It was agreed that for such studies detailed geometries must be clearly specified and posted on a web-site ( probably, acfahep-ffir group site ). Parts of beam lines and detectors are desired to be "decoupled" in the GEANT4-framework as much as possible. It means that an interface between them must be well-designed so that NLC or TESLA beam lines can be easily implemented in the simulation for an example. Since NLC group has already started to simulate machine-related backgrounds by GEANT4, it is better to know their method and present status at the beginnng.
we agreed on further discussion on this study. A. Miyamoto will arrange the second TV
conference, where an explanation of JUPITER (JLC detector simulation based on GEANT4), NLC
study and work-sharing will be discussed.
(2) Particle distribution at quad by tracking-1 at the dump line (Kubo)
2 pages, pdf ,86kB )
K.Kubo showed particle distributions at QC1, QF1, QD1 and BH1 of the dump line by
SAD-tracking. The distributions is very asymmetric in horizontal direction since the
disrupted beam has "low energy" tail and passes through a superconducting QC1.
The present geometry assume a superconducting magnet with l*=4.3m for the final focus magnet
as a current design.
(3) Design of superconducting magnet (Tsuchiya)
2 pages, pdf ,154kB )
Instead of K.Tsuchiya, T.Tauchi showed a design of superconducting final focus magnet.
It is QD0 with a field gradient of 64.35T/m and 3.35m long, which is equivalent with the QC1.
The inner radius is 8cm. The super conducting coil
is heat-insulated by three stainless steel pipes; which are 3mm-thick inner vacuum vessel,
8mm-thick 90K thermal shield and 6-mm thick inner He vessel, and it is tightly supported SUS
collar. The outer radius is 27 cm. The other upstream magnets are conventional warm-iron
ones, which will be designed by K. Egawa (accelerator). The design must be taken account of
the particle distributions given by K.Kubo.
The next meeting will be on 25 April (Thu.), 2001 13:30 - 15:00 at 3 gokan, 325.