Antiproton Recycling Ring
At present, the only place in the world where experiments utilizing low-energy antiprotons can be performed is the AD at CERN. The MUSASHI trap, part of the ASACUSA installation, enables access to antiproton energies of a few hundreds of eV. Unfortunately the available beam quality and luminosity is not sufficient for collision experiments on the level of differential cross sections. A small electrostatic ring, and associated electrostatic acceleration section, has been designed and developed by the QUASAR Group. This small antiproton recycler ring is unique due to its combination of size, electrostatic nature and energy of the circulating particles.
Scale drawing of the injection beamline and the recycling ring. TB2 denotes the location of a test beamline for setting up the ring when it is attached to the Musashi beamline. TB1 denotes the location of a test beamline for testing the injection beamline.
The ring and injector have been designed as relatively compact mobile facilities to enable them to be moved worldwide and used on a variety of different types of sources, including different charged projectiles; they can be used for a wide variety of applications and experiments. A 3-D model of the recycler ring is shown below and includes the vacuum system and ion pumps, supports and ring alignment mechanisms. The ring optics are all electrostatic and comprise 90° cylindrical deflectors and quadrupole triplets and singlets. The ring has been designed to be a prototype for the USR and to meet the needs of the crossed beam studies.
Currently involved QUASARs:
Selected publications:
O. Karamyshev, G. Karamysheva, A. Papash, M. R. F. Siggel-King, C. P. Welsch, 'Design of the injector for a small recycling ring on the CERN-AD', Nucl. Instr. Meth. A vol 700 pp 182-187 (2012)
M. R. F. Siggel-King, C. P. Welsch, O Karamyshev, A. Papash, 'An antiproton recycler for atom-antiproton collision experiments', Proc. IPAC, New Orleans, USA (2012)
M.R.F. Siggel-King, A.I. Papash, H. Knudsen, M. Holzscheiter and C.P. Welsch, 'Electrostatic ultra-low-energy antiproton recycling ring', Hyperfine Interactions 199 (2011)