LINAC AG • IAP • Goethe Universität Frankfurt H. Podlech, IAP LINAC AG • IAP • Goethe Universität Frankfurt H. Podlech, IAP Challenges, Progress and Plans of SRF CH- Structures Holger J. Podlech Institute for Applied Physics (IAP) University of Frankfurt TTC Meeting Jefferson Lab November 5 th -8 th 2012
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Challenges , Progress and P lans of SRF CH- Structures
Challenges , Progress and P lans of SRF CH- Structures. Holger J. Podlech Institute for Applied Physics (IAP) University of Frankfurt TTC Meeting Jefferson Lab November 5 th -8 th 2012. CH-Structures. C rossbar H -Mode- Structure H 211 -Mode - PowerPoint PPT Presentation
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LINAC AG • IAP • Goethe Universität Frankfurt
H. Podlech, IAP
LINAC AG • IAP • Goethe Universität Frankfurt
H. Podlech, IAP
Challenges, Progress and Plans of SRF CH-Structures
Holger J. Podlech
Institute for Applied Physics (IAP)
University of Frankfurt
TTC MeetingJefferson Lab
November 5th-8th 2012
LINAC AG • IAP • Goethe Universität Frankfurt
H. Podlech, IAP
CH-Structures
• Crossbar H-Mode-Structure
• H211-Mode
• Efficient DTL-structures for the low and medium energy range
• KONUS or EQUUS Layout
LINAC AG • IAP • Goethe Universität Frankfurt
H. Podlech, IAP
f=360 MHzb=0.1 Ueff=5.5 MV
First CH-Prototype
LINAC AG • IAP • Goethe Universität Frankfurt
H. Podlech, IAP
LINAC AG • IAP • Goethe Universität Frankfurt
H. Podlech, IAP
Horizontal Test
Pick-up
Forwarded
Piezo signal
LINAC AG • IAP • Goethe Universität Frankfurt
H. Podlech, IAP
LINAC AG • IAP • Goethe Universität Frankfurt
H. Podlech, IAP
Learning Lessons From the First Prototype
Poor preparation possibilities (only on-axis) new cleaning flanges Long end cells for field
enhancement (additional drift) sloped end stems
Little space between stems for tuner and power coupler change orientation
New dynamic tuner without additional longitudinal space requirements
LINAC AG • IAP • Goethe Universität Frankfurt
H. Podlech, IAP
LINAC AG • IAP • Goethe Universität Frankfurt
H. Podlech, IAP
Bellow Tuner Static Tuners
Helium VesselPower Coupler
325 MHz CH-Cavity
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
LINAC AG • IAP • Goethe Universität Frankfurt
H. Podlech, IAP
325 MHz CH-Prototype
LINAC AG • IAP • Goethe Universität Frankfurt
H. Podlech, IAP
LINAC AG • IAP • Goethe Universität Frankfurt
H. Podlech, IAP
Optimization of the Geometry of Superconducting CH-CavitiesCost, Construction Time, Fabrication Inaccuracies