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 TH 116 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 (300 k. W) driver circuits – 4616 test stand – LBNL loan – to be written off (eventually) – Mo. U to be signed Paul Drumm 30 Mar 2004
… December • At LBNL – Stripping down for transport – Cleaning – Packing – Shipping… Paul Drumm 30 Mar 2004
LBNL Power Amps Paul Drumm 30 Mar 2004
300 k. W 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 • RF group at the Daresbury SRS ASTe. C – 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 GW 2 • i. e. be in full funding mode Paul Drumm 30 Mar 2004
RF Power Systems • 8 MW of RF Power @ 1 Hz and 1 ms <8 k. W> • Expensive to buy new • 201. 25 MHZ common to old linacs – LBNL, CERN, ISIS, KEK, Los Alamos • 4 MW from LBNL (2 x 2 MW) + 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 PHASE 70 db COUPLER SHIFTER CIRCULATOR CAVITY TH 116 FR CAVITY PHASE MATCHED TUNE ERROR PHASE DET 70 db COUPLER LOAD 4616 2. 5 MW 250 k. W SOLID STATE DRIVER POWER SPLITTER CIRCULATOR CAVITY F R R. F. LEVEL TUNE ERROR CAVITY PHASE DET LOAD AND PHASE CONTROL 33 k. V H. T. 18 k. V H. T. R. F. SOURCE Paul Drumm 30 Mar 2004
Baseline ? Master Oscillator 2 MW Transmitter 201 MHz Cavity Module 4 MW Transmitter 201 MHz Cavity Module 3 db Hybrid & Load Matched Splitter Circulator & Load Paul Drumm 30 Mar 2004
ISIS Linac - RF System Paul Drumm 30 Mar 2004
TH 116 • 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
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