configuration Example on the SMC11T3 H BAJAS et Al Hugo Bajas WP5 coordination meeting 28 07112017 1 WP5 coordination meeting 28 927 07112017 AC loss issue Hugo Bajas WP5 coordination meeting 28 07112017 ID: 787840
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Slide1
AC loss measurement in racetrack coil configuration Example on the SMC11T-3
H. BAJAS et. Al.
Hugo Bajas, WP5 coordination meeting 28, 07-11-2017
1
WP5 coordination meeting 28 - 927-
07-11-2017
Slide2AC loss issueHugo Bajas, WP5 coordination meeting 28, 07-11-2017
2
Measurement issues
The AC losses are delicate measurements as one has to detect
Joules
over
hundreds of kJ
.
It requires
High Resolution/precision Digital
MultiMeters
(DMM 1
uV
± 0.01%).
Measurement
requires
to perform a great number of cycles at different ramp rate and level of current
.
Those are time-consuming measurements that are not systematically done.
Data analysis issues
The way
the current cycle and the voltage offset are defined is of primary importance
as the computation are very sensitive (± 20% on final value).
Need a performant framework for
automatic analysis
over 10
th
of file, 100
th
of cycle, 10
th
of voltages.
Number
of magnets have been measured looking at the total and partial loss
.
Slide3ReferencesHugo Bajas, WP5 coordination meeting 28, 07-11-2017
3
Slide4Measurement ProcedureHugo Bajas, WP5 coordination meeting 28, 07-11-2017
4
Current
cycle
between
two
level
of
current
@
different
ramp
rates
Importance of the cycle and offset definition!!
Slide5Measurement ProcedureHugo Bajas, WP5 coordination meeting 28, 07-11-2017
5
Current
cycle
between
two
level
of
current
@
different
ramp
rates
Importance of the cycle and offset definition!!
Slide6Measurement Procedure
Hugo Bajas, WP5 coordination meeting 28, 07-11-2017
6
E=
Loss/cycle
=
Slide7Measurement ProcedureHugo Bajas, WP5 coordination meeting 28, 07-11-2017
7
Slide8Loss measurement resultsHugo Bajas, WP5 coordination meeting 28, 07-11-2017
8
AC
loss
as
function
of the
ramp
rate
AC
loss
as
function
of the
current
Slide9On-going workHugo Bajas, WP5 coordination meeting 28, 07-11-2017
9
Result
for RMC_QXF
Slide10On-going workHugo Bajas, WP5 coordination meeting 28, 07-11-2017
10
Result
for
MQXFS-5 (
current
between
200A - 50
%
I
nom
& 50 % -
I
nom
)
Slide11DiscussionHugo Bajas, WP5 coordination meeting 28, 07-11-2017
11
A new framework of analysis is now available following literature procedure.
A large number of files (including old file with different format) can now be treated massively.
The goal is to study the impact of the plateau, offset and drift
definition and the variation between half coils, segments and splice (10%)
A
method
to
measure
Nb3Sn
AC
loss
is
now
implemented
at SM18 to
be
used for the coming
Nb3Sn magnets.Analysis still in progress…
Slide12Hugo Bajas, WP5 coordination meeting 28, 07-11-2017
12
Slide13Data Analysis ProcedureHugo Bajas, WP5 coordination meeting 28, 07-11-2017
13
Slide14Measurement ProcedureHugo Bajas, WP5 coordination meeting 28, 07-11-2017
14
Slide15Hugo Bajas,MT25, Aug. 201715