Andrew Moss ASTeC TIARA Mid term meeting 12 th 14 th June 2012 CIEMAT ICTF Progress on the MICE RF System.

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Presentation transcript:

Andrew Moss ASTeC TIARA Mid term meeting 12 th 14 th June 2012 CIEMAT ICTF Progress on the MICE RF System

Contents Brief amplifier introduction and status Amplifier testing Results of RF review Hall layout ICTF upgrade amplifier Conclusion Andrew Moss

Muon Ionisation Cooling Experiment MICE MPB 28Jun11Andrew Moss Hydrogen absorbers RF cavities

RF system components Andrew Moss 2 MW Amplifier Master Oscillator Controls etc 201 MHz Cavity Module 2 MW Amplifier 201 MHz Cavity Module LBNLCERN 250 kW Amplifier HT Supplies Daresbury DL Test System At present Auxiliary Systems Ordered

Test system at Daresbury Andrew Moss

Amplifier layout Andrew Moss

Amplifiers Andrew Moss 4616 tetrode cavity TH116 Triode cavity Triode grid circuit

Status of Amplifier s and power supplies Test bay at DL is operational and able to test amplifiers and power supplies as they become available First 250kW amplifier has operated at 100kW with old tube, then 240kW with new tube fitted during 2012 First TH116 high power amplifier has operated at 1MW during 2011 using an old RAL tube – new tube fitted now, awaiting test with driver at 200kW – should produce 2MW Two further 250kW amplifiers are being refurbished now Two refurbished 2MW CERN amplifiers refurbished but awaiting assembly and high power test Still need to build 3 more sets of power supplies – including set for TIARA tests in experimental hall One more 250 kW amplifier has been bought, and is currently under test at the manufacturers - operating at full power Andrew Moss

Refurbished TH116 Triode amplifier Andrew Moss

RF and power supply testing A number of power supply and amplifier issues have been solved during testing so that stable operation can be achieved System pushed to 1MW RF output with 50% electrical efficiency, good gain and no noticeable microwave or X Ray leakage Andrew Moss Forward power into load

Review of the ICTF RF system Review meeting held in December 2011 to assess all aspects of current RF system design and strategy - praise for the design work we had done and the results with the amplifiers The main concern of the review panel was of the RF coax layout, the panel suggested a different layout that would improve access to the amplifiers and simplify the coax runs. This was taken on board and a new layout designed Previously a lot of RF components were placed behind Shield wall TH116 Triode amplifiers 4616 tetrode amplifiers

Andrew Moss Hybrid power splitters on inside of magnetic shield wall

Andrew Moss

Hybrid power splitters and reject loads 6 inch coax

Andrew Moss Manual phase shifters used to adjust phase length 4 inch coax

RF phasing Andrew Moss

RF to beam synchronisation Cavity phase and amplitude will be stabilised to 0.5 deg and 1% with the ability to run as high a gradient as possible Muon particles will arrive randomly in the cooling channel for acceleration at various energies Cavity phase angle will have to be measured and time stamped for analysis after a period of running Time of flight detectors along the cooling channel will be used to trigger electronics to measure and digitise the state of the cavity phase angle to < 15 pS Groups from Sheffield and Strathclyde University’s in conjunction with DL and LBNL are working on possible solutions for this area of the experiment Andrew Moss

task 7.2 : Novel pulsed RF power amplifier design Andrew Moss Work has started on a review of the state of development of diacrode systems in the international community. –One goal of this review is to identify designs or recommendations of “best practice” that can be incorporated into the design that will be developed. –In particular, contact has been made with Los Alamos where diacrode tests are in progress. –Taking into account the results of these tests will be important in the development of the amplifier design for the ICTF. –A visit to Los Alamos facilities took place in March 2012 were the diacrode was seen operating at 3.1MW –TIARA pulse conditions will be tried and expect to produce 3.5MW with report to follow First deliverable : Simulation of Diacrode complete, planned 31/5/12. –Drawings of the diacrode amplifier have been procured from THALES. –These drawings will be essential when the design work on the ICTF amplifier starts in earnest. –The space constraints of the application in the ICTF Hall will require special consideration. 3D model of ICTF amplifier produced at CERN

Summery One amplifier system and its associated power supplies has been assembled and tested to 1MW so far We plan to replicate the power supplies and install them in the ICTF hall at RAL – this will allow testing to continue and satisfy TIARA requirements RF review has prompted a new round of optimisation of coax distribution that looks to make things easier in a number of areas, space around the amplifiers, lower transmission loss, easier to install 3D cad model of ICTF upgrade amplifier has been done, tests at Los Almos with TIARA conditions will feed into the optimisation of the eventual design Andrew Moss