Asymmetric Analyzer

An asymmetric analyzer filters emitted X-rays by wavelength. In contrast to a traditional analyzer, an asymmetric analyzer can use reflections besides the specular reflection for re-directing photons.

The device haven.devices.asymmotron.Analyzer contains all the math to control an individual analyzer crystal.

The following diagram shows the signal flow. Note that config signals are local: changing them in one environment (e.g. Firefly) will not affect any other environment (e.g. Queueserver).

Diagram of asymmetric analyzer signals in the Analyzer device. Config signals can be modified without moving physical motors. Positioner signals will move physical motors when changed.

The device can be moved by setting the config signals to their desired values, then setting energy to move the analyzer:

from bluesky.plan_stubs import mv
from bluesky.plans import scan
from ophyd_async.core import init_devices
from haven.devices import Analyzer
from haven import run_engine

RE = run_engine()

# Create, and connect to, the analyzer device
with init_devices():
    analyzer = Analyzer(
        horizontal_motor_prefix="255idcVME:m1",
        vertical_motor_prefix="255idcVME:m1",
        yaw_motor_prefix="255idcVME:m1",
        name="herfd_analyzer",
    )

# Set up the configuration signals
RE(mv(analyzer.reflection, "211"))

# Perform a scan for data acquisition
detectors = [...]
RE(scan(detectors, analyzer.energy, 8000, 8300, num=31))