Notes on a Comprehensive Program of R&D for Targetry and Phase Rotation K. McDonald 4/26/98 1. Goals Design + software and hardware validation of all key components of the target adn phase rotation channel: a. Primary target b. Capture and transfer magnet systems c. Beam Dump d. First stage of the phase-rotation channel including RF cavities and solenoid magnets Lab tests should involve components that are prototypes for a muon collider front end wherever possible. 2. Critical issues a. Target: liquid or solid, conducting or non. single or multiple? if liquid: in pipe or free? interaction of moving target with magnetic field shock damage (We MUST avoid this! but how to be sure in advance?) cooling radiation damage to target itself, as well as to infrastructure lifetime of components facilities for component replacement -- remote handling. b. Capture magnets: Peak field? Hybrid or superconducting only? Survivablity against heating and radiation damage Tungsten liners, water cooled? c. Beam dump: Where is it? Where are beam windows? Is target area in air, He, or vacuum? d. Phase rotation channel: What is the nominal momentum? RF frequencies? How close can the first rf cavity be? breakdown? materials life? How well can solenoid magnets be interleaved with low-frequency rf cavities. 3. Program for years 1-2 a. Target: Simulations of shock, cooling, MHD, radiation damage Test of liquid jet in magnetic field Test of liquid/solid targets in beam: short pulse of ~10^14 p at BNL b. Magnets: Conceptual design of final system Lab tests with `available' magnets, but which? MIT 12-T, 9-MW water-cooled copper? MIT 20-T hybrid magnet FSU 20-T, 24-MY water-cooled copper LLNL superconducting coil c. Beam dump: Conceptual design only d. Phase rotation channel: Decide on nominal momentum: need E-910 data analyzed! Test rf cavity in beam at BNL conceptual desing of cavity + magnets. 4. Program for years 3-n a/b. Target + Capture magnets Test target in a magnet at full field in a beam Build `final' magnets wherever possible c. Beam Dump Build beam dump compatible `final' configuration of a/b. d. Phase rotation channel Build first few meters of channel, including `final' rf and magnets. ---------------------------------------------------------------------------- 5. Needed Resources: Availble within Muon Collider Collaboration in principle: software: analysis of E-910 data + new data as generated simulation of proton/pion interactions beam transport hardware: engineering for target magnets shields RF diagnostics for target tests Not yet within the Collaboration: software: beam shock thermal analysis radiation damage MHD hardware: engineering for liquid metal systems remote handling radioactive waste ------------------------------------------------------------------- 6. What more do we need before we write an R&D proposal? a. Complete analysis of E-910: choose momentum of phase-rotation channel; firm up pion production models b. Consistent simulation of at least one scenario to be studied in years 1-2. c. Clearer plan as to where beam tests will be done. d. Clearer plan as to use of `available' magnets. e. Plan for diagnostics of beam tests, and of jet in magnet tests. f. Coordinate plans with CERN as to liquid jets. g. A plan as to how to get access to outside software resoures (beam shock, thermal, radiation damage, MHD) + some initial results if at all possible. h. A plan for interaction with liquid metal experts: Argonne, Novosibirsk, and other interested groups not yet in the Collaboration: TRIUMF... i. Budgets, timelines, personnel.....