RFQ – Design, Components and Fabrication 1 We aim to design and manufacture a Radio Frequency Quadrupole (RFQ).

RFQ – Design, Components and Fabrication 2 Who might be doing what? RALThe experts Peter SavageMechanical Design Ajit Karup Physics Design Mech Eng DepartmentDetailed Analysis HEP / Central Workshop Manufacture

RFQ – Design, Components and Fabrication 3 The form of the design The RFQ design will be an iterative process: Physics Manufacture Engineering RAL

RFQ – Design, Components and Fabrication 4 What is the RFQ? A device to accelerate, focus and bunch a beam

RFQ – Design, Components and Fabrication 5 RFQ design The new RFQ design will be based upon the existing ISIS FETS RFQ design, built by RAL in 2000.

RFQ – Design, Components and Fabrication 6 What are the components of a RFQ? The RFQ is composed of four parts: 1.Base 2.Stems 3.Poles 4.Vessel

RFQ – Design, Components and Fabrication 7 The four RFQ components Base Vessel Poles Stems

RFQ – Design, Components and Fabrication 8

9 Poles mounted to stems

RFQ – Design, Components and Fabrication 10 Inverted RFQ

RFQ – Design, Components and Fabrication 11 Polishing

RFQ – Design, Components and Fabrication 12 RFQ mounted on the alignment bench

RFQ – Design, Components and Fabrication 13 ISIS RFQ

RFQ – Design, Components and Fabrication 14 How does the new RFQ differ to the existing ISIS RFQ? 1) Needs to accelerate to a higher energy (665keV – 2500keV) 2) Will use a higher beam current (30mA – 60mA) 1) Operating at higher energy means: –Increased length (3 to 4 times) – design and manufacturing issues –Increased power dissipated in copper – thermal analysis 2) Using a higher beam current means: –New design for electrodes In addition the new RFQ is required to have improved accessibility and an improved cooling joint design.

RFQ – Design, Components and Fabrication 15 RFQ specifications ISIS RFQNew RFQ Total Length1190 mm≈ 4000 mm Diameter250 mm Beam Current30 mA60 mA Frequency202.5 MHzUndecided Q-value315150? Shunt Impedance53.5 kΏ? E in35 keV? E out665 keV2500 keV Weight≈ 80 kg≈ 320 kg MaterialOxygen Free Copper

RFQ – Design, Components and Fabrication 16 Engineering Challenges Manufacturing a 4 metre RFQ »Stress analysis »Handling, support, access Vacuum vessel with internal water cooling »Thermal modelling »Connectivity Building and Infrastructure »Shielding »Services

RFQ – Design, Components and Fabrication 17 Cooling water flow in the stems

RFQ – Design, Components and Fabrication 18 Stem showing cooling channel

RFQ – Design, Components and Fabrication 19 Thermal analysis of base, stems and poles

RFQ – Design, Components and Fabrication 20 Support Structure

RFQ – Design, Components and Fabrication 21 Alignment Bench

RFQ – Design, Components and Fabrication 22 The big picture The RFQ is one component of five that make up the Proton Driver FETS. The five components are: 1.Ion Source 2.Low Energy Beam Transport (LEBT) 3.RFQ 4.Beam Chopper 5.Diagnostics

RFQ – Design, Components and Fabrication 23 What supplies a working RFQ? Demineralised cooling water RF power Vacuum

RFQ – Design, Components and Fabrication 24 The ISIS FETS from above RFQ LEBT Diagnostics Ion Source Beam Direction

RFQ – Design, Components and Fabrication 25 ISIS RFQ 1000 l/s turbo pumps and gate valves RF power in – coaxial cable Tuner to maintain resonant frequency

RFQ – Design, Components and Fabrication 26 Where will the FETS be used? R8 hall at RAL

RFQ – Design, Components and Fabrication 27 Plan view of R8

RFQ – Design, Components and Fabrication 28 In conclusion We aim to design and manufacture a RFQ under the guidance of RAL. This project represents a significant academic challenge in both the Physics and Engineering. We wish to collaborate with the available areas of expertise within Imperial College.