Post on 07-Feb-2016
description
High-Z target test at HiRadMatProposal 1409
C. Torregrosa, A. Perillo-Marcone, F. Loprete, M. Di Castro, D. Horvath, M. Calviani (EN/STI)With feedbacks from A. Lechner, S. Montesano (EN/STI)
HiRadMat Scientific Board Meeting14th March 2014
M. Calviani - High-Z target test at HiRadMat - proposal 1409
2
Outline AD-target design and target R&D Proposed HiRadMat tests Beam requirements and experimental setup
14 March 2014
M. Calviani - High-Z target test at HiRadMat - proposal 1409
3
Introduction Target material R&D: realization of a new
target for the antiproton physics in the AD machine and for future CERN projects
Challenging regime in terms of strain rates and stresses
High-Z material mandatory for AD physics: iridium, tungsten and tungsten heavy alloys under consideration
14 March 2014
M. Calviani - High-Z target test at HiRadMat - proposal 1409
4
AD-target zone
14 March 2014
Production of antiprotons for the AD physics 26 GeV/c protons, 1.45*1013 p/pulse 60 kJ/spill 4 bunches separated by 105 ns 1.45*1013
p/spill Beam size: 0.5(H)x1(V) mm2 1s
M. Calviani - High-Z target test at HiRadMat - proposal 1409
5
Target design
14 March 2014
Modular and compact device, composed by coaxial elements: Iridium production
material Inner core is a 5.5 cm Ir,
3 mm Ø cylinder embedded into a graphite matrix
Graphite cladding Water-cooled Ti alloy
body
M. Calviani - High-Z target test at HiRadMat - proposal 1409
6
Energy density
14 March 2014
Max energy density due to beam in the target ~7.5 kJ/cm3/pulse
M. Calviani - High-Z target test at HiRadMat - proposal 1409
7
Temperature transient in Ir rod (AD)
14 March 2014
2200 C° peak temperature single pulse
Temperature gradients of 2000 C° in <1.5 mm
Ir parameters at very high temperature not know in literature
M. Calviani - High-Z target test at HiRadMat - proposal 1409
8
Strain rates
14 March 2014
Strain rates up to 4*104 s-1
Radial oscillation ~5-25 mm, max radial velocity 65 m/s
Frequency ~1 MHz
M. Calviani - High-Z target test at HiRadMat - proposal 1409
9
Radial stresses
14 March 2014
Rod centre: Compressive ~10
GPa Tensile ~6.5 GPa
External surface: Compressive
~450 MPa Tensile ~300 MPa
M. Calviani - High-Z target test at HiRadMat - proposal 1409
10
No real experience of material behaviour under these extreme conditions exists
Implicit FEM results are a coarse approximation of reality due to high dynamic stresses, high strain rates and high temperatures
Hydro-codes (collaboration with EN/MME): hydro-dynamic response of material at high
pressure and temperature HiRadMat tests with the objective to:
Cross-check with numerical results (EOS models, strength material models, etc.)
Experimental insights of material behaviour at such conditions
14 March 2014
M. Calviani - High-Z target test at HiRadMat - proposal 1409
11
HiRadMat setup Material to be tested:
6 mm Ø rods, ~100 mm long Iridium, W, WL, WRe (2 for each) + 2 nickel coated
+ CuCrZr/Ni (~10 total) Installed on rotated wheel, allowing an
alignment accuracy of ≤100 mm Upstream hBN jaws (~400 mm long, 1l) for
beam alignment, 4 planes with 2 axis Tank in inert atmosphere (He), to avoid
oxidation (either leak tight or in slight under pressure with HEPA filters)
14 March 2014
M. Calviani - High-Z target test at HiRadMat - proposal 1409
12
Preliminary tank ideas
14 March 2014
M. Calviani - High-Z target test at HiRadMat - proposal 1409
1314 March 2014
Tank design of proposal 1409 (this) and 1410 could be very similar, with similar alignment requirements and instrumentation
M. Calviani - High-Z target test at HiRadMat - proposal 1409
14
Beam requirements Pulse intensity ~1-5*1012 p/pulse Spot size: 1x1 mm2 1.5x1.5 mm2
Total number of medium-high intensity pulses: ~300-400 Ramp-up approach Other ~200 low intensity pulses could be anticipated
Integral intensity ~2*1015 POT Beam alignment/stability:
Maximum shift pulse-by-pulse ~100/200 mm Important to have it guaranteed, not only monitor
Monitor beam asymmetry ~100 mm
14 March 2014
M. Calviani - High-Z target test at HiRadMat - proposal 1409
15
Observables and instrumentation1. Radial displacement of the rods, for different
longitudinal positions Attocube FPS3010 interferometer
2. Temperature increase on the target rod Fiber-optic based pyrometers
3. Images of crack propagation and possible particle projections
Fast camera (flash need to be procured)4. Strains gauges at various longitudinal positions5. Internal cracks
Ultrasonic sensors (EMAT)
14 March 2014
M. Calviani - High-Z target test at HiRadMat - proposal 1409
16
Additional tools BLMs
Potentially standard ones installed close to the tank, hBN scan
Beam losses during alignment “button” BPMs
To be installed on the target seeing the beam to have real-time beam position on target
Resolution ~50-100 mm
14 March 2014
M. Calviani - High-Z target test at HiRadMat - proposal 1409
17
Radiation levels (TID, HEH)
14 March 2014
O(~50) kGy/experiment @20 cmO(~1013) HEH/cm2/experiment @20 cm
Rad-hard electronics close to the experimental setup
Non rad-hard in the bunker upstream the tables
M. Calviani - High-Z target test at HiRadMat - proposal 1409
18
Effect of a 7.2 us pulse HiRadMat pulse is ~15x longer than the AD-
target one dynamic response is different
14 March 2014
Long pulse reduces the radial stresses, staying in compressive state rather than oscillating between compressive to tensile
Beam parameters to be adapted
M. Calviani - High-Z target test at HiRadMat - proposal 1409
19
Radioprotection aspects
14 March 2014
PRELIMINARY Pessimistic
evaluation based on all protons reaching a single target
~100 mSv/h at 10 cm after 6 months
M. Calviani - High-Z target test at HiRadMat - proposal 1409
20
Conclusions We propose the realization of a HiRadMat
test of high-Z target materials Measurement of radial displacement and
cross-check of numerical simulations Important to assess which beam parameters
can be “guaranteed” Experiment could be foreseen for spring
2015
14 March 2014
M. Calviani - High-Z target test at HiRadMat - proposal 1409
22
HiRadMat conditions – intensity required to reach 2050 °C ~1.4*1012 p/pulse
W rod
14 March 2014