1. High Level Physics Applications for LCLS Commissioning
Henrik Loos

2. Physics Applications Overview
Matlab framework for development
~35 applications developed by physicists
~30 with graphical user interfaces (GUIs)
Created and grown within last year
Development driven by commissioning needs
Quick adoption of new features

3. Application Types Diagnostics Status Displays Machine Control & Tuning
Profile Monitors
Wire Scanners
Emittance
Bunch Length
Correlation Plot
Cathode QE
Laser Pulse Length
Orbit Response
Status Displays
Operating Point
Orbit
RF Status
Beam Jitter
Beam Images
Machine Control & Tuning
Beam Line Switching
Bunch Compressor Control
Twiss Matching
Undulator Beam Based Alignment
Simulation
LiTrack
1D FEL Code

4. Physics HLA Launch Screen

5. Operating Point Primary definition for main machine parameters
Used as defaults for other applications
Electronic checklist
Compares actuals with set points
No machine control
H.-D. Nuhn

6. Linac Beam Jitter
Measures transverse beam jitter in injector and near end of linac
Display of jitter in terms of normalized phase space
Display of energy jitter thoughout machine
D. Ratner

7. RF Phase Scans Beam based measurement of all RF phases
Integrates Epics and SCP controls
Amplitude calibration and phase re-golding
Stores results in PVs for archiving
P. Emma

8. Twiss Parameter Matching
Gets Twiss from previous emittance measurement
Wire scanner or profile monitor
Applies solution to magnet settings
Will include undulator matching soon
C. Limborg

9. Dispersion Measurement
P. Emma
Orbit measurement after chicanes with varying beam energy
Calculates resulting emittance growth and corrector quad strengths
Applies correction

10. Bunch Compressor Control
Set R56 of chicane
Controls
Dipole strengths
Chicane motion
Matching quads
Upstream RF phases
P. Emma

11. Beam Diagnostics Application Hierarchy
Correlation Plot
Bunch Length
Emittance
Profile Monitor
Wire Scan

12. Common User Interface Features
Files
Configs
Measure
Export
Data Point

13. Image Acquisition Live image display Pixels or calibrated display
Line outs
Intensity histogram
Fit results
Interactive screen calibration

14. Wire Scans
Beam synchronous acquisition of wire position, PMT signals, charge, and beam position
Automatic set of scan range from BPM reading
Optional jitter correction and charge normalization
Applies set of fit algorithms to profiles
Add support for undulator beam finder wires

15. Bunch Length Measurement
Measures bunch length at various profile monitors using TCAV0 and 3
Scans TCAV phase for calibration.
Plot of measured images, profiles, and beam size fit.

16. Emittance Overview

17. Emittance GUI Features
Measures emittance at various profile monitors and wire scanners.
Uses quadrupole scan or acquisition at multiple locations (multi screen).
Projected emittance or slice emittance
Sets PVs for archiving and matching
Plot of measured profiles, beam size fit, and phase space view.
Add emittance measurement using undulator beam finder wires.

18. Correlation Plot Overview

19. Correlation Plot Features
Scans any epics process variable (PV)
Measures multiple samples of any number of PVs
Non-synchronous and synchronous acquisition
Scan of 2 PVs for 2-D plots
Scan of SLC magnets
Time scan
Measurement of emittance, bunch length, profile monitors, wire scanners
Selection of different fit functions
Plot of selected results

20. Applications for Next Phase
Beam-Based Alignment of the FEL Undulator - (Loos)
Undulator Steering and re-Pointing - (Nuhn)
K-measurement Application - (Welch/Emma/Nuhn)
Beam-Finder Wire Application - Centering & Emittance - (Loos/Nuhn?)
LTU Emittance Measurement - (Loos - extension of existing GUI)
Beta-Matching into undulator - (Limborg - extension of existing GUI)
FEE diagnostics - (see R. Bionta's talk)

21. Undulator Beam Based Alignment
Measurement of undulator orbit at 3+ energies
Fit of BPM & quad offsets and orbit
Changes BPM offsets
Moves quads with undulator girders
Launches beam into undulator
Integrates simulation
Orbit
Preliminary
Simulation
Offsets
Measurement

22. FTIR Spectrometer for Micro Bunching Studies
Filters
Detectors
Mirrors
Paraboloid
Radiation
Splitters
Interference
Signal
Sum
Modified BL21
Existing BL21 Layout
Filters
Detectors
Paraboloid
Radiation
Splitter

23. Spectrometer Details Upgrade for BL21 Edge radiation monitor after BC2
Compatible with present use
At center position, both detectors see the same intensities as presently
Resolution
Scan range L = 10mm
Step size ΔL = 5μm
Δν = 1/(2L) = 0.5 cm-1
νmax = 1/4ΔL = 250 cm-1
Spectral range = [20μm – 20mm]
Issues
Converging beam in spectrometer
Different phase front curvature will suppress interference

24. Summary
Migration of applications from physicists to software group
Matlab applications were developed in interaction with control room needs
Existing Matlab applications are used to define software requirements
Gradual replacement from lower level apps (e.g. wire scan) to highest level (e.g. correlation plots)