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Jan2010 Triumf1
- 1. UCN at TRIUMF 09:00-09:15 - Welcome 09:15-10:15 - UCN source overview, data, plans and progress on modifications. (Masuda et al) 1 Present UCN source at RCNP 1-1 Proton beamline, spallation target, neutron moderator, reflector and vertical He-II 1-2 UCN storage with valves 2 Next UCN source 2-1 Target moderator reflector geometry 2-2 Horizontal He-II 10:30-12:00 - UCN source implementation at TRIUMF and issues (short reports) - recap of discussion from yesterday afternoon (Martin) - experimental area design (UCN experimenters) - cryogenics design (Sekachev et al) - schedule (Verma et al) - costs (Martin) 13:30-14:10 - overview of experiments and data acquired (Matsuta et al) 14:10-14:30 - Xe comagnetometry (Masuda?) 3 EDM measurement 3-1 UCN polarization 3-2 Ramsey resonance 3-3 Buffer gas for GPE and Xe-comagnetometer 14:30-15:00 - prototyping for Xe? e.g. measurements of E-breakdown? 15:00-15:15 - prototyping for magnetic shielding? (both mu-metal and SC?) 15:30-16:00 - discussion of experimental LOI's/proposals (Martin) 16:00-16:30 - other experiments (discussion) (Martin)
- 2. Superthermal UCN source Increase n phase space density by phonon scattering ILL, KEK-RCNP/TRIUMF, LANL, PSI, Munich, SNS, NCSU, PNPI, Indiana UCN bottle UCN He-II or SD2 EUCN phonon form factor Ein S(Q,ω) cold n Φn
- 3. Superthermal UCN source Increase n phase space density by phonon scattering ILL, KEK-RCNP/TRIUMF, LANL, PSI, Munich, SNS, NCSU, PNPI, Indiana UCN bottle UCN He-II or SD2 Production rate PUCN = EUCN phonon ∫∫σ(Ein→EUCN)Φn(Ein)NdEindEUCN form factor d2σ/dQdω = Ein S(Q,ω) kf/ki σcoh/4π S(Q,ω) cold n Φn
- 4. Superthermal UCN source Increase n phase space density by phonon scattering ILL, KEK-RCNP/TRIUMF, LANL, PSI, Munich, SNS, NCSU, PNPI, Indiana UCN bottle ρUCN = PUCN×τs×εext×εd UCN He-II or SD2 Production rate PUCN = EUCN phonon ∫∫σ(Ein→EUCN)Φn(Ein)NdEindEUCN form factor d2σ/dQdω = Ein S(Q,ω) kf/ki σcoh/4π S(Q,ω) cold n Φn
- 6. 17.8 n/p Neutron 6.7 n/p production 4.4 n/p RCNP Nucleus 1.3 n/p n/p TRIUMF produced by n spallation 0.07 n/p MeV MeV MeV GeV 200 1 400 500 p beam Target 50 MeV nucleus K. Tesch Proton energy, Ep (MeV) (1985)
- 7. He-II World’s new UCN sources n guide solid angle 10-3~10-4 Cold n He-II SD2 source
- 8. He-II World’s new UCN sources n guide solid angle 10-3~10-4 Cold n He-II SD2 source ρUCN = PUCN×τs×εext×εd
- 9. He-II World’s new UCN sources n guide solid angle 10-3~10-4 Cold n He-II SD2 source ρUCN = PUCN×τs×εext×εd He-II Ours SD2 Los Alamos SD2 PSI PUCN (UCN/cm3/s) 2×103/20kW D2 4.4×104/76kW 2.9×105/1.2MW τs (s) 150 24×10-3 → 1.6 24×10-3 → 6 εd 12L → 30L 0.24L → 9.6L 27L → 2000L* εext 1 0.03* 0.1 Phys.Lett A301(2002)462 Phys.Lett B593(2004)55 Phys.Rev C71(2005)054601 PhysRevLett 89(2002)
- 10. UCN source improvement at RCNP ρUCN = production rate P × storage time τs, P∝ Φn , Φn ∝ Ep×Ip He-II film 3He, H Date Ip τs THe-II perimeter contamination 2002 200 nA 14 s 1.2 K 8.5 cm Normal 4He June 2006 1 μA 29 s 0.9 K 8.5 cm Normal 4He November 1 μA 34 s 0.8 K 5 cm Normal 4He 2006 July 2007 1 μA 39 s 0.8 K 5 cm Pure 4He Pure 4He April 2008 1 μA 47 s 0.8 K 5 cm fomblin December Pure 4He 1 μA 61 s 0.8 K 5 cm 2009 alkali
- 11. UCN source improvement at RCNP ρUCN = production rate P × storage time τs, P∝ Φn , Φn ∝ Ep×Ip He-II film 3He, H Date Ip τs THe-II perimeter contamination 3He cryostat 2002 200 nA 14 s 1.2 K 8.5 cm Normal 4He June 2006 1 μA 29 s 0.9 K 8.5 cm Normal 4He November 1 μA 34 s 0.8 K 5 cm Normal 4He 2006 July 2007 1 μA 39 s 0.8 K 5 cm Pure 4He Pure 4He April 2008 1 μA 47 s 0.8 K 5 cm fomblin December Pure 4He 1 μA 61 s 0.8 K 5 cm 2009 alkali
- 12. UCN source improvement at RCNP ρUCN = production rate P × storage time τs, P∝ Φn , Φn ∝ Ep×Ip He-II film 3He, H Date Ip τs THe-II perimeter contamination 2002 200 nA 14 s 1.2 K 8.5 cm Normal 4He Suppress June 2006 1He-II film flow μA 29 s 0.9 K 8.5 cm Normal 4He November 1 μA 34 s 0.8 K 5 cm Normal 4He 2006 July 2007 1 μA 39 s 0.8 K 5 cm Pure 4He Pure 4He April 2008 1 μA 47 s 0.8 K 5 cm fomblin December Pure 4He 1 μA 61 s 0.8 K 5 cm 2009 alkali
- 13. UCN source improvement at RCNP ρUCN = production rate P × storage time τs, P∝ Φn , Φn ∝ Ep×Ip He-II film 3He, H Date Ip τs THe-II perimeter contamination 2002 200 nA 14 s 1.2 K 8.5 cm Normal 4He June 2006 1 μA 29 s 0.9 K 8.5 cm Normal 4He Remove 3He November 1 μA 34 s 0.8 K 5 cm Normal 4He 2006 July 2007 1 μA 39 s 0.8 K 5 cm Pure 4He Pure 4He April 2008 1 μA 47 s 0.8 K 5 cm fomblin December Pure 4He 1 μA 61 s 0.8 K 5 cm 2009 alkali
- 14. UCN source improvement at RCNP ρUCN = production rate P × storage time τs, P∝ Φn , Φn ∝ Ep×Ip He-II film 3He, H Date Ip τs THe-II perimeter contamination 2002 200 nA 14 s 1.2 K 8.5 cm Normal 4He June 2006 1 μA 29 s 0.9 K 8.5 cm Normal 4He November 1 μA 34 s 0.8 K 5 cm Normal 4He 2006 July 2007 1 μA 39 s 0.8 K 5 cm Pure 4He Remove Hydrogen Pure 4He April 2008 1 μA 47 s 0.8 K 5 cm fomblin December Pure 4He 1 μA 61 s 0.8 K 5 cm 2009 alkali
- 15. UCN source improvement at RCNP ρUCN = production rate P × storage time τs, P∝ Φn , Φn ∝ Ep×Ip He-II film 3He, H Date Ip τs THe-II perimeter contamination 2002 200 nA 14 s 1.2 K 8.5 cm Normal 4He June 2006 1 μA 29 s 0.9 K 8.5 cm Normal 4He November 1 μA 34 s 0.8 K 5 cm Normal 4He 2006 July 2007 1 μA 39 s 0.8 K 5 cm Pure 4He Remove Hydrogen Pure 4He April 2008 1 μA 47 s 0.8 K 5 cm fomblin December Pure 4He 1 μA 61 s 0.8 K 5 cm 2009 alkali
- 16. EDM cell UCN UCN valve We are constructing a new He-II UCN source 1.2 m Present vertical source of 20 kW lead target Temperature 4. No gravitational barrier UCN Window phonon 3 mK EDM He-II cell UCN Cold 20~80 K UCN valve 3. Smaller UCN loss d Thermal 2. Short distance 300 K 1. Neutron production ×50 lead target n production several 1010 K
- 17. Conceptual design of the new UCN source 1. Neutron production ×50 2. Short distance distance between He-II and target 3. Smaller UCN loss 4. No gravitational barrier EDM He-II cryostat Permalloy 2 mG Ho Spherical coil Silica cell 100 mG Actuator GM cryostat pumping VF = 90 neV H1 UCN source 585 110 80 80 200 3He Door valve GM cryostat 70 Liq.He Silica guide Spin flipper 605 1K pot Level meter 114 40 Fe foil evacuation 72.4 5L pot 20K D22O 20K D O 85 72 Rotary .4 He-II 89 valve 89 UCN VF = 210 neV 300 valve UCN He- He 3 4 heat 300K D2O valve exchanger UCN detector Concrete Iron Graphite
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- 20. Construction of He-II cryostat will be in FY2010 Super leak for isotopically pure 4He production He-II cooling by means of 3He pumping UCN valve in He-II By evaporated 4He gas pre-cooling circulating 3He gas pre-cooling pure 4He gas cooling 77K radiation shield
- 21. Present Cu-fin heat exchanger for He-II cooling 3He side 4He side Heat exchange area will be increased for TRIUMF
- 22. Present UCN valve on He-II closed opened
- 23. 3He gas -4He gas Liq. He heat exchanger for the present source 3He gas 3He gas flow 4He gas
- 25. Present status Production Density Density Power rate source experiment 5 UCN/cm3/s 250 UCN/cm3 19 UCN/cm3 Ours 390 W 8L He-II 8L He-II Ec = 90 neV 210 neV 210 neV 4.4×104 UCN/cm3/s 145 UCN/cm3 35 UCN/cm3 Los Alamos 76 kW 0.24L SD2 3.6L, 200 neV Ec = 180 neV 335 neV 1 UCN/cm3/s Sussex-RAL 60 MW 1.3L He-II ** ** 250 neV Munich 100 kW ** 8 UCN/cm3 ** TRIGA reactor 10L, 250 neV Previous ILL 60 MW ** 50 UCN/cm3 2~3 UCN/cm3 335 neV Ec = 100 neV Serebrov (PNPI) also proposed a He-II UCN source in 2008