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
OverviewPre-Beam CheckoutsLTU to Dump Commissioning (No Undulator Segments)Undulator Segments CommissioningCharacterization of Spontaneous Synchrotron RadiationCharacterization of SASE
June 16, 2008 2 Heinz-Dieter Nuhn, SLAC / LCLSLTU/Undulator Commissioning Plans [email protected]
Related Presentations
Paul Emma, Commissioning Results and PlansH. Tompkins, FEE/FEL Commissioning OverviewRichard Bionta, FEE Diagnostics and Commissioning
June 16, 2008 3 Heinz-Dieter Nuhn, SLAC / LCLSLTU/Undulator Commissioning Plans [email protected]
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
JJ FF MM AA MM JJ JJ AA SS DD JJ FF MM AA MM JJ JJ AA SS OONN DD JJ FF MM AA MM JJ JJOONNA 2008 2009 20102008 2009 2010DownDown
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June 16, 2008 4 Heinz-Dieter Nuhn, SLAC / LCLSLTU/Undulator Commissioning Plans [email protected]
Beam-Based Commissioning
A
B
C
D
A: LTU – DumpB: Undulator SegmentsC: Spontaneous X-RaysD: SASE
e--Beam
X-Ray
20092008
June 16, 2008 5 Heinz-Dieter Nuhn, SLAC / LCLSLTU/Undulator Commissioning Plans [email protected]
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 Section
Magnet 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
A
B
June 16, 2008 6 Heinz-Dieter Nuhn, SLAC / LCLSLTU/Undulator Commissioning Plans [email protected]
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)
June 16, 2008 7 Heinz-Dieter Nuhn, SLAC / LCLSLTU/Undulator Commissioning Plans [email protected]
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.
A
June 16, 2008 8 Heinz-Dieter Nuhn, SLAC / LCLSLTU/Undulator Commissioning Plans [email protected]
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
A
June 16, 2008 9 Heinz-Dieter Nuhn, SLAC / LCLSLTU/Undulator Commissioning Plans [email protected]
Install Undulator Segments (Mar 09)
Mount Undulator Segments onto girdersSegments will be stored in Undulator Hall before installation
System is designed to be Self-AligningRe-check slide motion clearanceExpect to install 3 Segments / day
June 16, 2008 10 Heinz-Dieter Nuhn, SLAC / LCLSLTU/Undulator Commissioning Plans [email protected]
First Beam Through Undulator Segments (Mar 09)
Conditions for First Beam:All Undulator Magnets Rolled-OutSingle Shot Operation (low charge)
Send single electron bunch through undulatorRead 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
B
June 16, 2008 11 Heinz-Dieter Nuhn, SLAC / LCLSLTU/Undulator Commissioning Plans [email protected]
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
B
June 16, 2008 12 Heinz-Dieter Nuhn, SLAC / LCLSLTU/Undulator Commissioning Plans [email protected]
Commissioning of X-Ray Diagnostics (May – Jun 09)
Direct ImagerSlitSolid AttenuatorGas AttenuatorGas DetectorBeam-Based K Measurement Components
Minimum Requirement
See presentations by Tompkins and Bionta
X-Ray Diagnostics is located after last Undulator Segment in Front-End Enclosure (FEE)
June 16, 2008 13 Heinz-Dieter Nuhn, SLAC / LCLSLTU/Undulator Commissioning Plans [email protected]
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 Bionta
June 16, 2008 14 Heinz-Dieter Nuhn, SLAC / LCLSLTU/Undulator Commissioning Plans [email protected]
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.
Limited capability Limited capability using K using K SpectrometerSpectrometer
C
June 16, 2008 15 Heinz-Dieter Nuhn, SLAC / LCLSLTU/Undulator Commissioning Plans [email protected]
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
C
June 16, 2008 16 Heinz-Dieter Nuhn, SLAC / LCLSLTU/Undulator Commissioning Plans [email protected]
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= 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
Simulations P. Emma
C
June 16, 2008 17 Heinz-Dieter Nuhn, SLAC / LCLSLTU/Undulator Commissioning Plans [email protected]
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 requirementsFind SASE signal using Direct ImagerUse Laser-Heater modulation to control gain(7 Hz Lock-In Detection) if necessaryRepetition rate of 30 Hz (to support Lock-In Detection)Optimize gain (through electron beam quality and BBA)Measure gain length etc…
D
June 16, 2008 18 Heinz-Dieter Nuhn, SLAC / LCLSLTU/Undulator Commissioning Plans [email protected]
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 Regime
Exponential Gain Regime
Saturation
1 % of X-Ray Pulse
Electron BunchMicro-Bunching
D
June 16, 2008 19 Heinz-Dieter Nuhn, SLAC / LCLSLTU/Undulator Commissioning Plans [email protected]
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
D
June 16, 2008 20 Heinz-Dieter Nuhn, SLAC / LCLSLTU/Undulator Commissioning Plans [email protected]
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.
D
June 16, 2008 21 Heinz-Dieter Nuhn, SLAC / LCLSLTU/Undulator Commissioning Plans [email protected]
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 Å
Gain length measurements will use FEE x-ray diagnostics combined with z-dependent SASE gain cut-off
Summary
D
C
B
A
June 16, 2008 22 Heinz-Dieter Nuhn, SLAC / LCLSLTU/Undulator Commissioning Plans [email protected]
End of Presentation
June 16, 2008 23 Heinz-Dieter Nuhn, SLAC / LCLSLTU/Undulator Commissioning Plans [email protected]
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 …
June 16, 2008 24 Heinz-Dieter Nuhn, SLAC / LCLSLTU/Undulator Commissioning Plans [email protected]
Undulator Segment and TLD Replacement Program20102009
June 16, 2008 25 Heinz-Dieter Nuhn, SLAC / LCLSLTU/Undulator Commissioning Plans [email protected]
Measurement of SASE Gain Length withTrajectory Distortion
GENESIS Simulations by Z. Huang
Quadrupole Displacement at Selectable Point along Undulator
D