1. l 66TH MEETING OF THE ESRF l 30-31 May 2014 l Author

2. HPLF software needs High Power Laser Facility on ID24 (EXP/MEx)
HPLF description:
1 laser hutch (clean room independent of CC, OH and EH)
laser Front-End and Amplifiers
laser beam path to EH1
final configuration operation from 2020
test configuration from april 2018 to dec 2018 shutdown
remotely operated from CC
most mirrors, pinholes, beam shutters, beam attenuators etc. will be motorized
many cameras (a dozen?, most likely Basler acA gm* or any GigE monochrome)
at least 6 viewed simultaneously
operation at full resolution?, >5 Hz, 8bit using CW laser for alignment
operation at full resolution?, 0.5 Hz or 0.1 Hz, 8bit using pulsed laser
operation at full resolution, single shot, 12bit on laser shot
live and post image processing (see next slides)
Basler acA gm: 1296×966, 12bit, 1/3”≡4.9×3.6mm², 1px=3.75×3.75μm²
HPLF cameras and image processing — sept 2017 — N. Sévelin-Radiguet

3. HPLF software needs – live image processing
Camera purpose is to monitor beam transport from laser room to EH1
located at different positions along beam transport (image through mirror leakage)
mostly work in pair: 1 for Near Field (beam shape and centering of energy wrt aperture), 1 for Far Field (beam axis and ‘phase’)
Required live image processing:
Color LUTs
ability to change camera gain, integration time, binning on the fly (to optimize dynamic range)
detector center + beam centroid
fits along 2 perpendicular line-outs (with detection of beam rotation)
Super gaussian (beam shape is expected to be SG with order ≥ 8, with 90% of encircled energy within the pre-defined diameter) or Airy functions
fit parameters display
radius at arbitrary height with user-adjusted scale (px to real lengths) depending on optical design,
supergaussian order,
ellipticity
ROI
encircled energy
at arbitrary height (likely at Half Maximum and 1/e²)
given arbitrary encircled energy fraction, what is the radius|diameter of the beam|focal spot
HPLF cameras and image processing — sept 2017 — N. Sévelin-Radiguet

4. Post processing needs
Using a full resolution image (or a pre-recorded sequence of images) from the user, same as live image processing plus:
scatter plot of centroids of each image
std deviation of this distribution in both direction (on far field images ≡ beam pointing stability)
could be made live for a specified number of images? (plot of beam pointing vs time?)
spatial frequency analysis
laser specifications are the following:
spatial frequencies ≥ 2 mm⁻¹: ≤ 5% RMS
0.2 mm⁻¹ ≤ spatial frequencies ≤ 2 mm⁻¹: ≤ 20% RMS
spatial frequencies ≤ 0.2 mm⁻¹: ≤ 10% RMS
HPLF cameras and image processing — sept 2017 — N. Sévelin-Radiguet

5. Examples Simulated near field: Simulated far field:
SG order 8, FWHM = 85 mm
linear scale
log scale
HPLF cameras and image processing — sept 2017 — N. Sévelin-Radiguet

6. Mockup (full resolution view)
1920×1080 screen
camera of interest
1296×966 image
full resolution
full pixel depth
camera selection (drop down list)
camera setup
parameter setup
fits and measurements
additional graphs
in tabs?
current mode / acquisition rate
next image in X seconds
cams status
HPLF cameras and image processing — sept 2017 — N. Sévelin-Radiguet

7. Mockup (mosaic view) 1920×1080 screen Front-End NF Amplifier NF
1296×966 image
resolution/4
→ 648×483
1296×966 image
resolution/4
→ 648×483
1296×966 image
resolution/4
→ 648×483
Front-End NF
Amplifier NF
Experimental Hutch NF
1296×966 image
resolution/4
→ 648×483
1296×966 image
resolution/4
→ 648×483
1296×966 image
resolution/4
→ 648×483
Front-End FF
Amplifier FF
Experimental Hutch FF
virtual crosshair ≡ alignment reference position → when FF centroid is on it, alignment is correct
HPLF cameras and image processing — sept 2017 — N. Sévelin-Radiguet

8. Network usage for 1 acA 1300-30gm camera: For 6 cams simultaneously:
Network usage = pixel height × pixel width × pixel depth × refresh rate
10Hz: 1296 × 966 × 8bit × 10Hz = 12.5 MB/s (i.e. maximum of a 100Mbit link)
5 Hz: 1296 × 966 × 8bit × 5Hz = 6.3 MB/s
For 6 cams simultaneously:
using CW alignment laser, 5 Hz: 6× 6.3MB/s = 37.6 MB/s ← requires 1Gbit link
if resolution/4 (mosaic view): 6× 1296/2 × 966/2 × 8bit × 5Hz = 9.4 MB/s ← OK for 100Mbit link
using pulsed 0.5 Hz: 3,76 MB/s
on-shot (every 10 min): 6× 1296 × 966 × 16bit = 15MB
maybe more cameras on-shot
HPLF cameras and image processing — sept 2017 — N. Sévelin-Radiguet

9. what — when — N. Sévelin-Radiguet