.htaccess {QUERY_STRING} and issue with append a value

[Joydeep Bakshi <joydeep.bakshi@xxxxxxxxxxxxxx>]

Hello list,

Greetings !!

I am using {QUERY_STRING} to append a value to a particular URL.

The actual url is   http://www.mydomain.com/index.php?id=7&artId=7572&doi=10.5414/ALP33211

and it has to become 

http://www.mydomain.com/index.php?id=7&artId=7572&doi=10.5414/ALP33211&L=5

The &L=5 has to be appended

Hence I have made the .htaccess rule as

RewriteCond %{QUERY_STRING} ^Id=7572&doi=10.5414/ALP33211$
RewriteRule ^/ALP33211$  /ALP33211&L=1 [R=301]

But it is not working at all.  Have I done any misconfiguration ?
The mod_rewrite is already available and working.

Kindly suggest.

Thanks
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