meeting March 8, 2011

Size: px

Start display at page:

Download "meeting March 8, 2011"

Edwin Snow
5 years ago
Views:

1 meeting March 8, 2011 Yuri Kamyshkov / University of Tennessee kamyshkov@utk.edu 1

2 Neutron antineutron t transformation ti experiment would be an alternative way of searching for baryon number violation with B=2 Strong physics motivation through theoretical models with direct connection to masses, 20, violation of (B L) symmetry, restoration of Left-Right symmetry, baryogenesis, dark matter, and possible new particles at LHC. See DUSEL Theory White Paper (2008) arxiv: v1 [hep-ph] at Last chapter is on NNbar. (2011) R. N. Mohapatra What can NNbar teach us about physics Beyond the Standard Model? (2011) K. Babu Observable Neutron-Antineutron Oscillations BLV-2011 Workshop, September in Gatlinburg, TN where this physics will be in the scope of discussion. 2

3 There is a possibility to extend the experimental sensitivity by 3-4 orders of magnitude in discovery of the new phenomenon Unique annihilation signature, no background one event = discovery If observed, possible to switch ON/OFF effect by external mag. field If observed: possible to study new physics e.g. CPT violation at scale > m P If not observed: will set new limits on the matter stability beyond PDK reach Tests some theoretical models Ideally need to watch transformation of neutron at rest. Since neutrons live ~ 900 sec many neutrons needed. Thermal neutrons : 2,200 m/s (Maxw.); cold neutrons : ~ 700 m/s; UCN : <7 m/s. Need powerful source on n with initial iti MeV energies moderated d down to cold and to UCN velocities. 3

4 Existing research reactors in US (NIST, ORNL) are not available to HEP. World research reactors (FMR-II, Grenoble, PIK, in China, etc.) are not available. With these high-flux reactors an experiment would be horizontal. Homestake mine has vertical shaft for Vertical NNbar. Small 3.5 MW research TRIGA reactor can be purchased from the shelves of General Atomics. Smaller n-flux here would be compensated by a vertical layout. But a reactor was not acceptable for DUSEL/SD due to its adverse effect on the environmental impact statement. Also, DOE/HEP has no experience with managing reactor experiments. Accelerator-based spallation target neutron source with vertical layout would be an experiment option of NNbar that falls into the scope of DOE/HEP intensity frontier research (same as DAEALUS). There is no strong reasons for experiment to be at Homestake site since other vertical shafts are in principle available. Required beam power can be compromised down ~ 200 kw CW operation if optimized UCN conversion can be used (R&D) together with vertical layout. New recent proposal for Neutron-Anti-Neutron-Oscillation (NANO) Experiment is now under development in India in collaboration with US. 4

5 P1 æa ö 2 = t ç çè ø 5

6 Neutron source: 34MW 3.4 annular core research TRIGA reactor with Liquid D 2 cold neutron moderator TRIGA = Training Research Isotopes from General Atomics Reactor schematic of B. Whittemore, GA Neutron elliptical focusing reflector 6

7 Basic accelerator parameters needed by DAEDALUS DALUS / NNbar OK MW MW DC operation n/a LESS Linacs might be too expensive: 1 GeV 1ma (~ SNS) ~ $700M DAEDALUS machine prototype might be good for NNbar 7

8 8

9 February 11 Meeting of NANO Collaboration in St. Louis, MO February 22 Meeting of Director of PRL J.N Goswami with council Chairman. Presentation ti of 10-page NANO proposal as part of PRL 5-years development plan (requested funding $80M) March Second meeting to respond to the funding request Expected that DAE can be also involved in NANO July 2011 Large NANO organizational meeting at Bangalore 9

Purchase / build commercial cyclotron + ion

Build prototype spallation target with UCN

10 Purchase / build commercial cyclotron + ion source with low energy and high current to serve as injector for next larger energy cyclotron. Build prototype spallation target with UCN conversion. Small NNbar with UCN storage. R&D on larger UCN spallation source. 10

11 Upgrade cyclotron to higher energy (~ 1 GeV) and power ( 0.2 MW) Increase UCN conversion yield. Larger NNbar expt. with UCN storage. R&D on ultimate t spallation target t / UCN converter for vertical expt. UCN production rates: At ILL reactor ucn/s is available now. In the best scenario of Albert Young (NCSU) with dedicated 1.9K SC He converter, 200 kw source ucn/s can be made available. In spallation target neutrons are produced in 4 but used for UCN conversion only in a small fraction of a solid angle (5-10%) UCN Converters: In thermal spectrum : tiny part Cryogen liquid moderators: (limit T n ~35K at ILL with Liq. D 2 ) : more UCN Solid CH 4 or CD 4 as cold moderators are not quite explored Solid D 2 converter! (limitations due to finite thermal conductivity) Super fluid He converter!!! Solid Oxygen (development at Indiana U)? Vertical NNbar experiment: 11

12 Schematic view of Spallation UCN target 200 kw -1 MW 12

13 Spallation UCN-Cold Source for NNbar experiment Sink hole Neutron elliptical focusing reflector 13

14 PHYSICAL RESEARCH LABORATORY Research in Physical Sciences Development of Infrastructure for Research Human Resource Development Science Popularization 14 URL:

15 Budget Estimate Utpal Sarkar INO: Initial estimate: $100 million Present estimate: $250 million NANO: $200millionwith TRIGA reactor? and vertical shaft at Mt Abu NANO: $100million with cyclotron and ultracold neutron, provided successful R&D Outcome: Internationalimportance importance, medicalapplications applications, accelerator technology for ADSR and neutron facility. 15

16 Present Proposal Utpal Sarkar Vertical Shaft at Mt. Abu, 1.2 km high Accelerator and Lab space at lower level l Detector near the observatory Phase I: accelerator facility + Lab + test facility $100 million Phase II: Actual expt $100 million 16

17 N Nbar sensitivity HFIR DUSEL NANO/UCN P, MW Layout horizontal vertical vertical Distance, m 300 1,000 1,000 N [n/s] t 2 [s 2 ] Nt In ILL units

18 Indian Accelerator Program Driven by Th ADSR 25% of world Th resources are in India 18

19 Collaboration between FNAL and India exist for the development of Project X ( India might contribute ~$250M to the Project X. Indian contact for Project X at FNAL is Shekar Mishra 19

It seems that India has recognized the possibility of cyclotron technology for ADSR Fermilab agreed to collaborate with India on LINAC direction (support for Project X) but no interest es was

In my opinion, this potential might be advantageous for DAEDALUS. Existing INO project (under PRL) seems to me being not much competitive with other world neutrino efforts.

20 It seems that India has recognized the possibility of cyclotron technology for ADSR Fermilab agreed to collaborate with India on LINAC direction (support for Project X) but no interest es was expressed essed for cyclotrons. o With obvious interest to ADSR India might be the country that can be potentially Interested to pursue and fund the cyclotron direction developments. In my opinion, this potential might be advantageous for DAEDALUS. Existing INO project (under PRL) seems to me being not much competitive with other world neutrino efforts. If high-power cyclotron technology can be developed in India then DAEDALUS idea probably can be implemented for INO (?) In R&D on high-current spallation targets interested potential partners might be: NNbar, DAEDALUS, ADSR (?India), SNS (2-nd target), Fermilab [I was told that 300 kw MINOS neutrino target is being replaced for 5-th time] 20

Neutron source: with Liquid D 2 cold neutron moderator. TRIGA = Training Research Isotopes from General Atomics. Neutron elliptical focusing reflector

Neutron source: with Liquid D 2 cold neutron moderator. TRIGA = Training Research Isotopes from General Atomics. Neutron elliptical focusing reflector Mini-Workshop, WU St. Louis, February 11, 2011 Yuri Kamyshkov/ University it of Tennessee email: kamyshkov@utk.edu Neutron source: 34MW 3.4 annular core research TRIGA reactor with Liquid D 2 cold neutron