UGC DAE Consortium for Scientific Research
Kolkata Centre
(Formely Inter University Consortium for DAE Facilities)
LB/8, Sector-III, Bidhan Nagar, Kolkata-700098
Ph. No. 033-2335-1866 Fax No. 033-2335-6543, 2335-7008.
Specifications of Charged Particle detectors.
1
A
(A.i)
(A.ii)
B
Detector Telescope for light charged particle spectroscopy
2
Double Sided Trapezoid detector
Si detectors – fully depleted transmission type detectors of :
3 nos each
Thickness ~ 200 m & area 100 mm2
2
3 nos each
Thickness ~ 500 m and area ~150 mm
Partially depleted Stop detectors with depletion depths of 2 3 nos each
mm and area 200 mm2
All the detectors are with radial mounted micro-dot connectors(F) with expected
resolution ~20 keV or better for ~ 5.4 MeV alpha particles
6 nos
o
DSSD (Double-Sided Silicon Detector) 60 wedge detector
Active Area: 80 cm²
No of Channels: 24
Side Length: ~ 16.0 cm
Window: Type 2M (<1µm)
Subtends 60° (17 mm to 135 mm radius)
Connector: DL 50-way
16 junction (radial) strips, pitch ~ 6.5 mm
8 ohmic sectors, each subtending ~ 7°
2 guard rings
24 grounds
Package: PCB Transmission (1.6 mm thickness)
Detector thickness: 150 µm
Full Depletion (FD): ~ 30V max
Total Leakage Current (FD+30V) (20ºC): 3 uA max
Operating Voltage: FD to FD+30V
Total Alpha Resolution (Junction): 300 KeV FWHM 1 µS TC max
Total Alpha Resolution (Ohmic) 300 KeV FWHM 1 µS TC max
Minimum Acceptance level: 100% (all channels operational)
Thickness 150 m
3
Silicon Pad detector
Depletion depth of 100 m.
Active area is 40.0 (mm) x 15.0 mm
Chip dimensions 43.0 mm x 18.0 mm
Appropriate guard ring to be provided
Preferably packed as a ready to mount PCB with minimal dead
Layer / volume, or in a chip format.
Vendors to specify the expected performance (energy
resolution).
12 nos,
4
CsI(Tl) detectors for use in vacuum
25 nos
CsI(Tl) detectors (integral assembly with photo-diode and preamplifier) for
charged particle detection to be used in vacuum (preferred heat dissipation of
50 mW per unit. Vendors may quote the expected heat dissipation.)
20 x 20 x 2 mm Csl(Tl) Scintillation Detector with a 2 -3 micron aluminized
mylar entrance window.
Coupled via a light guide to a 10x10 mm active area PIN photodiode with a
size of 12.7 x 14.5 mm (S3590-08 or eq)
The photodiode is coupled to a hybrid charge sensitive preamplifier
The charge sensitive pre-amplifier should have a 50  impedance
The pre-amplifier should be operated from a + 6 - +12 V power supply
The detector should have an operating bias of around 50 V , with a current of a
maximum 1nA and the maximum permissible operating voltage should be
+100V
The energy resolution should be 5-6% (fwhm) for 241Am alpha particles.
The entire assembly is enclosed/ encapsulated in a compact housing .
Vendors may also quote for an alternate (square) shaped encapsulation.
The connections should be with provided with flying leads for signal, power
supply (pre-amplifier and bias) and a ground and a maximum of 50 cm cable
length (minimum 20 cm in length).
It is preferred that the cables be brought out from the rear.
However, the vendors may provide for an alternate configuration for the
cables.
The rear housing plate should have 4 M6 blind tapped holes to couple the
housing to the mounting structure.