CHX:Hints

This page provides brief notes/hints for using the CHX beamline at NSLS-II.

General

Status

• NSLS-II machine status (twitter)
• CHX olog

Contact

• Beamline: x1411
• Floor coordinator: x5046
• Control room: x2555

Controls

NSLS-II Control Software

ophyd

• Start:
  • cd ~
  • ./ophyd
• Examples:
  • wh_pos() : motor positions
  • mov(diff_xh, 1.0) : move motor
  • movr(diff_xh, -1.0) : relative motion
  • movr([diff_xh, diff_yh], [-1.0,-1.0]) : multiple motions

Control System Studio (CSS)

• Start:
  • run-css &
• Use:
  • Ctrl+mousewheel : zoom

Replay

• ./replay
• Allows access to log entries and graphs.

Instrument

Sample Motion

• Sample motion uses diffractometer. Sample stage is on "horizontal controls" (diff_xh, diff_yh).
  • diff_xh : moves sample inboard/outboard.
    • Positive motion moves sample outboard (left, beam POV); i.e. beam moves right along sample.
    • Negative motion moves sample inboard (right, beam POV); i.e. beam moves left along sample.
  • diff_yh : moves sample up/down.
    • Positive motion moves sample up; i.e. beam moves down along sample.
    • Negative motion moves sample down; i.e. beam moves up along sample.
  • diff_zh : moves sample along beam.

• Diffractometer also has stages on a "vertical" tower. Because these stages are sitting on a rotation axis (delta-like rotation), their translations (relative to sample) depend on delta.
  • diff_xv : moves sample inboard/outboard.
    • Positive motion moves stage outboard (left, beam POV); i.e. beam moves right along object.
    • Negative motion moves sample inboard (right, beam POV); i.e. beam moves left along object.
  • diff_yv : moves sample up/down. Assuming rotation stage is 180°:
    • Positive motion moves sample down; i.e. beam moves up along sample.
    • Negative motion moves sample up; i.e. beam moves down along sample.
  • diff_zv : moves sample along beam.

WAXS Detector Motion

• delta : goniometer arm arcing up
  • Positive motion rotates RH (axis +vertical), a.k.a CCW (top POV); moves a downstream object left (beam POV); i.e. beam moves right along object.
  • Negative motion rotates LH (axis +vertical), a.k.a CW (top POV); moves a downstream object right (beam POV); i.e. beam moves left along object.
• gamma : goniometer in-plane rotation
  • Positive motion rotates arm RH (axis +outboard), a.k.a CCW (sample POV); moves a downstream object down (beam POV); i.e. beam moves up along object.
  • Negative motion rotates arm LH (axis +outboard), a.k.a CW (sample POV); moves a downstream object up (beam POV); i.e. beam moves down along object.

Detectors

X-ray Eye

• Visualization of direct x-ray beam.
• Fluorescent crystal being imaged by conventional CCD camera.

WAXS Detector

• Eiger1M
• To start:
  • Array callbacks: Enable
• To debug:
  • http_proxy= google-chrome
  • http://10.11.1.3/data/
• Saves data as HDF5

Other

Logging (Olog)

• https://controlsweb01.nsls2.bnl.gov/logbook-chx/

Cameras

• camonitor
• XF:11IDB-BI{Cam:08}Stats1:Total:RBV
• http://xf11idb-cam1.cs.nsls2.local/view/index.shtml