A section of the LCLS accelerator with copper and orange components and a long experimental hall.

Measurement and models

Physics

Measurement, instrumentation, and models for systems where the uncertainty budget matters as much as the headline number.

LCLS quadrupole, SLAC National Accelerator Laboratory. Public domain.

The question

How do you build a measurement whose uncertainty you can defend, and how do you test a model against the data instead of against expectation?

What I work on

  • Instrument response and calibration
  • Noise, covariance, and error propagation
  • Computational models with tests
  • Experiments that can be repeated by another person

Current work

The TESS timing project is the first formal measurement: a detector model, an aperture, a noise budget, and a fit with a covariance.

The method work carries over to laboratory measurements: characterize the sensor, record the raw signal, and keep the calibration with the data.

Methods and standards

  • SI units and explicit conversions
  • Calibration records kept with the data
  • Covariance and sensitivity tests
  • Injection or recovery tests where they apply

Directions

  • Detector and sensor characterization
  • Low-noise readout and laboratory electronics
  • Computational physics with reproducible test cases
  • Small experiments designed around a stated uncertainty

All research areas. Notes and records are in the notes archive and the data and code index.