4-ID-D - Sector 4
Hard X-ray Polarization Dependent Scattering and Spectroscopy
Overview
      4-ID-D is the hard x-ray (2.8 keV -> 50 keV) branch of sector 4.   While it's primary focus is on experiments which involve the manipulation and analysis of either incoming or scattered x-ray beams, it is equiped for conventional diffraction experiments also.  It utlizes the APS standard undulator A as a source . 
 
Responsible Scientists
  • Daniel Haskel, phone: (630) 252-7758, fax: (630) 252-7392, e-mail: haskel@aps.anl.gov 
  • Zahir Islam, phone: (630) 252-9252, fax: (630) 252-7392, e-mail: zahir@aps.anl.gov 
  • Yejun Feng, phone: (630) 252-7780, fax: (630) 252-7392, e-mail: yejun@aps.anl.gov  
 
Scientific Interests
  • X-ray magnetic circular dichroism. 
  • Resonant and Non-Resonant magnetic x-ray scattering form single crystals. 
  • Diffraction in applied magnetic fields
  • X-ray magnetic reflectivity studies. 
     
 
Source Characteristics
Standard APS Undulator A
No. of Poles 72
Undulator Period 3.3 cm
Device Length 2.4 m
Minimum Gap 9.5 mm
 
Optical Components
Component Distance from Source Comment
White beam slits (L5-90) 51.80 m Maximum size  6.0 mm x 4.0 mm  (Horiz. x Vert.)
Kohzu double crystal mono. 54.63 m LN2 Cooling. Variable Offset. Energy Range 2.8to 50keV with Si (111) . 
Phase Retarders 56.95 m Diamond crystals of various thinknesses. 
Focussing Mirror 58.62 m Incident angle 1->6 mrad. 
Variable vertical focussing. 
Two grooves for horizontal focusing. 
Flat Mirror 60.64 m Incident angle 1->6 mrad. 
Mono slits 72.01 m Maximum size 10.0 x 160.0 mm (Horiz. x Vert.)
 
Beamline Configuration

  The first optics enclosure (FOE, 4-ID-A) houses the optics used to seperate the C- and D- branch x-ray beams.  All the major optical components for the D-branch (listed above) are located in the 4-ID-B station.

  Experiments on the hard x-ray D-branch are conducted in the 4-ID-D experimental station. The center of this station is 75 m from the center of the ID straight section. The station is 5 m is length (along the beam path) and 3 m wide. The station is capable of recieving both monochromatic beam(normal operation) and white (special operation) beam.  The offset of the monochromatic beam is variable from 10mm to 35mm above the white beam.
 
Beamline Control
The beamline is run by Sun workstations (UNIX/Solaris) and VME-based electronics. The VME-based equipment is controlled by EPICS. There are several software clients that use EPICS, including MEDM and SPEC. Other computers, such as PCs, are used to run specialized pieces of equipment (e.g., the CCD camera).
 
Detectors
  • NaI scintillation counters   (Oxford-Cyberstar)
  • YAP scintillation counter   (Oxford-Cyberstar)
  • APD detector
  • Ionization chambers 
  • Ge Solid State Detectors  (Canberra)
  • Si drift diode Detectors  (Vortex)
  • CCD Camera  (Princeton Instruments, 1024x1024)
 
Ancillary Equipment
  • 8-circle Huber diffractometer 
  • 4.2 -> 325K Displex
  • 10K -> 800K Displex
  • He flow cryostat
  • 4 Tesla horizontal & vertical cryogen free magnets for diffraction
  • 2 Tesla spectroscopy electo-magnet
  • High Pressure Cells (to 20 GPa) for spectroscopy and diffraction. 
 
Milestones
Milestone Date Comment
First beam in 4-ID-A August, 1999  
First beam in 4-ID-B April, 2000  
First monochromatic beam. May, 2000  Diamond (111)
First beam in 4-ID-D August, 2000  
First Publication Jan. 2001 J. Pollmann, J. Appl. Phys. 89 7165 (2001)
First focussed beam in 4-ID-D May, 2001  250 micron x 100 micron  (Horiz. x Vert.)
First Physical Review Letter Sept. 2001 D. Haskel, Phys. Rev. Lett. 87 207201 (2001)

Posted by: Becki Gagnon ( gagnon@aps.anl.gov)
Content by: Jonathan Lang ( lang@aps.anl.gov)