P.S.
Problem with holding field interlock not really there. Real problem
was low water level in the surge tank and level indicators not
working. When surge tank low causes reduced flow. Longitudinal
holding field flow switch just the most sensitive and hence first to
switch off. Surge tank refilled and preparing for beam again.
P.P.S.
On access to hall noticed WC helium tank pressures around 700 psi
which means they will last to Friday but will need to be exchanged
then. Iso-butane around 145 pounds so good for about 1 week still.
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