E1039 Polarized SeaQuest

Transcription

1 E1039 Polarized SeaQuest Dustin Keller University of Virginia Spin 2018

2 Outline Physics of Interest The Experimental Setup The Target System The Schedule

3 What we Think we Know Of the 4-5%, Higgs helps to understand 1% of this The mass generated by the Higgs mechanism is very far in value from the characteristic scale of strongly interacting matter Where is the rest of the Mass in hadrons Where is the rest of the Spin Valence quarks masses contribute only about 1% of the proton mass Valence quarks contribute 20-30% to the proton spin

4 Proton Spin Puzzle

5 Where is the missing spin?

6 Quark Transverse Momentum and Sivers TMD

7 Accessing Quark Sivers TMDs

8 Distortion in Transverse Space Side view Front view up quarks proton down The presence of spin can distort the distribution of quarks in transverse space (orbital angular momentum of quarks is required) A distortion in the distribution of quarks in transverse space can give rise to a nonzero Sivers function

9 Polarized Drell-Yan

10 SeaQuest Dimuons Open up dimuon trigger Beam collimation Improved DAQ Lessons from E906 SeaQuest E906 Preliminary

11 E1039 Tries to Answer Magnitude and Sign of sea vs. valance Sivers: SIDIS give valance region, but at small xb for sea quarks the uncertainty is too big Relation of the Sivers asymmetry measured in SIDIS to DY in the sea quark region

12 Other Physics

13 Other Physics Gluon Sivers in the valence region: J/ψ TSSA (color-octet/color-signlet): Large A Can be measured using J/ψ for small xf due to gluon-gluon fusion N from valance quarks, charm Open charm and anti-charm: Transversity: Sea quarks through the angular distributions of Single muon TSSA from charm decay, color interaction, Twist-3 framwork the polarized Drell-Yan production Dark Sector Drell-Yan like Physics: Dark photon and Dark Higgs

14 SeaQuest Dark Sector Physics Emerging as a picture of dark matter: Compatible with like dark matter, and allows self-scattering, collision excitation, and annihilation - Standard Model forces don't couple to the dark sector, dark forces don't couple to standard model matter Vector portal: dark mediator is a massive U(1) boson (heavy photon) - Kinetic mixing with the photon has weak coupling to electric charge

15 Dark Sector Physics Parameter space: mass ma' and coupling strength Є - Coupling strength governs production and decay to SM - Favored region is ma' MeV-GeV and Є < 10-6

16 Experimental Setup for E1039 Polarized SeaQuest

17 Experimental Setup for E1039 Detector Pack Target Cave: Under Construction Solid Iron Magnet (focusing magnet, hadron absorber and beam dump) Station 2 (Hodoscope array, drift chambers track)

18 Beam-line Setup New Beam Callimator Focusing Q3 magnet Target cell fitted to beam profile FNAL: Carol Johnstone

19 Fermilab NM4 Experimental Hall Counting House Area Target Cave Downstream Detector Area

20 Cave Setup inside NM4

21 Cryo-Platform Quantum Technology Corporation Helium Recovery, Purification and liquifier Compressor Stack Buffer Dewar Set Liquifier Controls

22 Target Cave From Downstream

23 Target Cave from Upstream

24 Cryo-platform Liquifier Setup Roots Pumps

25 Inside the Cave Liquifier: Target System: UVA G-Frame: Brace Piping, hold actuator, and pulley Quantum Technologies system - design: UVA and NMSU - build: NMSU, FNAL, UVA Actuator: Move target cell into position, keep EIO fixed - design: UVA and NMSU (Jlab) - build: NMSU, FNAL, UVA Load from target platform: Uses pulley system to lower insert into fridge, foam dewar - design: UVA, FNAL - build: NMSU, FNAL, UVA Target Pimping Pump setup: - design: UVA, LANL - Build: UVA, LANL, FNAL

26 Inside the Cave Liquifier: Target System: UVA G-Frame: Brace Piping, hold actuator, and pulley Quantum Technologies system - design: UVA and NMSU - build: NMSU, FNAL, UVA Actuator: Move target cell into position, keep EIO fixed - design: UVA and NMSU (Jlab) - build: NMSU, FNAL, UVA Load from target platform: Uses pulley system to lower insert into fridge, foam dewar - design: UVA, FNAL - build: NMSU, FNAL, UVA Target Pimping Pump setup: - design: UVA, LANL - Build: UVA, LANL, FNAL

27 Target System

28 The Polarized Drell-Yan Target High Intensity 3x1012 per 5s spill (Intensity Frontier) 8 cm long target cell NH3 and ND3 14,000 m3 /hour pumping 5T vertically pointing SC magnet Some of the challenges Minimize quenching with this intensity Polarized target cell uniformly and measurement Don't loose too much helium to run sustainable

29 Radiation Near Target Prompt: - Larger than 1X103 msv/hour for target cave - About 1X104 msv/hour in the magnet and downstream

30 DNP Target System LANL-UVA CPI-EIO NH3 ND3 Produced at UVA NIST irradiation 14 MeV to 1017 e- /cm2 UVA-LANL

31 P&ID

32 Oerlikon Pump Stack Roots 7,000 m3 /hr 7,000 m3 /hr 7,000 m3 /hr 14,000 m3 /hr Pumping capacity 755 m /hr Rotary Vane 3 Assembled and test FNAL now ready for installation

33 5T Superconducting Magnet Rotated For Transverse original design S. Penttila, Oxford Instrument LANL owned Magnet set for 20 years Feasibility Study Shipped to UVA 2013 Cooldown in June of that year Shipped to Oxford Instruments for rotation Back To UVA Third cooldown: good hom. Over 5T in 8cm Many cooldowns since Systems runs smooth and stable but consumes lots of liquid helium 500 L just to cool it after liquid nitrogen pre-cool 160 L per day with boil-off, sep, and fridge

34 Target Insert

35 Target Inserts 8 cm 3 or 4 target cells per insert 3 coils per target cell (1 apart) 9-12 NMR lines running out of cave

36 Target Insert

37 Microwave System 20W EIO attenuated down to 1W Have 2 dedicated for E1039

38 Microwave Control System

39 Simulations and Testing

40 NMR System Follows Liverpool design Q-meter as double wide VME 1 analog/1 digital board, crate controller 16 bit ADCs/DACs, with modern RF electronics USB/Ethernet interface Iterate through the 3 coils separately Cold NMR for ND3, standard for NH3

41 Evaporation Refrigerator Annealing Oven

42

43 Putting it all Together

44 Test Full System

45 Cryogenic Performance

46 Results of All the Work 95% Proton Polarization Next cooldown at UVA planed for Sept 17, then off to Fermilab

47 E1039 Schedule Installation of QT Liquifier complete at end of March Transportation to Fermilab: Oct 12 - First Fermilab Magnet Cooldown: Oct 25 - First complete Target Cooldown End of November First Beam - Before Liquifier: Feb Sustained running: April 2019

48 Join the Effort Send mail to: A Good time to join the collaboration, experiment receives Nuclear and HEP funding, so everyone in Spin physics is welcome and there is still lots of work to go

49 Thank You