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The new centrifuge high-speed pellet injector for ASDEX Upgrade

Technical Report:

Abstract

We report on the new pellet injection system for refuelling the ASDEX Upgrade tokamak with cubic H{sub 2} or D{sub 2} pellets having alternative side lengths of 1.5, 1.75 and 2.0 mm and optional Ne doping. The system delivers series of about one hundred pellets at a maximum repetition rate of more than 40 Hz. The pellets are accelerated by means of a centrifuge with an optimized straight acceleration arm. This configuration minimizes the compulsive force acting on the pellet during the acceleration process. Since this also minimizes stresses inside the pellet, high velocities - a maximum of 1211 m/s being achieved - are possible without destroying the hydrogen cubes. A special pellet feed-in technique based on a static stop cylinder interrupting the acceleration path successfully reduced the horizontal scattering angle to values of less than {+-} 4 degrees. Thus, a high efficiency - with more than 90% of the pellets arriving within the acceptance angle - was achieved without using a guide tube. The whole system was found to work very reliably and reproducibly during the whole test operation period, covering about 10{sup 5} pellet shots. The new centrifuge, now integrated into the ASDEX Upgrade setup, has proved to  More>>
Publication Date:
Apr 01, 1993
Product Type:
Technical Report
Report Number:
IPP-1/274
Reference Number:
SCA: 700460; PA: DEN-94:0F0660; EDB-94:027930; ERA-19:007876; NTS-94:015642; SN: 94001136107
Resource Relation:
Other Information: PBD: Apr 1993
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; TOKAMAK DEVICES; PELLET INJECTION; FUEL INJECTION SYSTEMS; THERMONUCLEAR FUELS; HYDROGEN; DEUTERIUM; FUEL PELLETS; REACTOR COMPONENTS; DESIGN; PERFORMANCE TESTING; 700460; HEATING AND FUELING SYSTEMS; FUELS
OSTI ID:
10119773
Research Organizations:
Max-Planck-Institut fuer Plasmaphysik, Garching (Germany)
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Other: ON: DE94734001; TRN: DE94F0660
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
DEN
Size:
30 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Lang, P T, Andelfinger, C, Beck, W, Buchelt, E, Buechl, K, Cierpka, P, Kollotzek, H, Lang, R S, Prausner, G, Soeldner, F X, Ulrich, M, and Weber, G. The new centrifuge high-speed pellet injector for ASDEX Upgrade. Germany: N. p., 1993. Web.
Lang, P T, Andelfinger, C, Beck, W, Buchelt, E, Buechl, K, Cierpka, P, Kollotzek, H, Lang, R S, Prausner, G, Soeldner, F X, Ulrich, M, & Weber, G. The new centrifuge high-speed pellet injector for ASDEX Upgrade. Germany.
Lang, P T, Andelfinger, C, Beck, W, Buchelt, E, Buechl, K, Cierpka, P, Kollotzek, H, Lang, R S, Prausner, G, Soeldner, F X, Ulrich, M, and Weber, G. 1993. "The new centrifuge high-speed pellet injector for ASDEX Upgrade." Germany.
@misc{etde_10119773,
title = {The new centrifuge high-speed pellet injector for ASDEX Upgrade}
author = {Lang, P T, Andelfinger, C, Beck, W, Buchelt, E, Buechl, K, Cierpka, P, Kollotzek, H, Lang, R S, Prausner, G, Soeldner, F X, Ulrich, M, and Weber, G}
abstractNote = {We report on the new pellet injection system for refuelling the ASDEX Upgrade tokamak with cubic H{sub 2} or D{sub 2} pellets having alternative side lengths of 1.5, 1.75 and 2.0 mm and optional Ne doping. The system delivers series of about one hundred pellets at a maximum repetition rate of more than 40 Hz. The pellets are accelerated by means of a centrifuge with an optimized straight acceleration arm. This configuration minimizes the compulsive force acting on the pellet during the acceleration process. Since this also minimizes stresses inside the pellet, high velocities - a maximum of 1211 m/s being achieved - are possible without destroying the hydrogen cubes. A special pellet feed-in technique based on a static stop cylinder interrupting the acceleration path successfully reduced the horizontal scattering angle to values of less than {+-} 4 degrees. Thus, a high efficiency - with more than 90% of the pellets arriving within the acceptance angle - was achieved without using a guide tube. The whole system was found to work very reliably and reproducibly during the whole test operation period, covering about 10{sup 5} pellet shots. The new centrifuge, now integrated into the ASDEX Upgrade setup, has proved to be a reliable unit even for long operation periods thus affording the possibility of quasicontinuous particle refuelling throughout a plasma discharge in ASDEX Upgrade. (orig.)}
place = {Germany}
year = {1993}
month = {Apr}
}