Collaboration meeting, Riverside 24th -27th March 2010

Andrew Moss

ASTeC

Collaboration meeting, Riverside,

24th – 27th March 2010

MICE RF Amplifier Status

Collaboration meeting, Riverside 24th -27th March 2010 Andrew Moss

Outline

• Status of large amplifier

• Status of power supply

• MICE hall design/implementation

• Conclusion

Collaboration meeting, Riverside 24th -27th March 2010 Andrew MossAndrew Moss

2 MW

Amplifier

2 MW

Amplifier

Master Oscillator

Controls etc

201 MHz Cavity Module

2 MW

Amplifier

2 MW

Amplifier

201 MHz Cavity Module

LBNL

CERN300 kW

Amplifier

300 kW

Amplifier

300 kW

Amplifier

300 kW

Amplifier

HT

Supplies

HT

Supplies

Daresbury

DL Test System

The Task for Daresbury RF group

Collaboration meeting, Riverside 24th -27th March 2010 Andrew Moss

Daresbury Test system

What is built at

DL currently

Collaboration meeting, Riverside 24th -27th March 2010

TH116 amplifier

Andrew Moss

•Connected to its test

load, tested water

flows, no leaks

anywhere inside

circuit or load

•Manufactured input

sliding short for input

tuning, tested

operation of grid and

anode tap moving

circuits, so far all this

looks good on network

analyser

Collaboration meeting, Riverside 24th -27th March 2010

116 HT tank

Andrew Moss

• ‘Test TH116’ triode in

amplifier HT tank

• Water connections

• HT connection visible,

water feed and return are

inside this connection

• PTFE insulators

• This part of the amplifier

is up at 40kV, arcing a

danger and large risk

Collaboration meeting, Riverside 24th -27th March 2010 Andrew Moss

Protection for the HT tank

• Installing arc detectors,

smoke alarm and camera to

monitor conditions inside

the HT tank remotely

• Any arcing will damage

silver plated components

and require a

stripdown/repair to be made,

this would take months to

fix and we must be careful

to avoid this, will gently run

the amplifier up and

understand how to operate it

Collaboration meeting, Riverside 24th -27th March 2010

HT power supply• Tested PLC controller that

monitors and interlocks all the

auxiliary power supplies with

cooling, door interlocks and

equipment protection systems

•Filament heater tested to full

power on the test triode

•Cathode bias unit tested to

operation levels

•System earthing assessed and

corrected to promote return

current path back through

monitor circuits

Andrew Moss

Collaboration meeting, Riverside 24th -27th March 2010

HT power supply

Andrew Moss

• Still left to do :-

– Some wiring control

wiring between amp and

HV rack/Aux rack

– Cathode modulator needs

building/testing

– Crowbar circuit needs

testing

– HV pressure test of

amplifier and HV

components

– Estimate 1 months effort

Collaboration meeting, Riverside 24th -27th March 2010

Schedule

•All four MICE 116 tubes

are on site at Daresbury

ready for experiment

•Plan to test assembled

amplifier then assemble a

CERN amplifier and test

•Build new power supplies

for 4616 and 116 sections

and move first set down for

install at RAL by end of

2010 if money allows

•RF testing of amplifiers

will receive sustained effort

for 2010 so that setup in

the mice hall can be more

easily achieved

Collaboration meeting, Riverside 24th -27th March 2010 Andrew Moss

RF Load

• Altronic Reaserch water

load, already tested to

3MW pulse

• Load

• Water cooling plant

• Much smaller than our

current test load which

would be a major positive

design change for the hall

installation

• Possibility to have one

cooling plant for multiple

waveguide loads - ideal

for MICE due to low

average power

Collaboration meeting, Riverside 24th -27th March 2010 Andrew Moss

Amplifier to cavity installation 1

RF Loads

Collaboration meeting, Riverside 24th -27th March 2010 Andrew Moss

Amplifier to cavity installation 2

RF Loads

Collaboration meeting, Riverside 24th -27th March 2010

Hall implementation

• Starting to work on hall plan in more detail

• Expect to be able to use 3D CAD drawings to be able to understand how to fit the RF equipment under the floor and to see how the system can be built up in installed sections

• Smaller load identified, need to look for phase shifters and hybrid devices next to reduce size of these items

• Nitrogen pressure will be used for whole waveguide system to raise voltage stand off and provide a ‘W/guide complete’ interlock

Andrew Moss

Collaboration meeting, Riverside 24th -27th March 2010 Andrew Moss

Conclusion

• Large amplifier ready for testing, connected to water,

test load and checked with network analyser as far as

possible

• Some work remains on the power supply, this will

continue as staff effort allows

• Hall design in progress and components being

identified that will be better for the installation, need

to progress to 3D CAD models as soon as possible

• Committed RF effort for this year to fully test

amplifier system