Thomson scattering diagnostic upgrade on DIII-D

Ponce-Marquez, D. M.; Bray, B. D.; Deterly, T. M.; Liu, C.; Eldon, D.
October 2010
Review of Scientific Instruments;Oct2010, Vol. 81 Issue 10, p10D525
Academic Journal
The DIII-D Thomson scattering system has been upgraded. A new data acquisition hardware was installed, adding the capacity for additional spatial channels and longer acquisition times for temperature and density measurements. Detector modules were replaced with faster transimpedance circuitry, increasing the signal-to-noise ratio by a factor of 2. This allows for future expansion to the edge system. A second phase upgrade scheduled for 2010-2011 includes the installation of four 1 J/pulse Nd:YAG lasers at 50 Hz repetition rate. This paper presents the first completed phase of the upgrade and performance comparison between the original system and the upgraded system. The plan for the second phase is also presented.


Related Articles

  • Note: Multi-pass Thomson scattering measurement on the TST-2 spherical tokamak. Togashi, H.; Ejiri, A.; Hiratsuka, J.; Nakamura, K.; Takase, Y.; Yamaguchi, T.; Furui, H.; Imamura, K.; Inada, T.; Kakuda, H.; Nakanishi, A.; Oosako, T.; Shinya, T.; Sonehara, M.; Tsuda, S.; Tsujii, N.; Wakatsuki, T.; Hasegawa, M.; Nagashima, Y.; Narihara, K. // Review of Scientific Instruments;2014, Vol. 85 Issue 5, p1 

    In multi-pass Thomson scattering (TS) scheme, a laser pulse makes multiple round trips through the plasma, and the effective laser energy is enhanced, and we can increase the signal-to-noise ratio as a result. We have developed a coaxial optical cavity in which a laser pulse is confined, and we...

  • Improved pyroelectric detectors for single crystal adsorption calorimetry from 100 to 350 K. Lew, Wanda; Lytken, Ole; Farmer, Jason A.; Crowe, Matthew C.; Campbell, Charles T. // Review of Scientific Instruments;Feb2010, Vol. 81 Issue 2, p024102 

    The adsorption of atoms and molecules on single crystal surfaces allows one to produce well-characterized atomic, molecular, or dissociated adsorbates. Microcalorimetric measurement of the resulting adsorption energies, i.e., single crystal adsorption calorimetry, allows determination of the...

  • Studies on scattering of laser radiation from viewing dump in tokamak Thomson scattering system. Kumar, R.; Singh, R.; Kumar, A. // Applied Physics B: Lasers & Optics;Aug2012, Vol. 108 Issue 2, p325 

    Thomson scattering is among one of the primary diagnostics used for tokamak plasma temperature and density measurements. Spuriously scattered stray signal further deteriorates the already existing poor signal-to-noise ratio in this technique. The present paper reports experimental investigations...

  • OPTIMISATION OF PROCESSING CONDITION USING TAGUCHI METHOD ON WARPAGE FOR HDPE- CLAY COMPOSITE. Ibrahim, M. H. I.; Manaff, M. H. A.; Othman, M. H.; Mustafa, N.; Masrol, S. R.; Rafa, N. H. // Applied Mechanics & Materials;2014, Issue 660, p28 

    Injection molding is one of the most important processes in manufacturing nowadays. Thus, attention must be given towards the optimization of the product defects. Parameters have been chosen by screening tests to improve the process quality. The main purpose of this study is to optimize the...

  • Modeling and the signal-to-noise ratio research of magnetoelectric sensors at low frequency. Xing, Zengping; Li, Jiefang; Viehland, Dwight // Applied Physics Letters;10/1/2007, Vol. 91 Issue 14, p142905 

    The authors have modeled magnetoelectric (ME) laminate sensor units by considering both the ME laminate and detection circuitry. Theory predicts and experiments confirm that the signal-to-noise ratio increases with increasing frequency in the low frequency range. Our findings provide useful...

  • Signal to noise in the search for gravitational waves. Schulte, Bruce; Schnabel, Roman // Physics Today;Sep2012, Vol. 65 Issue 9, p8 

    A letter to the editor is presented in response to an article related to gravitational wave detection with the help of signal to noise by Johanna Miller in the November, 2011 issue.

  • Design of collective Thomson scattering system using 77 GHz gyrotron for bulk and tail ion diagnostics in the large helical device. Nishiura, M.; Tanaka, K.; Kubo, S.; Saito, T.; Tatematsu, Y.; Notake, T.; Kawahata, K.; Shimozuma, T.; Mutoh, T. // Review of Scientific Instruments;Oct2008, Vol. 79 Issue 10, p10E731 

    Collective Thomson scattering (CTS) system is expected to be a strong diagnostic tool for measuring thermal and fast ion distribution function at a local point inside plasmas. The electron cyclotron resonance heating system using a gyrotron at the frequency range of 77 GHz has been installed at...

  • Initial results of the high resolution edge Thomson scattering upgrade at DIII-D. Eldon, D.; Bray, B. D.; Deterly, T. M.; Liu, C.; Watkins, M.; Groebner, R. J.; Leonard, A. W.; Osborne, T. H.; Snyder, P. B.; Boivin, R. L.; Tynan, G. R. // Review of Scientific Instruments;Oct2012, Vol. 83 Issue 10, p10E343 

    Validation of models of pedestal structure is an important part of predicting pedestal height and performance in future tokamaks. The Thomson scattering diagnostic at DIII-D has been upgraded in support of validating these models. Spatial and temporal resolution, as well as signal to noise...

  • Performance Analysis of Energy Detector Over $$\alpha -\mu $$ Fading Channels with Selection Combining. Darawsheh, Hikmat; Jamoos, Ali // Wireless Personal Communications;Jul2014, Vol. 77 Issue 2, p1507 

    Energy detection is the most widely used technique in cognitive radio networks to enable opportunistic spectrum access. In this paper, the problem of energy detection of an unknown deterministic signal over fading channels is revisited. More particularly, a new closed-form mathematical...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics