GeV/c)(15 GeV/c)11 (7.0 GeV/c)(7.0 GeV/c)11 (4.5 GeV/c)(4.5 GeV/c)11pp

linear only if linear only if CCijij independent of independent of pp

Page 4: Beam-Based Alignment with New Parameters Emma@SLAC.Stanford.edu Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator.

LCLS Undulator Workshop, Oct. 24, 2003LCLS Undulator Workshop, Oct. 24, 2003 Paul Emma, SLACPaul Emma, SLACBeam-Based Alignment with New Parameters [email protected]@SLAC.Stanford.edu

Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center

Schematic layoutSchematic layout

~300 ~300 mm

UNDULATORUNDULATOR(122 m)(122 m)

LINACLINACbest final trajectorybest final trajectory

steering elementssteering elements

xx00xx00

initial incoming initial incoming launch errorlaunch error

Undulator misaligned w.r.t. linac axis with uncorrelated Undulator misaligned w.r.t. linac axis with uncorrelated and correlatedand correlated** (‘random walk’) component (‘random walk’) component

permanent magnet quad and permanent magnet quad and undulator polesundulator poles

* suggested by C. Adolphsen* suggested by C. Adolphsen

BPMsBPMsquadsquads

Page 5: Beam-Based Alignment with New Parameters Emma@SLAC.Stanford.edu Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator.

LCLS Undulator Workshop, Oct. 24, 2003LCLS Undulator Workshop, Oct. 24, 2003 Paul Emma, SLACPaul Emma, SLACBeam-Based Alignment with New Parameters [email protected]@SLAC.Stanford.edu

Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center

Possible Absolute TrajectoryPossible Absolute Trajectory

LINACLINAC

Beam is launched straight down undulator, with Beam is launched straight down undulator, with possible inconsequential kink at boundarypossible inconsequential kink at boundary

dispersion generated is insignificantdispersion generated is insignificant

Page 6: Beam-Based Alignment with New Parameters Emma@SLAC.Stanford.edu Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator.

LCLS Undulator Workshop, Oct. 24, 2003LCLS Undulator Workshop, Oct. 24, 2003 Paul Emma, SLACPaul Emma, SLACBeam-Based Alignment with New Parameters [email protected]@SLAC.Stanford.edu

Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center

Input errors used for simulationInput errors used for simulation

0.040.04

00 44

100100

100100

22

Page 7: Beam-Based Alignment with New Parameters Emma@SLAC.Stanford.edu Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator.

LCLS Undulator Workshop, Oct. 24, 2003LCLS Undulator Workshop, Oct. 24, 2003 Paul Emma, SLACPaul Emma, SLACBeam-Based Alignment with New Parameters [email protected]@SLAC.Stanford.edu

Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center

Natural Undulator Natural Undulator YY-Focusing Now Included-Focusing Now IncludedNatural Undulator Natural Undulator YY-Focusing Now Included-Focusing Now Included

Recently included Recently included natural focusingnatural focusing in in YY-plane-plane

No change if included in both No change if included in both simulationsimulation and and reconstructionreconstruction

Small change if not included in reconstruction (not shown)Small change if not included in reconstruction (not shown)

Thanks to H.-D. Nuhn, S. Reiche, J. Welch Thanks to H.-D. Nuhn, S. Reiche, J. Welch

Recently included Recently included natural focusingnatural focusing in in YY-plane-plane

No change if included in both No change if included in both simulationsimulation and and reconstructionreconstruction

Small change if not included in reconstruction (not shown)Small change if not included in reconstruction (not shown)

Thanks to H.-D. Nuhn, S. Reiche, J. Welch Thanks to H.-D. Nuhn, S. Reiche, J. Welch

Page 8: Beam-Based Alignment with New Parameters Emma@SLAC.Stanford.edu Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator.

LCLS Undulator Workshop, Oct. 24, 2003LCLS Undulator Workshop, Oct. 24, 2003 Paul Emma, SLACPaul Emma, SLACBeam-Based Alignment with New Parameters [email protected]@SLAC.Stanford.edu

Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center

Initial BPM and quad misalignments (w.r.t. linac axis)Initial BPM and quad misalignments (w.r.t. linac axis)

++ Quadrupole Quadrupole positionspositions

oo BPM BPM offsetsoffsets

quad positionsquad positions

BPM offsetsBPM offsetsNow launch Now launch beam through beam through undulatorundulator

Page 9: Beam-Based Alignment with New Parameters Emma@SLAC.Stanford.edu Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator.

LCLS Undulator Workshop, Oct. 24, 2003LCLS Undulator Workshop, Oct. 24, 2003 Paul Emma, SLACPaul Emma, SLACBeam-Based Alignment with New Parameters [email protected]@SLAC.Stanford.edu

Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center

Initial trajectory before any correction appliedInitial trajectory before any correction applied

++ Quadrupole Quadrupole positionspositions

oo BPM BPM readbackreadback

ee trajectory trajectory

‘‘real’ trajectoryreal’ trajectory

quad positionsquad positionsBPM readingsBPM readings

Page 10: Beam-Based Alignment with New Parameters Emma@SLAC.Stanford.edu Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator.

LCLS Undulator Workshop, Oct. 24, 2003LCLS Undulator Workshop, Oct. 24, 2003 Paul Emma, SLACPaul Emma, SLACBeam-Based Alignment with New Parameters [email protected]@SLAC.Stanford.edu

Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center

After 3rd pass of BBA with old parameters (14.3 GeV)After 3rd pass of BBA with old parameters (14.3 GeV)

++ Quadrupole Quadrupole positionspositions

oo BPM readback BPM readback

ee trajectory trajectory

RON RON (FEL-code) (FEL-code) simulation shows simulation shows LLsatsat increased by increased by

<1 gain-length;<1 gain-length;R. Dejus, R. Dejus, N.VinokurovN.Vinokurov

300°300° 300°300°

xx 7 7 mmxx 7 7 mm

yy 6 6 mmyy 6 6 mm

rms beam size: rms beam size: 28 28 mm

Page 11: Beam-Based Alignment with New Parameters Emma@SLAC.Stanford.edu Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator.

LCLS Undulator Workshop, Oct. 24, 2003LCLS Undulator Workshop, Oct. 24, 2003 Paul Emma, SLACPaul Emma, SLACBeam-Based Alignment with New Parameters [email protected]@SLAC.Stanford.edu

Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center

After 3rd pass of BBA with new parametersAfter 3rd pass of BBA with new parameters

++ Quadrupole Quadrupole positionspositions

oo BPM readback BPM readback

ee trajectory trajectory

73°73° 73°73°xx 2.6 2.6 mmxx 2.6 2.6 mm

yy 2.7 2.7 mmyy 2.7 2.7 mm

rms beam size: rms beam size: 33 33 mm

14 – 7.0 – 4.5 GeV14 – 7.0 – 4.5 GeV

Page 12: Beam-Based Alignment with New Parameters Emma@SLAC.Stanford.edu Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator.

LCLS Undulator Workshop, Oct. 24, 2003LCLS Undulator Workshop, Oct. 24, 2003 Paul Emma, SLACPaul Emma, SLACBeam-Based Alignment with New Parameters [email protected]@SLAC.Stanford.edu

Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center

Now try 2-times worse initial random misalignmentsNow try 2-times worse initial random misalignments

++ Quadrupole Quadrupole positionspositions

oo BPM BPM offsetsoffsets

quad positionsquad positions

BPM offsetsBPM offsets 2-2-mm BPM BPM resolution + resolution + 100-100-mm initial initial BPM & quad BPM & quad offsets + offsets + 2-2-mm mover mover backlashbacklash

Page 13: Beam-Based Alignment with New Parameters Emma@SLAC.Stanford.edu Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator.

LCLS Undulator Workshop, Oct. 24, 2003LCLS Undulator Workshop, Oct. 24, 2003 Paul Emma, SLACPaul Emma, SLACBeam-Based Alignment with New Parameters [email protected]@SLAC.Stanford.edu

Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center

After 3rd pass , new parameters, combined ‘worst case’After 3rd pass , new parameters, combined ‘worst case’

2-2-mm BPM BPM resolution + resolution + 100-100-mm initial initial BPM & quad BPM & quad offsets + offsets + 2-2-mm mover mover backlashbacklash

184°184° 184°184°

xx 4.9 4.9 mmxx 4.9 4.9 mm

yy 6.0 6.0 mmyy 6.0 6.0 mm

Page 14: Beam-Based Alignment with New Parameters Emma@SLAC.Stanford.edu Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator.

LCLS Undulator Workshop, Oct. 24, 2003LCLS Undulator Workshop, Oct. 24, 2003 Paul Emma, SLACPaul Emma, SLACBeam-Based Alignment with New Parameters [email protected]@SLAC.Stanford.edu

Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center

Run BBA on 25 Random ‘worst case’ SeedsRun BBA on 25 Random ‘worst case’ Seeds

2-2-mm BPM BPM resolution + resolution + 100-100-mm initial initial BPM & quad BPM & quad offsets + offsets + 2-2-mm mover mover backlashbacklash

Final Final XX-trajectories-trajectories

Final Final YY-trajectories-trajectories

Page 15: Beam-Based Alignment with New Parameters Emma@SLAC.Stanford.edu Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator.

LCLS Undulator Workshop, Oct. 24, 2003LCLS Undulator Workshop, Oct. 24, 2003 Paul Emma, SLACPaul Emma, SLACBeam-Based Alignment with New Parameters [email protected]@SLAC.Stanford.edu

Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center

Run BBA on 25 Different Random ‘Worst-Case’ SeedsRun BBA on 25 Different Random ‘Worst-Case’ Seeds

2-2-mm BPM BPM resolution + resolution + 100-100-mm initial initial BPM & quad BPM & quad offsets + offsets + 2-2-mm mover mover backlashbacklash

Final Final XX-mover settings-mover settings

Final Final YY-mover settings-mover settingswider mover wider mover range at end due range at end due to lack of BPMs to lack of BPMs after undulatorafter undulator

Page 16: Beam-Based Alignment with New Parameters Emma@SLAC.Stanford.edu Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator.

LCLS Undulator Workshop, Oct. 24, 2003LCLS Undulator Workshop, Oct. 24, 2003 Paul Emma, SLACPaul Emma, SLACBeam-Based Alignment with New Parameters [email protected]@SLAC.Stanford.edu

Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center

Run BBA on 25 Different Random ‘Worst-Case’ SeedsRun BBA on 25 Different Random ‘Worst-Case’ Seeds

2-2-mm BPM BPM resolution + resolution + 100-100-mm initial initial BPM & quad BPM & quad offsets + offsets + 2-2-mm mover mover backlashbacklash

xx,,yyxx & & yy mover mover distrib.distrib.

Page 17: Beam-Based Alignment with New Parameters Emma@SLAC.Stanford.edu Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator.

LCLS Undulator Workshop, Oct. 24, 2003LCLS Undulator Workshop, Oct. 24, 2003 Paul Emma, SLACPaul Emma, SLACBeam-Based Alignment with New Parameters [email protected]@SLAC.Stanford.edu

Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center

Evaluation of BBA Simulation Results (old parameters)Evaluation of BBA Simulation Results (old parameters)

Trajectory (BBA & Genesis)Trajectory (BBA & Genesis) PPsatsat and and LLsatsat vs BPM res. vs BPM res.

B. Fawley, H.-D. Nuhn, S. Reiche, PEB. Fawley, H.-D. Nuhn, S. Reiche, PE

Page 18: Beam-Based Alignment with New Parameters Emma@SLAC.Stanford.edu Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator.

LCLS Undulator Workshop, Oct. 24, 2003LCLS Undulator Workshop, Oct. 24, 2003 Paul Emma, SLACPaul Emma, SLACBeam-Based Alignment with New Parameters [email protected]@SLAC.Stanford.edu

Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center

SummarySummary

BPMs resolve trajectory to <2 BPMs resolve trajectory to <2 m rmsm rms

BPM readings ‘drift’ <2 BPM readings ‘drift’ <2 m over 1-2 hr (temperature)m over 1-2 hr (temperature)

Quad movers settable to better than Quad movers settable to better than 22 m, or small steering m, or small steering coils for final correctioncoils for final correction

BPM readings are not sensitive to variable beam size, etc.BPM readings are not sensitive to variable beam size, etc.

Trajectory is stable enough to <20% of beam size (already Trajectory is stable enough to <20% of beam size (already demonstrated in FFTB)demonstrated in FFTB)

Kerry Wood pitches no-hitter in openerKerry Wood pitches no-hitter in opener

BPMs resolve trajectory to <2 BPMs resolve trajectory to <2 m rmsm rms

BPM readings ‘drift’ <2 BPM readings ‘drift’ <2 m over 1-2 hr (temperature)m over 1-2 hr (temperature)

Quad movers settable to better than Quad movers settable to better than 22 m, or small steering m, or small steering coils for final correctioncoils for final correction

BPM readings are not sensitive to variable beam size, etc.BPM readings are not sensitive to variable beam size, etc.

Trajectory is stable enough to <20% of beam size (already Trajectory is stable enough to <20% of beam size (already demonstrated in FFTB)demonstrated in FFTB)

Kerry Wood pitches no-hitter in openerKerry Wood pitches no-hitter in opener

For new parameters:For new parameters: Alignment can be achieved at Alignment can be achieved at adequate level using beam-based technique, given that…adequate level using beam-based technique, given that…

LCLSLCLS

Page 19: Beam-Based Alignment with New Parameters Emma@SLAC.Stanford.edu Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator.

LCLS Undulator Workshop, Oct. 24, 2003LCLS Undulator Workshop, Oct. 24, 2003 Paul Emma, SLACPaul Emma, SLACBeam-Based Alignment with New Parameters [email protected]@SLAC.Stanford.edu

Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center

Reserve SlidesReserve Slides

Next slides are in reserve for questionsNext slides are in reserve for questionsNext slides are in reserve for questionsNext slides are in reserve for questions

Page 20: Beam-Based Alignment with New Parameters Emma@SLAC.Stanford.edu Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator.

LCLS Undulator Workshop, Oct. 24, 2003LCLS Undulator Workshop, Oct. 24, 2003 Paul Emma, SLACPaul Emma, SLACBeam-Based Alignment with New Parameters [email protected]@SLAC.Stanford.edu

Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center

Add 10-m random BPM offsets and correct trajectoryAdd 10-m random BPM offsets and correct trajectory

++ Quadrupole Quadrupole positionspositions

oo BPM readback BPM readback

ee trajectory trajectory

113°113° 113°113°

(old parameters)(old parameters)

Page 21: Beam-Based Alignment with New Parameters Emma@SLAC.Stanford.edu Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator.

LCLS Undulator Workshop, Oct. 24, 2003LCLS Undulator Workshop, Oct. 24, 2003 Paul Emma, SLACPaul Emma, SLACBeam-Based Alignment with New Parameters [email protected]@SLAC.Stanford.edu

Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center

Wait 2 weeks, allow 3 bad BPMs, and 2 moved quadsWait 2 weeks, allow 3 bad BPMs, and 2 moved quads

++ Quadrupole Quadrupole positionspositions

oo BPM readback BPM readback

ee trajectory trajectory

1137°1137° 1137°1137°2 weeks of ‘ATL’ 2 weeks of ‘ATL’ diffusive ground diffusive ground motionmotion3 BPM offsets drift 3 BPM offsets drift by 20 by 20 mm2 quads moved by 2 quads moved by 20 20 mm

22 = = AA··TT··LL, 2 , 2 m at m at TT = 2 wk, = 2 wk, LL = 3.5 = 3.5 mm

(old parameters)(old parameters)

Page 22: Beam-Based Alignment with New Parameters Emma@SLAC.Stanford.edu Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator.

LCLS Undulator Workshop, Oct. 24, 2003LCLS Undulator Workshop, Oct. 24, 2003 Paul Emma, SLACPaul Emma, SLACBeam-Based Alignment with New Parameters [email protected]@SLAC.Stanford.edu

Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center

Now correct trajectory with ‘careful’ steeringNow correct trajectory with ‘careful’ steering

++ Quadrupole Quadrupole positionspositions

oo BPM readback BPM readback

ee trajectory trajectory

173°173° 173°173°

Much beyond this Much beyond this level will require level will require repeat iteration of repeat iteration of BBABBA

xx 3.5 3.5 mmxx 3.5 3.5 mm

yy 4.8 4.8 mmyy 4.8 4.8 mm

(old parameters)(old parameters)

Page 23: Beam-Based Alignment with New Parameters Emma@SLAC.Stanford.edu Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator.

LCLS Undulator Workshop, Oct. 24, 2003LCLS Undulator Workshop, Oct. 24, 2003 Paul Emma, SLACPaul Emma, SLACBeam-Based Alignment with New Parameters [email protected]@SLAC.Stanford.edu

Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center

After 3rd pass, new parameters, 2-m mover backlashAfter 3rd pass, new parameters, 2-m mover backlash

83°83° 83°83°

xx 1.8 1.8 mmxx 1.8 1.8 mm

yy 4.7 4.7 mmyy 4.7 4.7 mm

2-2-mm random random mover backlash mover backlash (uniform dist. (uniform dist. with FWHM = with FWHM = 4 4 m)m)

Page 24: Beam-Based Alignment with New Parameters Emma@SLAC.Stanford.edu Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator.

LCLS Undulator Workshop, Oct. 24, 2003LCLS Undulator Workshop, Oct. 24, 2003 Paul Emma, SLACPaul Emma, SLACBeam-Based Alignment with New Parameters [email protected]@SLAC.Stanford.edu

Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center

After 3rd pass, new parameters, 4-m mover backlashAfter 3rd pass, new parameters, 4-m mover backlash

124°124° 124°124°

xx 2.5 2.5 mmxx 2.5 2.5 mm

yy 8.0 8.0 mmyy 8.0 8.0 mm

4-4-mm random random mover backlash mover backlash (uniform dist. (uniform dist. with FWHM = with FWHM = 8 8 m)m)

Page 25: Beam-Based Alignment with New Parameters Emma@SLAC.Stanford.edu Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator.

LCLS Undulator Workshop, Oct. 24, 2003LCLS Undulator Workshop, Oct. 24, 2003 Paul Emma, SLACPaul Emma, SLACBeam-Based Alignment with New Parameters [email protected]@SLAC.Stanford.edu

Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center

After 3rd pass BBA, new parameters, 100-m initial alignmentAfter 3rd pass BBA, new parameters, 100-m initial alignment

100-100-mm initial initial BPM & quad BPM & quad offsets offsets (uncorrelated)(uncorrelated)

88°88° 88°88°xx 3.6 3.6 mmxx 3.6 3.6 mm

yy 2.8 2.8 mmyy 2.8 2.8 mm