1. The JUNO Top Tracker Marcos Dracos IPHC-Strasbourg
M. Dracos
The JUNO Top Tracker Marcos Dracos IPHC-Strasbourg
Tsinghua, March 2017
M. Dracos IPHC-IN2P3/CNRS/UNISTRA

2. M. Dracos IPHC-IN2P3/CNRS/UNISTRA
Top Tracker
Top Tracker
Veto for the covered surface (impossible to cover all surface around the central detector).
Study the production of 9Li/8He produced by muons crossing the detector and mimicking IBDs (~80 against ~60 IBD/day).
Study the production of fast neutrons produced by muons crossing the surrounding rock.
Precise measurement of the energy spectrum of cosmogenic isotopes.
Define the cuts to be applied in the CD to reduce these backgrounds.
Introduce all measured parameters in the simulation.
Better estimation of systematic uncertainties induced by this noise.
Tsinghua, March 2017
M. Dracos IPHC-IN2P3/CNRS/UNISTRA

3. M. Dracos IPHC-IN2P3/CNRS/UNISTRA
Top Tracker
How to cover a significant fraction of the top surface (40x40 m2) and tag a large number of cosmogenic background?
take the decommissioned OPERA Target Tracker
~2900 m2 sensitive plastic scintillator area
Tsinghua, March 2017
M. Dracos IPHC-IN2P3/CNRS/UNISTRA

4. M. Dracos IPHC-IN2P3/CNRS/UNISTRA
JUNO Top Tracker
62 walls (496 modules)
6.8x6.8 m2 sensitive area x y
Hamamatsu MA-PMT (3x3 cm2)
(64 channels, ch. in total)
Tsinghua, March 2017
M. Dracos IPHC-IN2P3/CNRS/UNISTRA

5. OPERA TT dismounting (finished)
M. Dracos
OPERA TT dismounting (finished)
6.8 m
During the extraction of one TT wall (over 62) from OPERA detector.
The TT is now stored in 7 containers in the underground lab of Gran Sasso waiting to be shipped to China.
Tsinghua, March 2017
M. Dracos IPHC-IN2P3/CNRS/UNISTRA

6. TT storage area in China (2017-2020)
M. Dracos
TT storage area in China ( )
TT storage (and PMT testing)
JUNO
temperature control probably needed
(for the next 3 years)
Pan-Asia Warehouse
Tsinghua, March 2017
M. Dracos IPHC-IN2P3/CNRS/UNISTRA

7. M. Dracos
TT aging monitoring
Conditions during storage will be very different wrt Gran Sasso (temperature, humidity, radiation etc.) and hence the ageing of the plastic scintillator could be faster if the proper treatment is not done promptly.
Few TT modules remained with their "old" electronics and DAQ to monitor their behavior inside the containers.
TT modules with electronics inside the containers
reconstructed muon track
number of p.e.
Tsinghua, March 2017
M. Dracos IPHC-IN2P3/CNRS/UNISTRA

8. M. Dracos IPHC-IN2P3/CNRS/UNISTRA
Top Tracker Structure
M. Dracos
3 TT layers spaced by ~1 m (3 m height in total),
a solid bridge is needed to support the TT and its mechanical structure (~200 tons in total),
accessibility to electronics
easy to mount without too much interference with other activities (e.g. LS filling)
Tsinghua, March 2017
M. Dracos IPHC-IN2P3/CNRS/UNISTRA

9. Top Tracker drawings bridge (40x21 m2, ~200 tons) IHEP
M. Dracos
bridge (40x21 m2, ~200 tons)
IHEP
overlap of sensitive areas by ~15 cm
TT mechanical support by JINR, drawings by IPHC
3 TT layers
~3 m
electronics accessible from the bottom or top
access to bottom electronics
Tsinghua, March 2017
M. Dracos IPHC-IN2P3/CNRS/UNISTRA

10. ~6 months in total for mounting the TT
Top Tracker mounting
used for positioning of TT end caps
supporting frame used during mounting and remaining after for final mounting
auxiliary frame used during mounting and transportation
(same for all walls)
walk paths to access the TT electronics
Dubna
~6 months in total for mounting the TT
possible area to mount the TT walls
Tsinghua, March 2017
M. Dracos IPHC-IN2P3/CNRS/UNISTRA

11. TT DAQ Rate (radioactivity)
The sample with label 2702 is extracted from underground between -633 m and -638 m, few meters above the bottom of the water pool. 
Measurement realised by CENBG -Bordeaux using a Ge detector.
GS (just for comparison):
40K 26 ± 2 Bq/kg
238U 1.8 ± 1 Bq/kg
232Th 1.5 ± 1 Bq/kg
much higher radioactivity than in GS!
Tsinghua, March 2017
M. Dracos IPHC-IN2P3/CNRS/UNISTRA

12. TT Rate and electronics (radioactivity)
simulations done by LLR and IPHC
800 Hz/ch.
~25 Hz/ch. in Gran Sasso Hz
coincidences are needed Hz
3 well aligned points (fit)
very low rate obtained using well aligned points
no problem to be done off-line
for on-line, fast coincidences have to be performed
just putting each point at the middle of each wall reduces the rate to about 1.2 kHz, affordable by the DAQ
Tsinghua, March 2017
M. Dracos IPHC-IN2P3/CNRS/UNISTRA

13. TT Electroniques OPERA new electronics concentrators,M5
PM5
PM1 M1
RO1
PM2 M2
RO2
PM3 M3
RO3
PM4 M4
RO4
PM12
M12
RO12
PM11
M11
RO11
PM10
M10
RO10
PM9 M9
RO9
CONCENTRATOR BOARD
(GDCC)
RO5 M6
PM6
RO6 M7
PM7
RO7 M8
PM8
RO8
M16
PM16
RO16
M15
PM15
RO15
M14
PM14
RO14
M13
PM13
RO13
OPERA
new electronics
local x-y trigger (LV1)
global trigger (LV2)
concentrators,
one per TT wall (16 PMTs)
(62)
front end cards with MAROC3 chip (996)
DAQ cards
(996)
feedback to the sensors in less than 1 μs
Tsinghua, March 2017
M. Dracos IPHC-IN2P3/CNRS/UNISTRA

14. M. Dracos IPHC-IN2P3/CNRS/UNISTRA
MAROC3 Chip (Omega)
Out_Q : Multiplex charge output
Triggers
OR of triggers
Out_ADC : Internal ADC output
fast trigger
charge measurement (internal and external)
Tsinghua, March 2017
M. Dracos IPHC-IN2P3/CNRS/UNISTRA

15. Front End Board (IPHC) FPGA MAROC3 in its initial encapsulation,
test card provided by OMEGA
FPGA
MAROC3 in its initial encapsulation,
too large to fit on the front end board
ATLAS like FEC
new BGA encapsulation
new FEB (inspired by ATLAS)
Tsinghua, March 2017
M. Dracos IPHC-IN2P3/CNRS/UNISTRA

16. M. Dracos IPHC-IN2P3/CNRS/UNISTRA
Front End Board
New version (almost final)
successful running the chip two times faster than recommended (80 MHz) to decrease the dead time
Maroc 3A (BGA) test  OK
Version 2 of the front end  Tested
Final testing of the front end card with PMT
Test with the JUNO ROB is coming
Tsinghua, March 2017
M. Dracos IPHC-IN2P3/CNRS/UNISTRA

17. Readout Board (LNF-CAEN)
Board design: completed.
PCB design: completed.
PCB production: completed.
Board assembling: March 2017.
RO Board validation: May 2017.
FE-RO Boards system validation: July 2017
8 layers
light injector pulser
(already tested)
HV module
Tsinghua, March 2017
M. Dracos IPHC-IN2P3/CNRS/UNISTRA

18. M. Dracos IPHC-IN2P3/CNRS/UNISTRA
Readout Board
CAEN-LNF
FEB-ROB connector
(already tested)
First two ROB prototypes
Tsinghua, March 2017
M. Dracos IPHC-IN2P3/CNRS/UNISTRA

19. Concentrators (based on an existing card at LLR)
Giga Data Concentrator Board (GDCC)
This system is used for:
CALICE ECAL project (ILC development) : Readout OMEGA SKIROC chip
WAGASCI Project (T2K upgrade) : Readout OMEGA SPIROC chip
Other systems at LLR to read OMEGA EASIROC and MAROC chip (under evaluation)
Format : VME 6U (chassis with only J1 connector used for power distribution)
Format shared in 2 parts (1/3 – 2/3)
1/3 is the mezzanine with the HDMI connections
2/3 is the GDCC “heart” with the main functionalities (Based around a Xilinx Spartan XC6SLX75 + Marvell component)
USB is used to an extra access to the GDCC (debug for example)
VME
USB
RJ45 & sfp fiber
Main part
Mezzanine part
7 x DIFs HDMI
CCC HDMI
also performing x-y correlations
Tsinghua, March 2017
M. Dracos IPHC-IN2P3/CNRS/UNISTRA

20. M. Dracos IPHC-IN2P3/CNRS/UNISTRA
TT prototype
Test of electronics in almost real conditions
IPHC
4 x-y layers
electronics tests
triggering
online software
muon telescope
Tsinghua, March 2017
M. Dracos IPHC-IN2P3/CNRS/UNISTRA

21. M. Dracos IPHC-IN2P3/CNRS/UNISTRA
Conclusion
M. Dracos
OPERA TT already dismounted and stored in 7 containers in GS.
Custom formalities to be settle before shipping.
Storage in a warehouse in China (together with 20" PMT testing).
TT scintillator aging monitoring during storage.
TT design of the supporting structure almost final (3 layers, allowing accessibility to all electronics, IHEP, JINR, IPHC).
Almost final FEB design, 2 prototypes produced by IPHC.
ROB under construction by CAEN and LNF, a prototype very soon.
Prototype concentrator based on existing card soon, by LLR.
Installation in 2020.
Tsinghua, March 2017
M. Dracos IPHC-IN2P3/CNRS/UNISTRA