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magnets [2013/10/17 21:15]
pereira
magnets [2013/10/17 21:24]
pereira
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 ===== Spectrograph Quadrupole Doublet ===== ===== Spectrograph Quadrupole Doublet =====
-In order to maximize the acceptance of the spectrograph, a doublet of superconducting quadrupoles is installed upstream of the two main dipoles ((Ref. to Thesis quads)). The doublet focuses  the transmitted particles first in the non-dispersive and then in the dispersive directions. The quadrupoles are the iron-dominated type used in the NSCL beamlines, but with larger dimensions.  The pole tip of each quad has a length of 30 cm and a radius of 12 cm for the first quad and  21 cm for the second one (i.e. almost twice and three times larger than the beamline quadrupoles, respectively). The doublet weights 5 Tons, including the sextupole at the end of the second quad. The field gradient  of the first quadrupole is 19.7 T/m at a maximum operation current of 86 A. The field gradient of the second one is  7.5 T/m at a maximum operation current of 90 A.  Both quadrupoles have cryogenic Hall generators mounted on the pole tips to measure the  field gradient during operation.  The quadrupoles don’t have protection circuit since they can quench with no damage to the coils.+In order to maximize the acceptance of the spectrograph, a doublet of superconducting quadrupoles is installed upstream of the two main dipoles ((Ref. to Thesis quads)). The doublet focuses  the transmitted particles first in the non-dispersive and then in the dispersive directions. The quadrupoles are the iron-dominated type used in the NSCL beamlines, but with larger dimensions.  The pole tip of each quad has a length of 30 cm and a radius of 12 cm for the first quad and  21 cm for the second one (i.e. almost twice and three times larger than the beamline quadrupoles, respectively). The doublet weights 5 Tons, including a [[Magnets#Spectrograph Sextupole|sextupole]] installed at the end of the second quad. The field gradient  of the first quadrupole is 19.7 T/m at a maximum operation current of 86 A. The field gradient of the second one is  7.5 T/m at a maximum operation current of 90 A.  Both quadrupoles have cryogenic Hall generators mounted on the pole tips to measure the field gradient during operation.  The quadrupoles don’t have protection circuit since they can quench with no damage to the coils.
  
  
 ===== 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 ((Ref. to Thesis sextupole)) installed around the bore tube of the second quadrupole in the [[Magnets#Spectrograph Quadrupole Double|quadrupole-doublet]] of the spectrograph. The purpose of this element is to correct the broadening of the beam at the focal plane due to the dominant (x|b<sup>2</sup>) 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. 
  
  
magnets.txt · Last modified: 2013/12/29 16:43 by pereira