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magnets [2013/12/24 08:57] pereira [Spectrograph Dipoles] |
magnets [2013/12/24 08:59] pereira [Spectrograph Quadrupole Doublet] |
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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 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. | In order to maximize the acceptance of the spectrograph, a doublet of superconducting quadrupoles is installed upstream of the two main dipoles. 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. The picture above (right figure), shows the chamber (yellow) with the quadrupole doublet at the "entrance" of the spectrograph. |
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