Transcript Folie 1 - IPN Orsay

LINAC AG •
IAP •
Goethe Universität Frankfurt
Challenges, Progress and Plans of SRF CH-Structures
Holger J. Podlech
Institute for Applied Physics (IAP)
University of Frankfurt
TTC Meeting
Jefferson Lab
November 5th-8th 2012
H. Podlech, IAP
LINAC AG •
IAP •
Goethe Universität Frankfurt
CH-Structures
• Crossbar H-Mode-Structure
• H211-Mode
• Efficient DTL-structures for the low and
medium energy range
• KONUS or EQUUS Layout
H. Podlech, IAP
LINAC AG •
IAP •
Goethe Universität Frankfurt
First CH-Prototype
f=360 MHz
b=0.1
H. Podlech, IAP
Ueff=5.5 MV
LINAC AG •
H. Podlech, IAP
IAP •
Goethe Universität Frankfurt
LINAC AG •
IAP •
Goethe Universität Frankfurt
Forwarded
Horizontal Test
Piezo signal
Pick-up
H. Podlech, IAP
LINAC AG •
IAP •
Goethe Universität Frankfurt
Learning Lessons From the First Prototype
Little space between stems for
tuner and power coupler
 change orientation
Poor preparation possibilities
(only on-axis)  new cleaning
flanges
H. Podlech, IAP
New dynamic tuner without
additional longitudinal space
requirements
Long end cells for field
enhancement (additional drift)
 sloped end stems
LINAC AG •
IAP •
Goethe Universität Frankfurt
325 MHz CH-Cavity
Bellow Tuner
b
0.1545
Frequency (MHz)
325.224
Cells
7
Length bl-def (mm)
505
Diameter (mm)
348
Ea (MV/m)
5
Ep/Ea
5.1
Bp/Ea [mT/(MV/m)]
13
G (W)
64
Ra/Q0 (W)
1248
RaRs (W2)
80000
Helium Vessel
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Static Tuners
Power Coupler
LINAC AG •
IAP •
Goethe Universität Frankfurt
325 MHz CH-Prototype
H. Podlech, IAP
LINAC AG •
IAP •
Goethe Universität Frankfurt
Optimization of the Geometry of Superconducting CH-Cavities
Cost, Construction Time, Fabrication Inaccuracies
Arrived in Frankfurt
October 31st
H. Podlech, IAP
LINAC AG •
IAP •
Goethe Universität Frankfurt
325 MHz CH-Cavity: First Measurements
H. Podlech, IAP
LINAC AG •
IAP •
Goethe Universität Frankfurt
325 MHz Cavity: Static Tuners
Design Position
Deviation from Design frequency:
500 kHz < 0.2%
H. Podlech, IAP
LINAC AG •
IAP •
Goethe Universität Frankfurt
Strategy to Hit the Operation Frequency
• Fabrication inaccuracy (Δf = 0.5 MHz)
• End cell offset 10 mm (Δf ≈ ±1 MHz)
• Thermal shrinkage (Δf ≈ +400 kHz)
• Static tuners (Δf ≈ +1.3 MHz, -2.2 MHz)
• Pressure sensitivity (Δf ≈ +200 kHz)
• Surface preparation (Δf = 6 kHz/mm)
• Surface preparation (Δf = 6 kHz/mm)
• Slow bellow tuners (Δf ≈ ±250 kHz)
• Microphonics (Δf = ? Hz)
• Fast bellow tuner (Δf ≈ ± 1000 Hz)
• Lorentz Force Detuning (Δf = ? Hz)
H. Podlech, IAP
LINAC AG •
IAP •
Goethe Universität Frankfurt
The MYRRHA Project
Multi Purpose HYbrid Research Reactor for High Tech Applications
H. Podlech, IAP
LINAC AG •
IAP •
Goethe Universität Frankfurt
The 17 MeV MYRRHA Injector
sc CH-2
Parameter
Unit
Value
Frequency
MHz
176.1
Cells
---
7-10
L tot
mm
920-1130
Ueff
MV
3.5-4.1
Ea
MV/m
3.5-3.9
R/Q
W
1600-2200
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sc CH-1
sc CH-3
sc CH-4
LINAC AG •
IAP •
Goethe Universität Frankfurt
Future GSI/FAIR Injector Complex
Parameter
Unit
Mass/ Charge
H. Podlech, IAP
6
Frequency
MHz
216.816
Max. beam current
mA
1
Injection energy
AMeV
1.4
Output energy
AMeV
3.5 – 7.5
Output energy spread
AkeV
±3
Length of acceleration
m
12.7
Sc CH-cavities
9
Sc solenoids
7
LINAC AG •
IAP •
Goethe Universität Frankfurt
cw SHE-Linac Demonstrator
Parameter
Unit
Beta
Frequency
0.059
MHz
Gap number
Tuner flange
Helium vessel
15
mm
687
Cavity diameter
mm
409
Cell length
mm
40.82
Aperture
mm
20
Ua
MV
3.369
Energy gain
MeV
2.97
MV/ m
5.1
Ep/ Ea
Bp/ Ea
R/ Q
Inclined
end stem
Pickup flange
Coupler flange
H. Podlech, IAP
216.816
Total length
Accelerating gradient
Preparation
flange
CH-1
6.4
mT/ (MV/m)
5.4
Ω
3320
Static tuner
9
Dynamic bellow tuner
3
LINAC AG •
IAP •
Goethe Universität Frankfurt
Cryo Module cw SHE-Linac Demonstrator
H. Podlech, IAP
LINAC AG •
IAP •
Goethe Universität Frankfurt
Setup for Beam Tests at GSI
217 MHz Demonstrator
108.4 MHz RFQ
108.4 MHz IH-Cavity
H. Podlech, IAP
LINAC AG •
IAP •
Goethe Universität Frankfurt
Thank you
H. Podlech, IAP