The E166 Experiment: Undulator-Based Production of Polarized Positrons
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1 The E166 Experiment: Undulator-Based Production of Polarized Positrons Hermann Kolanoski (Humboldt-Universität Berlin) for the E166 Collaboration ILC: - physics with polarised e + e - - undulator source scheme for ILC E166 proof-of-principle of the undulator method - undulator basics - transmission polarimetry - Geant4 upgrade with (de)polarisation results & conclusions SPIN Oct. 6-11, 2008 Hermann Kolanoski - E166 Experiment 1
2 Physics with Polarised e + e - Polarized e + -beams in addition to polarized e - -beams offer*: Example: SUSY physics Separation of selectron pairs + e~ i R e~ + e e, L L, R Higher effective polarization Reduction of background Selective enhancement of processes Access to non-sm couplings New physics, e.g. extra dimensions. *G. A. Moortgat-Pick et al.: The Role of polarized positrons and electrons in revealing fundamental interactions at the linear collider. Phys. Rept. 460: , (e-print: hep-ph/ slac-pub-11087, CERN-PH-TH ) SPIN Oct. 6-11, 2008 Hermann Kolanoski - E166 Experiment 2
3 Undulator Source for ILC PRO: target 0.4 X 0 Ti-alloy lower e+ emittance less energy deposition in target and AMD e + e - production by 10 MeV photons polarisation transfer to e + less neutron activation polarized positrons CON: need high-energy electron drive beam (coupled e+/e- operation) long undulator ( m) SPIN Oct. 6-11, 2008 Hermann Kolanoski - E166 Experiment 3
4 Undulator Source Scheme for ILC auxiliary keep-alive source SPIN Oct. 6-11, 2008 Hermann Kolanoski - E166 Experiment 4
5 E166 proof-of-principle demonstration of the undulator method SPIN Oct. 6-11, 2008 Hermann Kolanoski - E166 Experiment 5
6 Undulator Basics E 1 2 2γ hc λ u K 23.7 MeV λ / mm u E e 50 GeV K = eb 0λ u 2π mc dn dl γ 4 πα K 3 λ u K λ / mm u 2 γ' s e m -1 E166 ILC(RDR) electron beam energy (GeV) field (T) period (mm) K value photon energy E 1 (MeV) beam aperture (mm) active length (m) no. of periods SPIN Oct. 6-11, 2008 Hermann Kolanoski - E166 Experiment 6
7 E166 Photon Spectrum Undulator Basics E166 Photon Polarization E 1 = 7.9 MeV 1st harmonic (dominating) expressions: Spectrum: Angular Distribution: Polarization: E166 Photon Yield: = no. of photons per beam electron SPIN Oct. 6-11, 2008 Hermann Kolanoski - E166 Experiment 7
![The E166 Experiment at SLAC FFTB Electron Gun 200 MeV Injector North Damping Ring [1.15 GeV] Linac South Damping Ring [1.](/docs-images/81/82822290/images/8-0.jpg "15 GeV] Positron Return Line 3 km Positron Source PEP II Low Energy Ring (LER) (3.")
8 The E166 Experiment at SLAC FFTB Electron Gun 200 MeV Injector North Damping Ring [1.15 GeV] Linac South Damping Ring [1.15 GeV] Positron Return Line 3 km Positron Source PEP II Low Energy Ring (LER) (3.1 Gev positrons) Beam Switch Yard (BSY) PEP II High Energy Ring (HER) (9 GeV electrons) End Station A (ESA) Final Focus Test Beam (FFTB) End Station B (ESB) PEP II IR-2 Detector SLD 2004/2005 setup and checkout weeks of data taking SPIN Oct. 6-11, 2008 Hermann Kolanoski - E166 Experiment 8
9 E166 experimental setup < 8 MeV 46.6 GeV POSITRON SPECTR. 4 8 MeV PHOTON ANALYZER POSITRON ANALYZER DM: electron beam dump magnets T1: γ e+ prod. target (0.2 X 0 W) T2: e+ γreconv. target (0.5 X 0 W) P1: e+ flux monitor (Silicon) CsI: CsI calorimeter SL: solenoid lens J: movable jaws C1 C4: photon collimation A1, A2: aerogel detectors S1, S2: silicon detectors GCAL: Si/W-calorimeter SPIN Oct. 6-11, 2008 Hermann Kolanoski - E166 Experiment 9
10 Undulator Operation Challenge: beam alignment shunt pulse current: 2.3 ka repetition rate 10 Hz current density 6.39 ka/mm 2 pulse duration: of about 12 μs. photon flux for different coolants kicks e - beam 23µrad ferrofluid oil SPIN Oct. 6-11, 2008 Hermann Kolanoski - E166 Experiment 10
11 E166 photo gallery SPIN Oct. 6-11, 2008 Hermann Kolanoski - E166 Experiment 11
12 Compton Transmission Polarimetry for Low-Energy Photons relies on spin dependence of Compton effect in magnetized iron: 3 cm Fe 15 cm Fe Compton Crosssection Transmission Asymmetry f (L Fe ) = A γ2 T Photon polarisation Analysing power SPIN Oct. 6-11, 2008 Hermann Kolanoski - E166 Experiment 12
13 (a) transfer e+ polarization to photons via brems/annihilation processes ( reconversions ) Positron Polarimetry (b) infer e+ polarization from photon polar. by transmission polarimetry (c) calculate analysing power from detailed simulation of spin dependent processes (new Geant4 implementations) SPIN Oct. 6-11, 2008 Hermann Kolanoski - E166 Experiment 13
14 Analyzer Magnets electron polarization of the iron: M = (B B 0 )/m 0 = magnetization n = electron density μ B = Bohr magneton g = magneto-mechanical factor active volume Photon Analyzer: 50 mm 150 mm long Positron Analyzer: 50 mm 75 mm long P e 0.07 ΔP e /P e < 0.05 (aim of experiment) SPIN Oct. 6-11, 2008 Hermann Kolanoski - E166 Experiment 14
15 Analyzer Magnet Installation e+ Analyzer γ Analyzer Pickup Coils CsI-Detector e+ Analyzer SPIN Oct. 6-11, 2008 Hermann Kolanoski - E166 Experiment 15
16 GEANT4 Upgrade for Polarisation Dependent EM Processes Gammas: GammaConversion ComptonScattering PhotoElectricEffect Diagnostics (Polarimetry): Cross sections polarization dependent Compton Scattering Bhabha Scattering MøllerScattering Positron annihilation in Flight... Electrons and Positrons: MultipleScattering Ionisation Bremsstrahlung MAGNETIC FIELD: Polarization transfer to e-/e+ Polarization tracking (depolarization effects?) polarized γ beam from the Helical Undulator SPIN Oct. 6-11, 2008 Hermann Kolanoski - E166 Experiment 16 e + e - e - e + e - e +
17 Photon Asymmetries transmission polarimetry γ s from undulator conclusion: measured photon asymmetries are in agreement with expectations based on the theor. undulator polarization spectrum and detector response functions. detector asymmetry δ(%) predicted δ(%) S2 (silicon) 3.88 ± 0.12 ± A2 (aerogel) 3.31 ± 0.06 ± GCAL (Si/W) 3.67 ± 0.07 ± no spectral shape analysis possible! SPIN Oct. 6-11, 2008 Hermann Kolanoski - E166 Experiment 17
18 Positron Analysis O(1%) asymmetry in CsI expected high statistics req d control systematics determine background for each signal: undulator on off change magnet polarity between cycles normalisation to P1 counter γ conversion γ e + data structure: super-run 10 cycles e + reconversion e + γ cycle + cycle - signal background events ( 3000/cy.) SPIN Oct. 6-11, 2008 Hermann Kolanoski - E166 Experiment 18
19 Energy Deposition in CsI crystals undulator on: signal + background undulator off: background good signal/background separation in central crystal use only central crystal for final results outer crystals as cross check and simulation scrutiny SPIN Oct. 6-11, 2008 Hermann Kolanoski - E166 Experiment 19
20 Analysis of positron asymmetries difficult tails truncated mean of each on-off combination within one cycle (with given magnet polarity) S CsI+ and S CsI- for each cycle pair 1 asymmetry point S CsI (i,j) distribution (all signal-backgr combinations) SPIN Oct. 6-11, 2008 Hermann Kolanoski - E166 Experiment 20
21 positron asymmetries central crystal asymmetries for e+ spectrometer setting at 140 A measured asymmetries per energy point 1%!! SPIN Oct. 6-11, 2008 Hermann Kolanoski - E166 Experiment 21
22 positron asymmetries Results & beam polarizations results for the central CsI crystal = analyzing power from simulations = electron polarization of the iron 85% SPIN Oct. 6-11, 2008 Hermann Kolanoski - E166 Experiment 22
23 Published in Physics Review Letters: An experiment (E166) at the Stanford Linear Accelerator Center (SLAC) has demonstrated a scheme in which a multi-gev electron beam passed through a helical undulator to generate multi- MeV, circularly polarized photons which were then converted in a thin target to produce positrons (and electrons) with longitudinal polarization above 80% at 6 MeV. The results are in agreement with Geant4 simulations that include the dominant polarization-dependent interactions of electrons, positrons and photons in matter. More detailed description of the experiment in a NIM paper under preparation SPIN Oct. 6-11, 2008 Hermann Kolanoski - E166 Experiment 23
24 Summary and Conclusions successful demonstration of the undulator method undulator functioned as predicted successful polarimetry of low-energy γ and e + confirmed expected γ e+ spin-transfer mechanism implementation of polarisation dependence in Geant4 measured high positron polarization 85% max. SPIN Oct. 6-11, 2008 Hermann Kolanoski - E166 Experiment 24
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