VISION ON DETECTORS. Subhasis Chattopadhyay VECC, Kolkata V. Balagi BARC, Mumbai. Detectors in DAE:- Present status. Detectors are being developed and used from the inception for detecting particles ranging from thermal neutrons to cosmic rays. Neutrons, photons,charged particles
Detectors are being developed and used from the inception for detecting particles ranging from thermal neutrons to cosmic rays
Neutrons, photons,charged particles
(light or heavy), muons, neutrinos…
Underground to nuclear physics labs,
India, Europe, USA
Solid State Physics,
High energy physics,
Special areas of interest for DAE
Reactor safety and control
Health physics instrumentation
Based on this bright present we built our vision
for luminous future
Various types of solid state detectors are used:
Surface Barrier Si, Si(Li), HPGe, Si-pad, Si-strip, CCD based
Handling Si technology for making detectors is itself a challenge
Proposals for future (one step ahead):
Large BARC charged
particle array (108 modules)
High Energy Physics:
Inner tracking with compact double sided Si-Microstrip.
CBM@GSI (big challenge next 10-15 yrs).
CCD camera for study of anisotropy in materials.
CVD Diamond and Silicon-Carbide:
(Radiation hard, Fast, Low noise, Rugged)
CVD technique is tested at various labs in DAE
Applications: Inner tracking in HEP Experiment, Reactor in-core flux monitoring, Medical Imaging
SiC: Wide dynamic range, high temp. operation (To be developed)
Si-pixel detector with amorphous Si
(Pixel detectors are to be used in ALICE)
Deposition of amorphous silicon on ASIC readout: new technology for pixel sensors (low cost, radiation hardness, thin films)
Technological issues: Deposition of high quality (low defects) thin film.
Applications: Medical Imaging, HEP Experiment.
Less sample scanning time, Solve parallax problem
using curvilinear MWPC
Neutrino observatory: Fast, good position resolution detector (RPC)
Rigorous R&D worldwide
Used in One HEP experiment.
Pos res: 57micron, timing: 12nsec
Wireless, flexible geometry, fast
233U fission counters (up to 1cps/nv)
Two clear areas emerge from DAE perspective:
Reactor program (with very stringent specifications)
Beam monitoring and other diagnostics (accelerators)
Materials study (material research is a thrust area in DAE)
reduces import component significantly (e.g. Si), Industry collaboration is crucial.
Quest of knowledge (NP, SSP, HEP, Astrophysics):
We started with smallest scale:next decades will see DAE
participating as a core member in these experimental program.
INO will be project of next decade.
A dedicated detector research facility (institute?) for DAE need
alone. Next decade should see detectors for DAE
from DAE, given the strong base we have, not a distant dream
9 keV absorption
Common theme: need of the society.
X-Ray imaging: GEM,
a-Si-films with scintillators, PSDs .
Precision radiography setup using Si.
Worldwide in large accelerator centres dedicated facilities are
being built for development of detectors for medical applications
eg. Medpix@CERN. We must have dedicated facility for R&D on
Detectors for medical applications.
My very modest contribution to physics has been
in the art of weaving in space thin wire detecting
the whisper of nearby flying charged particles
produced in high-energy nuclear collisions.
It is easy for computers to transform these
whispers into a symphony understandable
But the whispers can also be produced by radiations
widely used in biology or in medicine,such as
electrons from radioactive elements or X-rays.
In this last case it is possible to reduce,by a
large factor, the doses of radiations inflicted on the patients.”
Georges Charpak, Banquet speech,
Nobel Academy (1992)