Development of Closed Orbit Diagnostics toward EDM Measurements at COSY in Jülich

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collaboration DPG Frühjahrstagung Darmstadt 1 Institut für Kernphysik

1 Development of Closed Orbit Diagnostics toward EDM Measurements at COSY in Jülich March 17, 2016 Fabian Hinder 1, 2 for the JEDI collaboration DPG Frühjahrstagung Darmstadt 1 Institut für Kernphysik IV, Forschungszentrum Jülich 2 III. Physikalisches Institut B, RWTH Aachen University

2 Baryogenesis Big Bang Symmetry between matter & antimatter Antimatter Matter Early Universe Three Sakharov conditions: 1. Baryon number violating interactions 2. Non thermal equilibrium 3. Violation of C, CP symmetry Antimatter Matter via: Strong CP violation (SM) Electroweak CP violation (SM) Beyond SM physics Today Measurement (WMAP 2003) Standard Model Expectation (η B η B ) η γ 6.14 ± Matter 3/17/2016 Fabian Hinder (f.hinder@fz-juelich.de) 2

3 Electric Dipole Moments (EDMs) as CP Violating Source H = μ B d E P: H = μ B + d E T: H = μ B + d E Permanent EDMs of light hadrons are T-violating CPT theorem CP violation A. Knecht, 2008, Wikimedia e μ = g 2m s e d = η 2mc s Search for new CP violation by measuring EDMs of charged particles in storage rings SM: d ecm 3/17/2016 Fabian Hinder (f.hinder@fz-juelich.de) 3

4 Measure EDMs in Storage Rings (Frozen Spin Method) All EDM experiments: Particle in trap Interaction of field E and EDM d Spin rotates Charged particles: Lorentz force Accelerator as trap for charged particles ds dt d E p 3/17/2016 Fabian Hinder (f.hinder@fz-juelich.de) 4

5 Spin Motion in Storage Rings Thomas-BMT-Equation: ds dt = S Ω MDM + S Ω EDM Ω MDM = q mγ γgb + G 1 γ 2 1 β E c μ = 2 G + 1 q 2m S Ω EDM = qη 2m E c + β B d = qη 2mc S G Proton Deuteron /17/2016 Fabian Hinder (f.hinder@fz-juelich.de) 5

6 Spin Motion in Storage Rings (Pure Electric Ring) Thomas-BMT-Equation: ds dt = S Ω MDM + S Ω EDM Ω MDM = q mγ γgb + G 1 γ 2 1 Ω EDM = qη 2m E c + β B β E c Pure electric ring: Freeze spin Ω MDM = 0 Only possible for Protons (G>0) G Proton Deuteron /17/2016 Fabian Hinder (f.hinder@fz-juelich.de) 6

7 Spin Motion in Storage Rings (Combined Ring E & B) Thomas-BMT-Equation: ds dt = S Ω MDM + S Ω EDM Ω MDM = q mγ γgb + G 1 γ 2 1 Ω EDM = qη 2m E c + β B β E c Pure electric ring: Freeze spin Ω MDM = 0 Only possible for Protons (G>0) Combined ring (E & B): Frozen spin possible for Protons and Deuterons G Proton Deuteron /17/2016 Fabian Hinder (f.hinder@fz-juelich.de) 7

8 Spin Motion in Storage Rings (Pure Magnetic Ring) Thomas-BMT-Equation: ds dt = S Ω MDM + S Ω EDM Ω MDM = q mγ γgb + G 1 γ 2 1 Ω EDM = qη 2m E c + β B β E c Pure electric ring: Freeze spin Ω MDM = 0 Only possible for Protons (G>0) Combined ring (E & B): Frozen spin possible for Protons and Deuterons Pure magnetic ring: Frozen spin not possible (ν s = γg) G Proton Deuteron /17/2016 Fabian Hinder (f.hinder@fz-juelich.de) 8

9 Spin Motion in Storage Rings (Pure Magnetic Ring) Thomas-BMT-Equation: ds dt = S Ω MDM + S Ω EDM Ω MDM = q mγ γgb + G 1 γ 2 1 Ω EDM = qη 2m E c + β B β E c Pure electric ring: Freeze spin Ω MDM = 0 Only possible for Protons (G>0) Combined ring (E & B): Frozen spin possible for Protons and Deuterons Pure magnetic ring: Frozen spin not possible (ν s = γg) New method proposed to measure EDMs at COSY Jülich 3/17/2016 Fabian Hinder (f.hinder@fz-juelich.de) 9

Cooler Synchrotron COSY in Jülich RF solenoid RF E

Deuterons RF Wien filter to generate EDM related

10 Cooler Synchrotron COSY in Jülich RF solenoid RF E B dipole Momentum up to 3.5 GeV/c Cooled beams (stochastic- & e-cooling) EDDA polarimeter Circumference 184 m Polarized Protons / Deuterons RF Wien filter to generate EDM related signal (installation in 2016) 3/17/2016 Fabian Hinder (f.hinder@fz-juelich.de) 10

11 Resonant Wien Filter Method* (Idea of First Direct Deuteron EDM Measurement) EDMs introduce vertical component of an horizontal polarized beam RF device used to accumulate this signal Device in Wien filter configuration to cancel beam perturbation Measure vertical polarization build-up S y per particle turn n in t meas 1000s Ω MDM = q mγ γgb Ω EDM = qη 2m β B EDM Signal 66ms *W. M. Morse, Y. F. Orlov and Y. K. Semertzidis, Phys. Rev. ST Accel. Beams 16, (2013) Courtesy: Marcel Rosenthal (m.rosenthal@fz-juelich.de) 3/17/2016 Fabian Hinder (f.hinder@fz-juelich.de) 11

12 Systematic Effects I Misaligned magnets lead to polarization build up orbit distortion Quadropole shifts σ < 1 mm & no EDM Correct orbit to minimize polarization build up Courtesy: Marcel Rosenthal (m.rosenthal@fz-juelich.de) 3/17/2016 Fabian Hinder (f.hinder@fz-juelich.de) 12

13 Systematic Effects II Quadropole shifts σ < 1 mm Courtesy: Marcel Rosenthal (m.rosenthal@fz-juelich.de) 3/17/2016 Fabian Hinder (f.hinder@fz-juelich.de) 13

14 Rogowski BPM for RF Wien Filter Installation of RF Wien Filter between quadrupoles Installation of Rogowski Coil BPMs at both ends Position beam in centre and parallel to Wien Filter E- and B- Field region 3/17/2016 Fabian Hinder 14

15 Rogowski Coil Pickup-Coil to measure the magnetic flux: Torus with: Major radius R = 40 mm Minor radius a = 5 mm Winding with copper wire N = 350 for each segment Divided into Four segments (BPM in horizontal and vertical plane) a R 15. 3/17/2016 März 2016 Fabian Hinder (f.hinder@fz-juelich.de) 15

16 Position Calculation Induced Voltage: U i I Horizontal: 4 1 x = π R2 a 2 2 (U 1 +U 2 ) (U 3 + U 4 ) ΣU i 3 2 Vertical: 4 1 y = π R2 a 2 2 (U 1 +U 4 ) (U 2 + U 3 ) ΣU i 3 2 3/17/2016 Fabian Hinder (f.hinder@fz-juelich.de) 16

17 Measurement Setup Preamplifier 4 1 Preamplifier Preamplifier 3 2 Preamplifier COSY RF Data Acquisition (PC) 3/17/2016 Fabian Hinder (f.hinder@fz-juelich.de) 17

18 Displacement [mm] Horizontal corrector strength Orbit Bump & Rogowski BPM Δx Fill Horizontal Bump 1 End Horizontal Bump 1 Time g2(t) = p0 t + p2 Δx = p 2 p 1 Δx = ± mm g1(t) = p0 t + p1 3/17/2016 Fabian Hinder (f.hinder@fz-juelich.de) 18

19 Δx [mm] Rogowski BPMs Linearity Corrector strength [% I max ] Linear over 4 mm No jumps within this range Calibration in Lab Installation in new RF Wien filter 3/17/2016 Fabian Hinder (f.hinder@fz-juelich.de) 19

Orbit Correction Beam position at the BPMs Orbit Response Matrix Corrector magnet strength Δ x y θ x θ y = M ORM = M ORM 1 θ x θ y x y uncorrected M ORM = M xx 0 0 M yy

20 Orbit Correction Beam position at the BPMs Orbit Response Matrix Corrector magnet strength Δ x y θ x θ y = M ORM = M ORM 1 θ x θ y x y uncorrected M ORM = M xx 0 0 M yy Determining the Orbit Response Matrix Two methods: 1. Calculate ORM from optics β, φ, ν, D and η 2. Measure ORM model independent 3/17/2016 Fabian Hinder (f.hinder@fz-juelich.de) 20

21 Displacement [mm] ORM Measurement (Model independent) x y = M ORM θ x 1. Change corrector magnet 2. Measure beam position at all BPMs θ y 3. Repeat 1 and 2 4. Fit linear function for each BPM corrector combination Corrector change [% I max ] 3/17/2016 Fabian Hinder (f.hinder@fz-juelich.de) 21

Storage Trigger New Automated ORM Measurement Corrector Magnet steerer steerer steerer Set Variations Measured Data BPM BPM BPM BPM Automatic ORM

22 Storage Trigger New Automated ORM Measurement Corrector Magnet steerer steerer steerer Set Variations Measured Data BPM BPM BPM BPM Automatic ORM Measurement Database Corrector Strength Deflection Angle Corrector Current COSY Timing System Measured Orbit Data 3/17/2016 Fabian Hinder 22

23 horizontal BPMs vertical BPMs M ij [mm / % I max ] Results I horizontal corrector magnets vertical corrector magnets 3/17/2016 Fabian Hinder (f.hinder@fz-juelich.de) 23

24 Displacement [mm] Results II Corrector magnet change [% I max ] Good example of BPM response 3/17/2016 Fabian Hinder (f.hinder@fz-juelich.de) 24

25 Displacement [mm] Results III Offset in BPM electronics influences ORM measurement Corrector magnet change [% I max ] 3/17/2016 Fabian Hinder (f.hinder@fz-juelich.de) 25

26 RMS x [mm] Orbit Correction x y = M ORM θ x θ y Δ θ x θ y = M ORM 1 x y uncorrected Predicted RMS values Measured RMS values 3/17/2016 Fabian Hinder (f.hinder@fz-juelich.de) 26

Specially: RF Wien Filter method Orbit control necessary

27 RMS x [mm] Summary Matter Antimatter Asymmetry New Rogowski BPM EDM as CP source EDM measurement at accelerators Specially: RF Wien Filter method Orbit control necessary Orbit correction 3/17/2016 Fabian Hinder (f.hinder@fz-juelich.de) 27

28 Outlook Installation of RF Wien Filter end 2016 In parallel development of orbit control, spin simulations and upgrade of BPM system Perform first direct EDM measurement for deuterons 3/17/2016 Fabian Hinder 28

29 Outlook Installation of RF Wien Filter end 2016 In parallel development of orbit control, spin simulations and upgrade of BPM system Perform first direct EDM measurement for deuterons 3/17/2016 Fabian Hinder 29

Development of a Rogowski coil Beam Position Monitor for Electric Dipole Moment measurements at storage rings

Development of a Rogowski coil Beam Position Monitor for Electric Dipole Moment measurements at storage rings PHD defense talk Physics Institute III B Nuclear Physics Institute (IKP-II) Fabian Trinkel