Daresbury MICE Progress Andrew Moss Joe Orrett Peter Corlett
Initial inspections of 4616 circuits • LBL equipment arrives Jan 05 • Initial inspections • 4616 circuits look ok !
Solid state pre drivers • ISIS and CERN use Dressler 4. 5 KW amps • Currently these are not available, although this may change • Companies in the UK and US have indicated they can produce them ( ~ $70 K) • Only issue may be the cost, although the original Dressler units were not cheap • RAL specification has been sent to a UK company for a price quote • Possiblity of MICE, RAL, CERN ? group buy
HT for 4616 • New charging PSU’s will be ordered ~ 3 k • Crowbar switches including firing circuits e 2 v ~ 14 K, ABB ~ 15 K • Capacitor bank 22 u. F 40 KV PPM ~ 5 k • Construction costs • Visit to CERN to assess obsolete HT equipment, systems were not suitable for MICE, but would be ok as a test set. • Orders for charging unit, cap bank and crowbar unit about to be made
ALE 152 A 20 k. V 1500 J/s charge rate £ 2973 22 μF Capacitor £ 4102
Crowbar System Two Choices e 2 v MA 3536 A ABB Crowbar Switch • • Thyratron based. Max HT 25 k. V Peak Current 10 k. A Price £ 13, 500 Semiconductor stack Max HT 20 k. V Peak Current 5. 5 k. A £ 14, 925
Crowbars e 2 v MA 3536 A ABB(52 k. Vshown)
High Power Coaxial Components • 4616 Test set-up. 3 1/8 “ coax 9 3/16 “ - 3 1/8” Coax reducer 4616 Amplifier Directional Monitor coupler Water load 2. 5 MW 12 foot long
• Complete System (4616 + TH 116) high power test set-up 3 1/8 “ coax 4616 Amplifier 9 3/16 “ coax TH 116 Amplifier Water load 2. 5 MW 12 foot long
Items required in the short term • 3 1/8” – 9 3/16” coax reducer (to allow 9 3/16” water load to be used on 4616 tests) - £ 2 k • Directional Coupler - £ 1. 7 k x 2 • Water Load - £ 12. 2 k • Various straights / Bends ~ £ 10 k • Power meters – use existing HP power meters • Total = £ 25. 6 k
4616 circuit strip down • 4616 tubes sent to RAL for testing • Manufacturer's expect the tubes will be U/S • New tubes around $40 K • Sockets look in good condition, possibly only need new finger strip • ½ wavelength input couplers tested ok at RAL • Original cabinets will be repainted with new panels where needed
MICE test area • In an existing plant room • Large electrical and water supplies • Room to expand if necessary
Services • Electrical Dept ready • Water services close to design and construct by under floor duct power requirements • Construction of test • Visit to RAL to see water panel by Oct 05 systems in action • Original piping of the circuits looks ok, but will be assessed
The plan • Majority of work this year will be on 4616 circuits • Expect to run first circuit by the end of the year into a test load • Purchase of components to test 1 MW systems may be possible, water loads etc • 1 MW amplifiers will not be striped down this year • Still no indication of when TH 116 will become available • Cost of refurbishment items looks broadly similar to original costing, work continues in this area
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