DArT-2 Tests and Experiments Overview

 
DArT-2 tests
 
Luciano Romero, Ludovico Luzzi, José Manuel Cela
DArT Collaboration meeting
27-July-2022
 
DArT-2 tests
 
DArT-2 and DArT-Test are twin experiments.
DArT-Test to give information about the operation and problems of DArT-2
DArT-2 to operate in ArDM to study the underground argon
The main objective of the tests described here is to guarantee the
performance of DArT-2
During construction and operation
Types of tests
Electronic test of the PDMs
Vacuum test to check leaks.
Physic test
39Ar measurement
Alphas measurement
 
Electronic tests of the PDM
 
IV curve of the SiPM at room temperature (RT)
IV curve of the SiPM at cryogenic temperature (CT)
Dark current rate (CT) (noise)
Finger plot of dark current (CT) (gain)
Finger plot of LED driven light pulses (CT) (gain)
 
This set of measurements guarantee the correct operation of the
PDMs and of the DAQ
 
Electronic tests of the PDM
 
First test already done on PDM reception
One PDM rejected (#70)
9 working properly
Presented on 6 of July of 2022
Second test to be done with the PDM mounted in DArT-2
To mininize connection/disconnection of PDM (risky)
Light tight enclosure.
No need of vacuum tightness.
Vessel cooled with liquid nitrogen at atmospheric pressure
Using a provisional small cryostat
DArT-2 vessel filled with gaseous nitrogen or dry air.
Test noise with definitive power supplies
Any problem can be easily fix.
Subsecuent tests to be done with DArT-2 inserted in ArDM
ArDM and DArT-2 filled with cold gaseous argon
ArDM and DArT-2 filled with cold liquid argon
 
 
Vacuum test of the vessel
 
First test to be done at RT with a provisional teflon seal.
At room temperature
To assure the quality of the soft copper weldings
Second test to be done after DArT-2 assembly.
At room temperature
Once the PDMs have been validated
With definitive vessel seal made of 3 mm indium wire.
Subsecuent cryogenic tests with DArT-2 mounted within ArDM
Do not flash cool the vessel (See next slide)
 
 
Vacuum problems in DArT-Test
 
We poured LN2 into the cryostat containing DArT-Test
The entire copper vessel is cooled very fast by the LN2
Due to the high heat conductivity of the copper: 385 W/(mK)
The top flange is not cooled so fast
It is cooled by the vessel through the indium seal
Let assume a momentary difference of temperature of 100K between
flange and vessel.
The maximum displacement between flange and vessel is:
17 10
-6
 K
-1
 x 100 K x 0.12 m = 0.2 mm
Enough to weak the indium seal
Use conical springs to assure the sealing of the indium wire
 
Physic test
 
Vacuum and PDM tests done before.
Need liquid argon inside DArT-2
Physics test are to be done within cold ArDM
Not possible to do it in the current test cryostat (See next slide)
Let ArDM be filled with cold argon gas
To avoid time consuming filling of LAr
1 option: Condensate the liquid argon inside DArT-2
Increasing the argon pressure in DArT-2
Its no clear if the heat dissipation by gas convection allow the filling in a reasonable
time.
2 option: Fill DArT-2 directly from a LAr commercial range
Through the thin (CF16) gas connection
 
Why is not possible to use the current
cryostat to do physics test
 
The original design use SAGANA D22
ferrules to join DArT to the gas system
The use of ferrules was discarded
because of vacuum leaks.
In current design DArT is welded directly
to a CF40 flange
Old design allows the coupling of DArT to
the cryostat flange
The ferrule goes through the 40 mm pipe of
the flange.
This is no longer possible with the new
design
 
3-April-2019
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The DArT-2 tests involve twin experiments - DArT-2 and DArT-Test, focusing on ensuring the performance of DArT-2 in studying underground argon. Various tests like electronic tests of the PDM and vacuum tests are conducted to guarantee proper operation. Challenges with vacuum sealing and solutions like conical springs are discussed for DArT-Test. The tests aim to validate the PDMs and DAQ for smooth functioning.


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  1. DArT-2 tests Luciano Romero, Ludovico Luzzi, Jos Manuel Cela DArT Collaboration meeting 27-July-2022

  2. DArT-2 tests DArT-2 and DArT-Test are twin experiments. DArT-Test to give information about the operation and problems of DArT-2 DArT-2 to operate in ArDM to study the underground argon The main objective of the tests described here is to guarantee the performance of DArT-2 During construction and operation Types of tests Electronic test of the PDMs Vacuum test to check leaks. Physic test 39Ar measurement Alphas measurement

  3. Electronic tests of the PDM IV curve of the SiPM at room temperature (RT) IV curve of the SiPM at cryogenic temperature (CT) Dark current rate (CT) (noise) Finger plot of dark current (CT) (gain) Finger plot of LED driven light pulses (CT) (gain) This set of measurements guarantee the correct operation of the PDMs and of the DAQ

  4. Electronic tests of the PDM First test already done on PDM reception One PDM rejected (#70) 9 working properly Presented on 6 of July of 2022 Second test to be done with the PDM mounted in DArT-2 To mininize connection/disconnection of PDM (risky) Light tight enclosure. No need of vacuum tightness. Vessel cooled with liquid nitrogen at atmospheric pressure Using a provisional small cryostat DArT-2 vessel filled with gaseous nitrogen or dry air. Test noise with definitive power supplies Any problem can be easily fix. Subsecuent tests to be done with DArT-2 inserted in ArDM ArDM and DArT-2 filled with cold gaseous argon ArDM and DArT-2 filled with cold liquid argon

  5. Vacuum test of the vessel First test to be done at RT with a provisional teflon seal. At room temperature To assure the quality of the soft copper weldings Second test to be done after DArT-2 assembly. At room temperature Once the PDMs have been validated With definitive vessel seal made of 3 mm indium wire. Subsecuent cryogenic tests with DArT-2 mounted within ArDM Do not flash cool the vessel (See next slide)

  6. Vacuum problems in DArT-Test We poured LN2 into the cryostat containing DArT-Test The entire copper vessel is cooled very fast by the LN2 Due to the high heat conductivity of the copper: 385 W/(mK) The top flange is not cooled so fast It is cooled by the vessel through the indium seal Let assume a momentary difference of temperature of 100K between flange and vessel. The maximum displacement between flange and vessel is: 17 10-6K-1x 100 K x 0.12 m = 0.2 mm Enough to weak the indium seal Use conical springs to assure the sealing of the indium wire

  7. Physic test Vacuum and PDM tests done before. Need liquid argon inside DArT-2 Physics test are to be done within cold ArDM Not possible to do it in the current test cryostat (See next slide) Let ArDM be filled with cold argon gas To avoid time consuming filling of LAr 1 option: Condensate the liquid argon inside DArT-2 Increasing the argon pressure in DArT-2 Its no clear if the heat dissipation by gas convection allow the filling in a reasonable time. 2 option: Fill DArT-2 directly from a LAr commercial range Through the thin (CF16) gas connection

  8. Why is not possible to use the current cryostat to do physics test The original design use SAGANA D22 ferrules to join DArT to the gas system The use of ferrules was discarded because of vacuum leaks. In current design DArT is welded directly to a CF40 flange Old design allows the coupling of DArT to the cryostat flange The ferrule goes through the 40 mm pipe of the flange. This is no longer possible with the new design 3-April-2019

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