Plans for NSLSII

First usable light
~2013.
Location
across the street from NSLS, next to Center for Functional Nanomaterials.
Project cost
roughly $800 million.
Planned operations overlap
6-12 months before shutdown of NSLS.
Ring
3.0 GeV, 500mA, 790m circumference with top-up fill. 30 segments with alternating 5m and 8m straight sections.
Main goal
high brightness and stability.

The issue of “facility” vs “PRT” beamlines remains unresolved.

Only a small handful of beamlines are included in the construction project, some will be moved from NSLS to NSLS-II, and others will be funded by BES and ??? There will be a call for Letters of Intent for beamlines soon, probably later May or June.

Source types

  1. undulators for high-performance specialized beamlines
  2. “damping wigglers” used to condition the electron beam for the undulators:
    • Peak flux 5e15 ph/sec/0.1%bw/mrad at 3kev,

    • flux >=10% of peak up to 35 keV (usable flux >=1% of peak up to 65 keV)

    • (compare NSLS bend peak 1.5e13 at 2.5 keV, 10% of peak up to 25 keV)
    • (compare APS bend peak 1.8e13 at 8 keV, 10% of peak up to 75 keV)
    • (compare ALS bend peak 2e13 at 1 keV, 10% of peak up to 12 keV)
    • Brightness 2e18 ph/sec/0.1%/mrad2/mm2
    • (compare NSLS bend 1e14, APS bend 8e15, ALS bend 2e15)
  3. “soft bends” required to maintain electron beam quality:
    • Flux peak 3e13 at 0.8 keV, 10% of peak up to only 8 keV
    • Brightness 2e16
  4. wide-gap soft bends (10 ports) for IR, equivalent roughly to current NSLS VUV ring beamline U10B
  5. 3-pole mini-wigglers, added to design due to the lack of standard-energy conventional beamlines, these are the equivalent of NSLS bends and would be inserted at ends of soft bends. Hard bends can not be used in current design.
    • Flux peak 3e13 at 2.5 keV, 10% of peak up to 25 keV
    • Brightness 6e15
  6. a possible high-energy superconducting wiggler is under consideration:
    • Flux peak 1e15 at 15 keV, 10% of peak up to 130 keV (usable to 250)
    • Brightness 1.5e18

Beamlines currently in the works

  1. the flagship beamline: a hard X-ray “nano” probe (target spotsize is 1nm)
  2. soft X-ray STXM
  3. various materials science and physics scattering beamlines
  4. bulk EXAFS
  5. protein crystallography
  6. conventional microprobes.

PaulNorthrup is involved in planning for NSLS-II beamlines through the BNL EnviroSuite Program, Environmental Sciences Department, NSLS, and NSLS-II.

The best ERSD applications at NSLS-II will likely be in the lower energy ranges, and for imaging techniques. These will be developed within existing programs at the NSLS and transitioned to NSLS-II. Some scattering applications requiring very low beam divergence would do well at NSLS-II, but there is currently no such environmental research or user program here at NSLS to build from.

The Conceptual Design Report is now accessible at http://www.bnl.gov/nsls2/project/CDR/ and provides considerable detail (but is somewhat outdated already).

Questions and Comments

  1. BruceRavel asks: What is meant by "conventional nanoprobe"? 5-ish micron spot, like KB mirrors on an undulator source? Will there be zone plates for 100 nanometer spot size?

  2. BruceRavel asks: What will be the highest practical energy at which XAS can be done on a 3-pole wiggler? It sounds like there won't be many photons at, say, the U L3 edge.

  3. BruceRavel asks: Is there any plan to develop an energy scanning capability at the nanoprobes, which will presumably have chromatic optics?

  4. PaulNorthrup answers:

    1. the flagship nanoprobe would use zone plate type optics for 1nm beam (in theory). Conventional microprobes would use KB mirror optics on 3pole wiggler or damping wiggler sources for 0.5 to 5 micron beams with broad energy scanability.
    2. the 3pole wigglers would theoretically produce beam of 2x higher flux and ~50x higher brightness than current NSLS bends, over essentially the same energy range. U L3-edge exafs would be OK as at the NSLS, although flux does peter out by 25 keV or so. A damping wiggler source would be better, to 55 KeV or so (depending on monochromator rather than source at that point).

    3. That will be a grand challenge: maintaining focus and position while scanning energy... needs quite a bit of R&D but it is being pursued.

EnviroSync/NSLSII (last edited 2007-04-17 18:21:53 by BruceRavel)