Fast electron accumulation and its mechanism in a harmonic trap under ultrahigh vacuum conditions

Mohamed, T.; Imao, H.; Oshima, N.; Mohri, A.; Yamazaki, Y.
March 2011
Physics of Plasmas;Mar2011, Vol. 18 Issue 3, p032507
Academic Journal
We present here a fast and efficient electron accumulation in a multiring trap (MRT) in a superconducting solenoid of 5 T. More than 1010 electrons were accumulated within a fraction of a second for an electron beam in the range of 10-7 A. The MRT was installed in a cryogenic bore tube cooled down to ∼10 K. Electron accumulation as a function of various parameters such as the beam intensity, the MRT depth, and the MRT length was studied. We succeeded in extracting a consistent picture of the electron accumulation mechanisms, which consist of interactions of the incoming electron beam with the reflected beam and with the electrons trapped in the MRT.


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