Martin Winkler, DP NUSTAR 14-4-05 DIRACsecondary Beams Design Project NUSTAR Research Field and Production of Exotic Nuclei The NUSTAR Facility and the Super-FRS List of Tasks for the DP NUSTAR Implementation Plan Summary of Project Resources and Budget Martin Winkler Kick-off meeting EU DS "DIRACsecondary- Beams", April 14-15, 2005, GSI, Darmstadt, Germany NUSTAR := Nuclear Structure, Astrophysics and Reactions
17
Embed
Martin Winkler, DP NUSTAR 14-4-05 DIRACsecondary Beams Design Project NUSTAR Research Field and Production of Exotic Nuclei The NUSTAR Facility and.
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
Martin Winkler, DP NUSTAR 14-4-05
DIRACsecondary Beams Design Project NUSTAR
Research Field and Production of Exotic Nuclei
The NUSTAR Facility and the Super-FRS
List of Tasks for the DP NUSTAR
Implementation Plan
Summary of Project Resources and Budget
Martin Winkler Kick-off meeting EU DS "DIRACsecondary-Beams",
April 14-15, 2005, GSI, Darmstadt, Germany
NUSTAR := Nuclear Structure, Astrophysics and Reactions
Martin Winkler, DP NUSTAR 14-4-05
NUSTAR = Nuclear Structure, Astrophysics and Reactions Key-Results from FRS Experiments
B =4MeVF
r-process
B =0n
B =0p
New Fission Studies
New Mass Measurements
2-p Radioactivity
Halo Nuclei
Bound-state --decay
Pionic Atoms
New Fission Fragments
Shells far off Stability
Skin Nuclei
100Sn
78Ni8B
11Li
Giant DipoleResonance
NP A665 (2000) 221
NP A667 (2000) 75
EPJ A14 (2002) 279
PRL 86 (2001) 5442
PRL 91 (2003) 162504
to be published
PL B 444 (1998) 32
PRL 88 (2002) 122301NP A720 (2003) 3
PR C65 (2002)064603
Martin Winkler, DP NUSTAR 14-4-05
Production of Exotic Nuclei at Relativistic Energies
fissionpf VVV
P rojec tile Fragmentation
P ro jec tile F is s ion
Projectile
Projectile
Target
Target
ProjectileFragm ent
Nuc le o n-Nuc le o n-C o llissio ns (Ab ra sio n Ab la tio n)
pf VV
C o ulo m b Exc ita tio n in Pe rip he ra l C o llisio ns
FissionFragm ents
Xe fragmentationU projectile fission238
129
EPAX
Fragment Mass Number A
cro
ss s
ect
ion
(b
arn
)
K.Sümm erer
Martin Winkler, DP NUSTAR 14-4-05
Advantages of Projectile Fragmentationand – Fission at Relativistic Energies (0.5-1.5 GeV/u)
• Chemistry independent separation Secondary beams of all elements
• Fast separation and transport to the experimental devices
(less than s) Providing secondary beams of short-lived isotopes
• Kinematical focusing Efficient injection into separators and storage rings
• Full unambiguous Z-identification due to high velocities
• Quasi-continuous secondary beams or alternatively short-
pulsed beams
• Option for beam cocktail of isotopes of similar A/Z
Martin Winkler, DP NUSTAR 14-4-05
The NUSTAR-Facility at FAIR
Phase 1
Martin Winkler, DP NUSTAR 14-4-05
40
20
0
-20
-40
-0 .1 -0 .05 0 0 .05 0 .1
/
mra
d
-0 .1 -0 .05 0 0 .05 0 .1
40
20
0
-20
-40p/p
0 .00
0 .01
0 .02
0 .03
0 .04
0 .05
F ragm en ta tion
F iss ion
Energy / (M eV /u)
/ m
rad
200 500 1000 15000
5
10
15
20
25
30
F iss ion
F ragm en ta tion
238 78U + C N i - (F iss ion)
238 13 2U + C Sn - (F ission)
124 1 00Xe + C Sn - (Fragm entation)
40
20
0
-20
-40
-0 .1 -0 .05 0 0 .05 0 .1
p/p
Design Parameter of the Super-FRS
Emittance x = y 40 mm mrad
Angle acceptance
- Horizontal x ± 40 mrad
- Vertical y ± 20 mrad
Momentum acceptance p/p ± 2.5%
Maximum magnetic rigidity Bmax
- High-energy branch 20 Tm
- Ring branch 13 Tm
- Low -energy branch 10 Tm
Ion-optical resolving power (1st order) Rion 1500
Design Parameters: Goal: Larger Acceptance
Martin Winkler, DP NUSTAR 14-4-05
Design parameters and layout of the Super-FRS
• Multi-Stage
• Super Conducting
• Large-Acceptance
• Multi-Branch
Martin Winkler, DP NUSTAR 14-4-05
Separation performance with two degrader stages100 Sn produced by fragmentation of 124Xe at 1000 MeV/u
• Introduction of another separation cut in the A-Z plane of the separated isotopes• Reduction of the contaminants from fragments produced in the first degrader• Optimization of the fragment rate on the detectors in the Main-Separator • Pre- and Main-Separator can ideally be used for secondary reaction studies if the separation of the Pre-Separator is already sufficient
• M6-1: Concept for rotating target wheel, 12/2006*
Martin Winkler, DP NUSTAR 14-4-05
NUSTAR1: High-Power Production Targets(Feasibility Study and Prototype Construction of a Liquid Metal Jet)
Key parameters for fast extracted beams:• pulse length 50 ns beam interaction with nominal target thickness• instantaneous power: 12 kJ/50 ns 240 GW• small beam spot (x=1mm, y=2mm) high power density
windowless liquid-metal jet target
Critical aspects: Damage due to shock waves?Thickness and density homogeneity of the jet, re-formation after rupture Efficiency of removing induced radioactivity from the jet Safety of operation
Geometry at target area Energy deposition distribution
(calculated with PHITS)
Milestones:
• M7-1: Decision on insulating material, 10/2005*• M7-2: Delivery of model coil, 9/2006*• M7-3: Design and test for Surveying and alignment system ready, 4/2007*• M7-4: Prototype Magnet delivered, 12/2007*
Martin Winkler, DP NUSTAR 14-4-05
NUSTAR3: Large-area beam tracking detecors for fast extracted beam
• x, y: position measurements• x', y': corresponding angle measurements• E and TOF for particle identification
Task:• Measure ion trajectories for p to U• High intensities large amount of deposited charge• Short beam pulses
Proposed Solution:Devoloping of a Beam Chamber Detector - chamber readout consists of integrated delay lines with inputs connected to the cathode wirdes- use of adjustable preamplifiers - work under variable pressure conditions (<1mbar – 1bar)