Progress on Target Design Chris Booth Sheffield 14 th July 2004.

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Presentation transcript:

Progress on Target Design Chris Booth Sheffield 14 th July 2004

Chris BoothUniversity of Sheffield 2 Components Linear Drive Diaphragm Spring suspension Position measurement system Drive waveform Feedback and control Operating environment concerns Radiation Beam heating

Chris BoothUniversity of Sheffield 3 Diaphragm spring Target Array of coilsMagnet(s) Position measurement Schematic design Linear Drive

Chris BoothUniversity of Sheffield 4 Linear Drive Work with Electrical Engineering Dept. Pre-prototype constructed –Moving magnet shuttle (2 magnets) –Static triple coil excitation –No commutator Does not provide required acceleration Measurements taken to measure and optimise flux-linkage Multi-phase design in progress (end July?)

Chris BoothUniversity of Sheffield 5 Diaphragm spring Target Array of coilsMagnet(s) Position measurement Schematic design Linear Drive

Chris BoothUniversity of Sheffield 6 Diaphragm Spring

Chris BoothUniversity of Sheffield 7 Diaphragm Spring suspension Design of small spring obtained from Tom Bradshaw (RAL) Scaled up to allow ≥37 mm travel Finite element studies to check stress and lifetime issues (Lara Howlett) Be-Cu sheet procured Wire-erosion arranged in Eng. Dept. workshop Produce first batch early August

Chris BoothUniversity of Sheffield 8 Diaphragm Spring

Chris BoothUniversity of Sheffield 9 Diaphragm spring Target Array of coilsMagnet(s) Position measurement Schematic design Linear Drive

Chris BoothUniversity of Sheffield 10 Position measuring system Inductive linear measuring system (Hengstler) Low mass moving scale Fixed magnetic read head Contact-free Resolution 50µm PCI-card readout Bench tests in progress, software under development

Chris BoothUniversity of Sheffield 11 Electronic Drive & Control PC-controlled arbitrary function generator High power audio amplifier (500 W? Specs. not yet finalised) Feedback & control system (to be developed) –Operator request (time & depth) –Position measurement samples (0.1 ms) –Load modified drive waveform into function generator

Chris BoothUniversity of Sheffield 12 Environment – Radiation What is radiation level at drive motor? –Problem for Nd-Fe-B magnets? Radiation level at position monitor? –Problem for electronics? –Radiation profile? Advantage in moving sensor or electronics out? –Possibility of shielding? Programme of measurements proposed for autumn ISIS run – radiation monitors plus samples magnets etc.

Chris BoothUniversity of Sheffield 13 Beam heating Tom Roberts’ presentation to collaboration meeting (30th March): “1.4E12 protons on target” to deliver 300 – 500 good muons to MICE Implies ionisation heating of 1.9 kW in 1 ms –Mean power Hz, Hz Fins to improve thermal radiation? Thicker shaft to improve conduction? (Curie point of magnets?) Effect on overall mass? Need better estimate of beam flux Model, plus tests with heating element in vacuum

Chris BoothUniversity of Sheffield 14 Timetable (as presented 30/3/04) First prototypeSummer 04 Develop controlAutumn 04 System testsWinter Cooling, stability testsSpring-Summer 05 Rad-hard componentsSpring-Summer 05 Interfaces with ISISSpring-Summer 05 Implement improvementsSummer 05 Final device construct/testAutumn-Winter 05 InstallWinter-Spring 06