# Presentation: 193989

## Yuri Kamyshkov / University of Tennessee

- DUSEL Town Meeting and Workshop, Washington DC, November 2-4, 2007

## 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 

**Search for neutron ******** antineutron transitions at DUSEL**

*N-Nbar proto-collaboration*

*February 9, 2006, Lead, SD (LOI #7) *

- 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

## 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

## Following PAC recommendations we formed 

- a NNbar R&D 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.

## Collaboration plan includes:

- (a)  addressing feasibility issues (show stopper and cost)
- in 2-years R&D studies. R&D 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.
-  E&O 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

## construction feasibility

- conceptual design

- prelim
- design

- board
- approve

- construction

**2015**
**   ******

## Yates

- Ross

## Is shaft #5 available ?

-  #5; 5137

- Yates

- Ross

## calculated by Ken Ganezer

## Slide 10

## Slide 11

##   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

## Slide 13

## Slide 14