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introduction [2013/12/23 17:22]
pereira
introduction [2016/10/30 15:52] (current)
pereira
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 ====== Introduction ====== ====== Introduction ======
-The S800 ((D. Bazin, J.A. Caggiano, B.M. Sherrill, J. Yurkon, and A. Zeller, Nuclear Instruments and Methods in Physics Research B 204, 629 (2003) )) is a superconducting spectrograph used for reaction studies with high-energy radioactive beams produced at the [[http://​www.nscl.msu.edu|NSCL Coupled-Cyclotron Facility (CCF)]] and the [[http://www.nscl.msu.edu/​exp/​devices#​a1900|A1900 Separator]] ((D.J. Morrissey, B.M. Sherrill, M. Steiner, A. Stolz, and I. Wiedenhoever,​ Nuclear Instruments and Methods in Physics Research B 204, 90 (2003) )). It was designed for high-precision measurements of scattering angles (ΔΘ=2 msr) and momentum (p/​Δp=2×10<​sup>​4</​sup>​),​ and large momentum and solid-angle acceptances (ΔΩ=20 msr, Δp/p=6%). The S800 layout shown in the next figure depicts the two parts of the S800: the analysis line and the spectrograph. ​+The S800 ((D. Bazin, J.A. Caggiano, B.M. Sherrill, J. Yurkon, and A. Zeller, Nuclear Instruments and Methods in Physics Research B 204, 629 (2003) )) is a superconducting spectrograph used for reaction studies with high-energy radioactive beams produced at the [[http://​www.nscl.msu.edu|NSCL Coupled-Cyclotron Facility (CCF)]] and the [[http://groups.nscl.msu.edu/​a1900|A1900 Separator]] ((D.J. Morrissey, B.M. Sherrill, M. Steiner, A. Stolz, and I. Wiedenhoever,​ Nuclear Instruments and Methods in Physics Research B 204, 90 (2003) )). It was designed for high-precision measurements of scattering angles (ΔΘ=2 msr) and momentum (p/​Δp=2×10<​sup>​4</​sup>​),​ and large momentum and solid-angle acceptances (ΔΩ=20 msr, Δp/p=6%). The S800 layout shown in the next figure depicts the two parts of the S800: the analysis line and the spectrograph. ​
  
 {{:​wiki:​s800_layout.png|Layout of the S800}} {{:​wiki:​s800_layout.png|Layout of the S800}}
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 === Spectrograph === === Spectrograph ===
-The spectrograph consist of two [[Magnets#​Spectrograph Quadrupole Doublet|quadrupoles]],​ a [[Magnets#​Spectrograph Sextupole|sextupole]] and two big [[Magnets#​Spectrograph Dipoles|dipoles]] assembled in a QQ-S-DD configuration (segment 8) that spans vertically from the target station to the focal plane, with a total length of 18 m. The figures of merit of the spectrograph are summarized in the next table and figure below. Achieving the nominal angle and momentum resolution require the control of different conditions such as object size (less than 0.5 mm), target thickness, uncertainty of the incident angle on the target, intensity, and whether or not the incoming beam needs to be tracked. ​+The spectrograph consist of two [[Magnets#​Spectrograph Quadrupole Doublet|quadrupoles]],​ a [[Magnets#​Spectrograph Sextupole|sextupole]] and two big [[Magnets#​Spectrograph Dipoles|dipoles]] assembled in a QQ-S-DD configuration (segment 8) that spans vertically from the target station to the focal plane, with a total length of 18 m. The sequence of pictures below show the quadrupole doublet at the "​entrance"​ of the spectrograph (left); the side view of the spectrograph as seen from the south bottom level of the [[S3 vault]]; and the second dipole as seen from the top level. 
 + 
 +{{:​wiki:​target_station_box.jpg?​350|Spectrograph quadrupole doublet (yellow chamber) as seen from the bottom of the S3 vault.}} 
 +{{:​wiki:​S3-spectrograph.jpg?​350|Spectrograph as seen from the south bottom of the S3 vault. Note that only the second dipole can be seen.}} 
 +{{:​wiki:​dipole-d2.jpg?​350|Second dipole of the spectrograph as seen from the top of the S3 vault.}} 
 + 
 + 
 +The figures of merit of the spectrograph are summarized in the next table and figure below. Achieving the nominal angle and momentum resolution require the control of different conditions such as object size (less than 0.5 mm), target thickness, uncertainty of the incident angle on the target, intensity, and whether or not the incoming beam needs to be tracked. ​
  
  
introduction.1387837360.txt.gz · Last modified: 2013/12/23 17:22 by pereira