MICE at

RF Power System: power source, distribution

Paul Drumm RAL

Ambitious title!

Paul Drumm 30 March 2004

RF Baseline Design

• RF Power Design driven by cost issues (no funds for a new system) – Optimal – one amplifier per cavity • 2 Amplifiers from LBNL = 4 MW total • 1 or 2 Amplifiers from CERN = 4 MW total – If 1 amplifier – needs a bigger drive?

• Spare TH116 Tubes from ISIS • Split or more amplifiers?

– Circulator – cavity ↔ amplifier isolation – Hybrid device - possibly cheaper – some coupling?

– Assume that we do R&D (trials) when we have the equipment • Need both cavities and one amplifier circuit • Test out a hybrid circuit driving two cavities Paul Drumm 30 Mar 2004

Progress since October CM

• December LBNL – Discussed shipping equipment to RAL – Two 2 MW power amplifier circuits – Three (300kW) driver circuits – 4616 test stand – LBNL loan – to be written off (eventually) – MoU to be signed Paul Drumm 30 Mar 2004

• At LBNL – Stripping down for transport – Cleaning – Packing – Shipping…

… December

Paul Drumm 30 Mar 2004

LBNL Power Amps

Paul Drumm 30 Mar 2004

300 kW Driver Amplifier

Paul Drumm 30 Mar 2004

4616 Test box

Paul Drumm 30 Mar 2004

Staff…

• Roy Church – Used up quota of days – No Roy till April – Mike Dykes (group leader) – Andy Moss (senior RF Engineer) – plus two more – MD & AM are here… Paul Drumm 30 Mar 2004

Plan for Early 2004

• Limited funds – Berkeley RF system to DL – Strip down and make a technical assessment of the equipment • Cost to refurbish • Confirm equipment is serviceable – 6 month overlap with Roy • Review RF design in the light of CERN RF proposal Paul Drumm 30 Mar 2004

For Late FY 2004

• Setting up a test-stand at DL – Hall and facilities available – Need to have got through GW2 • i.e. be in full funding mode Paul Drumm 30 Mar 2004

RF Power Systems

• 8 MW of RF Power @ 1Hz and 1 ms <8kW> • Expensive to buy new • 201.25 MHZ common to old linacs – LBNL, CERN, ISIS, KEK, Los Alamos • 4 MW from LBNL (2x2MW) + ISIS valves • 4 MW from CERN + new valve ?

• How to transmit the power ? – Cheaper, hybrid – Expensive, low risk Paul Drumm 30 Mar 2004

Split – Circulator - RF Scheme

R.F. LEVEL SUM R.F.LEVEL

CAVITY PHASE CAVITY 70db COUPLER PHASE SHIFTER CIRCULATOR F R PHASE DET 70db COUPLER TUNE ERROR LOAD MATCHED POWER SPLITTER CIRCULATOR TH116 2.5MW

CAVITY F R CAVITY PHASE TUNE ERROR LOAD PHASE DET 33kV H.T.

4616 250kW SOLID STATE DRIVER 18kV H.T.

R.F. LEVEL AND PHASE CONTROL R.F. SOURCE Paul Drumm 30 Mar 2004

2 MW Transmitter 2 MW Transmitter Master Oscillator 4 MW Transmitter

Baseline ?

201 MHz Cavity Module 3 db Hybrid & Load Matched Splitter Circulator & Load 201 MHz Cavity Module Paul Drumm 30 Mar 2004

ISIS Linac - RF System

Paul Drumm 30 Mar 2004

TH116

• Thales 5 MW tube – ISIS uses 1 or 2 tubes per year – Few customers for this tube – Thales: • success in small numbers not good • looking at large orders 10-20 tubes – Alternative tubes (?) 2 MW – splitting… Paul Drumm 30 Mar 2004

X-Ray Shielding – Conditioning/Running Control Rooms Paul Drumm 30 Mar 2004