Building a temporary wall

I've got my system in a finished basement, which is basically two rectangles of different lengths next to each other. I want to seperate them in a cheap and temporary way. The size of the barrier/wall would be about 20 ft. long and 8 ft. high. There's a wooden beam running the length of the ceiling right at the point I want to seperate. Right now I've got one of those thick canvas painter's tarp screwed into the beam, which hangs all the way to the floor. This works pretty well and is definitely cheap and temporary. Just wondering if anyone else has suggestions?

Thanks,
mjb