1. 1 MICE Mtg June 13 2003 Elwyn Baynham RAL Focussing Absorber Magnet Brief comments on design status Focus Absorber WG meeting 13 June 2003

2. 2 MICE Mtg June 13 2003 Elwyn Baynham RAL Design Areas Addressed l Scope »Magnetic Modelling of forces »Modelling of coil support stresses »Quench and Eddy current analysis

3. 3 MICE Mtg June 13 2003 Elwyn Baynham RAL Forces l Reports by Holge Witte and Jim Rochford »Addressed –Symmetrical forces –Non symmetrical forces Scope »Need internal review of the two reports to confirm criteria and results »Have not seen any forces which appear to be frightening within the design tolerances »As part of this process we need to translate John Cobb’s tolerances defined for beam/physics into tolerances for magnet manufacture and assembly

4. 4 MICE Mtg June 13 2003 Elwyn Baynham RAL Coil Support cylinders- stresses l Report by Wing/Stephanie »Confirmed high bending stresses without inner cylinder »With inner cylinder stresses are acceptable »Basic tube thicknesses and end plates are in the right order »Need to make more detailed analysis –to include coil properties –to look at optimising the distribution of material

5. 5 MICE Mtg June 13 2003 Elwyn Baynham RAL Quench analysis – eddy currents - forces l Jim Rochford »Run first quench models –Single coil to determine di/dt profile –Peak temp ~ 110K »Run analysis of eddy currents in –Coil cylinders/absorber cylinders/windows l Holge Witte »Run analysis of eddy currents –Coil cylinders/absorber cylinders/windows l need detailed meeting to review this analysis –Confirm models/summarise outputs

6. 6 MICE Mtg June 13 2003 Elwyn Baynham RAL Quench analysis – eddy currents - forces l Window forces do not look excessive »Need to confirm materials properties l Power into absorber body tube l 14kWx3sec l 42kJ l ~ 1-2 Litres in 3secs l Pressure rise ??