concentrator

transitive verb concentrated, concentrating

1. to bring to, or direct toward, a common center
2. to collect or focus (one's thoughts, efforts, etc.)
3. to increase the strength, density, or intensity of

intransitive verb

1. to come to or toward a common center
2. to direct one's thoughts or efforts; fix one's attention (on or upon)
3. to increase in strength, density, or intensity

noun