MICE RF – TIARA and General Progress Tim Stanley RAL 5 June 2013.

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Presentation transcript:

MICE RF – TIARA and General Progress Tim Stanley RAL 5 June 2013

RF Amplifiers - Testing Aim: achieve 2 MW at Daresbury Lab before transfer of the TIARA system to RAL Previously achieved: Just over 1 MW achieved last Autumn.

Current position: – False trips of protection circuit (crowbar) in PSU; limits supply voltage to RF amplifiers. – Diagnostic tests over the last few weeks. – Replacement with re-used crowbar device (thyratron) gave some improvement; further conditioning and+ trials to recommence tomorrow at Daresbury Lab – High-spec thyratron available from Strathclyde University (circuit mods required) might enable RF testing programme to resume up to 2 MW

– Best long-term solution is probably to procure solid-state crowbar devices. (8-weeks delivery and dependent on budget). RF testing: Once crowbar issue is fixed, main task is to optimise tuning of the end-stage tube amplifier at/for high power; an iterative process.

TIARA System

TIARA Preparations for Installation Draft drawings have been produced, TS and AN at DL tomorrow to discuss detail Modifications to mezzanine floor have commenced Safety Document generated by RF group and being ratified at RAL. TS to be appointed EMF Protection Advisor.

De-mineralised cooling water system defined and drawn; interface/control panel to be built, and tested on TIARA amplifier system at DL before installation in MICE hall at RAL. Water supply, of sufficient spec for TIARA, is currently available in MICE hall.

a local water-monitoring and protection circuit is advisable for TIARA until the full control system is installed. trigger-generation unit required for timing of RF pulses in absence of LLRF full control system.

On-site supply of electricity: No remedial work expected until 2017; this might not even incur interruption of supply Compressed air for amplifiers: layout/routing yet to be finalised. Pressurisation (nitrogen gas) of co-ax transmission-lines, to dummy-load, is not necessary for TIARA RF milestone.

Procurement – Full System Substantial procurement of RF components through University of Mississippi – New Tetrode amplifier set delivered to University of Mississippi from Photonis. – 4 new tetrode valves ordered from Photonis – Loads on order from Altronics.

Distribution Network – RF 4” elbows delivered to U. Mississippi – Order placed for all other required co-ax components with Mega; numbering/ID system implemented and deliveries have commenced. – Orders for 2 additional capacitors for RF system 2 placed with GA. – Capacitor chargers ordered from Lambda – List of support equipment being prepared, including Solid state replacement for crowbar. RF test gear SSPAs – Don Summers (and colleagues) working on procurement; latest update: components for tuner-system ordered ($150K)

All major components required for TIARA deliverables ordered.