R3B Status Report - GSI WWW-WIN

T. Aumann (GSI)
NuSTAR Annual
Meeting 2009
R3B Status Report

Calorimeter
Target-recoil
detector
Diamond- and Si-Strip detectors
NeuLAND
Largeacceptance
mode
High-resolution mode
NeuLAND
Kinematically complete measurement of reactions with high-energy secondary beams
Nuclear Astrophysics
Structure of exotic nuclei
Neutron-rich matter
Reactions with Relativistic Radioactive Beams
alternative: active target
alternative: multi-track detector

RIB from
Super-FRS
Reactions with Relativistic Radioactive Beams
• Target
• Tracker
• Calorimeter
R3B Start version:
2014
Large
acceptance
dipole magnet
Protons
Heavy
fragments
Neutrons

new: beam
tracking with
Diamond detectors
Extended Experimental Setup at Cave C@GSI
new: proton tracking
around the target with
Si-strip detectors
new: proton tracking
Exclusive measurement of all interesting reaction channels
- knockout plus decay of residual system
- inelastic excitation plus proton decay (nuclear, electromagnetic)
- quasi-free scattering: (p,2p) (p,pn) (p,pα)
behind magnet with drift chambers

Diamond tracking detectors (TU München)
Large-area prototype New APV-front-end board for 128 channels
Two-dimensional amplitude scan of a 50 µm
segmentation gap (left), and its y-projection
Position correlation of two
diamond strip detectors (200 µm)

Si-strip detectors – Test 8 B breakup to 7 Be + p
• AMS type detectors
• DSSDs, 300 µ m thick, 41 × 72 mm2
• Strip pitch 100 µm
• Readout chips – VA64HDR9a (64 ch,
very low power dissipation)
• Energy resolution – 50 keV
• Dynamic range – 100 keV - 14 MeV
• 1024 readout channels/detector
• Designed to work in vacuum (total
power dissipation < 3 W/detector)

Quasi-free scattering in inverse kinematics
Measurement of proton recoils after knockout reactions with a CH 2 target
projectile Z,A
• kinematical complete measurement of
(p,pn), (p,2p), (p,pd), (p,a), .... reactions
• redundant experimental information:
kinematical reconstruction from proton momenta
plus gamma rays, recoil momentum, invariant mass
• sensitivity not limited to surface
→ spectral functions
→ knockout from deeply bound states
• cluster knockout reactions
CH2
target
n,p, ...
proton
CsI, NaI
Si, strip
x, ∆E
B

Deviation from the independent-particle picture:
Correlations: Configuration mixing,
Coupling to collective phonons
Short-range correlations → high momenta
→ reduced single-particle strength
(occupations, spectroscopic factors)
single-particle structure

Spectroscopic factors for
neutron-proton asymmetric nuclei
weakly bound
nucleons
Figure from Alexandra Gade, Phys. Rev. C 77, 044306 (2008)
strongly bound
nucleons
?
Origin
unclear
isospin
dependence
of
correlations
?

Subedi et al.
Correlations in asymmetric nuclei
and nuclear matter
ρ = 0.32 fm −3
protons
ρ = 0.16 fm −3
Electron-induced
knockout (JLab)
neutrons

• box of DSSDs for
proton tracking
• polar angle coverage ≈
15°≤ θ ≤ 80°
• resolution: ∆x ~ 100
µm; ∆E ~ 50 keV
• range: 100 keV < E < 14
MeV
Experimental Setup: LAND@Cave C
Target
Beam
“New” Target Recoil Detector for Quasifree Scattering
• Crystal Ball detector
• 162 20cm long NaI(Tl)
crystals
• additional low gain
readout of forward 64
crystals
• 4π gammas
• 2π light particles

Setup for quasi-free scattering experiment
Pilot Experiments:
12 C, 17 Ne beams around 500 MeV/u
(p,2p) reactions in complete kinematics
plus detection of projectile-like fragments/ejectiles
→ Test of principle
→ Physics of 2p-halo nucleus

• Frontend electronics of CB
crystal:s now with addtitional
low gain readout:
New Crystal Ball Readout
for (p,2p) Protons: Design & Tests
Test: CB NaI crystals with ~ 200 MeV protons
new!
200 ns
1000 ns
250 mV
3 mV
88 Y signal as in the two readouts
NaI crystal (L=20cm) setup
Counts
Measurement
E 0 = 451 MeV
∆E = 142 MeV
σ = 4.5 %
E 0 = 237 MeV
∆E = 237 MeV σ = 1.4 %
ε ≈ 40 %
Raw Energy / QDC ch.
• NaI Crystals absorb protons with
energies up to 274 MeV
• Energy resolution of σ = 1.5% for
~200 MeV protons
• Full energy peak efficiency ≈ 40%
Felix Wamers (GSI)

Nucleus of interest Excited Fragment
q
A
Bound Proton
0
Free Target Proton
Internal Momentum
= − p −1
Recoil q
q A = p + p −
1
2
Quasifree Scattering with Exotic Nuclei
p
2
0
1
A-1
Separation Energy
Photon(s)
Scattered Protons:
ES = T1
+ T2
+ TA−1
Evaporation
p,n,d,t,...
•≈ opposite ϕ angles
• opening angle ≈ 90°
Pilot experiments with 12 C, 17 Ne and Ni
isotopes already performed in Cave C are
under analysis …
Correlations in Crystal Ball for 17Ne(p,2p) 16F ∆θ ∆θ=180°, ∆θ
∆φ ∆φ=83° ∆φ
(as for free pp)
Felix Wamers (GSI)
−T
0
(p,2p), (p,pn), (p,pα) to study:
• single particle structure (valence and
deeply bound nucleons)
• clustering
• nucleon-nucleon correlations

PhD Stefanos Paschalis (Liverpool)
Quasifree n knockout reaction
with a 57 Ni radioactive beam
57 Ni (p,pn) 56 Ni at 500 MeV in inverse kinematics
1 hit in plastic
(p)
2 hits in CsI
(p+n)
typical
angular
correlations

Experiment S174: Proton elastic
scattering (P. Egelhof et al.)
6 He + p → α + p' + X
L. Chulkov et al., NPA 759(2005) 43
Quasi-free cluster knockout
Momentum distribution
Spectroscopic factors:
neutron: 1.7(2)
alpha: 0.8(1)

R3B Si Recoil Tracker WG
Tasks:
• Simulations of target-recoil detector
• elastic, inelastic, quasifree …
• Si-microstrip prototype testing
• micro-strip, MAPS …
• Si tracker mechanical design
• Mechanical integration of target-recoil detector sub-systems
• with LH2 target and calorimeter
• FEE and DAQ
Fully funded in UK
• £5M project inc. capital, manpower …
• project starts 1 April 2009
• Installation at R3B in 2013
R3B conceptual design
for Si tracker FEE and DAQ
NUSTAR
DABC
DAQ
BUTIS
R3B
input
code
module
• 100k channels, new ASIC design (low thresholds, self-triggering)
• Si-tracker construction, assembly and installation
• Liverpool Semiconductor Centre (ATLAS, LHCb, etc)
• Si-ladder assembly testing
fibre
links
Gbit Ethernet fibre(s)
BUTIS
Fan-out
either fibre
or HDMI links
Si Ladder
DSSD
FEE
Card
ASIC
ASIC
Handles
16 ASICs,
each 64ch
= 1024ch.
Total approx
100 FEE cards
Slow
Control
Fibre
Ethernet
WG Coordinator: Roy Lemmon – STFC Daresbury Laboratory, UK

~130 ~40
Beam
CALIFA/R3B R&D status
General design of the detector based on kinematical considerations
BARREL
~20
FORWARD
ENDCAP
Crystal and photosensors
WG coordinator: D. Cortina-Gil (SAntiago de Compostela)
Barrel CsI+APD
“Egg” shape
Highly segmented
Thick detection volume
Scintillation based
performant photo-sensors
1cm 3 and 662 keV γ
Real shape, 1MeV γ
∆Ε/Ε ∼5 %
13 cm

CALIFA/R3B R&D status
WG coordinator: D. Cortina-Gil (SAntiago de Compostela)
Forward Endcap Phoswich solution is being investigated
Engineering design and Mechanical structure based on carbon fiber

250
Φ 500
Test in
SCHEMA
1200
Large Acceptance Dipole Magnet
• Superconducting cable (18 km) produced, delivered & controlled : OK
• Thermo-mechanical parameters measurements on coil samples and halfscale
mock-up (coil + coil casing) performed at cryogenic temperature,
• R&D on Thermosiphon with quasi-horizontal tubes: positive conclusions,
• New simplified magnetic design in order to get a mechanical structure that
contains the high level of magnetic forces (300 to 400 t/m) and controls the
shear stresses inside the coils (< 20 MPa). (figure ->)
• This design also provides mechanical and superconducting stability to the
magnet, with a good blocking of the coils at cold temperature (4.5 K), and
ensuring the required temperature margin (> 1.5 K)
• PRR in July 2008 : Cold Mass design Review : Specifications approved
• Cold mass ordered, end of 2008 – Delivery planned for January 2010.
The market includes Coil windings + coil casings & blank assembly +
precise integration 1 of the 6 coils in their boxes.
• Ongoing schedule:
– Cryostat design, review (T3 2009) & order (T4 2009)
– T4, 2009: Mock-up test with current @ 4.5 K in SCHEMA facility
– T2, 2010: Cold mass and MSS test in W7X cryostat (figure ->)
– 2011: Integration 2 in the final cryostat
– 2012: Installation @ GSI-FAIR
B. Gastineau,
CEA Saclay

σ t
σ x,y,z
σ E*
size
area
# ch.
weight
< 100 ps
≈ 1 cm
20 keV
2 x 2 x 0.8 m 3
~ 140 m 2
~ 10.000 channels
~ 15 t
Neutron detector NeuLAND
Working group coordinator: K. Boretzky (GSI)
detection principle based
on
Resistive Plate Chambers
plus
iron converters
status:
proof of principle: RPC excellent for slow protons
prototypes with included converter as electrodes:
efficiency of 99%, time resolution ~50 ps
next steps:
test with neutrons in 2009 and full size prototype in 2010
4×50 cm
200 cm

Requirements:
Large Area ToF-wall for heavy ions: iToF
Conceptual design
RPC technology
Cu
tape
adapted to heavy ions
time resolution:

R&D prgress: Technical Design and Status Reports
R3B: Status March 2009
NeuLAND neutron detector: Technical Status Report of November 2008
(attached to German funding applications)
TDR will be issued in Q4 2010
CALIFA calorimeter: Technical Status Report of November 2008 (attached to German application)
TDR barrel part in Q1 2010, TDR forward cap Q2 2011
Target Recoil Detector: entire R&D and construction by UK groups,
detailed project plan, regular reporting foreseen for UK funding, ready by 2013
Heavy-Ion Tracking: TSR available for diamond detectors (attached to German application)
RPC ToF wall TSR available (final EURONS report)
GSI Si-strip detectors (final EURONS report)

Time Plan
2009-2010: remaining R&D and prototyping
2011: Start production
2011 (Q4): 20% of CALIFA and NeuLAND ready
2012: Experiments with R3B detectors in Cave C
2013: Setting up in R3B hall
2014: Commissioning of full setup, first experiments
R3B: Time Plan and funding
Funding situation:
✔ 5.5 MEuro (3.0 EU + 1.5 GSI + 0.5 CEA) (Dipole)
✔ 0.7 MEuro (+ R&D+Menpower) UK (Recoil Detector)
►BMBF application German universities
►BMBF project application (GSI)
open: Spain, Sweden, India, Russia, China, Poland
Proposal spectrometer: MSU, GSI, Berkely, Tennessee;
RIKEN