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Industrial Harmonic
Analysis
System
for
Magnetic
Measurements
of
SSC
Collider
Arc
and
High
Energy Booster
Corrector Magnets
Superconducting Super Collider
Laboratory
SSCL-Preprint-471
May
1993
Distribution Category:
400
M.
Green
R.
Sponsel
C.
Sylvester
P
Disclaimer
Notice
This report was prepared
as
an account
of
work sponsored by an agency of the United States
Government. Neither the United States Government or any agency thereof, nor any
of
their
employees, makes any warranty, express or implied,
or
assumes any legal liability or responsibility
for the accuracy, completeness. or usefulness
of
any information, apparatus, product, or process
disclosed, or represents that
its
use would
not
infringe privately owned rights. Reference herein to
any specific commercial product, process. or seMce by trade name, trademark. manufacturer, or
otherwise,
does
not necessarily constitute or imply its endorsement. recommendation. or favoring
by the United States Government or any agency thereof. The views and opinions of authors
expressed herein do not necessarily state or reflect those of the United States Government or any
agency thereof.
I
Superconducting Super Collider Laboratory is an equal opportunity employer.
DISCLAIMER
Portions
of
this
document may
be
illegible
in
electronic image products. Images are
produced from
the
best
available
original
document.
I
--
I.
To
be published in
SupercoZZider
5
SSCL-Preprint-47
1
Industrial Harmonic Analysis System for Magnetic Measurements
of SSC Collider Arc and
High
Energy Booster Corrector Magnets"
M.
Green,
R.
Sponsel, and
C.
Sylvester
Superconducting Super Collider Laboratory?
2550
Beckleymeade Ave.
Dallas,
TX
75237
May 1993
*Presented at
the
Fifth Annual International Symposium on the Super Collider, May 6-8,1993
San
Francisco, CA.
+Operated by the Universities Research Association, Inc., for the U.S. Department
of
Energy under Contract
NO.
DE-AC35-89ER40486.
INDUSTRIAL HARMONIC ANALYSIS SYSTEM FOR MAGNETIC
MEASUREMENTS OF SSC COLLIDER ARC
AND
HIGH ENERGY BOOSTER
CORRECTOR MAGNETS
M.
I.
Green,
R.
Sponsel, and
C.
Sylvester
Superconducting Super Collider Laboratory*
2550 Beckleymeade Ave.
Dallas, TX 75237-3997
INTRODUCTION
The SSCL collider arc and high energy booster corrector magnets are 50
mm
bore
cryogenic magnets. The integral strength and harmonics will be measured by industry at
full current at
4.2
K
and at plus and minus
400
mA
at room temperature. Dipoles, quad-
rupoles, and sextupoles have error tolerances of a few tens of units. A prototype harmonic
analysis system for magnetic measurements
of
production and prototype dipole, quadrupole
and sextupole magnets has been designed and is being fabricated. We describe the criteria
for search coil designs, data acquisition system hardware and software. Radial search coil
arrays
are
being fabricated utilizing multifilarl wire. Two digital integrators will allow
simultaneous accumulation of unbucked and bucked configurations.
DESCRIPTION
OF
MAGNET MEASUREMENT REQUIREMENTS
Field strength and harmonics
of
dipole, quadrupole, sextupole, octupole and decapole
corrector magnets need to measured. The bore is
50
mm
and magnet lengths
vary
from
about
0.2
to 1.6 meters. The required field quality of the error harmonics is 10 to 30 units.
A
unit is defined as
10-4
of
the fundamental field evaluated at a reference radius
of
1
cm.
The system resolution will be better than
1
unit.
INSTRUMENTATION
Figure 1 is a block diagram
of
the instrumentation. The voltage from rotating radial
coil arrays
is
fed to digital integrators which are latched by an incremental optical encoder.
Using integrators rather than reading the voltage directly eliminates the need to correct the
coil voltages for rotational speed variations.
*
Operated
by
the
Universities Research Association, Inc., for the
U.
S.
Department
of
Energy under Contract
NO.
DE-AC35-89ER40486.