NDLI: Experimental Study of Pellet Delivery to the ITER Inner Wall through a Curved Guide Tube at Steady-State Pressure

Content Provider	IEEE Xplore Digital Library
Author	Combs, S.K. Baylor, L.R. Caughman, J.B.O. Fehling, D.T. Foust, C.R. Maruyama, S. McGill, J.M. Rasmussen, D.A.
Copyright Year	2005
Description	Author affiliation: Oak Ridge Nat. Lab., TN (Combs, S.K.; Baylor, L.R.; Caughman, J.B.O.; Fehling, D.T.; Foust, C.R.)
Abstract	Injection of solid hydrogen pellets from the magnetic high-field side will be the primary technique for depositing fuel particles into the core of International Thermonuclear Experimental Reactor (ITER) burning plasmas. This injection scheme will require the use of a curved guide tube to route the pellets from the acceleration device, under the divertor, and to the inside wall launch location. In an initial series of pellet tests in support of ITER, single 5.3-mm-diam cylindrical $D_{2}$ pellets were shot through a mock-up of the planned ITER curved guide tube. Those data showed that the pellet speed had to be limited to ap300 m/s for reliable delivery of intact pellets. Also, microwave cavity mass detectors located upstream and downstream of the test tube indicated that ap10% of the pellet mass was lost in the guide tube at 300 m/s. The tube base pressure for that test series was $ap10^{-4}$ torr. However, for steady-state pellet fueling on ITER, the guide tube will operate at an elevated pressure due to the pellet erosion in the tube. Assuming the present design values for ITER pellet fueling rates/vacuum pumping and a 10% pellet mass loss during flight in the tube, calculations suggest a steady-state operating pressure in the range of 10-20 torr. Thus, experiments to ascertain the pellet integrity and mass loss under these conditions have been carried out. Also, some limited test data were collected at a tube pressure of ap100 torr. No significant detrimental effects have been observed at the higher tube pressures. The new test results are presented and compared to the baseline data previously reported
Starting Page	1
Ending Page	4
File Size	4268462
Page Count	4
File Format	PDF
ISBN	0424401596
DOI	10.1109/FUSION.2005.252923
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-09-26
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Steady-state Testing Solids Hydrogen Fuels Magnetic cores Inductors Plasma accelerators Plasma devices Acceleration ITER pellet injection inner wall curved guide tube plasma
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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