MICE VC 17 Aug 20051 MICE MAGNETIC FIELDS & SHIELDS J. H. Cobb & H. Witte Oxford University Magnet fields for MICE (VI) calculated including magnetic shield.

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Presentation transcript:

MICE VC 17 Aug MICE MAGNETIC FIELDS & SHIELDS J. H. Cobb & H. Witte Oxford University Magnet fields for MICE (VI) calculated including magnetic shield discs at request of software people Minor adjustments to end-coil currents to get uniform field in spectrometers Recalculate fields at positions of PID detectors with shields  All documented in MICE Note 119, q.v. for details  Some comments on possibility of lighter shield

MICE VC 17 Aug Shield: 100 mm soft iron 400 mm from end coil Spectrometer solenoid

MICE VC 17 Aug Calculations made with FemLab after comparison with OPERA B in solenoid – no visible difference between FemLab & OPERA Used OPERA default B – H curve for soft iron

MICE VC 17 Aug Field in iron Average ~ 1.5 T – not saturated Hot Spot is artefact of FEA calc. OUTSIDE INSIDE SOLENOID Z r B z in channel, r = 0 Minimal difference iron/no iron except at ends

MICE VC 17 Aug External B (obviously) less with iron  Beam less confined  Problem ?? TBD (software folk) Shield Adjust end-coil current only by ~2.5% to give dB / B < 1% in solenoid i.e. like no iron

MICE VC 17 Aug Shielding efficiency – summary table follows TOF Ckov EMCal |B| r Black = No Iron Red = with Iron Residual EMCAL ~2x higher than shown in TDR ~ 38mT

MICE VC 17 Aug Fields  with currents adjusted for the iron  are calculated & available as z – r map Fields at positions of TOF, Ckov & EMCAL calculated  S/W & PID people must see if they are OK This Shield does ~ nothing for EMCAL NOTE No allowance for ‘Tunnel’ (shielding around hall) Investigate if it’s possible to reduce amount of iron for same shielding efficiency by subdividing shield....

MICE VC 17 Aug Subdivide Iron Shield -- Summary (plots follow) Fields in mTesla Discs (TDR w. Tun-- w/o Tun) T | 6.35| 100mm T x10 -x10 Gap | 6.35| Tot Fe mm ============================================================================== TOF Ch Cal all ~ Now/TDR~1.8** r = 25cm r = 38cm r = 35cm TOF most sensitive to shield configuration Shield does ~0 for EMCAL !! Subdivision gives equal shielding with less iron but more total length Total Fe(mm) | | Total 0| | Gap (mm) 10| 110 | 25| [105] [97]| 50| 118 * | 57| 102 | | |

MICE VC 17 Aug  10 x 6.35mm (0.25”) plates + 9 x 6.35mm gaps  |B| = 102 mT c.f. 105 mT for single 100mm plate Total length = 121mm; saves ~35% of the mass of the iron for extra 21mm |B| at TOF for 7 configurations of Iron Discs & Gap

MICE VC 17 Aug Summary Field maps exist Waiting for response from S/W & PID people on beam scraping & residual fluxes Note -- we find ~ twice residual field at EMCAL than value quoted in TRD Shield does a lot for TOF, some for Chkov, little for EMCAL Possible ‘Shield Lite’ solution using 10 x 1/4” plates (though is it worth the extra effort?)