| RESPONSIBLE STAFF: | Bart Johnson
- technical support
John Arthur - scientific support |
| MIRROR: | Bent cylinder, Single crystal Si, Rh-coated
Radii: 2945 m (adjustable) x 56.1 mm Mean angle of incidence: 4.36 mrad Cut off energy: 14.5 keV Magnification: 1.0 |
| MONOCHROMATOR: | Two crystal, Si(111), Si(220) available
Upward reflecting |
| ENERGY RANGE: | 2,400 eV - 15,500 eV focused
2,400 eV - 45,000 eV unfocused |
| HORIZONTAL ANGULAR
ACCEPTANCE: |
0 - 1.2 mrad focused
0 - 1.0 mrad unfocused |
| SPOT SIZE: | 0.27 mm x 2.3 mm (FWHM) focused
2 mm x 20 mm unfocused |
| ABSORPTION: | 546 micron Be
2,4 m He 15.2 micron C |
| WIGGLER: | 18.0 Tesla
4 periods |
| INSTRUMENTATION: | Computer:
Digital AlphaStation 500/266 w/21" monitor 96 Mb main memory 2 SCSI disk drive CDROM, 3.5" floppy Kinetic System Corp. Grand Interconnect Ethernet controller CAMAC crate: hex scaler, real time clock, stepping motor controllers (2), up-down counters, digital to analog converter NIM Electronics: voltage to frequency converter (2) amplifiers, SCAs, rate meters Detector: ion chambers (2), current amplifiers (2) sample positioners (1), PMTs (2), Ortec Ge detector (1) motorized slits: symmetric opening, (2 sets) Diffractometer Control Software: SUPER |
| INTERIOR HUTCH DIMENSIONS: | 2.4 m long x 2.9 m high x 2.4 m wide |
| RESEARCH: | Station has dedicated 6-circle diffractometer |
A Huber 6-circle diffractometer is permanently installed on Bl7-2 for high-resolution x-ray scattering research. The six spectrometer degrees of freedom are (theta,chi,phi) for the sample, and (2-theta, theta-analyzer,2-theta-analyzer) for the detector. In addition, the input wavelength can be scanned, and the spectrometer coordinates can be remotely adjusted. Software is available for scanning between an arbitrary pair of reciprocal lattice vectors.
Because of high demand, research is confined to problems that can only
be addressed with this unique facility. Typical programs involve intrinsically
weak scattering systems, such as two-dimensional arrays and high-resolution
3-D problems.
Updated January 5, 2000
Bart Johnson