• Beam through entire system
  • Align HFP chamber to beam
  • Collect images of beam on diff pumping YAG
  • Collect images of beam on beam viewing paddle
  • Align Diagnostics chamber to beam
  • Collect images of beam on upstream diff pumping YAG
  • Collect images of beam on downstream HiRes beam screen
  • Align laser to beam - rough
  • FEL beam OFF
  • Insert mirror
  • Align beam, collecting images as necessary
  • Remove mirror before beam back ON
  • Pulse energy monitor
  • Offline testing of pressure, magnet current, detector voltages, data acq
  • Setup with appropriate pressure – observe signal
  • Correlate signal with FEE pulse energy monitors
  • Attenuate beam with gas attenuator & verify operation
  • Vary pressure and tabulate response
  • Shutter operation
  • View beam at Diagnostics chamber downsream HiRes beam screen
  • Beam OFF, shutter open
  • Insert shutter to nominal position
  • Beam ON, find beam on YAGs & center beam in shutter
  • Close shutter – observe beam screen
  • Pulse shutter – use pulse energy monitor to pick 1 Hz ?
  • Slit operation
  • View beam at Diagnostics chamber downstream HiRes beam screen
  • Monitor pulse energy with pulse energy monitor
  • Scan one slit blade at a time to find center of beam
  • Mask beam to varying degrees, watch for intensity variations between FEE and AMO monitors
  • Open slits back open
  • KB optics
  • Focus optics for HFP interaction point
  • Insert KB optics into beam (nominal position)
  • Align chambers to KB optics
  • Heavily attenuated beam – check alignment & adjust
  • Imprint beam into beam focus verification paddle & view with microscope
  • Vary focal length between HFP and diagnostics chamber – dble check alignment
  • Repeat beam imprinting after focal length variation
  • Dynamic beam focus studies using Jacek’s set-up
  • HFP iTOF
  • Apply voltages to iTOF lenses
  • Apply voltages to iTOF detector (dark counts, off-line)
  • Acquire spectra using residual gas, either from background pressure or gas jet leakage – optimize voltages
  • Vary acceleration, extraction voltages to define operational space
  • Gas jet optimization & operation (see below)
  • Pulsed extraction voltage operation – effects on spectra
  • HFP gas jet
  • Optimize throughout of gas by varying position of gas jet (off-line 1st)
  • Optimize timing of gas nozzle valve to LCLS using iTOF
  • Vary sample density via nozzle withdrawl, backing pressure variation to see effect on signal, alignment, etc
  • HFP electron TOFs
  • Apply voltages to lenses
  • Apply voltages to eTOF detectors (dark counts, off-line)
  • Measure low KE electrons (Ne photoelectrons)
  • Optimize positions of all five TOFs
  • Optimize voltages on detectors
  • Optimize voltages on lenses (iterating these three)
  • Measure high KE electrons (Ne Augers)
  • Optimize voltages on lenses for maximum resolution, count rate
  • Measure moderate KE electrons (Ar Augers ?)
  • Optimize pressure for given focal volume – see broadening from charge ?
  • iTOF pulsed extraction operation – timing & effect on KE resolution
  • HFP Focus verification paddle
  • Remove iTOF & top eTOF to install focus verification paddle
  • Ensure limits are set to prevent damage to adjacent eTOFs
  • Imprint unfocussed beam and view with the microscope
  • Imprint focused beam & view with microscope
  • Move out of focus (chamber & paddle motion) & view
  • Optimize focusing
  • HFP vTOF (velocity map imaging TOF)
  • Replace iTOF with vTOF
  • Acquire signal using atomic sample (low extraction voltage)
  • Optimize position, voltages
  • Change to molecular sample (N2?) & acquire signal (high extraction voltage)
  • Optimize position, voltages
  • Try pulsed extraction voltage mode – image ?
  • Coincident measurements of N2 with vTOF
  • Diagnostics Beam Screens
  • Position downstream screen in beam
  • Measure samples of beam screen info for statistical analysis
  • Software available for position and extent determination?
  • Position upstream screen in beam – still see it on downstream screen ?
  • Measure samples of beam screen info from both screens
  • Diagnostics Magnetic Bottle
  • Current applied to solenoid – field ?
  • Voltages on detector – dark counts & image ?
  • Look for signal with high residual pressure from needle
  • Optimize position of the permanent magnet – looking at image
  • Optimize solenoid magnets
  • Optimize gas delivery
  • Spectra of low KE electrons
  • Spectra of high KE electrons
  • Test retarding field – tune solenoid magnets
  • Measure KE of electrons versus photon energy
  • Change focus to diagnostics position & repeat electron measurements
  • Diagnostics gas delivery
  • Optimize position of the needle in the beam
  • Optimize backing pressure for different foci
  • Effect of needle position on resolution of spectrometer
  • Laser
  • Bring laser beam into diagnostics chamber
  • Focus into interaction region of magnetic bottle
  • Overlap with FEL beam spatially/temporally
  • Measure side-bands – varying intensity & timing
  • 2nd or third harmonic ?
  • Bring laser beam into HFP chamber
  • Focus into interaction region of electron spectrometers
  • Overlap with FEL beam spatially/temporally
  • Measure side-bands – varying intensity & timing
  • 2nd or 3rd Harmonics & repeat
  • Diagnostics gas detector studies (Moeller)
  • Attach another gas detector to the instrument
  • Measure response at variety of different attenuator settings
  • HFP focusing studies (Jacek)
  • Replace ion TOF with camera mount
  • Install YAG screen on diagnostics paddle
  • Attenuate LCLS beam
  • Make measurements as function of position
  • Tune focusing of optics
  • Change focus to diagnostics chamber & measure
  • Return focus to HFP chamber & verify repeatability
  • HFP focusing studies (wavefront sensor)
  • Attenuate beam to prevent damage
  • Focus beam in HFP interaction region
  • Measure wavefront
  • Tune optics through iteraction
  • Verify with YAG screen diagnostic
  • HFP damage studies (Hau Riege)
  • Install sample(s) on beam focus paddle
  • Expose to single or multiple shots at various locations
  • Change attenuation & repeat
  • Change samples & repeat
  • HFP mTOF
  • Replace iTOF with mTOF
  • Acquire signals using atomic sample (low extraction voltage)
  • Optimize position, voltages
  • Change to molecular sample (N2?) & acquire signal (high extraction voltage)
  • Optimize position, voltages
  • Try pulsed extraction voltage mode – image ?
  • Coincident measurements of N2 with mTOF