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Published byNicholas Shandy
Modified over 4 years ago
RFQ Structural Mods Scott Lawrie
Vacuum Pump Flange Vacuum Flange Coolant Manifold Cooling Pockets Milled Into Vanes Potentially Bolted Together Tuner & Coupler Ports Vanes
Increased Pumping Area Original design: Twelve 12mm wide slots Pumping area = 7045 mm 2 Modified design: Four 25mm wide slots Pumping area = 9749 mm 2 (43% greater)
Simulation Bodies 25mm 12mm Section of pump’s debris-catching grill Inter-vane vacuum Bulk quadrant vacuum Pumping slot vacuum
Magnetic Field Results B-field plot path
≈1W total heat ≈10mW total heat Turbo-pump grill position B-field along plot path
Because B-field is not uniform, neither is heat load. Therefore 1W is an over-estimate, but let’s not push it! Magnetic Field Across Grill Assume 1mm pitch, square wire grill
Frequency varies with RFQ length Mode Frequency / MHz Resonant Frequency: Superfish
Present geometry Q = 12463 Shunt Impedance = 2830 MΩ/m Power/Quadrant/cm = 186 W
Increased quadrant radius to bring on tune Q = 12749 Shunt Impedance = 3022 MΩ/m Power/Quadrant/cm = 174 W
Reduced quadrant radius but increased vane width Q = 11504 Shunt Impedance = 2308 MΩ/m Power/Quadrant/cm = 228 W
20mm wide vanes allow: 1.More material, so greater thermal conductivity and strength 2.Easier to machine straight edges 3.More room for cooling pocket penetration toward vane tip
RFQ development for high power beams
S. N. HOM Impedance in Vacuum … 1 of 40 Sasha Novokhatski SLAC, Stanford University Machine-Detector Interface Joint Session April 22, 2005 HOM Impedance.
The Front End Test Stand Collaboration ELECTROMAGNETIC DESIGN OF A RFQ FOR THE FRONT END TEST STAND AT RAL A. Kurup, A. Letchford The RAL front end test.
RFQ Matcher. What am I doing this time?! Concerned that modulations and matcher affect field flatness and frequency These are very small features How.
Effect of RFQ Modulations on Frequency and Field Flatness
RFQ End Flange Dipole Tuner Finger Cooling. Basis of Study Need multi-purpose end flange –Adjustable dipole mode suppression fingers –Beam current transformer.
Electricity and Magnetism
Chapter 30. Induction and Inductance
MICE RF and Coupling Coil Module Outstanding Issues Steve Virostek Lawrence Berkeley National Laboratory MICE Collaboration Meeting October 26, 2004.
Laboratori Nazionali di Legnaro (Italy) DTL design status A. Pisent.
CFD Simulations of a Novel “Squirt-Nozzle and Water Bath” Cooling System for the RFQ.
EMMA Cavity Update Emma Wooldridge 27/02/07. Requirements Initial Design Cavity Options & Optimisation Available Designs Future Work.
Current and Resistance JH
Longitudinal Expansion of RFQ Vane Ends at Section-to-Section Interface.
MICE RF Cavity Design and Fabrication Update Steve Virostek Lawrence Berkeley National Laboratory MICE Collaboration Meeting October 27, 2004.
Modifications Required on Model Before Meshing & Solving Slice up to define mesh in different areas –Transversely separate vane-tip region (about 16x16mm.
Integration of Cavities and Coupling Coil Modules Steve Virostek Lawrence Berkeley National Laboratory MICE Collaboration Meeting March 28 – April 1, 2004.
MICE RF Cavity Measurements Derun Li Center for Beam Physics Lawrence Berkeley National Laboratory March 26, 2010 University of California, Riverside,
Status of the 201 MHz Cavity and Coupling Coil Module Steve Virostek Lawrence Berkeley National Laboratory MICE Video Conference March 10, 2004.
Safety Review: RF Issues Derun Li Absorber Safety Review December 9-10, 2003 Lawrence Berkeley National Laboratory Berkeley, CA
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