Martin Winkler, DP NUSTAR 14-4-05 DIRACsecondary Beams Design Project NUSTAR Research Field and Production of Exotic Nuclei The NUSTAR Facility and

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


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


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


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


The NUSTAR-Facility at FAIR

Phase 1


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


Design parameters and layout of the Super-FRS

• Multi-Stage

• Super Conducting

• Large-Acceptance

• Multi-Branch


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

1 stage separator (FRS)2 stage separator (Super-FRS)


List of Tasks: Overview

Task No

(short title) Topic

6 NUSTAR1 High-power production targets

7 NUSTAR2 Radiation-resistant magnets

8 NUSTAR3 Detector development

9 NUSTAR4 Ion-optical design studies and application

10 NUSTAR5 Stopping cell dvelopment


NUSTAR1: High-Power Production Targets(Concept for a Rotating Target Wheel)

Key parameters:

• radiation cooled• continuous reliable operation (≈ 1 year) • safe handling concepts needed (plug system, vertical access)

Facility Beam

Total Beam PowerP [kW]

Graphite Target

Thickness[g cm-2]

DepositedPower

ΔP [kW]

SpecificPowerΔP/M

[kW/g]

Super-FRS all ions < 38 4 - 8 < 12 < 0.15

PSI P 1000 10.8 54 0.18

RIKEN/BigRIPS all ions < 100 1 < 20 0.81

SPIRAL-II D 200 ~ 0.8 200 ~ 0.25

Target E at PSI

Milestones:

• M6-1: Concept for rotating target wheel, 12/2006*


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

Milestones:• M6-2: Conceptual Design of liquid-metal jet target, 12/2007*• M6-3: Liquid-metal jet target prototype ready, 12/2007*


NUSTAR2: Radiation-Resistant Large-Aperture Magnet

E>/M= 0.46 mJ/g (quench limit: 2-3 mJ/g)

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*


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)

Milestones:

• M8-1: High-Flux beam chamber prototype delivered, 8/2007*


NUSTAR4: Ion-Optics & Application

NUSTAR5: Superfluid-Helium Stopping Cell

Experiments with Low-Energy and Stopped Beams

Milestones:

• M9-1: Beam-distribution prototype delivered to GSI, 8/2007*• M10-1: Key parameters of stopping cell defined, 1/2006*


Participating Laboratories and Institutes in the DP NUSTAR

Participant number

Organisation Country Acronym Coordinator

1Gesellschaft für Schwerionen-forschung Darmstadt

D GSI M. Winkler

7 Justus-Liebig Universität Giessen D Giessen W. Plass

16 Technische Universität Dresden D Dresden H. Quack

19 Forschungszentrum Karlsruhe D FZK R. Stieglitz

20 Philipps Universität Marburg D PUM W. Ensinger

21 Fachhochschule Mainz D FHM F. Boochs

22 Babcock Noell Nuclear (industry) D BNN M. Gehring

23 Comenius University Bratislava SK CUB B. Sitar

24 University of Surrey GB UOS Zs. Podolyak

33 Jyväskyla Yliopisto Fysiikan laitos FIN JYU J. Äystö


Multi-annual implementation plan of the DP NUSTAR


Summary of Project Resources and Budget of the DP NUSTAR

Manpower / [PM] Investment / [k€] Part. Numb.

Organisation Task Contrib. EU Requ. Contrib. EU Requ.

Expected budget

[k€]

Request [k€]

NUSTAR1 24 24 63 63 462 231

NUSTAR2 16 15 277 284 778 389

NUSTAR3 6 0 0 0 42 0

NUSTAR4 6 0 0 0 42 0

1 GSI, Darmstadt

NUSTAR5 6 0 0 0 42 0

7 JLU, Giessen NUSTAR4 66 36 0 17 432 196

16 TUD, Dresden NUSTAR2 3 3 0 0 30 15

19 FZK, Karlsruhe NUSTAR1 24 24 70 70 492 246

20 PUM, Marburg, D NUSTAR2 9 9 0 0 96 48

21 FHM, Mainz, D NUSTAR2 21 18 0 8 209 104

22 BNN (Industry partner)

NUSTAR2 2.5 2.5 0 0 66 33

23 CUB, Bratislava NUSTAR3 90 0 0 66 334 91

24 UOS, Surrey NUSTAR4 12 12 0 0 120 60

33 Jyväskylä NUSTAR5 12 0 0 13 67 27

Total: 297.5 143.5 410 521 3.212 1.440

Documents

Martin Winkler, DP NUSTAR 14-4-05 DIRACsecondary Beams Design Project NUSTAR Research Field and Production of Exotic Nuclei The NUSTAR Facility and