The atom trap, or also called magnetic trap, traps and holds the antihydrogen atoms.
The octupole magnet being wound at BNL
a. A schematic view of the ALPHA trap. Radial and axial confinement of antihydrogen atoms is provided by an octupole magnet (not shown) and mirror magnets, respectively. Penning trap electrodes are held at ~9 K, and have an inner diameter of 44.5 mm. A three-layer silicon vertex detector surrounds the magnets and the cryostat. A 1 T base field is provided by an external solenoid (not shown). An antiproton beam is introduced from the right, whereas positrons from an accumulator are brought in from the left. b. The magnetic-field strength in the y–z plane (z is along the trap axis, with z=0 at the centre of the magnetic trap). Green dashed lines in this and other figures depict the locations of the inner walls of the electrodes. c. The axial field profile, with an effective trap length of ~270 mm. d. The field strength in the x–y plane. e. The field-strength profile along the x axis. (from Confinement of antihydrogen for 1000s)
The octupole magnet being wound at BNL
a. A schematic view of the ALPHA trap. Radial and axial confinement of antihydrogen atoms is provided by an octupole magnet (not shown) and mirror magnets, respectively. Penning trap electrodes are held at ~9 K, and have an inner diameter of 44.5 mm. A three-layer silicon vertex detector surrounds the magnets and the cryostat. A 1 T base field is provided by an external solenoid (not shown). An antiproton beam is introduced from the right, whereas positrons from an accumulator are brought in from the left. b. The magnetic-field strength in the y–z plane (z is along the trap axis, with z=0 at the centre of the magnetic trap). Green dashed lines in this and other figures depict the locations of the inner walls of the electrodes. c. The axial field profile, with an effective trap length of ~270 mm. d. The field strength in the x–y plane. e. The field-strength profile along the x axis. (from Confinement of antihydrogen for 1000s)
