FNAL/ANL/UC SRF R

1
FNAL/ANL/UC SRF RD Collaborations

• Lance Cooley new SRF Materials Group Leader at
  FNAL

2
A Regional Center of Excellence effectively
started through the efforts of Pierre Bauer and
Claire Antoine

• Research topics concluding Oct-Dec 07
• Grain-boundary properties Polyanskii (ASC-FSU)
• Local nano-chemistry by 3D Atom probe Seidman
  (NU)
• Thermal conductivity and Kapitza resistance MSU
• Fundamentals of SC, theory A Gurevich
  (ASC-FSU)
• Topics proposed recently for SRF RD that are
  ripe for seeding
• Mapping the superconducting gap on Nb surfaces -
  M Iavarone (ANL)
• Atomic layer deposition applied to cavity
  surfaces M Pellin (ANL)
• Multilayer SRF structures M Pellin (ANL)
• Other topics that make sense to initiate
• Nanometer scale chemical kinetics and morphology
  of niobium oxidation S Sibener (UC)
• Magnetometry of Nb crystals, welds, etc. Welp
  (ANL)
• SRF theory Koshelev (ANL)
• formerly U Wisconsin Applied Superconductivity
  Center

3
Guiding vision

• Increase the vertical span of RD to utilize
  basic understanding, thereby accelerating
  progress and producing breakthroughs sooner
• Orbach SRF is an enabling technology. US
  leadership in SRF science strengthens our ability
  to put ILC on US soil.
• Marx panel Breakthroughs produced by the LTSW
  consortium far outweighed the AARD investment
  for high-field magnets, so use it as a model
• Develop understanding that underlies basic work
  at FNAL
• Seek understanding that further enables niobium
• End users and basic researchers need to speak
  common language
• Basic researchers work toward needs identified by
  end users
• End users gain access to knowledge first hand and
  prior to publication

4
Guiding vision

• Involve academia and BES labs
• Allow academic freedom within the context defined
  by end users
• Undertake measurement services separately
• 100k/yr is threshold for academic value
• Fill the researcher pipeline via student
  projects, Ph.D. theses
• Make SRF materials available to basic researchers
• Encourage round-robin and joint experiments among
  research groups using common samples
• Take advantage of complex probes, advanced
  facilities, and (most importantly) expertise
  outside labs
• An experienced researcher is worth more than the
  instrument
• Possibility of testing hypotheses on real
  cavities

5
Guiding vision

• Build long-term excellence
• Find pathways toward future breakthroughs outside
  of present ILC materials
• Basic understanding of surface superconductivity
• Integration of surface science with SRF
• Breaking the niobium monopoly

6
Tie-in to ILC

• FNAL is building a strong single cavity RD
  program, which will work in conjunction with
  9-cell pre-production, test, QA, and simulation
• Single-cell program is the entry point for basic
  understanding to the ILC knowledge chain
• ILC EDR must continue to consider alternates,
  which provide pathway for breakthroughs to
  positively affect cost and performance

7
There are many key scientific questions

• Fundamental
• How are oxygen oxides arranged and what happens
  to them during/after etching? Baking? Annealing?
• How does surface chemistry affect
  superconductivity? RF superconductivity?
• What new information can new surface probes
  provide?
• Are grain boundaries bad? If so, why? Are there
  mitigation strategies?
• Can multilayer coatings produce RF fields higher
  (and lower losses) than that possible with
  niobium?

• Practical
• Are present niobium specs adequate?
• What are the differences in raw sheets that
  matter?
• How deep does surface damage penetrate? Are
  present etching recipes sufficient?
• How are cold mechanical properties affected by
  processing (etching, annealing, welding)
• What is it about sulfur particulates that make
  them difficult to remove (after EP)?
• How can we prevent particle re-contamination and
  field emission ?

8
Talks by ANL and UC Investigators
9
Proposal SRF Center of Excellence

• Characteristics of regional collaboration are
  similar to those of NSF or DOE Center of
  Excellence
• Proposal leverage regional activities into
  sustained national effort of 2M/yr scale
• Target combined NSF (Goldberg) and HEP
  (Debenham)
• Charge Sustain progress on key scientific issues
  via
• Curiosity-driven research within end-use context
• Collaborative research with labs
• Interactions with industry and SBIR
• Management
• Annual or semi-annual workshop will be important
  for reporting
• Executive committee shall (re)identify key
  scientific issues based on needs and progress

10
Industry
SBIR
IIT
DOE NSF
Cornell
Exec. Committee
TJNAF
MSU
ANL
UC
FSU
Nwestern
FNAL
Network interchange of ideas and samples