Physics – Nuclear Physics
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..dnp.ck078z&link_type=abstract
American Physical Society, Division of Nuclear Physics Meeting, 27-30 October, 2004, Chicago, IL. MEETING ID: DNP04., abstract #
Physics
Nuclear Physics
Scientific paper
Samuel Zenobia and the MARS group at The Cyclotron Institute-Texas A University. In December of 2003 the MARS group realized there was a leak in one of the coils of the magnet of MARS's (momentum achromat recoil separator) velocity filter. The back end of MARS from the second dipole downward was disassembled in late February-March of 2004. Necessary repairs were made to the velocity filter coil and reassembly of MARS began in June 2004. The velocity filter, D3, S2, Q4, and Q5 had to be removed. Upon reassembly each of these elements was put back into place using previously aligned reference points and a transit system. Along with these optics elements the detector chamber and collimating slits were remounted back in place and realigned using the same system. On July 21st a two day experiment was performed to test the performance of MARS. A 13C beam was used to bombard a hydrogen gas target, producing a 13N secondary beam. This radioactive beam was used to test the resolution and realignment of MARS. Results showed the MARS resolution to be at least equal or slightly better than previous resolution. Possible reasons for the improvement may be a result of improving the vacuum system, the sealing of a slight leak in D3, and the improved alignment of the velocity filter. The results showing the purity and parameters of the secondary radioactive beam are presented and discussed.
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