Production measurements on the quadrupole correctors for the new Low- Beta System for the Tevatron Collider Page: 4 of 4
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T3K0Q2. HARMONIC COEFFICIENTS AT 4200 A
/CdL (S5 and 717 Colls)
HARMONIC NUMBER (a)
Figure 5: Harmonic moments of 717 coils
TSJ002, NORMAL 12-POLE
Figure 6: Current hysteresis of 12-pole moment
post was introducing some heat into the magnet produc-
ing a bubble of warm gas in the upper portion of the coil.
Leaving the magnet cold for a longer period of time would
shrink this pocket of warm gas, as it happened during the
fist cool down. Increasing the pressure would also raise the
liquid level further up inside the cryostat causing a more
uniform temperature distribution throughout the coil. It
was, thus, concluded that the quench behaviour after the
thermal cycle was actually a cooling curve and not a train-
ing one. Other magnets exhibited similar behaviour con-
firming the above hypothesis.
The magnetic field measurements on the S5 and 717 coils
were done with the system used for the testing of all the
Tevatron magnets . The harmonic content of the field is
measured with a rotating coil, and a stretched wire mea-
surement is used to find the magnetic center and measure
the integrated gradient and the field angle. Figure 5 shows
the harmonic coefficients for a 717 coil as measured with
the rotating coil. Both S5 and 717 coils have a large 12-
pole moment built into them. Figure 6 shows the current
hysteresis in the 12-pole moments as a function of current
for a 717 coil.
The integrated gradient is measured with a stretched
wire probe described in . Figure 7 shows the measured
J GdL for the S5 and 717 coils. For detailed discussion of
7 IT Coili (*4000 A)
3S Coil* (•I00C A)
Figure 7: J GdL for S5 and 717 coils
magnetic performance of these quadripoles see Ref. .
 A. D. MclnturfF et al.,“The Fermilab Collider DO
Low 0 system,” FERMILAB-Conf-88/72.
 M. Johnson et al.,“Electrical and Magnetic Proper-
ties of the Energy Saver Correction Elements,” In-
ternational Accelerator Conference, Fermilab, 1983
 S. A. Gouilay et al., “Quench Performance of Super-
conducting Quadrupole Magnets for the New Feimi-
lab Low Beta Insertion,” These Proceedings.
 P. M. Mantsch et al., “Fabrication and Performance
of a New High Gradient Trim Quadrupole for the
Fermilab Luminosity Upgrade,” These Proceedings.
 Q. A. Kerns et al.,“An R.F. Device for Precision Lo-
cation of the Beam Position Detectors in the Energy
Saver,” IEEE Transactions on Nuclear Science, Vol.
NS-30,No. 4, August 1983.
 J. Strait et al.,“Fermilab R&D Test Facility for SSC
Magnets,” Presented at the 1989 International In-
dustrial Symposium on the Super Collider, New Or-
leans, LA, Feb. 8-10, 1989 (Fermilab preprint TM-
 B. C. Brown et al.,“Report on the Production Mag-
net Measurement System for the Fermilab Energy
Saver Superconducting Dipole and Quadrupole,”
"Fermilab preprint TM-1181,1983.
 R. Hanft et al., “Magnetic Performance of New Fer-
milab High Gradient Quadrupoles,” These Proceed-
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Mokhtarani, A.; Brown, B.C.; Hanft, R.; Oleck, A.R.; Peterson, T. & Turkot, F. Production measurements on the quadrupole correctors for the new Low- Beta System for the Tevatron Collider, article, May 1, 1991; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1092979/m1/4/: accessed March 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.