Sympathetic cooling is a method used to lower the kinetic energy of ions with complicated energy-level structures,via Coulomb interactions with laser-cooled ions in an ion trap.The ion to be sympathetically cooled is ...Sympathetic cooling is a method used to lower the kinetic energy of ions with complicated energy-level structures,via Coulomb interactions with laser-cooled ions in an ion trap.The ion to be sympathetically cooled is sometimes prepared outside of the trap,and it is critical to introduce this ion into the trap by temporarily lowering the potential of one endcap without allowing the coolant ion to escape.We study the time required for a laser-cooled ion to escape from a linear Paul trap when the voltage of one endcap is lowered.The escape time is on the order of a few microseconds,and varies significantly when the low-level voltage changes.A re-cooling time of a maximum of 13 s was measured,which can be reduced to approximately one hundred of milliseconds by decreasing the duration of the low-level voltage.The measurement of these critical values lays the foundation for the smooth injection and cooling of the ion to be sympathetically cooled.展开更多
Ion deceleration has played a critical role in ion-related research when the ions are produced in the form of a high-energy beam.We present a deceleration method combining electrostatic lens and ion trap technique,whi...Ion deceleration has played a critical role in ion-related research when the ions are produced in the form of a high-energy beam.We present a deceleration method combining electrostatic lens and ion trap technique,which can effectively decelerate ions to energy below the trapping potential of a typical ion trap.The experiments were performed on metastable 1s2s3S1Li+ions,and demonstrated that the kinetic energy could easily be reduced from^450 e V to a few e V,with the latter being confirmed using the Doppler-shifted fluorescence spectra.展开更多
基金Supported by the National Natural Science Foundation of China(Grant Nos.11934014,11622434 and 11804373)the Scientific Instrument Developing Project of the Chinese Academy of Sciences(Grant No.YZ201552)+2 种基金the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant Nos.XDB21030100 and XDB21030300)CAS Youth Innovation Promotion Association(Grant Nos.Y201963 and 2018364)the Hubei Province Science Fund for Distinguished Young Scholars(Grant No.2017CFA040)。
文摘Sympathetic cooling is a method used to lower the kinetic energy of ions with complicated energy-level structures,via Coulomb interactions with laser-cooled ions in an ion trap.The ion to be sympathetically cooled is sometimes prepared outside of the trap,and it is critical to introduce this ion into the trap by temporarily lowering the potential of one endcap without allowing the coolant ion to escape.We study the time required for a laser-cooled ion to escape from a linear Paul trap when the voltage of one endcap is lowered.The escape time is on the order of a few microseconds,and varies significantly when the low-level voltage changes.A re-cooling time of a maximum of 13 s was measured,which can be reduced to approximately one hundred of milliseconds by decreasing the duration of the low-level voltage.The measurement of these critical values lays the foundation for the smooth injection and cooling of the ion to be sympathetically cooled.
基金Supported by the Scientific Instrument Developing Project of the National Natural Science Foundation of China(Grant Nos.11934014,11622434,and 11804373)the Scientific Instrument Developing Project of the Chinese Academy of Sciences(Grant No.YZ201552)+2 种基金the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant Nos.XDB21010400 and XDB21030300)CAS Youth Innovation Promotion Association(Grant Nos.Y201963 and 2018364)the Hubei Province Science Fund for Distinguished Young Scholars(Grant No.2017CFA040)。
文摘Ion deceleration has played a critical role in ion-related research when the ions are produced in the form of a high-energy beam.We present a deceleration method combining electrostatic lens and ion trap technique,which can effectively decelerate ions to energy below the trapping potential of a typical ion trap.The experiments were performed on metastable 1s2s3S1Li+ions,and demonstrated that the kinetic energy could easily be reduced from^450 e V to a few e V,with the latter being confirmed using the Doppler-shifted fluorescence spectra.
