A1260020709OClen

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DUSEL Town Meeting and Workshop, Washington DC,
November 2-4, 2007
NNbar RD plans, cost and schedule
Yuri Kamyshkov / University of Tennessee
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February 9, 2006, Lead, SD (LOI 7)
Search for neutron ? antineutron transitions at
DUSEL
N-Nbar proto-collaboration
Goal is to build at DUSEL a vertical 1-km long
experiment with zero background that would be
factor of 1000 more sensitive than previous
expt. at ILL/Grenoble
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Recommendations of Homestake PAC in 2006 (LOI
7)

• NNbar can be in the first suit of DUSEL
  experiments to be initialized ? 2011
• There are no previous NNbar-like experience and
  tradition in US
• It needs feasibility demonstrations and several
  developments in the Early
• Implementation Program to prepare a mature
  proposal
• We think these developments will be continued
  S4 MREFC process

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Following PAC recommendations we formed a NNbar
RD Collaboration to pursue studies towards the
full proposal and technical design CSUDH,
Indiana U., NCSU, ORNL, U. Tennessee and CNA
Engineering number of consulting experts

• The team has experience and expertise in
• large projects construction (L3 Hadron
  Calorimeter, KamLAND)
• participation in large underground experiments
  (UT, CSUDH)
• large scale underground construction (CNA
  Engineering MINOS,S1)
• reactor licensing, commissioning, operations
  (NCSU and ORNL)
• cold neutron sources and cold neutron
  experiments (IU, NCSU, UT)
• neutron technologies like supermirrors and mag.
  shield (IU, UT)
• neutron transport simulations (NCSU, ORNL, UT)
• intranuclear NNbar transition search (CSUDH)
• particle detector design, construction,
  simulations, cost estimate, etc.

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Collaboration plan includes (a) addressing
feasibility issues (show stopper and cost) in
2-years RD studies. RD proposal will be
submitted to NSF and DOE by Dec 3.

• Feasibility studies will include critical items
  where demonstrations are required
• construction issues of the km-long large
  diameter vacuum tube with focusing reflector and
  magnetic shielding inside vertical shaft
• reactor issues configuration, performance,
  licensing, ownership, safety, security, possible
  backgrounds for DUSEL etc.
• technological issues large-area supermirror
  focusing reflector construction, large-volume
  Earth magnetic field shielding down to nT-level
• preliminary pre-conceptual system design, cost
  estimate, and schedule
• measurement of straightness of candidate shaft
  and 3D mag. field components along the shaft
  length, survey of existing vertical shafts at
  Homestake.
• EO for NNbar and reactor at DUSEL.

(b) after the feasibility demonstration continue
work towards full proposal and technical design
within MREFC development of the DUSEL scientific
program
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Preliminary Project Development Plan
construction feasibility
2015 ?
conceptual design
prelim design
board approve
construction
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Yates
Ross
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Is shaft 5 available ?
5 5137?
Yates
Ross
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calculated by Ken Ganezer
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• All technologies used by proposed NNbar
  experiment exist. Challenge is
• in the engineering implementation in the
  large-size system
• Engineering support from DUSEL is not yet
  available
• (like e.g. for FNAL-based experiments from
  FNAL)
• We are trying to team with the major National
  Lab (LBL) for engineering
• Will need help from DUSEL and SDSTA in
• survey of vertical shafts
• understanding of availability constraints
• measurements of shaft parameters
• understanding of infrastructure
  connections
• definition of access
• tuning of development plans
• connection to SD administration and
  community for reactor issues
• our outreach efforts in SD

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