Transcript Status of the EXL calorimeter

EXotic nuclei studied in Light-ion induced
reactions at the NESR storage ring
 Key physics issues
• Matter distributions (halo, skin…)
• Single-particle structure evolution
(magic numbers, shell gaps,
spectroscopic factors)
• NN correlations, clusters
CR
RESR
NESR
 Light-ion scattering
Elastic (p,p), (a,a) …
• New collective modes (different
deformations for p and n, giant
resonances strengths)
Inelastic (p,p’), (a,a’) ...
• Astrophysical r and rp processes
(GT, capture…)
Quasi-free (p,pn), (p,2p), (p,pa) …
• In-medium interactions in asymmetric
and low-density matter
Charge exchange (p,n), (3He,t), (d,2He) …
Transfer (p,t), (p,3He), (p,d), (d,p) …
~ 10 … ~ 740 MeV/nucleon
Collector Ring
Bunch rotation
Fast stochastic cooling
RIB
(740 MeV/nucleon)
NESR
Electron cooling
Experiments
RESR
Deceleration (1T/s) to 100 - 400 MeV/nucleon
Later stage of FAIR
EXL Set-up – Concept and Design Goals
Design goals
• Universality: applicable to a wide class of reactions
• High energy and angular resolution
• Fully exclusive kinematical measurements
• High luminosity (> 1028 cm-2 s-1)
• Large solid angle acceptance
• UHV compatibility (in part)
 Internal gas-jet target (>1014 cm-2)
 Detection systems for:
• Target recoils (p,a,n,g…)
• Forward ejectiles (p,n,g)
• Heavy fragments
Big R&D effort needed!
Phase I
EXL
EXL Gamma &
Particle Array
Recoil & Gamma
Array
EXL Silicon
Particle Array
Phase II
Challenging requirements:
• High efficiency and universality
• High angular and energy resolutions
• Low threshold
• Large dynamic range
• High granularity
• Vacuum compatibility
•…
Choice of detector types for the baseline scenario
of the EXL Recoil & Gamma Array
Energy – Position – Identification
 Si DSSD
300 mm thick, spatial resolution
better than 500 mm in x and y,
DE 30 keV (FWHM).
Mass & charge identification
 Thin Si DSSD
<100 mm thick, spatial resolution
better than 100 mm in x and y,
DE 30 keV (FWHM).
Lower thresholds
Mass identification
 Si(Li)
9 mm thick, large area 100x100 mm2,
DE 50 keV (FWHM).
 CsI crystals
High efficiency, high resolution, 20 cm
thick.
Synergy with R3B & NUSTAR.
 Design study
• Thin DSSD
• PSD with DSSD
• Integrated devices DE-E monolitic
• MAPS
• Si(Li)
• CsI and other crystals
• Vacuum chamber
Characteristics of EGPA (EXL Particle
and Gamma Array)
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Detect both gs and charged particles
Gamma sum energy, m and individual energies
95% 4P coverage, e=80% for Eg= 2-4 MeV
Stopping 300 MeV protons
DE = 2-3% for gs and 1% for fast protons
Bins in polar angle of 1o-4o for Doppler Correction
Total of about 1500 crystals of 20 cm in length
2 Phases : 1.7 + 0.6 M€ if CsI
The MUST2 Array
•Compact and efficient: bound and unbound states
• g-particle coincidences
•Examples : (a,6Be) with cryogenic target
2-nucleon transfer for pairing studies
2-proton decay measurements
IPNO-GANIL-SACLAY collaboration
MATE for Si, Si(Li) & CsI
HT
 16 ch
PA
wide
band
+/-ve
Amp
Slow
Amp
Fast
Multiplex
Disc LE
Track
Hold
TAC
6 mm
MATE
PULSER
MUFEE
Slow Control
Gain, Disc ..
Stop
M
U
L
T
I
P
L
E
X
E
R
MATE - Performance
6 mm
• 16 Channels (Fast & Slow)
– Bipolar (slow & fast)
– Slow Control
– Energy (Track & Hold)
• 1µs/3µs RC-CR
• 0.3 - 50/250MeV (1:800)
• 25/90 KeV
– Time
What is New ?
- In Nuc. Phys. Env. new
- Dynamic Range 1:800 new
- Time & Energy new
And it’s functioning !
• Disc Leading Edge
• TAC (300nsec)
• 240 psec jitter
• Chip 36mm²
– BCMOS 0.8 µ
– 16000 transistors
– 35 mWatt/channel
• Serial output 2 MHz
R&D Detection Group
http://ipnweb.in2p3.fr/~rdd
Head : Joel Pouthas
5 Engineers
3 Technicians (Mechanics)
2 Technicians (Electronics)
4 Technicians (Assembling Detectors)
1 Secretary (part time)
Gaseous Detectors
Wire Chambers, MPGD
ALICE @ CERN
HADES @ GSI
Scintillators
Photomultipliers
G0 & DVCS @ Jefferson Lab
P.AUGER Observatory
3 Clean Rooms
3D measuring Machine
Jefferson Lab.@ Newport News
Mechanics
DVCS / CLAS
Inner calorimeter
(PbWO4)
424 crystals, 160 mm long,
APD readout
PROTOTYPE 100
Crystals
2002
R&D
2003
Construction of a prototype
2004 (Jan) Prototype test on beam
2004
Final design and construction
2005 (Mar) Experiment
Jefferson Lab.@ Newport News
DVCS / CLAS
Geant 4 simulation
Simulation
Electromagnetic
Shower
2 GeV electron
Jefferson Lab.@ Newport News
DVCS / CLAS
GSI @ Darmsdat
PANDA / EM Calorimeter
Studies
Mechanics
Thermal
Integration
Simulations
Geant 4
R&D Prototypes
Beginning of studies
September 2004
GSI @ Darmsdat
PANDA / EM Calorimeter
Carbon Cells
GSI @ Darmsdat
EXL
A Few Questions to Address
• Do we need 2 calorimeters for EXL and R3B?
• Why does the EXL calorimeter have 1500 modules and the
R3B 10000?
• Do we need sum energy for EXL applications? (i.e how
important is 4P coverage?)
• Is CsI the best material? (see Jürgen Gerl’s talk). Do we
need cooling?
• Will APDs give sufficient dynamic range, or do we need
PMTs?
• Does EGPA need vacuum?
• ….
How can we (IPNO) help answer
• Produce a first complete realistic mechanical design.
Engineering time will be available starting october.
• Do detailed Géant 4 simulations of some specific
experimental situations (A post doc, Flore Skaza, has been
hired for one year and will start in sept.)
• Do studies on materials?
• We are willing to contribute to both EXL and R3B.
• We need to co-ordinate with other groups and labs.