When I use Media View ,my session deleted

i use my custom auth system in my project and it save user
informatin into session(no used Auth Component)

$this->Session->write( 'Cms.User', array (...) );

when is use This Code

function profile_donwload( $paperID )
{
if ( $file = $this->Paper->Attachment->read( null, $paperID ) )
{
$this->view = 'Media';
$params = array(
'id' => 'paper.'.$file['Attachment']['format'],
'name' => $file['Attachment']['fname'],
'download' => true,
'extension' => $file['Attachment']['format'],
'path' => WWW_ROOT .'data'.DS.$file['Attachment']
['for'].DS.$file['Attachment']['paper_id'].DS
);
$this->set($params);
}
}

after Downloading file or Canceling it ,my session's deleted,why ?

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