New corrector system for the Fermilab booster Page: 3 of 3
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In the case of the quadrupoles, we will now have
individual ramped control of all elements; however, we do
not yet have an algorithm to take full advantage of this.
For that reason, we will group the modules in fours sets of
24, as they are now (long normal, long skew, short
normal, and short skew), and a common ramp to all of the
correctors in each set. Each element will also have an
individual DC offset programmed according to harmonic
weighting, or set of harmonic weightings. This will be
implemented via the C473 module in a manner which
emulates the current hardware configuration.
The existing limited sextupole system will be left in
place, so that we can initially operate in the same mode
that we do now. As we bring the new sextupoles into use,
we will initially control them in exactly the same way we
control the quadrupoles; namely, the time dependent
portion will be controlled in four groups, while each
element will have an individual DC offset determined by
harmonic correction, utilizing the algorithm described in
It will be challenging to take advantage of all of the
capabilities of the new corrector system. New modes of
operation will be adiabatically introduced to minimize the
disruption of normal operation. Clearly, the full potential
of the system will only be realized after all of the
corrector packages are installed.
The new corrector system will have enough strength to
fully control the beam position throughout the
acceleration cycle. An application is being developed
which will compare the beam orbit, as measured with the
BPM system, to a "desired orbit", and calculate the
necessary trim values to reproduce this orbit as a function
of time in the acceleration cycle. This application is being
commissioned with the existing corrector system, and
should be ready for use very quickly after the new
corrector system is operational.
The new quadrupole system will be capable of
controlling the tune throughout the cycle. This could
potentially enable a feed-forward application to measure
the tune on one cycle, and calculate the corrector values to
correct to the desired tune on subsequent cycles.
In addition, because quadrupole elements will have
individual ramped control, it will be possible to evolve the
harmonic corrections during the acceleration cycle, in a
manner which is not possible at the moment. The details
of this correction and its operational interface are still in
the conceptual stage.
The sextupoles of the new system will have roughly the
same integrated strength as the existing system, and the
chromaticity will likely be controlled in much the same
way it is now.
As stated in the previous section, the complete
sextupole coverage will allow arbitrary harmonic
correction, just as with the quadrupole system. As with
the quadrupole system, we foresee using the individual
ramped control to evolve the harmonic correction through
the acceleration cycle. The control interface should be a
straightforward extension of what is implemented for the
The new corrector system which will soon be
implemented in the Fermilab Booster will represent a
significant improvement, even when operated in a mode
which emulates the current system. The development of
applications to fully exploit the capabilities of the new
system will present an ongoing challenge over the next
 E. L. Hubbard, et al, "Booster Synchrotron",
FERMILAB-TM-405 (1973). See also:
B. Worthel, "Booster Rookie Book", Fermilab
 E.J. Prebys, et al., "Booster Corrector System
Specification", Fermilab Beams-doc-1881-v5, (2006)
 V.S. Kashikhin, et al., "A New Correction Magnet
Package for the Fermilab Booster Synchrotron,"
PAC'05, May 2005
 D.J. Harding, et al, "Design and Fabrication of a
Multi-element Corrector Magnet for the Fermilab
Booster", MOPAS006, PAC '07 (2007)
 G. Velev, et al, "Using a Slowly Rotating Coil System
for AC Field Measurements of Fermilab Booster
Correctors", MOPASO21, PAC '07 (2007)
 C. Drennan, et al., "System Overview for the Multi-
Element Corrector Magnets and Controls for the
Fermilab Booster", MOPAS005, PAC '07 (2007)
 D. McArthur, "CAMAC 473 Quad Ramp Controller
Rev. 2.0", Fermilab BEAMS-DOC-2361-V3
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Prebys, E.J.; Drennan, C.C.; Harding, D.J.; Kashikhin, V.; Lackey, J.R.; Makarov, A. et al. New corrector system for the Fermilab booster, article, June 1, 2007; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc884567/m1/3/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.