On Saturday July 21st the T1 Collimator solenoid valve would not re-open after tripping closed due to a (planned) loss of vacuum.  Shielding was removed and the valve solenoid was replaced which fixed the problem.  The original valve body was left in place.

This is the second time the solenoid at this location failed (See E-Log #239), and the latest of several failures of these new 24VDC solenoids at the T1 and T2 cooling packages.  Clearly they are not reliable in this radiation environment, so I will investigate an alternative to be installed in the 2018 Fall Shutdown or 2019 Winter Shutdown.

Cyclotron E-Fault #11420 has been returned.