The NSLS-II Powder Diffraction Beamline Design. Eric Dooryh é e and Andy Broadbent, Experimental Facilities Division, NSLS-II , with acknowledgements to the staff at ACCEL Instruments, and members of the BAT Experimental Facilities Advisory Committee Meeting April 23-24, 2009. Outline.
The NSLS-II Powder Diffraction Beamline Design
Eric Dooryhée and Andy Broadbent,Experimental Facilities Division, NSLS-II , with acknowledgements to the staff at ACCEL Instruments, and members of the BAT
Experimental Facilities Advisory Committee Meeting
April 23-24, 2009
Introduction to Eric Dooryhée (XPD Group Leader)
Scientific Mission and Requirements (Eric Dooryhée)
Beamline Design Iteration (Andy Broadbent)
Current Optical Layout
Issues and conclusions
Use the brightness of NSLS II
flux demanding - high throughput - high time resolution
high angle resolution (structure solving, microstructure)
beam focusing down to ~50μm (high spatial resolution)
Use the high energy spectrum of the damping wiggler
sample environments (non-ambient, in-situ, in-operando)
high Q (PDF) on simultaneously operating side branch
access K-edge of heavy elements (contrast diffraction)
Courtesy of SLS and ASP
Rotation stage for high energy resolution crystal analysers, 1µradian resolution 10µradian accuracy.
Standardized interface plate, supports 35kg at the sample position.
Robot for automated sample changing (not shown).
Custom Ge based strip detector with 100°coverage. 250µradian resolution on 0.5m radius.
Support table for intermediate weight sample environments (~100kg)
High resolution (“multi-modal”)
Courtesy of Chiu Tang DIAMOND
Off-plane diffraction analyzer (patent 2007)
High Energy Micro-Diffraction
commercially available CRL set-up of Prof. Lengeler (Aachen)
in use at NSLS X17 and tested at X7bDr. Z. Zhong design
Vertical focusing (or collimation) with CRLs, dE/E~1x10-4, Si
A key requirement of the User community is to provide for fast changeover of samples and environments.
Typical experiments may include gas rigs, high-pressure, high or low temperatures....
Laue or Bragg single bounce mono (~4 degree deflection)
with horizontal focusing,
Vertical focusing with CRLs,
Fixed energy at 80 keV,
Energy resolution of ~4 x 10-3 allowable
The only high-resolution instrument in the US capable of collecting data at high energies ( 40 keV to 100 keV) ideal for high-Q data and in situ and time resolved studies in environmental cells.
Combining complementary analysis probes, e.g., micro-raman
Investigation and development required on:
beam filtering and DLCM : heat load, band pass,...
deflecting side bounce monochromator (including cooling scheme)
focusing : mono and CRLs
Detector development e.g. Siddons’ work on Ge strip array
Start work on software requirements and sample environments
Conceptual design report due end Sept 2009.