By Stephen Nellis, Alexandra Alper and Arsheeya Bajwa WASHINGTON (Reuters) -Nvidia CEO Jensen Huang said on Tuesday that the artificial intelligence chip leader will build seven new supercomputers for the U.S. Department of Energy, and said the company has $500 billion in bookings for its AI chips. But Huang said the Chinese government has shut Nvidia out of its market, and that the company had not applied for U.S. export licenses of its newest chips because of the Chinese position. "They've made it very clear that they don't want Nvidia to be there right now," he said at a news conference during the company's GTC event. "I hope that will change in the future because I think China is a very important market." The world's most valuable company, worth close to $5 trillion, Nvidia is at the c

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