NuMI/MINOS Status All Exp. Mtg. June 2, 2008 Jim Hylen/FNAL Page 1 FAR DETECTOR: 98.0% live time (wall clock) There was a power outage on the morning of.

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Presentation transcript:

NuMI/MINOS Status All Exp. Mtg. June 2, 2008 Jim Hylen/FNAL Page 1 FAR DETECTOR: 98.0% live time (wall clock) There was a power outage on the morning of May 22 at Soudan so the DNR can install a lightning arrestor on the headframe. The power outage coincided with a planned shutdown of the beam. Upon restarting the FD system, a timing system malfunction resulted in all FD time-stamps to be 1 second too early relative to the true GPS time. The problem was identified and fixed on the morning of May 29. During the period in question, neutrino events were still detected by the 4/5 and energy triggers. The software was updated to reclaim those events based on corrected timestamps. NEAR DETECTOR: Up 99.6% of the time (pot weighted) MINOS detector status

NuMI/MINOS Status All Exp. Mtg. June 2, 2008 Jim Hylen/FNAL Page 2 Protons / day for last two weeks Investigation of Horn 1 water system

NuMI/MINOS Status All Exp. Mtg. June 2, 2008 Jim Hylen/FNAL Page 3 Integrated POT

NuMI/MINOS Status All Exp. Mtg. June 2, 2008 Jim Hylen/FNAL Page 4 Protons per pulse, beam power

NuMI/MINOS Status All Exp. Mtg. June 2, 2008 Jim Hylen/FNAL Page 5 Ejection pump Check valve Remote swage-lock fitting Ceramic electrical insulation hole here in suction line drawing in air reducing water suction Flex-hose section of suction line Water collection tank Horn 1 suction line failing - similar to previous Horn 2 problem

NuMI/MINOS Status All Exp. Mtg. June 2, 2008 Jim Hylen/FNAL Page 6 Horn 1 suction line failing This is the 5 th ceramic failure. All 4 of the water line ceramics on Horn 2 have been changed to a new style that is not expected to fail. Horn 1 still has the old style. Horn 1 spare is being outfitted with all-new style; estimated completion June 6, then ready for installation.

NuMI/MINOS Status All Exp. Mtg. June 2, 2008 Jim Hylen/FNAL Page 7 Replace horn rather than repair – but save for offline repair in 2009/2010 Horn 1 residual radiation map as of Aug, 2006 – should be higher (x2 ?) now Previously replaced a ceramic on Horn 1, but that was a smaller supply line with compression fittings, -- this suction line requires cutting, installation of compression fittings

NuMI/MINOS Status All Exp. Mtg. June 2, 2008 Jim Hylen/FNAL Page 8 Repair estimate Have turned down spray rate somewhat keep horn running – but problem continues to get worse, expect to stop for repair tomorrow Time estimate for replacing horn with spare: two to five weeks Horn 1 removal requires retraction of target. Last time target was retracted, drive stuck and target had to be replaced. (couple weeks work) Want to use this opportunity to remove 1 st target from Morgue - autopsy to check for radiation damage – are in unexplored territory! - make room in Morgue for next dead component (extra day or two) Want to do low-power beam scan of horn with target removed, to confirm beam alignment (extra couple days) Probably will replace stripline-block/remote clamp as well

NuMI/MINOS Status All Exp. Mtg. June 2, 2008 Jim Hylen/FNAL Page 9 Spares status