Heinz-Dieter Nuhn, SLAC / LCLS LTU/Undulator Commissioning Plans [email protected] June 16, 2008 1 LTU/Undulator Commissioning Plans Heinz-Dieter

June 16, 2008 1 Heinz-Dieter Nuhn, SLAC / LCLSLTU/Undulator Commissioning Plans [email protected]

LTU/Undulator Commissioning PlansHeinz-Dieter Nuhn, SLAC / LCLS

June 16, 2008

LTU/Undulator Commissioning PlansHeinz-Dieter Nuhn, SLAC / LCLS

June 16, 2008

OverviewPre-Beam CheckoutsLTU to Dump Commissioning (No Undulator Segments)Undulator Segments CommissioningCharacterization of Spontaneous Synchrotron RadiationCharacterization of SASE

OverviewPre-Beam CheckoutsLTU to Dump Commissioning (No Undulator Segments)Undulator Segments CommissioningCharacterization of Spontaneous Synchrotron RadiationCharacterization of SASE


Related Presentations

Paul Emma, Commissioning Results and Plans

H. Tompkins, FEE/FEL Commissioning Overview

Richard Bionta, FEE Diagnostics and Commissioning


LCLSLCLS Installation and Commissioning Time-Line Installation and Commissioning Time-Line

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Re-Re-commission commission

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NEH NEH Operations/ Operations/ CommissioningCommissioning

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Beam-Based CommissioningBeam-Based Commissioning

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DD

A: LTU – Dump

B: Undulator Segments

C: Spontaneous X-Rays

D: SASE

A: LTU – Dump

B: Undulator Segments

C: Spontaneous X-Rays

D: SASE

e--Beam

X-Ray

20092008


Installation and Conventional Alignment (=>Nov 08)All beamline components except Undulator Segments

Pre-Beam Checkouts (Checklists will be prepared) (Oct-Dec 08)LTU Section

Magnet Polarities / Motion (OTR, Collimators, Wire-scanners) / etc.

Undulator SectionMagnet Polarities / Motion (Girder, BFW, Slide) / ADS Calibration / etc.

Pre-Undulator Commissioning with Beam (Jan 09 – Mar 09)LTU SectionUndulator Section (w/o Undulator Segments)

Motion Control / Beam Containment / Beam-Based Alignment / etc.

Beam Dump Section

Installation of Undulator Segments (Mar 09)Undulator Commissioning with Beam (Mar 09 – Apr 09)

Beam Based Alignment / Undulator Slide Functions / Beam Stability

Installation and Conventional Alignment (=>Nov 08)All beamline components except Undulator Segments

Pre-Beam Checkouts (Checklists will be prepared) (Oct-Dec 08)LTU Section

Magnet Polarities / Motion (OTR, Collimators, Wire-scanners) / etc.

Undulator SectionMagnet Polarities / Motion (Girder, BFW, Slide) / ADS Calibration / etc.

Pre-Undulator Commissioning with Beam (Jan 09 – Mar 09)LTU SectionUndulator Section (w/o Undulator Segments)

Motion Control / Beam Containment / Beam-Based Alignment / etc.

Beam Dump Section

Installation of Undulator Segments (Mar 09)Undulator Commissioning with Beam (Mar 09 – Apr 09)

Beam Based Alignment / Undulator Slide Functions / Beam Stability

LTU/Undulator e--Beam Commissioning Blocks

AA

BB


LTU-to-Dump Pre-Beam Checkouts (Oct-Dec 08)

Undulator Hall HVAC System checkout (before Girder installation)ADS (WPM & HLS) Control System checkoutADS commissioningEPICS Control System Checkout

Network Configuration of IOC'sTiming SystemCommunication with ADS Checkout

Verification of individual Device OperationMagnet Power Supplies and Interlocks Magnet Polarity Checkout

DipolesQuadrupolesCorrectors (where power supplies available)

BPM Cable CheckoutMotion Checkouts

Movable Collimator motion Wire Scanner motion & calibrationBeam Finder Wire In/Out motion (BFW01 – BFW33)Girder Motion Control checkout (33 Girders using external pos. sensors)

CAM Mover motion checkoutTransverse slide motion checkoutCompound motion checkout (Smooth beamline motion, System re-pointing)

Undulator Hall HVAC System checkout (before Girder installation)ADS (WPM & HLS) Control System checkoutADS commissioningEPICS Control System Checkout

Network Configuration of IOC'sTiming SystemCommunication with ADS Checkout

Verification of individual Device OperationMagnet Power Supplies and Interlocks Magnet Polarity Checkout

DipolesQuadrupolesCorrectors (where power supplies available)

BPM Cable CheckoutMotion Checkouts

Movable Collimator motion Wire Scanner motion & calibrationBeam Finder Wire In/Out motion (BFW01 – BFW33)Girder Motion Control checkout (33 Girders using external pos. sensors)

CAM Mover motion checkoutTransverse slide motion checkoutCompound motion checkout (Smooth beamline motion, System re-pointing)


LTU Commissioning with Beam (Jan-Mar 09)

Perform radiation surveys in BTH/FEE, etc with beam in the dump (Stan Mao, et al.)Checkout BPMs (timing, scale, sign errors, etc.)Test MPS (toroid collimators, BPMs, loss monitors, magnets, trip the beam, etc?)Checkout optics using beam oscillation data (does a betatron oscillation fit the model well everywhere? – backwards quads?)Test/checkout BYKIK and its abort dump and logic (MPS).Test/checkout new OTR screens/cameras (OTR30, OTR33, and OTRDMP).Test/checkout new wire scanners (WS31, 32, 33, 34).Test/checkout new adjustable collimators (CEDL1, CEDL3, CX31, CY32, CX35, CY36)Commission new energy and launch feedback loops.Characterize beam, etc.

Perform radiation surveys in BTH/FEE, etc with beam in the dump (Stan Mao, et al.)Checkout BPMs (timing, scale, sign errors, etc.)Test MPS (toroid collimators, BPMs, loss monitors, magnets, trip the beam, etc?)Checkout optics using beam oscillation data (does a betatron oscillation fit the model well everywhere? – backwards quads?)Test/checkout BYKIK and its abort dump and logic (MPS).Test/checkout new OTR screens/cameras (OTR30, OTR33, and OTRDMP).Test/checkout new wire scanners (WS31, 32, 33, 34).Test/checkout new adjustable collimators (CEDL1, CEDL3, CX31, CY32, CX35, CY36)Commission new energy and launch feedback loops.Characterize beam, etc.

AA


Undulator Beamline Commissioning to Main Dump with Beam but without Undulator Segments (Jan-Mar 08)

Commission Radiation MonitorsGet Beam through Undulator vacuum pipe with minimum losses.Checkout BPMs (timing, scale, sign errors, etc.)Commission Girder Motion with Beam

Verify and calibrate steering effect of quadrupole motionCalibrate motion parameters (gain, pivot points etc.)Check BPM offset tracking

Commission RF Cavity BPMsCheck charge dependent response over entire charge rangeUse Girder Motion to calibrate position vs. readings

Check and correct optics matching over entire operational energy rangeCommission Beam Based Alignment (BBA)

Develop saved configurations for three different energies.Commission BBA GUIs and BBA procedure.

Commission Beam Finder WiresCalibrate PMT signals.Commission BFW GUIs (Alignment and scanning capabilities)

Commission ADS-based girder position stabilization feedback systems.Commission Tune-Up Dump in preparation for commissioning with Undulator Segments

Commission Radiation MonitorsGet Beam through Undulator vacuum pipe with minimum losses.Checkout BPMs (timing, scale, sign errors, etc.)Commission Girder Motion with Beam

Verify and calibrate steering effect of quadrupole motionCalibrate motion parameters (gain, pivot points etc.)Check BPM offset tracking

Commission RF Cavity BPMsCheck charge dependent response over entire charge rangeUse Girder Motion to calibrate position vs. readings

Check and correct optics matching over entire operational energy rangeCommission Beam Based Alignment (BBA)

Develop saved configurations for three different energies.Commission BBA GUIs and BBA procedure.

Commission Beam Finder WiresCalibrate PMT signals.Commission BFW GUIs (Alignment and scanning capabilities)

Commission ADS-based girder position stabilization feedback systems.Commission Tune-Up Dump in preparation for commissioning with Undulator Segments

AA


Install Undulator Segments (Mar 09)

Mount Undulator Segments onto girdersSegments will be stored in Undulator Hall before installation

System is designed to be Self-Aligning

Re-check slide motion clearance

Expect to install 3 Segments / day

Mount Undulator Segments onto girdersSegments will be stored in Undulator Hall before installation

System is designed to be Self-Aligning

Re-check slide motion clearance

Expect to install 3 Segments / day


First Beam Through Undulator Segments (Mar 09)

Conditions for First Beam:All Undulator Magnets Rolled-Out

Single Shot Operation (low charge)Send single electron bunch through undulator

Read and evaluate as much diagnostics as possible along undulator(such as BPMs, beam loss monitors, toroids)

Identify and remove sources of beam loss – if any

Iterate

Goal: Get beam through vacuum chamber with minimum losses.

Reminder: Main Constraint is to Protect Undulator from Radiation Damage

Conditions for First Beam:All Undulator Magnets Rolled-Out

Single Shot Operation (low charge)Send single electron bunch through undulator

Read and evaluate as much diagnostics as possible along undulator(such as BPMs, beam loss monitors, toroids)

Identify and remove sources of beam loss – if any

Iterate

Goal: Get beam through vacuum chamber with minimum losses.

Reminder: Main Constraint is to Protect Undulator from Radiation Damage

BB


First Undulator Segments Commissioning (Mar – Apr 09)

Undulator Segments still in Roll-Out positionRun BBA

Roll-In Individual Undulator SegmentsTransport beam through individual Undulator SegmentsStart at slot #33 (last Undulator Segment)

Check and correct trajectory change.

Run BBA with Undulator Segments inserted.

Check Segment alignment with BFWs

Undulator Segments still in Roll-Out positionRun BBA

Roll-In Individual Undulator SegmentsTransport beam through individual Undulator SegmentsStart at slot #33 (last Undulator Segment)

Check and correct trajectory change.

Run BBA with Undulator Segments inserted.

Check Segment alignment with BFWs

BB


Commissioning of X-Ray Diagnostics (May – Jun 09)

Direct Imager

Slit

Solid Attenuator

Gas Attenuator

Gas Detector

Beam-Based K Measurement Components

Direct Imager

Slit

Solid Attenuator

Gas Attenuator

Gas Detector

Beam-Based K Measurement Components

Minimum RequirementMinimum Requirement

See presentations by Tompkins and BiontaSee presentations by Tompkins and Bionta

X-Ray Diagnostics is located after last Undulator Segment in Front-End Enclosure (FEE)

X-Ray Diagnostics is located after last Undulator Segment in Front-End Enclosure (FEE)


X Ray Diagnostics (FEE)

SolidAttenuator

Gas Attenuator

Slit

Start of Experimental

Hutches

5 mm diameter

collimators

Muon Shield

Hard X-Ray Offset mirror

system

TotalEnergyThermal Detector

WFOV

NFOV

Gas Detector

Gas Detector

e-

Direct Imager

Hard x-ray Monochromator (K Spectrometer)

Soft X-Ray Offset mirror

system

See presentations by Tompkins and BiontaSee presentations by Tompkins and Bionta


Characterization of Spontaneous Radiation (May – Jun 09)

Initially at 1.5 Å to reduce damage issueStart at low chargeRepetition rate of 10 Hz or lower will be sufficientStart to characterize radiation at last undulator

Measure:total spontaneous energy / pulsespontaneous beam directiontemporal variation in spontaneous beam parametersspatial distribution around first spontaneous harmonicspontaneous radiation spectrumwavelength of first harmonicfirst harmonic wavelength spread

Characterize radiation from each individual UndulatorMeasure relative K of Undulator pair.

Initially at 1.5 Å to reduce damage issueStart at low chargeRepetition rate of 10 Hz or lower will be sufficientStart to characterize radiation at last undulator

Measure:total spontaneous energy / pulsespontaneous beam directiontemporal variation in spontaneous beam parametersspatial distribution around first spontaneous harmonicspontaneous radiation spectrumwavelength of first harmonicfirst harmonic wavelength spread

Characterize radiation from each individual UndulatorMeasure relative K of Undulator pair.

Limited capability Limited capability using K using K SpectrometerSpectrometer

CC


K Measurement: 2-Segment Scheme

Measure synchrotron radiation spectrum produced by two undulator segments, and scan K of one segmentK’s are matched when spectrum has the steepest slope on high energy side of 1st harmonic peak. Match segments pair-wise until all segments are measured.

undulator segments (33 total)segments under test

CC


Angle-Integrated Spontaneous Spectrum for 2 Undulators with Angle-Integrated Spontaneous Spectrum for 2 Undulators with KK//KK = = 0.2 to +0.2%0.2 to +0.2%

0.1% rms 0.1% rms ee energy jitter energy jitter0.003% rms 0.003% rms ee energy energy meas. resolutionmeas. resolution2% rms charge jitter2% rms charge jitter0.5% charge meas. res.0.5% charge meas. res.0.50.5 rms angle jitter rms angle jitter101055 photons/pulse/0.01% photons/pulse/0.01%100 photon noise100 photon noise100 beam pulses with 100 beam pulses with natural energy jitter onlynatural energy jitter only

0.1% rms 0.1% rms ee energy jitter energy jitter0.003% rms 0.003% rms ee energy energy meas. resolutionmeas. resolution2% rms charge jitter2% rms charge jitter0.5% charge meas. res.0.5% charge meas. res.0.50.5 rms angle jitter rms angle jitter101055 photons/pulse/0.01% photons/pulse/0.01%100 photon noise100 photon noise100 beam pulses with 100 beam pulses with natural energy jitter onlynatural energy jitter only

= 0= 0

KK//KK = = 0.2% 0.2%

KK//KK = = 0.2% 0.2%

KK//KK = 0% = 0%

~10

~1066 p

hoto

ns/n

C/0

.01%

BW

pho

tons

/nC

/0.0

1%B

W

xx = = 3 3 mmmm

xx = = 3 3 mmmm

Simulations P. Emma

CC


Characterization of SASE (Jul – Aug 09)

Initially at 15 Å to maximize SASE gainStart with reduced number of undulatorsRedo BBA after change of undulator configuration

Verify that electron beam meets requirements

Find SASE signal using Direct Imager

Use Laser-Heater modulation to control gain(7 Hz Lock-In Detection) if necessary

Repetition rate of 30 Hz (to support Lock-In Detection)

Optimize gain (through electron beam quality and BBA)

Measure gain length etc…

Initially at 15 Å to maximize SASE gainStart with reduced number of undulatorsRedo BBA after change of undulator configuration

Verify that electron beam meets requirements

Find SASE signal using Direct Imager

Use Laser-Heater modulation to control gain(7 Hz Lock-In Detection) if necessary

Repetition rate of 30 Hz (to support Lock-In Detection)

Optimize gain (through electron beam quality and BBA)

Measure gain length etc…

DD


Measurements along undulator

Intensity (LG, Saturation)

Measurements after undulator

Photon wavelength

Photon wavelength spread

Pulse intensity

Pulse duration

Pulse centroid and direction

Spatial distribution

Jitter

Measurements along undulator

Intensity (LG, Saturation)

Measurements after undulator

Photon wavelength

Photon wavelength spread

Pulse intensity

Pulse duration

Pulse centroid and direction

Spatial distribution

Jitter

FEL Measurements

Undulator RegimeUndulator Regime

Exponential Gain Regime

Exponential Gain Regime

Saturation

Saturation

1 % of X-Ray Pulse1 % of X-Ray Pulse

Electron BunchMicro-Bunching

Electron BunchMicro-Bunching

DD


SASE Characterization with FEE Diagnostics

X-ray beam diagnostics located in FEE, down stream of last Undulator Segment

Obtain necessary z-dependent information through SASE gain shut-off at selectable points along undulator line by

Introduction of trajectory distortion or

Roll-out of individual undulator segments

X-ray beam diagnostics located in FEE, down stream of last Undulator Segment

Obtain necessary z-dependent information through SASE gain shut-off at selectable points along undulator line by

Introduction of trajectory distortion or

Roll-out of individual undulator segments

DD


Measurement of SASE Gain Length Using Rollout

Undulator Segments can be rolled-out by remote control. Roll-out will start at the last Segment. Rolled-out Segments will not effect radiation produced by earlier segments.

DD


Plans for LTU/Undulator commissioning have been worked out and include

Detailed pre-beam checkoutLTU-Main Dump commissioning without Undulator Segments installed.Installation of Undulator Segments.Undulator Segment Commissioning

Characterization of Spontaneous Radiation will be combined with commissioning of X-Ray diagnostics suite in FEE

Beam based K-measurement method included.

Characterization of SASE will start at 15 ÅGain length measurements will use FEE x-ray diagnostics combined with z-dependent SASE gain cut-off

Plans for LTU/Undulator commissioning have been worked out and include

Detailed pre-beam checkoutLTU-Main Dump commissioning without Undulator Segments installed.Installation of Undulator Segments.Undulator Segment Commissioning

Characterization of Spontaneous Radiation will be combined with commissioning of X-Ray diagnostics suite in FEE

Beam based K-measurement method included.

Characterization of SASE will start at 15 ÅGain length measurements will use FEE x-ray diagnostics combined with z-dependent SASE gain cut-off

Summary

DD

CC

BB

AA


End of Presentation


Application Software Development

LTU Emittance Measurement (Loos – extension of existing GUI)

Undulator Steering and re-Pointing (Nuhn)

Beta-Matching into the Undulator – with variable mean beta (Loos)

Beam-Based Alignment of the FEL Undulator (Loos)

Beam-Finder Wire Application – Centering & Emittance (Loos/Nuhn)

K-Measurement Application (Welch/Nuhn)

There will probably be more …

LTU Emittance Measurement (Loos – extension of existing GUI)

Undulator Steering and re-Pointing (Nuhn)

Beta-Matching into the Undulator – with variable mean beta (Loos)

Beam-Based Alignment of the FEL Undulator (Loos)

Beam-Finder Wire Application – Centering & Emittance (Loos/Nuhn)

K-Measurement Application (Welch/Nuhn)

There will probably be more …


Undulator Segment and TLD Replacement Program

20102009


Measurement of SASE Gain Length withTrajectory Distortion

GENESIS Simulations by Z. Huang

Quadrupole Displacement at Selectable Point along Undulator

Quadrupole Displacement at Selectable Point along Undulator

DD

Documents

Heinz-Dieter Nuhn, SLAC / LCLS LTU/Undulator Commissioning Plans [email protected] June 16, 2008 1 LTU/Undulator Commissioning Plans Heinz-Dieter