SKS Cryogenic System Home Page
News (Upper is newer)
The cryogenic systems of a sector type superconducting spectrometer
magnet SKS was constructed for nuclear physics experiments at 12 GeV PS
North-hall of KEK in 1991. The total weight of the magnet is 280 ton with the
iron yoke. A mediun-size refrigerator, which has a refrigeration power of
300 W at 4.5 K with liquid nitrogen precooling, was required to cool down the
magnet to 4.2 K and keep it in the same temperature. In addition to the
medium-size refrigerator, a small-size G-M refrigerator was installed on a
service port of the helium vessel to cool the 80 K and 20 K thermal insulators
which are surrouding the superconducting magnet inside the vacuum vessel.
These systems make the heat leak as small as possible in cooperation together.
The other feature is that the helium transfar line between the magnet and the
medium-size cold box is flexible to make the magnet be movable in large angle
from -10 degree to +40 degree to measure angular distributions for nuclear
physics experiments. For this purpose, some special devices were required.
The all states of cryogenic systems including the magnet and the medium-size
and the small-size refrigerators are monitored and full-automatically
controlled at the central control room with large process controllers and
Schedule (Upper is newer)
Shift person always has a dedicated KEK-PHS 2406.
System Status (kek.jp domain only)
Cryogenic System and Superconducting Magnet Data from YOKOGAWA CENTUM-XL and Data Logger
Information (kek.jp domain only)
SKS Spectrometer home page
12 GeV PS Experimental Facility home page
12 GeV PS Experiment home page
IPNS Cryogenic Group home page
KEK Welcome home page
Last Updated: '03/06/09
Created by Cryogenics Group