As the LHC beams cannot be polarized,introducing a dense polarized gas target at the LHCb experiment at CERN,to be operated concurrently with beam-beam collisions,will facilitate fixed-target interactions to explore a...As the LHC beams cannot be polarized,introducing a dense polarized gas target at the LHCb experiment at CERN,to be operated concurrently with beam-beam collisions,will facilitate fixed-target interactions to explore a new energy regime of spin physics measurements.Unfortunately,typical surface coatings used to avoid polarization losses,such as water,Teflon,or aluminum,are prohibited due to restrictions imposed by vacuum and beam policies.The former atomic beam source for the polarized target at ANKE@COSY(Forschungszentrum Jülich),an accompanying Lamb-shift polarimeter,and a storage cell chamber inside a superconducting magnet provide a perfect test stand to investigate the properties of a storage cell coated with amorphous carbon.A significant recombination rate,ranging from 93% to 100%,and preservation of polarization during recombination surpassing 74% were observed.We successfully produced H2 molecules with a nuclear polarization of P~0.59.In addition,we could produce polarized H3+ions for the first time and observed the shift of the axis of rotation within HD molecules.展开更多
基金funding from the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)-533904660。
文摘As the LHC beams cannot be polarized,introducing a dense polarized gas target at the LHCb experiment at CERN,to be operated concurrently with beam-beam collisions,will facilitate fixed-target interactions to explore a new energy regime of spin physics measurements.Unfortunately,typical surface coatings used to avoid polarization losses,such as water,Teflon,or aluminum,are prohibited due to restrictions imposed by vacuum and beam policies.The former atomic beam source for the polarized target at ANKE@COSY(Forschungszentrum Jülich),an accompanying Lamb-shift polarimeter,and a storage cell chamber inside a superconducting magnet provide a perfect test stand to investigate the properties of a storage cell coated with amorphous carbon.A significant recombination rate,ranging from 93% to 100%,and preservation of polarization during recombination surpassing 74% were observed.We successfully produced H2 molecules with a nuclear polarization of P~0.59.In addition,we could produce polarized H3+ions for the first time and observed the shift of the axis of rotation within HD molecules.
