Progress of the UCN facility and nedm experiment at TRIUMF
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1 Canada s national laboratory for particle and nuclear physics and accelerator-based science Progress of the UCN facility and nedm experiment at TRIUMF Florian Kuchler Postdoc UCN Oct 25 th 2017
2 2 F. Kuchler, INT, Seatle, 2017 TRIUMF
3 F. Kuchler, INT, Seatle, UCN@TRIUMF UCN experimental area UCN beamline (BL1U) \ Goal:Establish UCN user facility with two UCN ports and atract international scientific community.
4 4 F. Kuchler, INT, Seatle, 2017 Ultra Cold Neutrons Energy ~ 100 nev Velocity ~ 5 m/s Wavelength ~ 50 nm Interactions: Gravity 100 nev/m Magnetic field 60 nev/t Weak interaction β-decay n p + e, T ~ 880s 1/2 Strong interaction Fermi potential 335 nev ( 58 Ni) (atom distance : ~ 1 Å) UCN feel average nuclear potential UCN can be confined in material botle long observation times on order of T 1/2
5 5 F. Kuchler, INT, Seatle, 2017 UCN production at TRIUMF Combination of spalation neutron source and superfluid helium converter D2 O, ice D 2 O, LD 2 moderator (300K, 20K) phonon down-scatering in He-I Features of the source: Smal distance between spalation target and UCN production volume heat-load Long storage lifetime in superfluid helium: τ s ~ T -7 Storage time τ s He-I temperature 600 s 0.8 K 36 s 1.2 K
6 6 F. Kuchler, INT, Seatle, 2017 UCN beamline: Overview 520 MeV protons
7 7 F. Kuchler, INT, Seatle, 2017 UCN beamline: Kicker TRIUMF beam structure: 120 μa pulse for 1 ms no beam for μs Kicker ramps up during beam notch (200 A/50 μs) kicks every 3 rd pulse to BL1U (UCN) average of 40 μa for UCN curently limited to 1 μa (every 120 th pulse) Timing of target iradiations: Balance of UCN density accumulation and heat load Planning target iradiation time of 60 s
8 8 F. Kuchler, INT, Seatle, 2017 UCN beamline status First beam on target Nov 2016 New UCN beamline commissioned Kicker commissioned Operator training and handover
9 Masuda et. al., Phys. Rev. Let. 108, (2012) 9 F. Kuchler, INT, Seatle, 2017 Vertical UCN source Vertical UCN source developed at RCNP Cooling stages: 60L liquid helium bath 1 K pot 3 He pot and heat exchanger 2016 Oct Move to TRIUMF 2016 Nov-Jan Savety modifications 2017 Jan Apr Instalation Final T He-I = 0.8 K UCN lifetime: 81 sec UCN density: 9 UCN/cm 3
10 10 F. Kuchler, INT, Seatle, 2017 Vertical UCN source instalation
11 11 F. Kuchler, INT, Seatle, 2017 Vertical UCN source instalation timelapse
12 11 F. Kuchler, INT, Seatle, 2017 Vertical UCN source instalation timelapse
13 12 F. Kuchler, INT, Seatle, 2017 Vertical UCN source instalation Vertical UCN source Liquid helium filing system UCN guide route 3 He gas panel Controls/ DAQ
14 13 F. Kuchler, INT, Seatle, 2017 Vertical UCN source cooling test Ful cooling test in April 2017 Final temperature 0.92 K 8 L of liquid He-I condensated Shortage of liquid helium delayed condensation: TRIUMF helium liquefier plant now upgraded by liquid nitrogen Liquid helium supply of 50 L/hr
15 14 F. Kuchler, INT, Seatle, 2017 Preparation for UCN production 2016 Oct Move to TRIUMF 2016 Nov-Jan Savety modifications 2017 Jan Apr Instalation 2017 Apr-May Cooling test (T He-I = 0.9 K) 2017 Aug 3 He line blockage 2017 Nov UCN production Just restarted cooling process: - D 2 O moderator filing/cooling (1-2 weeks) - liquid helium filing (1 day) - 3 He circulation (1 day) - condensation of isopure helium (3 days) -> possible first UCN production: Nov 11th Expectation: 10 5 UCN for 60s iradiation, several UCN/cm 3 Factor 100 with newly developed phase-i source (2-3 years) 9 layers of D 2 O ice
16 15 F. Kuchler, INT, Seatle, 2017 New UCN source development Liquid D 2 moderator wil increase the cold neutron flux to He-I Safety issue: liquid D 2 volume order of 20 L max Optimizing the geometry by MC simulation 5 9 times larger cold neutron flux achievable vs. ice D 2 O
17 16 F. Kuchler, INT, Seatle, 2017 New UCN source development Confine He-I by gravity ~1m Heat transfer in superfluid helium only suficient for 1m distance Relaxed the target temperature of He-I to K Cooling method options Heat exchange with 3 He (primary) Direct pumping of He-I (alternative) Reduce He-I/vacuum volume ratio to ~25%
18 ΔT = 0.31 K F. Kuchler, INT, Seatle, New UCN source development Proton beam TRIUMF: 20 kw (RCNP 0.4kW) ~1m Expected heat load on superfluid production volume (20 L): up to 10 W (at 1 K) d=150 mm, L=1 m pumping speed 10,000 m 3 /hour Resulting temperature distribution He-I high: 1.06 K (τ up-scat = 87 sec) He-I low: 1.00 K Cu high: 0.84K Cu low: 0.83 K 3He: 0.75 K
19 18 F. Kuchler, INT, Seatle, 2017 TRIUMF neutron EDM - Overview Upgrade the UCN source and instal EDM apparatus (aiming to be ready in 2020) Proton curent 40 μa Sensitivity goal: ecm (100 days)
20 19 F. Kuchler, INT, Seatle, 2017 TRIUMF neutron EDM - Sensitivity Features/goals: UCN densitiy inside EDM cel >100 cm -3 Dual-comagnetometer inside EDM cel ( 199 Hg/ 129 Xe) EDM experiment inside magneticaly shielded room Simultanous spin detection
21 20 F. Kuchler, INT, Seatle, 2017 Summary Instalation of vertical UCN source cryostat in 2017 UCN beamline (and kicker) ready! First UCN production at TRIUMF hopefuly in 2017 Design of new UCN source ongoing (>10 7 UCN/s) Meanwhile also neutron EDM design/r&d Received CAD 15.7 milion infrastructure funds (CFI) Future UCN user facility
22 21 F. Kuchler, INT, Seatle, 2017 TUCAN colaboration TRIUMF Ultra Cold Advanced Neutron source KEK T. Adachi, S. Jeong, S. Kawasaki, Y. Makida, K. Mishima, T. Okamura, Y. Watanabe U Nagoya M. Kitaguchi, H. Shimizu RCNP Osaka K. Hatanaka, I. Tanihata, R. Matsumiya (also TRIUMF), E. Piere (also TRIUMF) UBC E. Altiere, D. Jones, K. Madison, E. Miler, T. Momose, T. Hayamizu U Wininipeg Ch. Bidinosti, B. Jamieson, R. Mammei (also TRIUMF), J. Martin U Manitoba T. Andalib, J. Birchal, M. Gericke, M. Lang, J. Mammei, S. Page, L. Rebenitsch, S. Hansen-Romu, S. Ahmed TRIUMF Ch. Davis, B. Franke, K. Katsika, T. Kikawa, A. Konaka (also Uvic and Osaka U.), F. Kuchler, L. Lee, R. Picker (also SFU), W. Ramsey, W. Van Oers (aslo U. Manitoba), T. Lindner (also UW) UNBC E. Korkmaz SFU J.Sonier
23 Canada s national laboratory for particle and nuclear physics and accelerator-based science Thank you! Merci! TRIUMF: Alberta British Columbia Calgary Carleton Guelph Manitoba McGill McMaster Montréal Northern British Columbia Queen s Regina Saint Mary s Simon Fraser Toronto Victoria Western Winnipeg York Follow us at TRIUMFLab
24 F. Kuchler, INT, Seatle, 2017 Superconducting polarizer was developed at RCNP and shipped to TRIUMF Produce 3.75T magnetic field at the center. 95% UCN polarization was achieved at RCNP
25 F. Kuchler, INT, Seatle, 2017
26 F. Kuchler, INT, Seatle, 2017 High rate counting (>1.3MHz) and UVT eficiency stability (0.05% / hour) lightguides are required Detection via neutron capture in 6 Li: 6 Li + n 3 H(2.73MeV) + (2.05MeV) α Detector was wel characterized by beam test at PSI UCN beamline Increase the UCN statistics by measuring both spin state simultaneously Increase visibility due to less depolarization while storing above analyzer foil
27 F. Kuchler, INT, Seatle, 2017
28 F. Kuchler, INT, Seatle, 2017
29 F. Kuchler, INT, Seatle, 2017 Phase-I EDM experiment EDM equipment shipped from Japan (magnetic shields, UCN handling,.) UCN produced at proton beam curent of 1 μa (license, heat input)
30 F. Kuchler, INT, Seatle, 2017
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