Applying the same logic to the stellarator appeared to offer the same advantages. The early emphasis was on three main systems&colon; z-pinch, stellarator, and magnetic mirror. Since the 1990s, this has led to renewed interest in the stellarator design. Construction of the stellarator was originally expected to reach completion in 2006. The HSX is the first stellarator to use a quasisymmetric magnetic field. He called this concept the stellarator. It is the second largest superconducting stellarator in the world, after the Wendelstein 7-X. At present, it is Germany's second largest fusion experiment after stellarator Wendelstein 7X. The tokamak essentially combined a low-power pinch device with a low-power simple stellarator. In May he was awarded $50,000 to begin research on his stellarator concept. As the problems with the tokamak approach grew, interest in the stellarator approach reemerged. In the stellarator, no such natural heating source is present. By the mid-1960s it appeared the stellarator approach was a dead end. Devices like the z-pinch and stellarator had attempted this, but demonstrated serious instabilities. While riding the ski lift, he hit upon the stellarator concept.