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B-field calculation for new TPC experiment and some calibration
Ryosuke Yamamura2007.12.22
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Calculation of magnetic field (using Radia) Drift line Calibration
Outline
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Radia
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Radia was magnetic calculation code built at the European Synchrotron Radiation Facility(ESRF)
using Boundary Integral Methods (TOSCA : using Finite Elementary Methods)
About Radia
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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 mihomore
Radia(compared with TOSCA)
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・ 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)
Calculation
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Solenoid cross section
z(mm)
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B-field(on z-axis)Bx(T)
z(mm)
By(T)
z(mm)
Bz(T)
z(mm)
Solenoid
Dipole
z=-1545.4mm
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Solenoid magnetic fieldMaster thesis Sawada-san(using TOSCA)
Using Radia(x=0,y=0)
z(mm)
Bz(T)
(x=150mm,y=0)Bz(T)
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LEPS Magnet 3D view from Radia
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Other pictures
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Drift-line・ using B-field map made by Radia(60A)
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Drift line(x-z plane)Test exp(solenoid-Dipole gap=400mm)
Next exp(Solenoid-Dipole gap=468.5mm)
Move solenoid magnet 68.5mm upstream
mm
mm mm
mm
TPC
loss Improve!
Shield
Drift plane
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Drift line(x-y plane) for pad9
Test exp(solenoid-Dipole gap=400mm)
Next exp(Solenoid-Dipole gap=468.5mm)
overlap
mm
mm mm
mmTPC
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Calibration(TPC test exp r11028)-still in progress
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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
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Rf-Tagger
Before slewing correction After slewing correction
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Rf-TaggerIt could solve 2ns bunch(rf) using rf-tagger
Tagger PL resolution ≅219ps
Gaussian Fitting