NA_COLLECTOR

High power collection systems (horns, solenoids, etc) Coordinator J. E. Campagne (LAL) shortname: COLLECTOR


The major motivation of a Network Activity and also R&D studies in this field is that the collection system for the future neutrino beams will have to keep up with unprecendent challenging conditions as such as 1) more than one order magnitude more electric stresses (expressed in A.Hz) than the MiniBOON Horn and more than two orders of magnitudes than the present K2K Horn and the future NuMI and CNGS Horns and 2) a huge rapid neutron flux 10^22n/cm^2/6weeks due to the necessary integration of the TARGET inside the COLLECTOR system. The NA will attack the challenge by Defining, in collaboration with the TARGET team, a viable solution to all the integration problems imposed by the need of locating the target inside the collector: neutron radiation, heat load... Comparing focusing and collection capabilities of the few main options of collection systems, as simulated by the few main existing codes Conducting particle production and collection simulations using different Monte Carlo programs: GEANT, MARS,... Conducting simulation of thermal and mechanical stresses of the collection systems to define the critical points Studing resistance of different materials proposed for collectors operating under severe radiation conditions Studing the cooling system to optimize the operating heating temperature of the alloy Estimating reliably lifetime expectations under unprecedented operation conditions (highly radioactive enviroments at high repetetition rate). Proposing R&D projects and establishing collaborations for the design and test of horns and other collection systems, as they are likely to evolve to cope with increasingly severe conditions, from the present conventional beams up to full power neutrino factories

Attempt to modify the content of the CONTRACTING PARTICIPANTS tables: IN2P3

The Institut will coordinate a consortium including physicists from French CNRS and University Laboratories (IPN Lyon, LAL, LPNHE Paris VI&VII) contributing long term expertise in the field of neutrino PHYSICS, experiments & beams. It expects then to contribute to the general steering and provide technical expertise in the field of COLLECTOR technology design studies. (BETABEAM ???? )

Deliverables and relevant milestones:
COLLECTOR
The first deliverable for Summer 2004 will be a status report (R1) on existing collection systems used in the past and currently in operation (MiniBOON/K2K) and in construction (NuMI/CNGS). Then, till end 2006, studies will be condcuted, to produce a detail report (R2) on a specific solution for the SuperBeam project. Then, till the end of the NA Jan. 2008, it is foreseen to produce a detail report (R3) on the different solutions that will be avaliable for the Neutrino Factory project.

The 2 last reports (R2 and R3) will be based on

a detailed particle collection simulations (Monte Carlo based simulations with state-of-the art code: GEANT4, MARS,...),

thermo-mechanical simulations that implies for instence to experimentally measure some relevant parameters (heat diffusion coefficients, stress limit under high neutron fluxes and after 10^8 cycles...),

complete technical specifications of electric power supply and discharge equipment

state-of -the art knowledge of mechanical properties of alloys under high rate neutron irradiation as already mentionned.

They will include proposition of specific solutions or R&D to be conducted necessary to achieve a lifetime of such system of few 100 Mega cycles or more. For instance, the documents will address solutions

to the choices of material for the collection device,
of machining, soldering and assembling techniques,
of heat removal and cooling system,
to the problems of TARGET integration in the collection system
and of periodic replacement in a high radioactive environment.

Other deliverables will be intermediate specialized notes and worshop proceedings that will be used for the final
document, and simulation programs that will be worth to develop for these studies.

5 Year Schedule (from Roger)

Spring 2004 Initial meeting of the Target and Collector Sections. Allotment of specific duties.

Summer 2004 1st Main Meeting (with international participants) to present the current progress in target and collector studies.

Winter 2004 Publication of the current position of target and collector development.
Preliminary recommendations for future R&D.

Summer 2005 1st International Conference on Targets and Collectors.

Spring 2006 Publication of Conference Proceedings.
/Summer 2nd Main meeting of the Target and Collector Sections.

Autumn 2006 Publication of interim report on Target and Collector developments.
Recommendations for future R&D.

Summer 2007 2nd International Conference on Targets and Collectors.

Spring 2008 Publication of Conference Proceedings.
/Summer 3rd Main and final meeting of the Target and Collector Sections.

Winter 2008 Final report and recommendations of the Target and Collector Sections.

Plans for the following 18th monthes COLLECTOR
Before the NA will start:

report on 6000 type alloy caracteristics on mecanical properties under high intensity neutron flux based on bibliographic documentation
initiate collaboration with French-CEA for stress limit measurement of 6000 type alloy under high level of neutron flux.
report on analytic solutions of the Horn thermal/mecanical design
start of thermal/mecanical simulation of the Horn for a SuperBeam project
first report on electric power design of the Horn for SuperBeam project
proposal for Horn prototype building as Design Studies Technical Work Project

Spring 2004

first guide of the collection systems used in the past, present and near future (along R1 publication): mechanical stresses and design, electric power caracteristics and design, heat dissipation system design, failure description, lifetime in operation
status report of the CERN Horn prototype
reports on other mechanical tests as diffusion coefficient measurements
integration of preliminary TARGET parameters on thermal/mecanical simulation of the Horn for a SuperBeam project
first drawing design of a new Horn prototype

Summer 2004

R1 repport production
status report on thermo/mechanical simulations
status report on electric power design to deliver 300kA/50Hz

Spring 2005

first result on stress limit measurement of irradiated materials
final design of a new Horn prototype to launch realisation

Afterwards their will be prototype realisation by the Design Studies TWP and measurement campain that will end by the writing of R2. Then, new work will be undertaken by DS TWP in the line of R3 report goal.