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Advanced Electron Scattering System Design at S-DALINAC

This project aims to design an advanced electron scattering system at S-DALINAC for studying nuclear physics using eA collisions. The motivation stems from the feasibility of electron scattering at very forward angles, with preliminary designs and simulations conducted using OPERA-2d. Key components include a 180° system, coincidence detectors, and specialized spectrometers. The system's parameters and design layout are crucial for achieving high-resolution measurements of electron trajectories and excitation energy spectra. Calculations of dipole and quadrupole field distributions guide the system's configuration, while ongoing simulations assess the system's mechanical dimensions, ion-optical properties, and beam transport characteristics. This project is part of the SFB 634 - A2 collaboration on nuclear structure physics with virtual photons.

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Advanced Electron Scattering System Design at S-DALINAC

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  1. Small Angle Magnet Yaroslav Kalmykov Institut für Kernphysik Technische Universität Darmstadt • Motivation • 180° System at the S-DALINAC • Requirements • Preliminary design • OPERA-2d simulations • Status SFB 634 – A2: Kernstruktur Physik mit virtuellen Photonen

  2. Motivation The eA Collider SFB 634 – A2: Kernstruktur Physik mit virtuellen Photonen

  3. Motivation S. Strauch et al., PRL 85 (2000) 2913 • Feasibility of electron scattering at very forward angles can be tested at the S-DALINAC SFB 634 – A2: Kernstruktur Physik mit virtuellen Photonen

  4. Motivation • E - Selectivity? • Coincidence detectors • - 2π Liquid scintillator • - Si-Ball • - BaF SFB 634 – A2: Kernstruktur Physik mit virtuellen Photonen

  5. Why at the S-DALINAC? • S-DALINAC • 22≤ E0≤ 120 MeV for (e,e’) • I ≤ 5 mAfor (e,e’) • QCLAM spectrometer • DW = 35 msr • Dp/p = ± 10% • DE/E = 2 x 10-4 (intrinsic) • 180° System • DW = 6.4 msr • -6% ≤ Dp/p ≤ 8% • DE/E = 2 x 10-4 (intrinsic) SFB 634 – A2: Kernstruktur Physik mit virtuellen Photonen

  6. 180° System at the S-DALINAC SFB 634 – A2: Kernstruktur Physik mit virtuellen Photonen

  7. Electron Trajectories in the 180° Mode • Coupling of “horizontal” and “vertical” optics SFB 634 – A2: Kernstruktur Physik mit virtuellen Photonen

  8. Background Sources in the 180° Mode • Time of flight measurement SFB 634 – A2: Kernstruktur Physik mit virtuellen Photonen

  9. Excitation Energy Spectrum of 12C SFB 634 – A2: Kernstruktur Physik mit virtuellen Photonen

  10. Requirements  • Bending magnet • Scattering at very forward angles • Incident beam energy : ≤ 80 MeV • Momentum transfer : ≈ 0 • Br • q • Spectrometer angle : ≥ 25° • Scattering chamber : Ø 582 mm • Target position • Quadrupole magnet • Beam broadening • Vacuum SFB 634 – A2: Kernstruktur Physik mit virtuellen Photonen

  11. Preliminary Design: Layout • Dipole and quadrupole components SFB 634 – A2: Kernstruktur Physik mit virtuellen Photonen

  12. Preliminary Design: Layout SFB 634 – A2: Kernstruktur Physik mit virtuellen Photonen

  13. Calculations: Dipole Field Distribution SFB 634 – A2: Kernstruktur Physik mit virtuellen Photonen

  14. Calculations: Dipole Field Distribution By (T) X (m) SFB 634 – A2: Kernstruktur Physik mit virtuellen Photonen

  15. Calculations: Quadrupole Field Distribution B (T) F (deg) SFB 634 – A2: Kernstruktur Physik mit virtuellen Photonen

  16. Status • General layout • - Mechanical dimensions and position • OPERA-2d simulations • - Two-dimensional field distribution • - Feasibility • OPERA-3d simulations • - Three-dimensional field distribution • Ion-optical properties (SAM + QCLAM) • - Momentum acceptance? • - Energy resolution? • - Solid angle acceptance? • - Scattering angle resolution? • Beam transport • - Focus? • - Background sources? SFB 634 – A2: Kernstruktur Physik mit virtuellen Photonen

  17. Preliminary Design: Parameters SFB 634 – A2: Kernstruktur Physik mit virtuellen Photonen

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