Heinz-Dieter Nuhn, SLAC / LCLS LTU/Undulator Commissioning Plans nuhn@slac.stanford.edu June 16, 2008 1 LTU/Undulator Commissioning Plans Heinz-Dieter.

  • Published on
    20-Dec-2015

  • View
    215

  • Download
    0

Embed Size (px)

Transcript

  • Slide 1
  • Heinz-Dieter Nuhn, SLAC / LCLS LTU/Undulator Commissioning Plans nuhn@slac.stanford.edu June 16, 2008 1 LTU/Undulator Commissioning Plans Heinz-Dieter Nuhn, SLAC / LCLS June 16, 2008 Overview Pre-Beam Checkouts LTU to Dump Commissioning (No Undulator Segments) Undulator Segments Commissioning Characterization of Spontaneous Synchrotron Radiation Characterization of SASE Overview Pre-Beam Checkouts LTU to Dump Commissioning (No Undulator Segments) Undulator Segments Commissioning Characterization of Spontaneous Synchrotron Radiation Characterization of SASE
  • Slide 2
  • Heinz-Dieter Nuhn, SLAC / LCLS LTU/Undulator Commissioning Plans nuhn@slac.stanford.edu June 16, 2008 2 Related Presentations Paul Emma, Commissioning Results and Plans H. Tompkins, FEE/FEL Commissioning Overview Richard Bionta, FEE Diagnostics and Commissioning
  • Slide 3
  • Heinz-Dieter Nuhn, SLAC / LCLS LTU/Undulator Commissioning Plans nuhn@slac.stanford.edu June 16, 2008 3 LCLS Installation and Commissioning Time-Line LTU/Und/Dump Install LTU/UndComm. Re-commission Inj/BC2 to SL2 First Light in FEE PEP-II run ends FEE/NEH Install PPS Cert. LTU/Dump FEH Install CD-4 (7/31/2010) X-Rays in NEH First Light in FEH NEH Operations/ Commissioning JFMAMJJASDJFMAMJJASONDJFMAMJJON A 2008 2009 2010 2008 2009 2010 Down PPS AM now Linac/BC2 Commissioning FEEComm. May 2, 2008 FEH Hutch BO Undulator Seg. Install
  • Slide 4
  • Heinz-Dieter Nuhn, SLAC / LCLS LTU/Undulator Commissioning Plans nuhn@slac.stanford.edu June 16, 2008 4 Beam-Based Commissioning A A B B C C D D 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
  • Slide 5
  • Heinz-Dieter Nuhn, SLAC / LCLS LTU/Undulator Commissioning Plans nuhn@slac.stanford.edu June 16, 2008 5 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 Section Undulator 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 Section Magnet Polarities / Motion (Girder, BFW, Slide) / ADS Calibration / etc. Pre-Undulator Commissioning with Beam (Jan 09 Mar 09) LTU Section Undulator 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 A B B
  • Slide 6
  • Heinz-Dieter Nuhn, SLAC / LCLS LTU/Undulator Commissioning Plans nuhn@slac.stanford.edu June 16, 2008 6 LTU-to-Dump Pre-Beam Checkouts (Oct-Dec 08) Undulator Hall HVAC System checkout (before Girder installation) ADS (WPM & HLS) Control System checkout ADS commissioning EPICS Control System Checkout Network Configuration of IOC's Timing System Communication with ADS Checkout Verification of individual Device Operation Magnet Power Supplies and Interlocks Magnet Polarity Checkout Dipoles Quadrupoles Correctors (where power supplies available) BPM Cable Checkout Motion Checkouts Movable Collimator motion Wire Scanner motion & calibration Beam Finder Wire In/Out motion (BFW01 BFW33) Girder Motion Control checkout (33 Girders using external pos. sensors) CAM Mover motion checkout Transverse slide motion checkout Compound motion checkout (Smooth beamline motion, System re-pointing) Undulator Hall HVAC System checkout (before Girder installation) ADS (WPM & HLS) Control System checkout ADS commissioning EPICS Control System Checkout Network Configuration of IOC's Timing System Communication with ADS Checkout Verification of individual Device Operation Magnet Power Supplies and Interlocks Magnet Polarity Checkout Dipoles Quadrupoles Correctors (where power supplies available) BPM Cable Checkout Motion Checkouts Movable Collimator motion Wire Scanner motion & calibration Beam Finder Wire In/Out motion (BFW01 BFW33) Girder Motion Control checkout (33 Girders using external pos. sensors) CAM Mover motion checkout Transverse slide motion checkout Compound motion checkout (Smooth beamline motion, System re-pointing)
  • Slide 7
  • Heinz-Dieter Nuhn, SLAC / LCLS LTU/Undulator Commissioning Plans nuhn@slac.stanford.edu June 16, 2008 7 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. A A
  • Slide 8
  • Heinz-Dieter Nuhn, SLAC / LCLS LTU/Undulator Commissioning Plans nuhn@slac.stanford.edu June 16, 2008 8 Undulator Beamline Commissioning to Main Dump with Beam but without Undulator Segments (Jan-Mar 08) Commission Radiation Monitors Get 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 motion Calibrate motion parameters (gain, pivot points etc.) Check BPM offset tracking Commission RF Cavity BPMs Check charge dependent response over entire charge range Use Girder Motion to calibrate position vs. readings Check and correct optics matching over entire operational energy range Commission Beam Based Alignment (BBA) Develop saved configurations for three different energies. Commission BBA GUIs and BBA procedure. Commission Beam Finder Wires Calibrate 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 Monitors Get 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 motion Calibrate motion parameters (gain, pivot points etc.) Check BPM offset tracking Commission RF Cavity BPMs Check charge dependent response over entire charge range Use Girder Motion to calibrate position vs. readings Check and correct optics matching over entire operational energy range Commission Beam Based Alignment (BBA) Develop saved configurations for three different energies. Commission BBA GUIs and BBA procedure. Commission Beam Finder Wires Calibrate 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 A
  • Slide 9
  • Heinz-Dieter Nuhn, SLAC / LCLS LTU/Undulator Commissioning Plans nuhn@slac.stanford.edu June 16, 2008 9 Install Undulator Segments (Mar 09) Mount Undulator Segments onto girders Segments 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 girders Segments 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
  • Slide 10
  • Heinz-Dieter Nuhn, SLAC / LCLS LTU/Undulator Commissioning Plans nuhn@slac.stanford.edu June 16, 2008 10 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 B B
  • Slide 11
  • Heinz-Dieter Nuhn, SLAC / LCLS LTU/Undulator Commissioning Plans nuhn@slac.stanford.edu June 16, 2008 11 First Undulator Segments Commissioning (Mar Apr 09) Undulator Segments still in Roll-Out position Run BBA Roll-In Individual Undulator Segments Transport beam through individual Undulator Segments Start 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 position Run BBA Roll-In Individual Undulator Segments Transport beam through individual Undulator Segments Start at slot #33 (last Undulator Segment) Check and correct trajectory change. Run BBA with Undulator Segments inserted. Check Segment alignment with BFWs B B
  • Slide 12
  • Heinz-Dieter Nuhn, SLAC / LCLS LTU/Undulator Commissioning Plans nuhn@slac.stanford.edu June 16, 2008 12 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 Requirement See presentations by Tompkins and Bionta X-Ray Diagnostics is located after last Undulator Segment in Front-End Enclosure (FEE)
  • Slide 13
  • Heinz-Dieter Nuhn, SLAC / LCLS LTU/Undulator Commissioning Plans nuhn@slac.stanford.edu June 16, 2008 13 X Ray Diagnostics (FEE) Solid Attenuator Gas Attenuator Slit Start of Experimental Hutches 5 mm diameter collimators Muon Shield Hard X-Ray Offset mirror system Total Energy Thermal Detector WFOV NFOV Gas Detector e-e- Direct Imager Hard x-ray Monochromator (K Spectrometer) Soft X-Ray Offset mirror system See presentations by Tompkins and Bionta
  • Slide 14
  • Heinz-Dieter Nuhn, SLAC / LCLS LTU/Undulator Commissioning Plans nuhn@slac.stanford.edu June 16, 2008 14 Characterization of Spontaneous Radiation (May Jun 09) Initially at 1.5 to reduce damage issue Start at low charge Repetition rate of 10 Hz or lower will be sufficient Start to characterize radiation at last undulator Measure: total spontaneous energy / pulse spontaneous beam direction temporal variation in spontaneous beam parameters spatial distribution around first spontaneous harmonic spontaneous radiation spectrum wavelength of first harmonic first harmonic wavelength spread Characterize radiation from each individual Undulator Measure relative K of Undulator pair. Initially at 1.5 to reduce damage issue Start at low charge Repetition rate of 10 Hz or lower will be sufficient Start to characterize radiation at last undulator Measure: total spontaneous energy / pulse spontaneous beam direction temporal variation in spontaneous beam parameters spatial distribution around first spontaneous harmonic spontaneous radiation spectrum wavelength of first harmonic first harmonic wavelength spread Characterize radiation from each individual Undulator Measure relative K of Undulator pair. Limited capability using K Spectrometer C C
  • Slide 15
  • Heinz-Dieter Nuhn, SLAC / LCLS LTU/Undulator Commissioning Plans nuhn@slac.stanford.edu June 16, 2008 15 K Measurement: 2-Segment Scheme Measure synchrotron radiation spectrum produced by two undulator segments, and scan K of one segment Ks 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 C
  • Slide 16
  • Heinz-Dieter Nuhn, SLAC / LCLS LTU/Undulator Commissioning Plans nuhn@slac.stanford.edu June 16, 2008 16 Angle-Integrated Spontaneous Spectrum for 2 Undulators with K/K = 0.2 to +0.2% 0.1% rms e energy jitter 0.003% rms e energy meas. resolution 2% rms charge jitter 0.5% charge meas. res. 0.5 rms angle jitter 10 5 photons/pulse/0.01% 100 photon noise 100 beam pulses with natural energy jitter only 0.1% rms e energy jitter 0.003% rms e energy meas. resolution 2% rms charge jitter 0.5% charge meas. res. 0.5 rms angle jitter 10 5 photons/pulse/0.01% 100 photon noise 100 beam pulses with natural energy jitter only = 0 K/K = 0.2% K/K = 0.2% K/K = 0% ~10 6 photons/nC/0.01%BW x = 3 mm Simulations P. Emma C C
  • Slide 17
  • Heinz-Dieter Nuhn, SLAC / LCLS LTU/Undulator Commissioning Plans nuhn@slac.stanford.edu June 16, 2008 17 Characterization of SASE (Jul Aug 09) Initially at 15 to maximize SASE gain Start with reduced number of undulators Redo 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 Re...

Recommended

View more >