SAN DIEGO — The Raiders felt right at home Sunday during a dominant first half against the San Diego Chargers.

With a huge throng of Raiders fans at Qualcomm Stadium providing at least as much vocal support for the visitors, Oakland played its best half of the season in taking a 30-6 lead.

Derek Carr was 17 of 22 through the air for 215 yards and Amari Cooper caught four passes for 117 yards and a touchdown. Cooper became the third rookie since 1970 with 500 receiving yards in his first six games, joining Randy Moss and Anquan Boldin.

The Raiders started quick as linebacker Malcolm Smith intercepted the second pass of the game by Chargers’ quarterback Philip Rivers. Safety TJ Carrie had Stevie Johnson well covered and deflected the pass that was picked off and returned to the 2-yard line. Raiders running back Latavius Murray carried it in for the touchdown and an early Oakland advantage.

The Raiders forced a three-and-out and went on an 11-play drive that came up short but still resulted in a 29-yard field goal by Sebastian Janikowski. San Diego got on the board with Josh Lambo’s 40-yard field goal late in the first quarter.

The Raiders got back to work with a tremendously efficient drive. Murray had a 17-yard run, followed by a 13-yard run by Taiwan Jones. Amari Cooper notched his first catch of the day for 15 yards and rookie tight end Clive Walford grabbed a perfect 23-yard pass from Carr for his first NFL touchdown and a 17-3 lead.

The defense took control and DJ Hayden intercepted a Rivers pass to Keenan Allen to set up the offense again. It was his first interception of the season and third of his career, two of which have come against Rivers.

The Raiders had to settle for a 32-yard Janikowski field goal after stalling in the red zone and Janikowski added another one from 31 yards. That drive was inhibited by a 15-yard unnecessary roughness penalty on Donald Penn after Oakland had reached the 1-yard line.

The Raiders stopped the Chargers again and added a huge punctuation mark to the half. Carr scrambled for to convert a third down and keep the drive alive. A play later, he threw a screen pass to Cooper and he took over from there.

The first-round pick picked up a downfield block from Rodney Hudson and then delivered a cut that brought Chargers safety Jimmy Wilson to his knees while going 52 yards for a touchdown and a 30-3 lead.

San Diego drove down for another Lambo field goal to close the half, but the Raiders were well in control with their best first half since taking a 38-7 lead at Denver in 2010 of an eventual 59-14 win.

Rivers looked nothing like the quarterback who threw for a franchise-record 503 yards last week in a loss at Green Bay. With Antonio Gates out with a knee injury and running back Melvin Gordon active, but not on the field, Rivers completed 15 of 23 passes for just 105 yards in the first half.

The Raiders outgained San Diego 267-139 and had 13 first downs to the Chargers’ 7.