Innovative Solutions for Thermal Neutron Beam Monitoring

 
GEM based thermal neutron
beam monitors
 
Solution 1: Head on bGEM with back
electronics – for testing
 
13 cm
 
15 cm
 
Envelope space: Detector+Electronics
(no cables or gas pipe considered)
 
Neutrons
 
15 cm
 
13 cm
 
6 cm
 
Electronics in the beam
 
This has been already realized and works well
 
Gas
Connectros
 
Solution 2a: Head on bGEM
with side electronics
 
Envelope space: Detector+Electronics
(no cables or gas pipe considered)
 
Neutrons
 
20 cm
 
20 cm
 
4 cm
 
Electronics out of the beam
 
This solution should be developed and would be new
 
Move front-end chips
out of the beam
 
FE Chips
 
Gas
Connectros
 
Sol 2 b:Head On bGEM with side
electronics
Kapton
Anode
 
Matrix 8x8
 
Pad Dimenrsion 8x8 mm
2
 
matrix dimension 64x64 mm
2
 
FPGA
 
SHIFT BOARD
 
2 mm
 
100 um
 
BEAM
 
4 Carioca Boards
64 channels
First prototype with kapton pads
No carioca board in the beam spot
Only 2 mm of material budget
 
Solution 2: Side-on bGEM  TPC like
 
Envelope space: Detector+Electronics
(no cables or gas pipe considered)
 
Neutrons
 
13 cm
 
15 cm
 
Electronics out of the beam
 
This solution has been already partially developed
 
13 cm
 
Few borated slabs inside the beam
 
This
dimension
should fit
the beam
height
 
3D reconstrucion of the beam image
 
Gas
Connectros
 
Summary
 
Cabling and Sensors
 
All detectors require
2 Gas Pipes (in/out) – 6 mm diameter
Two T/P/H sensors both on Input and Output to monitor gas
properties (temperature, pressure and humidity)
The sensors are contained in cylinders with a radius of 3 cm and an
height of 10 cm and can be positioned where there is room
HV cable (1.5 cm diameter)
16/32 Flat cables for front-end electronics
Each cable is 5 cm wide but the full envelope can be contained in a tube
of 10 cm diameter
 
Lenght of the cables to be determined
 
A bGEM beam monitor based on Solution 1 will be realized next week
Need all described infrastructures to be operated
Sol2b will be realized as the next step
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Cutting-edge detector solutions are proposed for thermal neutron beam monitoring, utilizing various configurations such as head-on bGEM with electronics, bGEM with side electronics, and side-on bGEM TPC-like setups. These solutions offer precise detection capabilities within specified envelope dimensions. Additional infrastructure requirements including cabling and sensors are outlined for successful operation of the detectors. Implementation plans for the solutions are in progress, with Solution 1 set for realization soon followed by Sol2b. The detailed summary provides a comprehensive overview of the proposed detector systems and necessary components for efficient functioning.


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  1. GEM based thermal neutron beam monitors

  2. Solution 1: Head on bGEM with back electronics for testing Envelope space: Detector+Electronics (no cables or gas pipe considered) Gas Connectros 15 cm 6 cm 15 cm 13 cm Neutrons 13 cm Electronics in the beam This has been already realized and works well

  3. Solution 2a: Head on bGEM with side electronics Envelope space: Detector+Electronics (no cables or gas pipe considered) Gas Connectros Move front-end chips out of the beam 4 cm 20 cm Neutrons 20 cm Electronics out of the beam This solution should be developed and would be new FE Chips

  4. Sol 2 b:Head On bGEM with side electronics 4 Carioca Boards 64 channels First prototype with kapton pads No carioca board in the beam spot Only 2 mm of material budget SHIFT BOARD FPGA Matrix 8x8 Kapton Anode BEAM Pad Dimenrsion 8x8 mm2 2 mm 100 um matrix dimension 64x64 mm2

  5. Solution 2: Side-on bGEM TPC like Few borated slabs inside the beam 3D reconstrucion of the beam image Envelope space: Detector+Electronics (no cables or gas pipe considered) Gas Connectros 15 cm Neutrons This dimension should fit the beam height 13 cm Electronics out of the beam This solution has been already partially developed

  6. Summary Detector Solution Envelope X (cm) Envelope Y (cm) Envelope Z (cm) 1) Head-on bGEM with electronics in the beam 13 15 6 2) Head-on bGEM with side electronics 20 20 4 3) Side-on bGEM TPC like To be adjusted to fit beam dimension 13 15

  7. Cabling and Sensors All detectors require 2 Gas Pipes (in/out) 6 mm diameter Two T/P/H sensors both on Input and Output to monitor gas properties (temperature, pressure and humidity) The sensors are contained in cylinders with a radius of 3 cm and an height of 10 cm and can be positioned where there is room HV cable (1.5 cm diameter) 16/32 Flat cables for front-end electronics Each cable is 5 cm wide but the full envelope can be contained in a tube of 10 cm diameter A bGEM beam monitor based on Solution 1 will be realized next week Need all described infrastructures to be operated Sol2b will be realized as the next step Lenght of the cables to be determined

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