Abstract
A set of multichord, absolutely calibrated viewing arrays has been used to measure the distributions of H/D and C+2 emissions. A total of 227 chordal views are available, with the chords separated at the plasma by ∼1 cm typically. The chord brightness profiles have been combined and inverted (without recourse to symmetry assumptions) to yield local volume emission rates. Because of the thickness of the superstructure surrounding Alcator C-Mod, the views are from points re-entrant to the vacuum vessel. All but one of the arrays employ 64-channel, linear diode arrays, which are read out serially, thus requiring only one digitizer channel per array. Variable frame rates (∼1 Hz to ∼3.5 kHz) result in an extremely large dynamic range for these detectors. A 35-channel diode array which is read out in parallel and can track fast events like ELMs or pellets is also in use.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 555-557 |
| Number of pages | 3 |
| Journal | Review of Scientific Instruments |
| Volume | 66 |
| Issue number | 1 |
| DOIs | |
| State | Published - 1995 |
| Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Instrumentation