User Tools

Site Tools


start

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision
Previous revision
Next revision Both sides next revision
start [2013/10/16 11:42]
pereira
start [2013/10/16 20:45]
pereira
Line 1: Line 1:
-====== Technical Aspects of the S800 ====== +====== The NSCL S800 spectrograph ====== 
-Welcome to the wiki page of the NSCL S800 spectrograph. The page is aimed at experiment users who are searching for technical information about the S800, as well as new device physicists who need to learn how to operate the S800 prior to and during an experiment.   The first once concerns technical details about the device physicists+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. 
  
-The second aspect provides a detailed description of the  
  
 +===== Technical Aspects of the S800 =====
  
-====== Technical Aspects of the S800 ====== +  * [[Introduction]] 
- +  * Stations 
-===== Technical Introduction ===== +  * Magnets 
- +  * Modes of Operation 
-==== General ==== +  * Determination of Angles and Momentum 
-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/Δp=2×10<sup>4</sup>), and large momentum and solid-angle acceptances (ΔΩ=20 msr, Δp/p=6%). The S800 layout is shown in Fig. 1. It consists of two parts: the analysis line and the spectrograph.  +  * Detectors 
- +  * Electronics 
- +  * Software 
-[[wiki:pirolilla]] +  * Data Acquisition 
- +  * Coupled Detectors/Devices 
- +  * Types of Experiments
-{{:wiki:s800_layout.png|}} +
- +
-=== Analysis Line === +
- +
-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. +
- +
-[[s800]] +
-pirola pirola +
- +
- +
-=== Spectrograph === +
-The spectrograph consist of two quadrupoles, a sextupole and two big 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 Table 1. 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.  +
- +
- +
- +
-Momentum Resolution (p/Δp)      | 2×10<sup>4</sup> +
-^ Momentum Acceptance             | 5.8%              +
-^ Angle Resolution                | 2 msr            | +
-^ Solid Angle Acceptance          | 7º×10º or 20 msr | +
-^ Momentum Dispersion (x/δ)       | 9.5 cm/%            +
-^ Angle Dispersion (y/b)          | 0.9 mm/mrad      |    +
-^ Magnification(x/x)              | 0.74             |  +
-^ Focal Plane Size (x × y)        | 55 cm ×15 cm     |  +
-^ Maximum Rigidity                | 4 Tm             |  +
-^ Detector Position Resolution (x)| 0.3 mm           | +
-^ Detector Position Resolution (y)| 0.3 mm           |+
  
 +===== Operation of the S800 =====
  
  
start.txt · Last modified: 2024/01/02 12:45 by pereira