Device for accelerating and storing charged particles

A device for accelerating and storing charged particles comprising:

• a vacuum duct which has two opposite linear portions and two opposite curved portions respectively connected to said linear portions and which function to maintain the orbit of revolution of charged particles in a vacuum;
• an accelerating means for accelerating the charged particles which is disposed in said orbit of said charged particles;
• a pair of bending magnets which are respectively disposed in said curved portions of said vacuum duct, wherein each of said bending magnets has a magnetic field gradient and wherein each of said bending magnets comprises a pair of main coils which hold the corresponding one of said curved portions of said vacuum ducts therebetween and which have coil surfaces at a certain angle with respect to each other;
• and
• a pair of quadrupole electromagnets which are respectively disposed on said linear portions of said vacuum duct and at least one of which is disposed at a position at a given distance from the center of the corresponding linear portion.