The "hadron hose" is a new toroidal focussing system for
the NuMI beam which will go inside the decay pipe tunnel.
It is a 1 kA wire which runs down the
center of the NuMI decay pipe, providing a restoring force to diverging
pions as theypropagate down the pipe.
The Hadron Hose provides focussing of the pions after
the magnetic horns, and will help reduce our systematic uncertainties in
predicting the muon neutrino spectrum at the far detector.
Below is a picture of the beamline with and without the Hadron Hose.
The hadron hose's 1 kA wire provides a toroidal magnetic
field that causes the pions coming from the target and
horns to orbit around the wire. This steers them away from
the tunnel walls where they could interact before decaying
to neurinos, and also reduces systematics in the neutrino
energy spectrum (see the Hadron Hose Proposal).
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Journal Articles
Draft article submitted to Nuclear
Instruments and Methods A. If you want the source files click
here.
Submitted paper to Particle Accelerator Conference: paper, poster.
Talks at Conferences/Workshops
The Hadron Hose is a collaboration of the following institutions.
A talk
given by S.Kopp on the hadron hose at the
2nd International Workshop on Neutrino Beams held at Fermilab,
Sept. 6-9, 2000.
pdf,
Powerpoint.
A talk
at the Nov. 2000 DoE Lehmann review of NuMI:
pdf,
Powerpoint.
Proposal for the Hadron Hose (Oct 1999)
Technical Design Report submitted in May 2000
Energy deposition in the hose wire due to the beam (calculated by IHEP
collaborators):
Original Draft,
New Draft
Analytical calculation of pion orbits
with the hadron hose.
Fermilab conducted an external review of the hadron hose
project. The
review committee was chaired by Gene Fisk, and heard presentations on
the technical design in May 2000, and on the physics case and results
of a full-scale prototype on October 5, 2000.
Talk presented by S.K. on
physics motivation for hadron hose: pdf,
Powerpoint.
Write-up on the physics case for the
hadron hose.
Write-up on the neutrino fluxes for the
hadron hose.
We are building a 40 foot prototype segment of the NuMI decay pipe
and equiping it with a Hadron Hose Wire down the middle. This segment
will be used to study installation and survey/alignment procedures inside
the tunnel. We have also found the prototype useful for trying in situ
demonstrations of new wire supports or tensioning mechanisms. The
prototype will be pulsed with 1 kA, 300 usec kicker magnet supplies
See construction and design photos of the
prototype here.
Here are some results on wire
creep that we've been doing
over the past months.
