hall c shms fringe field analysis michael moore hall c winter meeting 2-22-2014
TRANSCRIPT
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Hall C SHMS Fringe Field AnalysisMichael Moore
Hall C Winter Meeting 2-22-2014
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Outline
• The Fringe Field Problem• TOSCA model• Results of simulations• Conclusions• Work that still needs to be done
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SHMS Elements
Q3 Q2 Q1 HBTarget
Dipole
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How Close is too Close?
HB Yoke
Cryostat(coils inside)
Beamline
HMS Q1
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The Model
MSU’s 1006 Fe 1006 Fe 1010
HB Q1
Q2Q3
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Displacements
Beam Dump Window4” diameter
x
𝑥=(𝑟 −𝐷𝑥)cos (𝛼)cos (𝛾−𝛼)
3𝑜
𝜃
𝛼
𝛾
z
x 𝐷𝑥𝑟
𝐷
Target (9.21,-175.76)
49 m, target to dump distance
*Not drawn to scale
∎3𝑜 𝑖𝑠𝐻𝐵𝑏𝑒𝑛𝑑𝑖𝑛𝑔𝑎𝑛𝑔𝑙𝑒
Beamline axis
Displacement from center of beamdump window
∎𝜃 𝑖𝑠𝑆𝐻𝑀𝑆𝑠𝑐𝑎𝑡𝑡𝑒𝑟𝑖𝑛𝑔𝑎𝑛𝑔𝑙𝑒∎𝛾=𝜃+3
Beam Trajectory
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“As Built” Fringe Fields
HB Q1 Q2 Q3
Integral: -126664Maximum: 1825.34Minimum: -2796.38
By Along Beampipe “As Built”, 11 GeV
By (G
)
Z (cm)
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Wedges Fringe Fields
By (G
)
Z (cm)
By Along Beampipe “Extra Fe”, 11 GeV
HB Q1 Q2 Q3
Integral: -72477.1Maximum: 1427.82Minimum: -1814.02
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“As Built” and Wedges Displacements
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60 cm Pipe
HB
Pipe
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Two meter Pipe
HB
Pipe
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Two meter Pipe with Q2 Collar
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Conclusions
• Run pipe and Q2 collar at more angles and energies• Optimize for smallest pipe length• Add HMS (at least Q1) to the model
Still to do
• As built, the SHMS is a >10 degree spectrometer• With extra Iron on the yoke it is a > 9 degree spectrometer• Iron pipe with wedges shows promise as a solution
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Fitting the Beam in the Beamdump Window