A downhole pumping assembly has a tubing string with plural barrels which are arranged in-line with the tubing. The present invention relates a halogen-containing aromatic acid dianhydride, halogen-containing aromatic tetranitrile compound, halogen-containing m-phenylenediamine compound and fluorine compound, and a method thereof. Fluid passages in the honeycomb sheet-like structures provide a place for fluid to affect electrical characteristics of the ionizer assembly andor to provide for cooling. Next, a surface pinning layer is formed in the charge collection well, the surface pinning layer comprising dopants of a second doping polarity opposite to the first doping polarity. Also, a configuration is provided wherein control information does not overlap a predetermined screen region.