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| + | 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 | ||
| + | * [[Introduction]] | ||
| + | * Analysis Line | ||
| + | * Spectrograph | ||
| + | * Stations | ||
| + | * Object | ||
| + | * Intermediate Plane | ||
| + | * Target | ||
| + | * Focal Plane | ||
| + | * Magnets | ||
| + | * Spectrograph Dipoles | ||
| + | * Spectrograph Quadrupole Doublet | ||
| + | * Spectrograph Sextupole | ||
| + | * Analysis Line Dipoles | ||
| + | * Analysis Line Quadrupoles | ||
| + | * Modes of Operation | ||
| + | * Focus Mode | ||
| + | * Dispersion Matching Mode | ||
| + | * Monochromatic Mode | ||
| + | * Determination of Angles and Momentum | ||
| + | * Ion Optics Coordinates | ||
| + | * Reconstruction Method | ||
| + | * Calculation of Inverse Maps | ||
| + | * Detectors | ||
| + | * Plastic Scintillators | ||
| + | * Tracking Parallel Plate Avalanche Counters (PPAC) | ||
| + | * Cathode Readout Drift Chambers (CRDC) | ||
| + | * Ionization Chamber | ||
| + | * Hodoscope | ||
| + | * Electronics | ||
| + | * General Description | ||
| + | * Time Stamping Scheme | ||
| + | * Busy Scheme | ||
| + | * Schematics | ||
| + | * Trigger Box | ||
| + | * Busy Circuit | ||
| + | * Gate Generation | ||
| + | * Inspect Channels | ||
| + | * Time Stamping | ||
| + | * Coupling of S800 with Other Detectors | ||
| + | * Software | ||
| + | * SpecTcl | ||
| + | * The TreeParameter Class | ||
| + | * Frequently Used Parameters | ||
| + | * Frequently Used Variables | ||
| + | * Data Acquisition | ||
| + | * Experiment detectors | ||
| + | * Coupled Detectors and Devices | ||
| - | ===== Technical Introduction ===== | ||
| ==== General ==== | ==== 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 msr) and momentum (p/ | + | 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 msr) and momentum (p/ |
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| The analysis line extends from the object position to the target station, with a total length of 22 m. It includes four 22.5° dipoles, five quadrupole triplets, and two vertically steering magnets, assembled in two segments with configurations QQQ-H-DD-QQQ (segment 6) and QQQ-DD-H-QQQ-QQQ (segment 7) symmetrically oriented around an intermediate image plane. The maximum rigidity is 5 Tm, although it depends on the tune of the quadrupoles. The acceptances of the analysis line depends on the optical mode. | The analysis line extends from the object position to the target station, with a total length of 22 m. It includes four 22.5° dipoles, five quadrupole triplets, and two vertically steering magnets, assembled in two segments with configurations QQQ-H-DD-QQQ (segment 6) and QQQ-DD-H-QQQ-QQQ (segment 7) symmetrically oriented around an intermediate image plane. The maximum rigidity is 5 Tm, although it depends on the tune of the quadrupoles. The acceptances of the analysis line depends on the optical mode. | ||
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| + | [[s800]] | ||
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| Some detection systems do not require a scattering chamber. In this case, the chamber will be removed and the target is slid into a pipe surrounded by the detector array. SeGA, CAESAR, GRETINA, PLUNGER, LENDA have standard frames and setups to be used with the S800. Other detector arrays would require the design and fabrication of new hardware. In this configuration a target change presently requires venting the target section and dismounting part of the hardware to access the inside of the beam pipe. This operation typically takes about 30-45 minutes. | Some detection systems do not require a scattering chamber. In this case, the chamber will be removed and the target is slid into a pipe surrounded by the detector array. SeGA, CAESAR, GRETINA, PLUNGER, LENDA have standard frames and setups to be used with the S800. Other detector arrays would require the design and fabrication of new hardware. In this configuration a target change presently requires venting the target section and dismounting part of the hardware to access the inside of the beam pipe. This operation typically takes about 30-45 minutes. | ||
| The S800 focal plane box (see (picture) Fig. xxx) is equipped with various detectors including two position sensitive Cathode Readout Drift Chambers (CRDCs) for tracking the trajectories of the particles, a ion chamber for the measurement of energy loss, a timing scintillator | The S800 focal plane box (see (picture) Fig. xxx) is equipped with various detectors including two position sensitive Cathode Readout Drift Chambers (CRDCs) for tracking the trajectories of the particles, a ion chamber for the measurement of energy loss, a timing scintillator | ||
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| === Spectrograph Sextupole === | === 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. | 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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start.txt · Last modified: 2024/01/02 12:45 by pereira
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