COBRA Magnet Status. W.Ootani ICEPP, University of Tokyo MEG experiment review meeting Feb.11 2004, PSI. First Excitation Test in June’03. Summary First excitation test was carried out in Japan last June. The test was not completed because of some problems.
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Graded field profile measured at 200A
The problems were quickly fixed and the second excitation test was carried out last August.
Quench was propagated in the magnet fast enough to keep ΔT and ΔV below the acceptable level.
Heater at central coil is fired
SQD reacted at central coil
Protection heaters ON
SQDs reacted at the other coilsSQD Reaction in Quench Test
Sufficient mechanical strength
Power supply, compressor, mapping machine, etc
COBRA in SLS hall
MEG magnet team
5.6% over excitation was successfully done at PSI.
COBRA seems to survive long journey from Japan.
Good performance was confirmed in quench test up to 360A.
πM3 beam line
COBRAInfluence of Fringing Field
COBRA fringing field would affect neighboring facilities.
2.6 GaussEffect of Iron Wall
Active shielding in LTF of πM3