Extraction of D[sup −] beams from the cyclotron JULIC for injection into the cooler synchrotron COSY

Abstract

The cooler synchrotron COSY was intended from its inception to provide also deuteron beams which, in addition to protons, could considerably expand the range of experiments accessible at this accelerator facility. A major obstacle to deliver the required D¯ beams with the injector cyclotron JULIC has been its electrostatic septum deflector at extraction. After the conversion of JULIC into a negative ion machine, operation of the original deflector at the voltage levels necessary for D¯ extraction proved to be impossible with reversed polarity due to severe electrical strength problems like sparking and dark currents. The design and development of a suitable septum deflector turned out to be a challenging and tedious process lasting several years. The new device is in operation since January 2000 and the cyclotron was successfully tested in October for delivering D¯ beams at 75 MeV with an extracted current in the order of 10 µA. Development, test procedures and characteristics of the new electrostatic septum deflector are reported together with its operational performance to date. Results achieved during the first test run with D¯ ions are presented, including injection and acceleration of the deuteron beam in COSY.

Polarized H[sup −] and D[sup −] Beams at COSY∕Jülich

“…The layout of the synchrotron facility with its subsystems is depicted in fig. Polarized D" ions have been available since 2001 [4][5][6][7][8]. Since introduction of pulsed operation of main components of the source routinely 1 |j A of polarized H" ions are delivered for charge exchange injection into COSY.…”

Extraction of D[sup −] beams from the cyclotron JULIC for injection into the cooler synchrotron COSY

“…For nearly a decade already, the cyclotron JULIC is being operated almost exclusively as the injector for the cooler synchrotron COSY, which requires particles suitable for stripping injection. At first an H 2 + beam at 76 MeV has been used for this purpose, but since January 1996 either non-polarized or polarized H¯ beams at 45 MeV are routinely provided [1]. In recent years there is also a growing demand from experiments for deuteron beams at COSY.…”

Proton Beam Multiplexer Developments for Multi-Target Operation at the High-Brilliance Neutron Source HBS

“…JULIC (Juelich light ion cyclotron). It provides 45 MeV H −[3] and 76 MeV D −[4] beams with a maximum current of 10 µA in DC or pulsed mode. This accelerator serves as a test bench for multiple HBS related developments, e.g.…”