Is there anything akin to 'Jhana' in Zen Buddhism?

I have read about 'Jhana' in Ajahn Brahm's book, '**Mindfulness, bliss and beyond**'. It looks like, from his teaching of Theravada Buddhism, 'Jhana' is a pre-requisite to attain 'Nirvana'. I want to ask, is there anything similar to 'Jhana' in Zen. From my readings it does not seem it's 'Satori'.