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+ | ====== The NSCL S800 spectrograph ====== | ||
+ | Welcome to the wiki page of the NSCL S800 spectrograph. The page provides technical information about the S800, as well as instructions to operate the S800 prior to and during an experiment. | ||
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+ | ===== Technical Aspects of the S800 ===== | ||
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+ | * [[Introduction]] | ||
+ | * [[Stations]] | ||
+ | * [[Magnets]] | ||
+ | * [[Modes of Operation]] | ||
+ | * [[Determination of Angles and Momentum]] | ||
+ | * [[Detectors]] | ||
+ | * [[Electronics]] | ||
+ | * [[Data Acquisition (DAQ)]] | ||
+ | * [[S800 Software]] | ||
+ | * Coupled Detectors/ | ||
+ | * Types of Experiments | ||
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+ | ===== Operation of the S800 ===== | ||
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+ | ==== Magnets ==== | ||
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+ | === Spectrograph Dipoles === | ||
+ | Each S800 dipole [3] weights 70 Tons and has a 15 cm gap. The bending radii and angle are 2.8 m and 75°, respectively. The magnet has five main pieces: two top slabs, the inner and outer side yokes, and the pole tip assembly. The maximum current supplied to the coil is 450 A, translating into a 1.6 T maximum central magnetic field, and a maximum magnetic rigidity of about 4 Tm. Trim coils are installed on the inner and outer radii of the dipoles to achieve a uniform field near the edges of the magnet. The operating current of the trim coils is 43.75% the value of the magnets. A liquid helium feed circuit brings liquid helium through a heat exchanger at the top of the magnet | ||
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+ | === Spectrograph Quadrupole Doublet === | ||
+ | In order to maximize the acceptance of the spectrograph, | ||
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+ | === Spectrograph Sextupole === | ||
+ | The only high-order magnet included in the S800 is a sextupole coil installed around the bore tube of Q2. The purpose of this element is to correct the broadening of the beam at the focal plane due to the dominant (x|2) aberration. This defines a narrower trajectory of the beam, allowing the use of a beam blocker at the focal plane to block the unreacted beam when its magnetic rigidity is close to the tuned setting. | ||
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- | **The S800 spectrograph** | ||
- | ====== Technical Aspects of the S800 ====== | ||
- | ===== Technical Introduction ===== | ||
- | ==== General ==== | ||
- | The S800 [1] is a superconducting spectrograph used for reaction studies with high-energy radioactive beams produced at the NSCL Coupled-Cyclotron Facility (CCF) and the A1900 Separator [2]. It was designed for high-precision measurements of scattering angles (ΔΘ=2) and momentum (p/ | ||
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