Neutrino Factory Workshop, IOP, 28th October 2003

RF Systems

David M Wilcox

Summary• Purpose• Who needs whom?• The RF System• Components of the RF system• Benefits• Questions

Purpose

• To ensure that UK industry becomes fully engaged in the UKNF project

• Increase the credibility of the UK as a site for the machine by creating a strong and expert manufacturing base

• To ensure that the UK benefits fully from the construction of the Neutrino Factory

• To encourage innovation by firing the enthusiasm and imagination of engineers

• To encourage technical networking between world class scientists and world class UK companies.

Who needs whom?

The UKNF project needs your• input of industrial know-how right from the start• routine contribution to reality and feasibility checks

The UK NF project represents to industry• a great technology driver in many subjects• an opportunity for large, medium and small companies• the chance to contribute manufacturing knowledge and

skills to a remarkable engineering endeavour

The RF systemAn RF system in this analysis includes:-• Everything from the isolator in the local 3-phase

supply up to and including the accelerating cavities.

• The interlocking and protection circuitry• The local control system and the provision of

control data to the central control system

RF System Cartoon

Connection to 3-phase supply

Standard high quality power distribution components

………..but must not be overlooked!!

AC to DC conversion and fast protection

•High efficiency

•Small size

•Low noise

•Good power factor

•Low stored energy

•Fast switch-off

Main RF Power Source

• Klystron• Gyro-device• Magnetron• IOT• Tetrode

Focus magnets

External cavity resonators

Piece part manufacture

RF driver and ancilliary power supplies

• RF driver – high stability, linear, narrow band 100W upwards

• Heater psu – low voltage medium DC current isolated to high voltage

• Ion pump psu – high impedance 5 kV 10 A3 kV 1.5 mA

• Magnet psu – low voltage medium current

RF output window and waveguide transition

RF window and output transitiondesigned as a matched unit• Specialised RF design

• Specialised ceramic manufacture

• Precision mechanical construction

Circulator and power measurement

• High power circulator

• Directional couplers

• Arc detectors

• High power RF load

Splitters and combiners

Type– ‘Magic T’– Wilkinson– Gysel– Resonant cavity

Operating environment– Short pulse > 50 MW, 5s, X-band– Long pulse > 10 MW, 2ms, L-band– CW > 1 MW, HF to L-band

RF cavities, RF windows and couplersRoom temperature RF cavities

• OFHC cavity construction• RF input couplers• Couplers for harmonic loading• High power RF windows

Superconducting RF cavities• Niobium or niobium coated OFHC • Semiconductor standards of cleanliness• High mechanical stability• Cryostat technology• RF input couplers with high thermal gradient• High power RF windows

Control system

• Fault monitoring and fast protection system

• Safety interlock system

• Power stabilisation via local feedback

• Data monitoring and processing system

• Data transmission to central control

• Data receive system from central control

• Power adjustment by central control system

Installation

• Services – water, HP air etc.

• Cabling

• Wiring

• Testing

• Commissioning

Radio Frequency Quadrupole

LANSCE DIVISION RESEARCH REVIEW Courtesy of LANL

Radio frequency quadrupole accelerating structure

Illustration from RF CAVITIES FOR THE MUON AND NEUTRINO FACTORY COLLABORATION STUDYA. Moretti, N. Holtkamp, T. Jurgens, Z. Qian and V. Wu, FNAL, Batavia, IL 60510, USA

RF hardware for Muon Cooling

Coutesy of Center for Beam Physics, LBNL work supported principally by the U.S. Department of Energy under Contract No. DE-AC03-76SF00098.

LBNL - 805 MHz Low Power Test RF Cavity

Benefits for industry

• Keeps industry at the leading edge

• Provides challenges and training for engineers

• Raises company technical image

• Develops world-class technical contacts

• Promotes Company’s self esteem

• Good for UK plc

Any Questions?