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Title: TFTR diagnostic vacuum controller

Abstract

The TFTR diagnostic vacuum controller (DVC) provides in conjunction with the Central Instrumentation Control and Data Acquisition System (CICADA), control and monitoring for the pumps, valves and gauges associated with each individual diagnostic vacuum system. There will be approximately 50 systems on TFTR. Two standard versions of the controller (A and B) wil be provided in order to meet the requirements of two diagnostic manifold arrangements. All pump and valve sequencing, as well as protection features, will be implemented by the controller.

Authors:
;
Publication Date:
Research Org.:
Princeton Univ, NJ, USA
OSTI Identifier:
6480068
Alternate Identifier(s):
OSTI ID: 6480068
Report Number(s):
CONF-811040-
Journal ID: CODEN: PSERD
Resource Type:
Conference
Resource Relation:
Journal Name: Proc. Symp. Eng. Probl. Fusion Res.; (United States); Conference: 9. symposium on engineering problems of fusion research, Chicago, IL, USA, 26 Oct 1981
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; TFTR REACTORS; CONTROL SYSTEMS; DATA ACQUISITION SYSTEMS; DIAGNOSIS; TURBOMOLECULAR PUMPS; VALVES; CONTROL EQUIPMENT; EQUIPMENT; FLOW REGULATORS; LABORATORY EQUIPMENT; PUMPS; THERMONUCLEAR REACTORS; TOKAMAK TYPE REACTORS; VACUUM PUMPS 700209* -- Fusion Power Plant Technology-- Component Development & Materials Testing

Citation Formats

Olsen, D., and Persons, R. TFTR diagnostic vacuum controller. United States: N. p., 1981. Web.
Olsen, D., & Persons, R. TFTR diagnostic vacuum controller. United States.
Olsen, D., and Persons, R. Thu . "TFTR diagnostic vacuum controller". United States. doi:.
@article{osti_6480068,
title = {TFTR diagnostic vacuum controller},
author = {Olsen, D. and Persons, R.},
abstractNote = {The TFTR diagnostic vacuum controller (DVC) provides in conjunction with the Central Instrumentation Control and Data Acquisition System (CICADA), control and monitoring for the pumps, valves and gauges associated with each individual diagnostic vacuum system. There will be approximately 50 systems on TFTR. Two standard versions of the controller (A and B) wil be provided in order to meet the requirements of two diagnostic manifold arrangements. All pump and valve sequencing, as well as protection features, will be implemented by the controller.},
doi = {},
journal = {Proc. Symp. Eng. Probl. Fusion Res.; (United States)},
number = ,
volume = ,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 1981},
month = {Thu Jan 01 00:00:00 EST 1981}
}

Conference:
Other availability
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  • The charge exchange diagnostic for the TFTR is comprised of two analyzer systems which contain a total of twenty independent mass/energy analyzers and one diagnostic neutral beam tentatively rated at 80 keV, 15 A. The associated vacuum systems were analyzed using the Vacuum System Transient Simulator (VSTS) computer program which models the transient transport of multi-gas species through complex networks of ducts, valves, traps, vacuum pumps, and other related vacuum system components. In addition to providing improved design performance at reduced cost, the analysis yields estimates for the exchange of tritium from the torus to the diagnostic components and ofmore » the diagnostic working gases to the torus.« less
  • A novel method for time resolved measurements of the 14 MeV neutron flux in an intense 2.5 MeV neutron and {gamma}-ray background has been developed. Discrimination against the background 2.5 MeV neutron and {gamma}-ray flux is achieved by the use of polyethylene and lead shielding. A high detection efficiency of DT neutrons is obtained by the use of large volume plastic scintillators and photomultiplier tube designed for operating in high magnetic field environments. Design computations for a such a detector system on TFTR show that an absolute detection efficiency of {approximately}10{sup {minus}8} counts per DT neutron may be obtained. Amore » source strength of 10{sup 13} DT n/s may readily be detected by this method using both count mode and current mode operation with a resolution of {approximately}10 ms within a statistical accuracy of {approximately}5%. 12 refs., 8 figs., 2 tabs.« less
  • \011A new spectroscopic diagnostic to measure poloidal velocity across the minor radius has recently been installed on TFTR. Data from a single channel already show marked changes in the measured poloidal velocity when the plasma conditions are actively modified, such as puffing helium to spoil supershot confinement or changing the co/counter mix of neutral beam injection. Preliminary measurements show apparent (i.e., line-integraded) carbon poloidal velocities up to 39 plus or minus 0.4 km/sec in reversed shear plasmas prior to the transition to enhanced confinement.\011This diagnostic complements the meaasurements of carbon, ion temperature, v(subscript phi), and n(subscript i) from existing chargemore » exchange spectroscopy sytstem and B(subscript theta) from MSE measurements allowing the measurement of radial electric field profiles using the force balance equation. A novel inversion technigue (Ref. 1) has been developed to calculate local poloidal rotation velocities from line-integrated measurements. Two opposing vertical views are used to eliminate lineshifts due to effects of the charge exchange cross section. The time resolution is 20 msec and the inversion will yield a radial resolution of {tilde}3.5 cm.\011This diagnostic has been operational during the last six weeks of TFTR operation and a number of plasma conditions have been documented. The complete diagnostic calibration and software development are in progress. Data will be presented reflecting the state of the analysis at the time of the meeting.\011(Ref. 1 = R.E. Bell, Rev. Sci. Instrum, Vol. 68 (1997) pg. 1273)« less
  • A 60 GHz gyrotron collective Thomson Scattering alpha particle diagnostic has been implemented for the D-T period on TFM. Gyrotron power of 0.1-1 kW in pulses of up to 1 second can be launched in X-mode. Efficient corrugated waveguides are used with antennaes and vacuum windows of the TFTR Microwave Scattering system. A multichannel synchronous detector receiver system and spectrum analyzer acquire the scattered signals. A 200 Megasample/sec digitizer is used to resolve fine structure in the frequency spectrum. By scattering nearly perpendicular to the magnetic field, this experiment will take advantage of an enhancement of the scattered signal whichmore » results from the interaction of the alpha particles with plasma resonances in the lower hybrid frequency range. Significant enhancements are expected, which will make these measurements possible with gyrotron power less than 1 kW, while maintaining an acceptable signal to noise ratio. We hope to extract alpha particle density and velocity distribution functions from the data. The D and T fuel densities and temperatures may also be obtainable by measurement of the respective ion cyclotron harmonic frequencies.« less