Design of the divertor Thomson scattering system on DIII-D
- General Atomics, San Diego, CA (United States)
- Lawrence Livermore National Lab., CA (United States)
Local measurements of n{sub e} and T{sub e} in the divertor region are necessary for a more complete understanding of divertor physics. We have designed an extension to the existing multipulse Thomson scattering system to measure n{sub e} in the range 5 {times} 10{sup 18} to 5 {times} 10{sup 20} m{sup {minus}3} and T{sub e} 5--500 eV, with 1 cm resolution from 1--21 cm above the floor of the DIII-D vessel, in the region of the X-point for lower single-null diverted plasmas. One of the existing 8, 20 Hz, ND:YAG lasers will be redirected to a separate vertical port, and viewed radially with a specially designed, f/6.8 lens. Fiber optics carry the light to additional polychromators whose interference filters have been optimized for low T{sub e} measurements. Other aspect of the system, including the beam path to the vessel, polychromator design, real time data acquisition, laser control, calibration facility, and DIII-D timing and data acquisition interface will be shared with the existing multipulse Thomson system. An in-situ laser alignment monitor will provide alignment information for each laser pulse.
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48; AC03-89ER51114
- OSTI ID:
- 10154612
- Report Number(s):
- UCRL-JC-116270; CONF-940552-7; ON: DE94012672; BR: 35AT10020/35KC07000; TRN: 94:012078
- Resource Relation:
- Conference: 10. topical conference on high-temperature plasma diagnostics,Rochester, NY (United States),8-12 May 1994; Other Information: PBD: May 1994
- Country of Publication:
- United States
- Language:
- English
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