@inproceedings{0292cd05c7b84c25aa84e2ac591d41f9,
title = "Experimental study of pellet delivery to the ITER inner wall through a curved guide tube at steady-state pressure",
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 D2 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 ≈300 m/s for reliable delivery of intact pellets. Also, microwave cavity mass detectors located upstream and downstream of the test tube indicated that ≈10% of the pellet mass was lost in the guide tube at 300 m/s. The tube base pressure for that test series was ≈10-4 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 steadystate 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 ≈100 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.",
keywords = "Curved guide tube, ITER, Inner wall, Pellet injection, Plasma",
author = "Combs, {S. K.} and Baylor, {L. R.} and Caughman, {J. B.O.} and Fehling, {D. T.} and Foust, {C. R.} and S. Maruyama and McGill, {J. M.} and Rasmussen, {D. A.}",
year = "2005",
doi = "10.1109/FUSION.2005.252923",
language = "English",
isbn = "142440150X",
series = "Proceedings - Symposium on Fusion Engineering",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
booktitle = "21st IEEE/NPS Symposium on Fusion Engineering, SOFE'05",
note = "21st IEEE/NPS Symposium on Fusion Engineering, SOFE'05 ; Conference date: 26-09-2005 Through 29-09-2005",
}