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Magnetic Field Calculation and Calibration for New TPC Experiment

This document outlines the calculation of the magnetic field for a new Time Projection Chamber (TPC) experiment using the Radia software, which is proficient in magnetic field simulations without the need for meshing the vacuum. Key details include drift line calibration, center positioning for solenoids and dipoles, and performance comparisons with TOSCA. The current settings (60A for solenoids) and adjustments to solenoid-dipole gaps are detailed. Additionally, the use of an RF-tagger for improved time resolution in experiments is discussed, addressing calibration challenges and drift line optimizations.

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Magnetic Field Calculation and Calibration for New TPC Experiment

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  1. B-field calculation for new TPC experiment and some calibration Ryosuke Yamamura 2007.12.22

  2. Outline • Calculation of magnetic field (using Radia) • Drift line • Calibration

  3. Radia

  4. About Radia • Radia was magnetic calculation code built at the European Synchrotron Radiation Facility(ESRF) • using Boundary Integral Methods (TOSCA : using Finite Elementary Methods)

  5. Radia(compared with TOSCA) • The advantages ・free software ・does not need to mesh the vacuum ・could calculate full-geometry (It is hard using TOSCA) • The disadvantages ・could not use on miho more

  6. Calculation ・z-position • Solenoid center=-1545.4mm(test exp) =-1613.9mm(next exp) • Dipole center=0mm ・Gap(Dipole-solenoid) 400mm(test exp) 468.5mm(next exp) Solenoid current = 60A,45A (45A: for test exp)

  7. Solenoid cross section z(mm)

  8. B-field(on z-axis) Dipole Bx(T) By(T) z(mm) z(mm) Solenoid Bz(T) z(mm) z=-1545.4mm

  9. Solenoid magnetic field Using Radia(x=0,y=0) Bz(T) Master thesis Sawada-san (using TOSCA) z(mm) (x=150mm,y=0) Bz(T)

  10. LEPS Magnet 3D view from Radia

  11. Other pictures

  12. Drift-line ・using B-field map made by Radia(60A)

  13. Drift line(x-z plane) Move solenoid magnet 68.5mm upstream Test exp (solenoid-Dipole gap=400mm) Next exp (Solenoid-Dipole gap=468.5mm) mm mm TPC Drift plane Shield mm mm Improve! loss

  14. Drift line(x-y plane) for pad9 Test exp (solenoid-Dipole gap=400mm) Next exp (Solenoid-Dipole gap=468.5mm) mm mm overlap TPC mm mm

  15. Calibration(TPC test expr11028)-still in progress

  16. Rf-inner ・It couldn’t solve the 2ns bunch(rf) using inner scintillator ・inner scintillator’s time resolution was more than 700ps (from cosmic-ray test) →so use Rf-tagger

  17. Rf-Tagger Before slewing correction After slewing correction

  18. Rf-Tagger Tagger PL resolution It could solve 2ns bunch(rf) using rf-tagger ≅219ps Gaussian Fitting

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