C1 Pdf: Endstation

All calibration files are automatically saved in the directory with timestamped JSON headers. 6. Data Management | Item | Details | |------|---------| | Raw Data Format | HDF5 ( .h5 ) with detector frames, motor positions, timestamps, and EPICS PVs. | | Metadata | Sample ID, user name, proposal number, environmental parameters (T, P, gas composition). | | Online Reduction | SAXSplot for SAXS, GSAS-II for diffraction, xaspy for XAS. | | Storage | 10 TB local RAID + automatic backup to the facility’s long‑term archive. | | Export | Single‑frame CIF/CBF, CBF for diffraction; .dat/.csv for scattering intensity. | 7. User Access & Proposal Workflow | Phase | Description | |-------|-------------| | Proposal Submission | Submit via the facility’s online portal (deadline 4 weeks before beamtime). Include experiment type, sample environment, detector configuration. | | Safety Review | Completed by the radiation safety officer; requires risk assessment for hazardous chemicals, cryogens, high pressure. | | Pre‑Visit Checklist | Confirm sample mounting hardware, provide CAD drawings if custom mounts are needed. | | On‑site Training | 30‑minute safety briefing + 1‑hour hands‑on tutorial on the Endstation C1 control GUI. | | Beamtime | Remote (via VPN) or on‑site operation; support staff present 24 h for troubleshooting. | | Post‑Processing | Users receive a copy of the raw data and a “quick‑look” reduction; further analysis can be done on the user’s own cluster. | 8. Troubleshooting – Frequently Asked Questions | Issue | Symptom | Quick Fix | |-------|---------|-----------| | Detector Saturation | Over‑exposed spots, flat‑top intensity. | Reduce exposure time, insert additional attenuators, increase sample‑detector distance. | | Beam Drift | Sample moves out of the beam during long scans. | Re‑run find_beam_center.py every 30 min; enable beam position feedback (if available). | | Temperature Instability | ±2 K fluctuations in cryostat. | Verify cryogen flow, check temperature controller PID parameters, ensure good thermal contact. | | Pressure Leak | Pressure reading drops during high‑pressure experiment. | Tighten O‑rings, replace worn seals, check for blocked vent lines. | | Software Crash | GUI freezes, no new frames saved. | Restart the EPICS IOCs ( ioc_restart script), clear the HDF5 buffer ( h5clear ), contact beamline staff if persistent. |

For any further assistance—whether you need a custom sample environment, help with scripting the acquisition, or endstation c1 pdf

(Insert photo or CAD rendering – “Figure 2: Endstation C1 layout with detector rail and sample table.”) | Experiment Type | Sample Environment | Detector(s) | Typical Acquisition | |-----------------|-------------------|-------------|----------------------| | High‑Resolution Powder Diffraction | Capillary (0.5 mm) or flat plate | Pilatus 6M | 1–10 s per frame | | Small‑Angle X‑ray Scattering (SAXS) | Flow‑cell, temperature‑controlled cuvette | Eiger 9M + Pilatus 6M (SAXS/WAXS) | 10 ms–1 s per frame | | X‑ray Absorption Spectroscopy (XAS) | In‑situ electrochemical cell | Pilatus 6M + fluorescence detector | 0.5 eV energy step | | Time‑Resolved Pump‑Probe | Laser‑pump (fs–ns) + X‑ray probe | Fast CCD (single‑photon counting) | Sub‑µs gating | | High‑Pressure Diffraction | Diamond anvil cell (DAC) up to 150 GPa | Pilatus 6M (high dynamic range) | 0.1–5 s per exposure | 5. Alignment & Calibration Procedures | Step | Action | Tools | |------|--------|-------| | 1. Beam Centre | Scan a thin metal foil (e.g., Au) across detector to locate direct beam. | Pilatus 6M, Python script find_beam_center.py | | 2. Detector Distance | Use a calibrated Si standard (NIST SRM‑640c). Fit lattice spacings to obtain distance. | pyFAI calibration routine | | 3. Sample‑to‑Detector Geometry | Verify detector tilt (tilt_x, tilt_y) via 2‑θ ring analysis. | cctbx or GSAS-II | | 4. Energy Calibration | Measure absorption edge of a reference foil (e.g., Fe K‑edge). | XAS scan with xaspy | | 5. Motor Offsets | Record zero positions for θ, φ, χ after sample mounting. | EPICS PVs ( MOTOR:THETA:ZERO ) | All calibration files are automatically saved in the