Test results of TQS03: a LARP shell-based Nb3Sn quadrupole using 108/127 conductor Page: 4 of 13
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The measurements are multiplied by the number of strands in the cable and self-field corrected with a
value of 0.585 T/kA. Their average is fitted with the scaling law described in , assuming zero
strain in the strand. The 1.9 K Ic(B) curves are computed using the same scaling law based solely on
4.2 K data and fit parameters. At 4.2 K and 1.9 K, the intersection of the load line of the magnet and
the fit gives the magnet's short sample current. In the past, TQS short sample currents were computed
based on the fit of the lowest strand measurements - giving a slightly lower short sample current,
which explains discrepancies with previous papers, like .
The magnetic cross-section of the magnet is identical in all the TQS series (figure 3). The coils are
made of two layers wound around a Titanium Alloy pole. The inner layer is made of a 6 turn pole
block and a 12 turn mid-plane block separated by an Aluminum Bronze wedge. The outer layer is
made of a single block of 16 turns. The aperture of the magnet is 90 mm. From a magnetic point of
view, TQS03a/b and TQS02c are identical. The magnet parameters of TQS02c and the TQS03 series
are listed in table 2.
6 turn pole block
12 turn mid-plane block
16 turn outer layer block
Figure 3. TQS coil cross-section
Table 2. TQS02c and TQS03a/b parameters.
Units TQS02c TQS03a/b
Conductor type OST RRP 54/61 OST RRP 108/127
Short sample current Iss at 4.3 K / 1.9 K kA 13.9 / 15.4 13.2 / 14.5
Peak conductor field at 4.3 K / 1.9 K T 12.53 / 13.76 11.96 / 13.02
Short sample gradient at 4.3 K / 1.9 K T/m 243 / 269 234 / 254
Stored energy at 4.3 / 1.9 K kJ/m 480 / 590 433 / 522
Inductance mH/m 5 5
Horizontal Lorentz force at ISS (4.3 K) per quadrant MN/m 2.1 1.9
Vertical Lorentz force at ISS (4.3 K) per quadrant MN/m -2.2 -2
2.2. Mechanical design
As introduced earlier, the TQS structure is a shell-based structure and relies on bladder and key
technology to impart the preload to the coils -. The bladders, made of two thin sheets of stainless
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Felice, H.; Ambrosio, G.; Bajko, M.; Barzi, E.; Bordini, B.; Bossert, R. et al. Test results of TQS03: a LARP shell-based Nb3Sn quadrupole using 108/127 conductor, article, September 13, 2009; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc1014234/m1/4/: accessed February 18, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.