Abstracts Brochure - CERN

WEPLS — Poster Session 28-Jun-06 16:00 - 18:00
projects. Using this approach, we analyze the measured random field errors of the main dipoles of the LHC, Tevatron,
RHIC and HERA projects in order to find out the precision of the conductor positioning reached during the
production of these magnets. The method can be used to obtain more refined estimates of the random components
for future projects.
Experience with the Quality Assurance of the Superconducting Electrical Circuits of the
LHC Machine
The coherence between the powering reference
database and the Electrical Quality Assurance
(ELQA) is guaranteed on the procedural
level. However, a challenge remains
D. Bozzini, V. Chareyre, K.H. Mess, S. Russenschuck (CERN) A.
Kotarba, S. Olek (HNINP)
the coherence between the database, the magnet test and assembly procedures, and the connection of all superconducting
circuits of the LHC. In this paper, the methods, tooling, and procedures for the ELQA during the assembly
phase of the LHC will be presented in view of the practical experience gained in the LHC tunnel. The parameters
measured at ambient temperature such as the dielectric insulation and the impedance transfer function of assembled
circuits will be discussed. Some examples of detected polarity errors and the treatment of non-conformities will be
presented.
Fault Detection and Identification Methods Used for the LHC Cryomagnets and Related
Cabling
Several non-standard methods for electrical
fault location have been successfully developed
and tested. As part of the electrical
quality assurance program, certain wires
D. Bozzini, F. Caspers, V. Chareyre, Y. Duse, T. Kroyer, R. Lopez,
A. Poncet, S. Russenschuck (CERN)
have to be subjected to a (high) DC voltage for the testing of the insulation. With the time difference of spark-induced
electromagnetic signals measured with an oscilloscope, fault localization within a ± 10 cm range has been achieved.
Another method used and adapted for the particular needs, was the synthetic pulse time-domain reflectometry (TDR)
by means of a vector network analyzer. This instrument has also been applied as a low frequency sweep impedance
analyzer in order to measure fractional capacities of cable assemblies where TDR was not applicable.
Performance of LHC Main Dipoles for Beam Operation
At present about 75% of the main dipoles for
the LHC have been manufactured and one of
the three cold mass assemblers has already
completed the production. More than two
third of the 1232 dipoles needed for the tunnel
have been tested and accepted. In this
paper we mainly deal with the performance
results: the quench behavior, the magnetic
G. De Rijk, M. Bajko, L. Bottura, M.C.L. Buzio, V. Chohan, L.
Deniau, P. Fessia, J. Garcia Perez, P. Hagen, J.-P. Koutchouk, J. Kozak,
J. Miles, M. Missiaen, M. Modena, P. Pugnat, V. Remondino, L.
Rossi, S. Sanfilippo, F. Savary, A.P. Siemko, N. Smirnov, A. Stafiniak,
E. Todesco, D. Tommasini, J. Vlogaert, C. Vollinger, L. Walckiers,
E.Y. Wildner (CERN)
field quality, the electrical integrity quality and the geometry features will be summarized. The variations in performance
associated with different cold mass assemblers and superconducting cable origins will be discussed.
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