Status after April 4th (Linac #1)
Investigation for the interior of cavity
・Setting camera to measure interior
・In so far, no serious problems were found← Measurement

Camera view →Damage for Monitors
・About 15 current
monitors had problems.

Examination of all monitors is
not a trivial task. Removal
together with quadruple magnet.

Status after April 4th (Linac #2)
・ Vacuum pumps with waters were tested
and installed
Vacuum pumps
after inspection →・ Temporarily installed dryer (Humidity still
70% because of water leak from the floor).
・ Many bolts were dropped fromthe crane at the top.
→・ If this problem remains, therecovery work will be delayed.
Cracks seen on the neckposition for the crane→← Pumps with waters inside.
bolts that weredropped.

Status after April 4th (RCS #1)
Main Tunnel at RCS

Sub Tunnel at RCS
Main tunnel and sub tunnel at RCS (no serious damage).
Rail guide

About 1 cm gap
Connection point between RCS and Linac (about 1 cm gap).

7 mm drop

Status after April 4th (RCS #2)
・ Vacuum test started.
・ Impedance measurements.
・ Vacuum tube test started.
In so far, no serious problems were found.

Turbo MolecularPump

Scroll pump

↑Examination of Cable Racks

Drain work initiated →To open the door, some hard work
had to be done, like above.

Status after April 4th (Main Ring)
Magnets

Vacuum・No serious damage.
・Slight movement as seen below.

・ At the fast extraction there was a small leakageof vacuum in the septum magnets (～1E-12).
・ Using ion pump we continue to study it.
・ No other vacuum leakages.

↑ supporting plate with slight movement.

RF・ Humidity level was decreased. Stated to measure
RF impedance.
・ Impedance level was decreased. Will examine inmore details.

Power, Cooling Walter, Buildings
・ Walter pumping completed. Currently morehumidity control.
Examination for Monitors
・ High voltage supplies: Need substantial effort.
・ All BPM monitors were examined.
・ Cooling water will be available in May.
・ 60% of loss monitors were examined.

Alignment and Measurements① Linac・Inclined toward west direction.
・in the middle, the maximum inclination is about 3 mrad.
・Floor in the middle was approximately 4 cm smooth drop.
・Using laser tracker, we measure again.

② RCS ( 3 GeV Synchrotron)・Measurement was done using floor gauge.
・RCS floor is inclined toward the center of the RF (the maximum of 0.3mm/m)
・From extraction point to RF area, the is slight drop.

③ MR (50 GeV Synchrotron)

・Using MAR096 point as a standard zero, measurements were performed.
・There is a tendency that inclination toward the center of MR is observed.
・Between SDA61 and QFX61 there is a crack. The maximum of 0.3 mm drop
was observed.
・From injection to extraction, there is small drop.

Status after April 4th (MLF #1)
・ Mercury Target: Movement of 30 cm.
Confirmed after detailed examination.
・ Shield walls weremoved significantly.

Joint bellows moved.
Need replacement.

Neutron Source

Shield Wall

Mercury Target
Neutron Shutter
・ Vacuum leakage is observed.
・ Bolts were either removed orunfastened.

High Speed Chopper・This part is healthy.
Muon Facility
・Vacuum system is OK
・Small damage for cables.

・Partially destroyed but recoverable.
Beam Line Alignment

Status after April 4th (MLF #2)↑ Started to workfor Shield wall. →↑ Disk chopper was examined.

← Guide Mirrors.

↑ Removal of Pb shield wall.

BL-08: Guide Mirrors
were partiallydamaged, in particular,
near the joint region
between buildings.

Extended Buildings for MLF
The First Experimental Hall・ For an extended part, like BL-08 a large gap isobserved vertically. At this joint position
about 9 cm drop is observed and the guidemirrors were damaged.

The Second Experimental Hall・ A large drop (say , BL-19) for about 14 cm
for the extended part.
・ Discussion on how to repair the entire
extended halls.

Status after April 4th (Neutrino)・Reasonably healthy.
・Humidity is now decreased.

移動With crane many elements are now
returned back to normal.

Superconducting beam line.
Will return to normal
temperature and test it.

Muon monitor looks OK.

Status after April 4th (Hadron)・Cooling water has significant problem.

← Entrance for
the Hall. About
1 m gap.

↑ Disconnected pipes
Distortion of bellows →・Experimental Halls are reasonably OK.

・No serious leakage for vacuum.
← Switch Yard

Beam dump area.

Slight displacement isobserved for experimentalapparatus.

Crack observed on thefloor. Water leakage
is observed.

Alignment Work・For the entire J-PARC① Measurement of GPS② Standard point③ Detailed measurement with Laser trackers
All measurements will be completed by the summer.
・After that, further detailed measurement will be planned.

GPS Measurement

Electric Power and Cooling Water

・ Electric Power: Except 3 GeV powers are now recovered (some Linac is not yet available.).
・ Cooling Water: Not yet available for the entire facilities.

Future Plans
・ We will try to resume J-PARC activity including accelerator complex, MLF, Hadron andNeutrino by December, 2011.
・ Within JFY2011 (until March 2012) we set a goal to have at least 2 cycle operation for users.
・ Based on this, both KEK and JAEA submitted the supplemental budget on April 22.
・ Scheduling, in particular, for construction and repairs for buildings and roads are currently
being negotiated both within JAEA and KEK.