FP6 Design study "DIRAC secondary beams" Project "NUSTAR":Experiments with stored radioactive beams Super-FRS high-power production target has to cover two totally different regimes: 1. Slow extraction: ≈ 1 second spills, P = 12 kW 2. Fast extraction: ≈ 50 ns spills, P = 12 kJ/50 ns = 240 GW! Task 6: High-power production targets for fast- extracted beams K.Sümmerer (GSI)
9
Embed
FP6 Design study "DIRAC secondary beams" Project "NUSTAR":Experiments with stored radioactive beams Super-FRS high-power production target has to cover.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
FP6 Design study "DIRAC secondary beams"
Project "NUSTAR":Experiments with stored radioactive beams
Super-FRS high-power production targethas to cover two totally different regimes:
1. Slow extraction: ≈ 1 second spills, P = 12 kW
2. Fast extraction: ≈ 50 ns spills, P = 12 kJ/50 ns = 240 GW!
Task 6: High-power production targets for fast-extracted beams
K.Sümmerer (GSI)
FP6 Design study "DIRACsecondary beams"Project "NUSTAR":Experiments with stored radioactive beamsTask 6: High-power production targets for fast-extracted beams
PSI target for slow extraction(G.Heidenreich, PSI)
PSI Target E Vertical plug handling concept at Super-FRS
Work plan for NUSTAR1 / Task 6
Rotating graphite wheel target:Explore theoretical concepts of energy deposition/transportEngineering design Calculate temperature response of realistic geometry Prototype for long-term/beam testingRadiation damage/annealingMedia connection, shielding, handling, repairs
GSI
Super-FRS targets for fast extraction
Key parameters:
•pulse length 50 ns ( beam interaction with nominal target thickness)•instantaneous power: 12 kJ/50 ns 240 GW•small beam spot & high power density solids not (always) feasible
Possible solutions:
1. graphite wheel as fall-back solution for low beam powers/larger beam spots
Liquid Li seems to be the most favorable metal!Open questions:damage due to shock waves?Li contamination of beam tube, diagnostic detectors etc.constancy of jetsafety issues
Response of liquid-Li jet to fast SIS pulses
2-dim. BIG-2 calculations by N. Tahir:Tmax on beam trajectory: 13 000 Kevaporated Li is ejected in/against beam direction with v0 = 10 km/sshock front travels with 1.5 km/s perpendicular to beam directionshock pressure still 2 GPa after 1 μs
to = 50 ns t1 = 1 μs
Work plan for NUSTAR1 / Task 6
Liquid-metal jet target:3-dim. hydro-dynamical calculations; comparison to
2-dim. calculationsDefine beam spot size where Li does not vaporizeFeasibility study (water model, Na model)Prototype Li loopTechnical (safety and vacuum) concept (incl.