O AK R IDGE N ATIONAL L ABORATORY U. S. D EPARTMENT OF E NERGY 1 SNS 2 Meeting Opening Remarks, Purpose Glenn R. Young Physics Division, ORNL August 28, 2003

O AK R IDGE N ATIONAL L ABORATORY U. S. D EPARTMENT OF E NERGY 2 Why Are We Here?  SNS makes large flux of neutrinos  These are in an interesting energy range for nuclear physics and astrophysics  Experimenters are obstreperous people who believe you should never take a theorist's word for it on cross sections

O AK R IDGE N ATIONAL L ABORATORY U. S. D EPARTMENT OF E NERGY 3 Making the Science Case  Does this impact our understanding of  nuclear structure  neutrino cross sections  supernovae explosions  nucleosynthesis  Can you define science goals and a measurement program?  Which cross sections are most interesting?  Which provide the biggest "sensitivity" for our understanding of physics?

O AK R IDGE N ATIONAL L ABORATORY U. S. D EPARTMENT OF E NERGY 4 Does It Pass the Ha Ha Test ?  Given the input parameters - neutrino flux - "1 year" of SNS running - reasonable volume of detector - expected cross sections - active fraction of volume  Do you get an interesting number of events?  How many cases can you handle in 10 years?

O AK R IDGE N ATIONAL L ABORATORY U. S. D EPARTMENT OF E NERGY 5 Does It Pass Practical Factors Checks ?  Can it find a permanent home at the SNS?  Can you change the "target" in a reasonable length of time? - how long to run one target? - how long physically to change target material?  Can you allow for both segmented and homogenous detectors?  Can you load 2 targets simultaneously? i.e., run 2 detectors?  Can you stay under a few $M?

O AK R IDGE N ATIONAL L ABORATORY U. S. D EPARTMENT OF E NERGY 6 Can You Define a Detector Suite?  What are the scales of the detectors?  Passive vs. active volume  Shape  Technology  ”Channel counts"

O AK R IDGE N ATIONAL L ABORATORY U. S. D EPARTMENT OF E NERGY 7 Can You Handle Shielding?  Background rates and composition  Signatures of background events?  Shield concept?  Mass?  Floor loading?  Resultant errors on physics measurements?

O AK R IDGE N ATIONAL L ABORATORY U. S. D EPARTMENT OF E NERGY 8 What are the Interfaces with the SNS?  Space  Services  People  Run cycle  Evolution of beam energy, intensity  Monitoring of power, neutrino flux and fluence

O AK R IDGE N ATIONAL L ABORATORY U. S. D EPARTMENT OF E NERGY 9 How Long Do Things Take?  How long to design  to build  to commission  to do one target  to change targets

O AK R IDGE N ATIONAL L ABORATORY U. S. D EPARTMENT OF E NERGY 10 Can a Collaboration Be Formed?  Who  How many people?  Tasks?  Universities?  Students? What are their projects?  Leadership?  R&D needed? or proof-of-concept

O AK R IDGE N ATIONAL L ABORATORY U. S. D EPARTMENT OF E NERGY 11 What is it Going to Cost?  Initial cost - capitalization  Running cost - people, consumables, upgrades  Target change cost - an area for deferral to the future;-)

O AK R IDGE N ATIONAL L ABORATORY U. S. D EPARTMENT OF E NERGY 12 How Do We Sell It?  Mentioned in LRP but not as a major item  Linkage to CPU report of M. Turner  DNP will have session on ‘how to respond’ at Tucson  Linkage to ongoing RIA, SciDAC, NASA efforts  People needed  Student opportunities  Cost  “Advertising”

O AK R IDGE N ATIONAL L ABORATORY U. S. D EPARTMENT OF E NERGY 13 What is the Timeline from Today to Proposal to Construction?  Need ‘formal’ SNS approval (may have it)  Need White Paper on physics  Need Proposal  Need "friendly" DOE, NSF, DNP, LRP (next LRP in 2007 ;-( )  “For information only” presentation to DOE and NSF by early 2004  At least 2 years from proposal to funding