Graphite Target. beam. 1st Horn. 2nd Horn. 3rd Horn. I=320kA. Status of horns. A.K.Ichikawa. Activities. T. Sekigutchi joined the target-horn group. US group (E.D.Zimmerman, J.Spitz, L.Bartoszek) have contributed on beam MC study, design of horns. Other contributions by T. Nakadaira,
S. Tada, Y. Yamada, S. Koike, Y. Suzuki,
T. Kobayashi et al.
Iron structure (= helium vessel)
supports horns and shields
Striplines locate far from horn body to reduce heat load from radiation
Setup for the test operation.
Striplines are extended downward for the test.
Ceramic disk to insulate outer-conductor and water-pipes
Aluminum knife-edge seal for water seal
Forced He cooling is necessary to cool heat load from radiation.
Clamp to resist the Lorenz force is designed not to prevent He flow.
Stress w/ Lorenz force
Self priming canned motor pump
Test will be done soon with canned motor pump option.
75mm thick plate
Pipes and supporting shafts go through this plate.
Rigidity is the issue to achieve 1mm alignment
Here, we will have remote connection mech. for support, pipes and striplines.
Distortion is <0.3mm.
(Tolerance of the horn alignment is 1mm.)
Strong enough for earthquakes and (unexpected) 2-points crane hanging.
Radiation level calculation by Y. Oyama.-> not fully satisfactory but maybe acceptable.
We plan to make prototype in next FY.
Kinematic mount on leveling block on xy-stage.
X,Y,Z position can be adjusted with freedoms to absorb manufacturing errors.
When the module installed remotely by crane, it can positioned automatically while absorbing manufacturing errors.
It works well!
Remote disconnection/connection from this level
Alignment of (e) part of the new horn will be done at the Dock using a spare support box, on which alignment of (a) and (c) are already done.
We assume that it will be valid with the existing support box.
Spare support box
Only (b) has an re-adjustable mechanism.
Other parts will be fixed once it is adjusted.
(a) and (c) : correct manufacturing error of the support box.
(b) correct target station He chamber distortion.
(d) guide mechanism between the support box and horn frame.
(e) correct manufacturing error of the horn frame.
Remote coupling here for easy access from the top level.