Beam off for most of last week

1

• Beam off for most of last week
• Horn repair
• Brief running over weekend
• Turned off this morning for dehumidifier repair
• A few detector problems over the week

2

• Horn 2 Repair
• Replaced 3 ceramic breaks on horn 2 water lines
• One had been leaking
• The second looked suspicious
• The third was replaced pre-emptively
• All horn 2 ceramic breaks have now been replaced
  with newer, more reliable style
• Horn 2 was optically surveyed in place to within
  0.5 mm of desired position
• Horn pulsed and operated over weekend
• Raw System Repairs
• Fixed 2 minor leaks
• Pipe leading to RAW skid
• Pump seal (pump was replaced)

3

• Target Hall Dehumidifiers
• Turned off this morning for Munters personnel to
  repair dehumidifiers
• Damaged heating coils being replaced
• Demisting plates added to ensure water flow out
  the drain
• Munters will tune flow rates and settings to
  optimal
• Should be finished tomorrow afternoon

4

• Beam Operations
• Quicker than expected repair of horn 2 allowed a
  pilot run over the weekend before Munters arrived
  to work on dehumidifiers
• Short tuning period kept us at 6 turns (185 kW)
• Hope to come up quickly this week to 7 then 8
  turns (215-245 kW)
• About 1e18 additional protons delivered through
  this morning

5
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6

• NEAR DETECTOR Alec Habig
• 99.68 livetime for beam (no problems)
• Magnet was off for a few days last week (cosmics)
• Pipe carrying sump water to the LCW exchanger was
  changed from stainless to PVC
• Bacteria eat the steel and clog up the cooling
  circuit

7

• FAR DETECTOR Bill Miller
• 87.8 livetime this week for cosmics
• 60.5 livetime for beam
• 2 problems causing downtime
• Improper cosmics run configuration on Wednesday
  led to only part of the detector being read out
• Would probably have been caught be a shifter
  (none b/c of no beam)
• Saturday with beam UPS failed and took a breaker
  with it
• Problem was quickly noticed and diagnosed by
  shifter at Fermilab
• Unable to repair until morning because we no
  longer have 24/7 shaft access
• Was fixed Sunday morning when we regained access
• About 3.3e17 of beam was lost at far detector