;+ ;FUNCTION: e_sec_eff(Te) ;INPUT: ; Te: flt,fltarr electron temperature ;KEYWORDS ; pot flt,fltarr if fltarr, then n_elements(pot)=n_elements(te), default pot=0 ; tmax flt algorithm parameter, default tmax = 2.283 ; aa flt algorithm parameter, default aa = 1.35 ; emax flt algorithm parameter, default emax = 325 ; kk flt algorithm parameter, default kk = 2.2 ; sec_max flt algorithm parameter, default sec_max=2. ; te_sec flt algorithm parameter, default te_sec=2. ; ;PURPOSE: ; Returns the fractional secondary electron flux with energy > pot ;NOTES: ; ;CREATED BY: ; J.McFadden 09-05-31 ;LAST MODIFICATION: ;- function e_sec_eff,Te,pot=pot,tmax=tmax,aa=aa,emax=emax,kk=kk,sec_max=sec_max ; Make electron secondary energy efficiency array ; formula is an offshoot of the following MCP efficiency formula ; REF: Relative electron detection efficiency of microchannel plates from 0-3 keV ; R.R. Goruganthu and W. G. Wilson, Rev. Sci. Instrum. Vol. 55, No. 12 Dec 1984 if not keyword_set(pot) then pot = 0 if not keyword_set(tmax) then tmax = 2.283 if not keyword_set(aa) then aa = 1.35 if not keyword_set(emax) then emax = 325. ; 325 eV if not keyword_set(kk) then kk = 2.2 if not keyword_set(sec_max) then sec_max=2. if not keyword_set(te_sec) then te_sec=2. delta = ((Te+(pot>0.))/emax)^(1-aa)*(1-exp(-tmax*((Te+(pot>0.))/emax)^aa))/(1-exp(-tmax)) en_eff = exp(-20./Te)/exp(-20./emax)*exp(-(pot>0.)/te_sec)*exp((pot<0.)/Te)*sec_max*(1-exp(-kk*delta))/(1-exp(-kk)) return, en_eff end