Prospects for a Storage Ring EDM-Facility at COSY

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Madeline Gallagher
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1 Mitglied der Helmholtz-Gemeinschaft Lepton Moments 2010 Prospects for a Storage Ring EDM-Facility at COSY July 2010 Hans Ströher

2 EDM at COSY Motivation Why another EDM search: - New approach: polarized charged particles - Potentially competitive sensitivity - Neutron and proton have to be measured -Deuteron: What else: - Technological challenges (new kinds of SRs) - Orthogonal to other big project w/i the Helmholtz-Association in Germany (FAIR) 20. September 2010 Institut für Kernphysik (IKP) Folie 2

3 EDM at COSY Outline Introduction (Jülich, IKP, COSY) Hadron Physics with spin at COSY EDM preparatory work at COSY Thoughts and first steps 20. September 2010 Institut für Kernphysik (IKP) Folie 3

4 The Helmholtz Association Overview 16 Helmholtz Centres (~ 30,000 staff, ~ 9,000 scientists) 20. September 2010 Institut für Kernphysik (IKP) Folie 4

5 Jülich Forschungszentrum FZJ IKP Between Cologne & Aachen ( > 4000 staff, > 1300 scientists) 20. September 2010 Institut für Kernphysik (IKP) Folie 5

6 Jülich Forschungszentrum FZJ Energy Environment Health Information Key Techn. SoM Annual budget: 415 M (2008) 20. September 2010 Institut für Kernphysik (IKP) Folie 6

7 Institute for Nuclear Physics IKP 120 staff, ~30 M annual budget 20. September 2010 Institut für Kernphysik (IKP) Folie 7

7 GeV/c Phase space cooled internal & extracted beams COSY

8 Cooler Synchrotron COSY Cooler and storage ring for (polarized) protons and deuterons p = GeV/c Phase space cooled internal & extracted beams COSY (early 90 s) Injector cyclotron (late 60 s) 20. September 2010 Institut für Kernphysik (IKP) Folie 8

9 COSY Experimental Facilities Hadron physics w/ hadronic probes 3 expt l set-ups: ANKE WASA TOF Spin Symmetries Spectroscopy WASA ANKE ~ 7000 hrs/yr TOF 20. September 2010 Institut für Kernphysik (IKP) Folie 9

10 COSY Recent Result Double polarized experiment (at ANKE): d p (pp) n Polarisation export cycle Measement supercycle Time within COSY-cycle (~ 8 min) Time within COSY-cycle (~ 60 min) Beam intensity (>10 9 ) previous cycle: unpolarized Acceleration E 1 E 2 E 1 (COSY-Supercycle) Polarized cycle Stacking Injection (~100x) (Electron cooling on) next cycle: polarized E 1 E 2 (COSY-Supercycle) 15 min 45 min Acceleration Stacking Injection (~100x) (Electron cooling on) During this time: Change of target-polarization (+,-) in 5s 20. September 2010 Institut für Kernphysik (IKP) Folie 10

11 COSY Recent Result Measurement during acceleration: pd 3 He η also possible during deceleration 20. September 2010 Institut für Kernphysik (IKP) Folie 11

12 COSY Spin Physics RF Solenoid RF Dipole EDDA ANKE-ABS SC, LSP Polarized Source LS-Polarimeter LE- Polarimeter HE- Polarimeter 20. September 2010 Institut für Kernphysik (IKP) Folie 12

COSY Recent Result Spin@COSY (A. Krisch et al.

# of flips Spin manipulations w/ very high

13 COSY Recent Result (A. Krisch et al.) Ferrite-core water-cooled rf-dipole (Michigan/FZJ) Polarization of 2.1 GeV/c stored protons vs. # of flips Spin manipulations w/ very high flip-probability (> 99.9%) 20. September 2010 Institut für Kernphysik (IKP) Folie 13

14 COSY Recent Result Schottky rf Solenoid Determination of Δp/p < 6 x 10-5 for beam momenta around 3 GeV/c (corresponds to orbit length uncertainty of 0.3 mm for 184 m COSY circumference) 20. September 2010 Institut für Kernphysik (IKP) Folie 14

15 COSY Prep s for HESR at FAIR Barrier Bucket Cavity (New) Stochastic Cooling (New) 2 M ev e-cooler (New) Rest Gas Profile Monitor (New) 20. September 2010 Institut für Kernphysik (IKP) Folie 15

16 COSY Polarized Antiprotons 2 methods: spin-flip and spin-filtering (COSY (p) & AD/CERN (p)) e-cooler low-ß section ABS, BRP ANKE PAX 20. September 2010 Institut für Kernphysik (IKP) Folie 16

17 COSY Recent Results Test of spin-flip (lepton hadron) to produce polarized antiprotons: COSY e-cooler ANKE Si tracker (1) Interaction of polarized p beam with e-target p COSY (2) Analysis of change of p beam polarization COSY experiment: depolarization of a polarized proton beam by unpolarized electrons (of detuned e-cooler) 20. September 2010 Institut für Kernphysik (IKP) Folie 17

18 COSY Recent Result Spin-flip (lepton hadron) Spin state E-cooler off on off on off on off on off on off on Polarimetry Target (detuned) e-cooler switched on/off every 5 seconds 20. September 2010 Institut für Kernphysik (IKP) Folie 18

19 COSY Recent Result σ < 10 7 b!! method of choice is spin-filtering (repeated interaction of stored beam with with polarized target) 20. September 2010 Institut für Kernphysik (IKP) Folie 19

20 COSY Intermediate Summary Mission of Helmholtz Association: - Perform research on big issues and big questions - Provide and operate the scientific infrastructures for national and international communities CPV ( Why do we exist? ) and a SR EDM facility clearly fall into this category! 20. September 2010 Institut für Kernphysik (IKP) Folie 20

21 COSY Intermediate Summary Mission of Helmholtz Association: - Perform research on big issues and big questions - Provide and operate the scientific infrastructures for national and international communities CPV ( Why do we exist? ) and a SR EDM facility clearly fall into this category! COSY at FZ-Jülich: mature and fexible - Excellent basis for a SR EDM facility - A must-do opportunity 20. September 2010 Institut für Kernphysik (IKP) Folie 21

22 EDM at COSY First Steps BNL-Review (Dec. 2009): 20. September 2010 Institut für Kernphysik (IKP) Folie 22

23 EDM at COSY First Steps Tests by dedm-collaboration at COSY (I): d + 12 C (Transparency by G. Onderwater (KVI, NL)) 20. September 2010 Institut für Kernphysik (IKP) Folie 23

24 EDM at COSY First Steps Polarimetry for protons: F. Rathmann (FZJ) has proposed to use a polarized hydrogen target and employ pp elastic scattering for polarimetry may provide smaller relative uncertainty than method proposed up to now (C-scattering) test of method at COSY (which we will do anyway PAX) 20. September 2010 Institut für Kernphysik (IKP) Folie 24

25 EDM at COSY First Steps Tests by dedm-collaboration at COSY (II): Proposal at recent COSY-PAC (3 weeks) - spin coherence time (SCT) studies - horizontal polarization - SCT optimization (Transparency after G. Onderwater (KVI, NL)) 20. September 2010 Institut für Kernphysik (IKP) Folie 25

26 EDM at COSY Thoughts Use COSY as it is for a proof-of-principle measurement!? e-cooler ABS, BRP, STT Snake low ß together w/ pedm-collaboration + (RWTH, ) 20. September 2010 Institut für Kernphysik (IKP) Folie 26

27 EDM at COSY Thoughts Advantageous if ONE ring for p,d, 3 He, and if it would fit into COSY-building: 20. September 2010 Institut für Kernphysik (IKP) Folie 27

28 EDM at COSY Formal Steps Have started formalities w/i Helmholtz : & Helmholtz Future Accelerators Project 20. September 2010 Institut für Kernphysik (IKP) Folie 28

29 EDM at COSY Formal Steps 20. September 2010 Institut für Kernphysik (IKP) Folie 29

Antiproton Polarization Studies for FAIR

Mitglied der Helmholtz-Gemeinschaft Antiproton Polarization Studies for FAIR How to produce polarized antiprotons (and what to use them for?) May 31, 2008 Hans Ströher Transversity 2008 (Ferrara, Italy)