Development of the optical module’s prototype for ArgonCube

ArgonCube LAr TPC concept

5x5 WLS fiber’s
bundle
d = 1,2 mm
Design of the optical module prototype
White reflective plate
SiPM
(6x6 mm)
TPB coated plane of WLS-fibers
module size can be changed optionally
(for the first tests it will have 30 cm length and 11 cm width)
fibers clamps

The mechanism of light collection
128 nm
LAr scintillation light
TPB on fibers shift 128 nm -> 425 nm
WLS-fibers shift 425 nm -> 510 nm,
510 nm light is detected by SiPM

SiPM size - 6x6 mm (57600 pixels)
Performance of Hamamatsu SiPM S13360 - 6025CS in liquid nitrogen
Spectrum of SiPM
at room temperature
Spectrum of SiPM
at liquid nitrogen temperature (-196 deg. of C)
PDE (at 510 nm) ≈ 24 %

LED source
LED WL=428 nm
Light diffusing by Teflon (PTFE) layer

LED stability
Amplitude variations < 2%
High light intensity ~ 103 ph.e
Low light intensity ≈ 1.75 ph.e
Fluctuations are mainly driven
by statistical accuracy
LED source stability measured by
20’’ Hamamatsu 12860 HQE PMT in a single point

LED calibration scheme
generator
self-stabilized LED (425 nm)
controller
PC
trigger
ADC
DRS4
PC
AMP
k=10
power
supply
trigger
signal
PMT H6780
QE ~ 18%
power
supply
dark room

generator
self-stabilized LED (425 nm)
controller
PC
trigger
ADC
DRS4
PC
AMP
k=16
power
supply
SiPM
power
supply
trigger
signal
Room temperature testing scheme
dark room

Room temperature testing scheme
LED source

Results of testing under room temperature conditions
1 part
2 part
self -
stabilized LED
N ~ 280 photons
mirrored faces

Light guide fiber calibration scheme
generator
self-stabilized LED (425 nm)
controller
PC
trigger
ADC
DRS4
PC
AMP
k=16
power
supply
trigger
signal
light guide fiber
PMT H6780
QE ~ 18%
power
supply
dark room

generator
self-stabilized LED (425 nm)
controller
PC
trigger
ADC
DRS4
PC
AMP
k=16
power
supply
SiPM
power
supply
trigger
signal
light guide fiber
isothermal container
Nitrogen low temperature testing scheme
-192°C

Nitrogen low temperature testing scheme

Results of testing under liquid nitrogen conditions

The advanced prototype design
Maximum thickness ~ 10 mm (place to install SiPM )
The rest thickness of module ~ 6 mm
The ends of the optical fibers will be round that will give us to increase the light yield ~ 20 %

Assembling of prototypes
The next step will be to assemble the detector, what consist of 4 similar module
The size of the assembling will be 30*40 mm