Storage ring operation
status: performance
and evolutions
In 2013, the number of beamlines (BLs)
benefitting from the SOLEIL high flux
and high brilliance photon beams hit
a new record of 27. Among them three
BLs are now under commissioning
(NANOSCOPIUM, HERMES and ROCK).
Two additional beamlines are under heavy
construction (ANATOMIX and PUMA).
Five electron filling patterns are routinely
used during user operation; all of them
with Top-up injection and high beam
stability (see Table
➊
). Figure
➊
gives
their distribution during 2013.
The multibunch hybrid filling pattern
is overwhelmingly requested: 83.2 %
of the total number of shifts. The time
allocated to Low-Alpha operation has been
increased from 2.3 % in 2012 to 3.3 %
in 2013.
The statistics of the different quality
metrics of the operation are rather good
for the year 2013. First, the availability
of the photon beams for the beamlines
has reached 98 %, which corresponds
to a total of 4 912 hours out of the 5 015
scheduled hours. As shown in Figure
➋
,
electrical power drops are once again the
main source of beam interruption (29 %
of the total) with 18 beam trips. Even if
the latters were shorter than one second
long, there resulted in a total of 30 hours
of beam interruption. The second main
source of beam interruption (28 %) was
erratic and short transient current spikes
of a few quadrupole power supplies. This
problem occurred mainly during the first
week of the year, just after the Christmas
shutdown; nevertheless, besides
numerous investigations, the origin is not
yet fully understood. This led in turn to 21
hours of beam loss during the first week
of the year. Hopefully the rest of the year,
and particularly its end, was conversely
of exceptionally high beam quality. The
record for the longest user beam was
broken twice in a row during the last run
of the year as illustrated by Figure
➌
.
SOURCES AND ACCELERATORS DIVISION
Table
➊
:
FIVE DIFFERENT FILLING PATTERNS FOR SOLEIL USERS
Uniform (416 bunches)
430 m A
500 mA
Hybrid (312 + 1 bunches)
425 + 5 mA
420 + 10 mA
8 bunches
88 mA
110 mA
1 bunch
15 mA
20 mA
Hybrid Low-Alpha (bunch length, bunch current)
4.7 ps RMS,
3 ps RMS,
65 μA/bunch
15 μA/ bunch
2013
ULTIMATE
FILLING PATTERN
USER OPERATION PERFORMANCE ACHIEVED
➊
Distribution of the filling patterns delivered to users in 2013
134
SOLEIL
HIGHLIGHTS
2013
