Andrew Moss ASTeC, Daresbury Laboratory October 2010 MICE RF Amplifier Status.

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Presentation transcript:

Andrew Moss ASTeC, Daresbury Laboratory October 2010 MICE RF Amplifier Status

Amplifier status Andrew Moss First medium power (300kW) amplifier and power supply system tested 2008 Refurbishment and rebuild of first high power (2MW) amplifier complete October 2009 Power supplies for first 2MW amp 100% complete Two further 300kW amplifiers awaiting repair Second 2MW amplifier stripped awaiting repair Two refurbished 2MW CERN amplifiers partly tested, inspected and awaiting build (in three parts currently) Still need to build 3 more sets of power supplies One more 300kW amplifier to buy/acquire

RF system components Andrew Moss 2 MW Amplifier Master Oscillator Controls etc 201 MHz Cavity Module 2 MW Amplifier 201 MHz Cavity Module LBNLCERN 300 kW Amplifier HT Supplies Daresbury DL Test System At present Auxiliary Systems Not found

Test system at Daresbury Andrew Moss

Current status of components Andrew Moss

2MW amplifier status Final electrical checks September 2010 – crowbar/cathode modulator systems complete Drive 4616 amplifier and 2MW amplifier connected via flexi and tuning stub Water system, air blowers and compressed air have all been on Filament test to 500Amps on tube All auxiliary power supplies have been checked out ok Safety paperwork needs completing before we power system Andrew Moss

2MW amplifier system Andrew Moss Amplifier output Tuning stub to aid impedance matching between drive amplifier and large amplifier Input coax from 250kW amplifier Amplifier local control system

Second amplifier system Andrew Moss Support stand, wrong height – to match other amps, needs replacing, CERN drawing available All components from amplifier

Coax design Coax system will use large phase shifter to make amplifier immune to reflected power issues Hybrid power splitters to divide power before each cavity with a rejection load, this should provide a robust system Local phase shifters in each cavity coupler, small range available only, so need to plan coax system carefully to get phase lengths within range at the cavity input couplers – simulation will be done at Imperial college by Saad Power monitoring in each section of coax will be linked in to RF control system so that issues can be flagged before faults occur Nitrogen gas pressure system with the coax for voltage stand off and interlock Plan to have the ability to connect test loads in place of cavity to test amplifier/coax system in its complete configuration – will depend on space for components Andrew Moss

Coax layout for each cavity Andrew Moss

Hall design in progress Working with 3D CAD engineer at RAL to plan layout between the amplifiers and cavities –Additional effort from Imperial for amplifier testing and layout/design Measurements of system dimensions at Daresbury have been taken First step is a simple block diagram showing all components and how they are interconnected Then understand how to optimise components with the layout of the hall and the space available Result will be a complete parts list required for each cavity that we can go out for tender for when appropriate Will liaise with Don Summers to order components Andrew Moss

Future plans for this year Test of first large amplifier is priority - now Amplifier testing likely to take 4 – 6 weeks to optimise the system using old tubes, then replace with new MICE tubes and repeat tests carefully Assembly of the first CERN amplifier, refurbished unit however many small parts, CERN have offered to send two people for a few days to aid with the assembly of the unit – we will take up this offer Would need to buy more coax components to test this amplifier in our system – coax bends, straights and a combiner Test of CERN amplifier scheduled for March 2011 First amplifier will be delivered and installed in the MICE hall Andrew Moss

Conclusion Complete first RF amplifier system ready for test, now in progress Design of hall components between amplifiers and cavities is in progress and will lead to a formal design of the coax system, how it will be supported and the sequence of installation, this should be done by January 2011 Funding will allow building of CERN amplifier and refurbishment of other LBNL amplifier systems Andrew Moss