Injection of atomic hydrogen from a thermal cracker cell to plasma grid surface of a H− ion source

Surface production of negative hydrogen (H-) ions due to hydrogen atom impact has been confirmed in the actual ion source operating condition. Three types of atomic sources injected beams of atomic hydrogen (H0) into a cesiated/uncesiated hydrogen plasma confined in a small multicusp ion source. Hydrogen atoms produced by a thermal cracking and a microwave capacitively coupled plasma (CCP) sources decreased the amount of H− ions under the uncesiated conditions. Injection of hydrogen atoms from the thermal cracking source enhanced the H− ion current corresponding to the surface production at the plasma grid under the cesiated condition. Meanwhile, the H− ion enhancement by low temperature H0 injection from microwave discharge plasma was less pronounced. A series of experiments concluded that the electrons in high energy tails of the velocity distribution functions of produced hydrogen atoms from the CCP source and that from the thermal cracking source are capable to realize H− surface production.Surface production of negative hydrogen (H-) ions due to hydrogen atom impact has been confirmed in the actual ion source operating condition. Three types of atomic sources injected beams of atomic hydrogen (H0) into a cesiated/uncesiated hydrogen plasma confined in a small multicusp ion source. Hydrogen atoms produced by a thermal cracking and a microwave capacitively coupled plasma (CCP) sources decreased the amount of H− ions under the uncesiated conditions. Injection of hydrogen atoms from the thermal cracking source enhanced the H− ion current corresponding to the surface production at the plasma grid under the cesiated condition. Meanwhile, the H− ion enhancement by low temperature H0 injection from microwave discharge plasma was less pronounced. A series of experiments concluded that the electrons in high energy tails of the velocity distribution functions of produced hydrogen atoms from the CCP source and that from the thermal cracking source are capable to realize H− surface production.