Sample¶
The 8-ID-E six-circle diffractometer and the 8-ID-I XPCS sample endstation. First cut; PVs read from the beamline config, carried confirm.
8-ID has two sample-side endstations: the six-circle Huber diffractometer at 8-ID-E, and the XPCS sample stack at 8-ID-I (Aerotech translation, a rheometer shear-cell, and temperature-controlled holders). They are modelled as sample-stage groups in the descriptor.
The diffractometer device binds the catalog Goniometer Family for its sample circles; the composed Assembly(Diffractometer) is in the catalog and materialized by the integration scenario (see Model). The beam-position monitor binds a loose Family held for gate-review (8-ID is the second independent beamline to use it, but the abstraction is open); the temperature controllers bind the now-graduated TemperatureController catalog Family (presents Regulator, #350); the rheometer binds a loose Rheometer Family.
The six-circle diffractometer (8-ID-E)¶
A Huber six-circle diffractometer orients a single crystal through six rotation circles and scans reciprocal space via hklpy2.
| Device | Family | Design spec / note |
|---|---|---|
Diffractometer_SixCircle |
Goniometer |
six circles mu / eta / chi / phi / nu / delta + x/y/z; bound as the goniometer of the Diffractometer Assembly (DIFF-1) |
ReciprocalSpace |
PseudoAxis |
hklpy2 reciprocal-space layer (psic); partition rule is DIFF-2 |
TemperatureController_1/2 |
TemperatureController |
LakeShore 336 controllers (TEMP-1) |
BeamPositionMonitor_E |
BeamPositionMonitor |
Sydor TetrAMM monitor (BPM-1) |
FastShutter |
Shutter |
gates the exposure (XPCS-1) |
The six circles (mu, eta, chi, phi, nu, delta) are the strongest evidence for the Assembly(Diffractometer) slot shape; together with 4-ID's diffractometers they set sample_circles at cardinality OneOrMore (see Model).
The XPCS sample endstation (8-ID-I)¶
| Device | Family | Design spec / note |
|---|---|---|
SampleStage |
LinearStage |
Aerotech three-axis sample positioning |
Rheometer |
Rheometer (loose) |
six-axis shear-cell sample environment (SAMPLE-1) |
SampleHolder_QNW |
TemperatureController |
Quantum Northwest temperature-controlled holders, three units (TEMP-1) |
SampleSlit |
Slit |
sample-defining slit |
The UR5 robotic sample changer is present in the beamline config but not modelled in this cut (SAMPLE-2); CORA has no sample-changer shape yet.
See Open questions for the diffractometer and sample-environment facts still to confirm, and Inventory for the Asset tree.