Sievers - Overview of the latest SRF projects at the S-DALINAC
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Transcript of Sievers - Overview of the latest SRF projects at the S-DALINAC
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Overview of the latest SRF projects at the S-DALINAC*
Sven Sievers
TU DarmstadtInstitut für Kernphysik SFB 634
*Supported
by
the
DFG through
SFB 634
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04. Oktober 2010 | TU Darmstadt | Institut für Kernphysik | Sven Sievers
Outline
•
Overview
of the
S-DALINAC
•
SRF at the
S-DALINAC
•
Vertical
bath
cryostat
•
Latest
measurements•
Piezo-Actor
•
Oscillating
Superleak
Transducers
•
Test in preparation•
RF power couplers
•
Outlook
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04. Oktober 2010 | TU Darmstadt | Institut für Kernphysik | Sven Sievers
Overview of the S-DALINAC
Design values:
Max. energy:
130 MeVEnergy spread:
±10-4
Max. beam
current:
60 µADuty
cycle:
cw
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04. Oktober 2010 | TU Darmstadt | Institut für Kernphysik | Sven Sievers
Overview of the S-DALINAC
![Page 5: Sievers - Overview of the latest SRF projects at the S-DALINAC](https://reader033.fdocuments.us/reader033/viewer/2022052505/555bf07cd8b42a56448b4605/html5/thumbnails/5.jpg)
04. Oktober 2010 | TU Darmstadt | Institut für Kernphysik | Sven Sievers
Overview of the S-DALINAC
![Page 6: Sievers - Overview of the latest SRF projects at the S-DALINAC](https://reader033.fdocuments.us/reader033/viewer/2022052505/555bf07cd8b42a56448b4605/html5/thumbnails/6.jpg)
04. Oktober 2010 | TU Darmstadt | Institut für Kernphysik | Sven Sievers04. Oktober 2010 | TU Darmstadt | Institut für Kernphysik | Sven Sievers
SRF at the S-DALINAC
Material:
Frequency:
Mode:
Temperature:
Niob (RRR=300)
2.9975 GHz
TM010
,π
2 K
Length:
Eacc
:
Q0
:
Pdis
:
1 m
5 MV/m
3·109
4.2 W
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04. Oktober 2010 | TU Darmstadt | Institut für Kernphysik | Sven Sievers
Vertical bath cryostat
Diameter:
35 cmDepth:
260 cm
Minimum required
LHe-level: 150 cmMaximum LHe-level:
190 cm
D = 35 cm
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04. Oktober 2010 | TU Darmstadt | Institut für Kernphysik | Sven Sievers
Vertical bath cryostat
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04. Oktober 2010 | TU Darmstadt | Institut für Kernphysik | Sven Sievers
Vertical bath cryostat
Operation characteristics•
Cooldown
300 K → 4 K
~ 1.5 h
•
Fill-up
to maximum
LHe
level
~ 2 h
•
Pump down to 35 mbar
/ 2 K
~ 2.5 h
•
Stand-by
losses
of cryostat
< 1 W
Current limitations•
No pressure
regulation
→ 35 mbar
kept
via cryostat
heating
•
Operation of vertical
cryostat
not
possible
while
linac
is
at 2 K→ Measurements
limited
to shut
downs
of the
S-DALINAC
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04. Oktober 2010 | TU Darmstadt | Institut für Kernphysik | Sven Sievers
First measurements: Piezo Actor
Investigation of the
stroke
of a piezo-actor
@ 2 K to replace
magnetostricitive
elements
of fine tuning
system
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04. Oktober 2010 | TU Darmstadt | Institut für Kernphysik | Sven Sievers
First measurements: Piezo Actor
Existing
tuning
system: Fine tuning
of cavity
with
magnetostrictive
elements
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First measurements: Piezo Actor
Required
frequency
shift:1000 Hz
Resulting
cavity
deformation:2 µm
Required
stroke
of fine tuner:5 µm
04. Oktober 2010 | TU Darmstadt | Institut für Kernphysik | Sven Sievers
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04. Oktober 2010 | TU Darmstadt | Institut für Kernphysik | Sven Sievers
First measurements: Piezo Actor
Required
stroke
of fine tuner:
5 µm
Stroke
of piezo-actor
@ 300 K:
90 µmPredicted
stroke
@ 4 K*: 22.5 µm
Measurement
with
simplified
tuner
set-up
Measured
frequency
shift
@ 4 K in LHe:
~ 1100 HzResulting
stroke
of piezo-actor:
~ 5.5 µm
Measured
frequency
shift
@ 2 K in LHe:
~ 950 HzResulting
stroke
of piezo-actor:
~ 4,75 µm
*B. Sahu, G. Chowdhury, S. Ghosh, D. Kanjilal, D. Mathuria, R. Mehta, A. Pandey, P. Patra, A. Rai
and A. Roy: Use
of Piezo
Actuator
to Frequency
and Phase Lock a Superconducting
Quarter
Wave Resonator, Proc. of the
24th Linear Accelerator Conference
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04. Oktober 2010 | TU Darmstadt | Institut für Kernphysik | Sven Sievers
First measurements: Piezo Actor
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04. Oktober 2010 | TU Darmstadt | Institut für Kernphysik | Sven Sievers
First measurements: OSTs
Performance check of the
prototypes
of anOscillating
Superleak
Transducer
(OST)
for
quench
localisation
@ 2 K
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04. Oktober 2010 | TU Darmstadt | Institut für Kernphysik | Sven Sievers
First measurements: OSTs
OSTs shall be used for thedetection
of quench
positions
of superconducting
cavities
The
quench
causes
a 2nd soundwave
in the
superfluid
LHe
that
can
be
detected
by
the
OSTs
The
location
of the
quench
isdetermined
by
triangulation
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04. Oktober 2010 | TU Darmstadt | Institut für Kernphysik | Sven Sievers
First measurements: OSTs
R –
Moment of the
heat
pulse1 –
Response of the
1st OST after
~ 2 ms
2 –
Response of the
2nd OST after
~ 4 ms
R
2
1
R 1 2
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Test in preparation: RF power couplers
Characterisation
of new
power couplers
for
the
injector
upgrade
04. Oktober 2010 | TU Darmstadt | Institut für Kernphysik | Sven Sievers
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04. Oktober 2010 | TU Darmstadt | Institut für Kernphysik | Sven Sievers
Test in preparation: RF power couplers
Planed injector upgrade
•
Energy increase
in the
injectorsection
from
10 up to 14 MeV
•
Increase
in current
from60 μA to 150 –
250 μA
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04. Oktober 2010 | TU Darmstadt | Institut für Kernphysik | Sven Sievers
Test in preparation: RF power couplers
Actual
power coupler: 500 W Qex = 3·106 - 1·1010
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04. Oktober 2010 | TU Darmstadt | Institut für Kernphysik | Sven Sievers
RF power couplers
transition
transition
beam
transfer
Design: TEMF
Fabrication: FZ Julich
M. Kunze, W. F. O. Müller
Actual
power coupler:
500 W Qex = 3·106 - 1·1010
Waveguide
coupler: 2 kW Qex = 5·106
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04. Oktober 2010 | TU Darmstadt | Institut für Kernphysik | Sven Sievers
Outlook
•
Construction of Quench-Detection-Array
•
Development
of optical
inspection
setup
•
Further
investigations
of piezo-actors
•
Design of new
equipment
for
the
vertical
bath
cryostat(Bacholer/Master
thesises):
•
Measurement
of Q-value
via decay
time•
Design and construction
of T-Map-System
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04. Oktober 2010 | TU Darmstadt | Institut für Kernphysik | Sven Sievers
Thank you for your attention
Institut für Kernphysik, TU Darmstadt
S. Sievers, U. Bonnes, J. Conrad, R. Eichhorn, F. Hug, M. Konrad,T. Kürzeder, N. Pietralla, A. Richter
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04. Oktober 2010 | TU Darmstadt | Institut für Kernphysik | Sven Sievers
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04. Oktober 2010 | TU Darmstadt | Institut für Kernphysik | Sven Sievers
Closed loop for liquid Helium