determination_of_angles_and_momentum

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determination_of_angles_and_momentum [2013/10/18 14:23] pereira |
determination_of_angles_and_momentum [2020/02/14 10:51] pereira [Calculation of the inverse map] |
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===== Ion-optic coordinates in the S800 ===== | ===== Ion-optic coordinates in the S800 ===== | ||

- | The optical coordinates used in the S800 are described in relation to a central trajectory passing through the center of the S800 magnets, and with the reference momentum given by //((Note that since the S800 bending dipoles are oriented vertically, the coordinate //x// corresponds to the vertical direction, while //y// refers to the horizontal direction)) The dispersive and non-dispersive angles //a// and //b// are referred with respect to the //z// axis in the // | + | The optical coordinates used in the S800 are described in relation to a central trajectory passing through the center of the S800 magnets, and with the reference momentum given by //.) The dispersive and non-dispersive angles //a// and //b// are referred with respect to the //z// axis in the // |

===== Reconstruction method ===== | ===== Reconstruction method ===== | ||

- | With the exception of the [[Magnets#Recontruction 1)) uses the ion optics code COSY Infinity ((Ref)) to calculate the transfer matrix //S// from the target to the focal plane, including aberrations up to 5<S800 [[SpecTcl]] analysis software provides all necessary functions and interfaces to perform these calculations. | + | With the exception of the [[Magnets#M. Berz, K. Joh, J. A. Nolen, B. M. Sherrill, and A. F. Zeller, Phys. Rev. C 47, 537 (1993))) uses the ion optics code [[http://COSY Infinity]] to calculate the transfer matrix //S// from the target to the focal plane, including aberrations up to 5<S800 SpecTcl|S800 SpecTcl]] analysis software provides all necessary functions and interfaces to perform these calculations. |

===== Calculation of the inverse map ===== | ===== Calculation of the inverse map ===== | ||

- | Since the energy coordinate //d// is one of the quantities deduced from the inverse map, the beam position x<Matched|dispersion-matched mode]], where the incoming beam is momentum dispersed—and therefore rather large—on the target. In that case it is the size at the object location that matters since the entire S800 ([[Introduction#Users can request these inverse maps for which only the magnet strengths, magnetic rigidity, and the particle (A,Z) are necessary. The calculation of the inverse is not automated (yet!) and therefore a latency of a few days is to be expected before receiving the map file. | + | Since the energy coordinate //d// is one of the quantities deduced from the inverse map, the beam position //x<// cannot be calculated and is assumed to be zero. This assumption implies that the final resolution is obtained by folding the finite size of the beam spot in that direction with the size obtained from the reconstruction,of Operation#Dispersion-matching Mode|dispersion-matching mode]], where the incoming beam is momentum dispersed—and therefore rather large—on the target. In that case it is the size at the object location that matters since the entire S800 ([[Introduction# |

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+ | **Instructions on how to calculate the inverse transfer maps can be found [[mapserver|here]]**. | ||

determination_of_angles_and_momentum.txt · Last modified: 2022/06/09 15:08 by pereira