There are several ways to make a linear beam from reflective material and these videos should help. GreenPowerScience sells amazing film for parabolic YOU CAN USE SOLAR REFLECTIVE MIRROR ADHESIVE PART A, PART B WORKS BEST. Stainless Mirror is an awesome optionStainless Mirror available in different sizes from GreenPowerScience.
	These videos are from GreenPowerScience.
			Trough mirror for a linear beam solar collector. BOOSTER ENERGY CONCENTRATOR