Meeting with Diling

Nov. 12, 2021 and Nov. 18, 2021

Detectors

Nov. 12, 2021

2 hutch wave8's
1 user wave8
minimum 4 ideally 8 hsd channels 4 cards
can we run 4 channels at 3.2GHz? yes
10kHz full hsd wf's
worried about ringing signal peaks @1MHz (answer: set number of samples)
1 epix10khr 2M
4 or 6 small sparkpix 50um px (thresholding per pixel, 1% occupancy) or few epix10khr
low rate (kHz for small roi) 1Mpixel optical (opal/zyla replacement)
noise performance target: https://axiomoptics.com/low-light-cameras/orca-quest-qcmos-camera/?gclid=CjwKCAiAvriMBhAuEiwA8Cs5lVZr2oRyK4IeQ2DmeYRPhVgmb45QZLiJkxzDK_cBFH9Q5asWHDQ7HBoCo5MQAvD_BwE
piranha camera for timetool, maybe don't need shot to shot?  1kHz? low rate problem for MPI.

Slack question on running hsd's at higher rate than area detectors:

To make sure I’m clear: you might run hsd’s at 1MHz?
Diling Zhu  5:41 PM
if the beam rate is 1MHz, i can definitely think of scenarios, assuminging
area detectors can integrate

Data Reduction

Nov. 18, 2021

hope for pump-probe timing stable so we can average shots in the drp (1000)

expt types:
liquid chemistry
- normalize image using the beamline i0 (wave8, or small epix, or a big epix)
- cube (with binned images or ROI) potentially with 2Mpx by 100 or 200 bins
- bin w.r.t pump-probe from timetool, but could also have 2 laser pumps, and
  photon-energy (hypercube)
- optional image processing before binning: pie-slicing (S(q) traces), droplet,
  projection to get spectrum
  with thresholding (better signal to noise), fit photon positions
- only filter on mono using wave8 and beam position (50% now, less in future)
- no per-shot reading of mono position
- less interested in redundant pie-slicing and cube than tim van driel (more
  spectroscopy, less scattering since xpp is monochromatic (lower flux)).
- 5kHz 2026 25kHz 2028
- if time stability is good lose the need for rate: write out summed images at
  lower rate: kHz to 10's of hz.
  o feedback from timetool could help from that
- if hypercube gets too many bins can make turn it into a 1D image with angular
  integrations

emission spectroscopy:
- projection to get spectrum (perhaps not along a line: parabola?)

users need a hook to do other image processing (e.g. for "visible spectroscopy")