How in the chapter first page the left header title page?

How can the title of the chapter be on the left side header of the first page and be done according to the format to continue the chapter?

documentclass[12pt,a4paper]{book}
%%%%%%%%%%%%Tikz%%%%
usepackage{fancyhdr}
usepackage{lipsum}
usepackage{fontspec}
usepackage{titlesec}

pagestyle{fancy}
% with this we ensure that the chapter and section
newfontfamilyheadingfont[]{Arial}
% headings are in lowercase.
renewcommand{chaptermark}[1]{%
markboth{thechapter #1}{}}
renewcommand{sectionmark}[1]{%
markright{thesection #1}}
fancyhf{} % delete current header and footer
fancyhead[LE,RO]{smallheadingfontthepage}
fancyhead[LO]{smallheadingfontrightmark}
fancyhead[RE]{smallheadingfontleftmark}
fancyfoot[LE]{smallheadingfont{Dissertation Vorname Name}}
fancyfoot[LO]{smallheadingfont{Dissertation Vorname Name}}
renewcommand{headrulewidth}{0.5pt}
renewcommand{footrulewidth}{0.5pt}
addtolength{headheight}{0.5pt} % space for the rule
fancypagestyle{plain}{%
fancyhead{} % get rid of headers on plain pages
renewcommand{headrulewidth}{0pt} % and the line
}

titleformat{chapter}[hang] 
{normalfonthugebfseriessffamily}{thechapter}{40pt}{Huge}   
titlespacing*{chapter}{0pt}{0pt}{30pt}

titlelabel{thetitle.quad}

begin{document}
chapter{Introduction}
thispagestyle{fancy}
lhead{1~~Introduction}


lipsum[1-20]
end{document}

Fig:1

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