1. Overview of T1 detector T1 is composed by 2 arms
Each arm is composed by 5 planes
Each plane is composed by 6 CSC trapezoidal chambers
Each chamber is composed by 1 anode and 2 cathode planes
For mechanical reasons, each arm is divided into two halves : each halve is considered independent to the other also from electrical/logical point of view
In total, each halve include 15 chambers
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2. T1 functional electronics system architecture
On Detector
region
Local Detector
region
Counting Room
region
TOTFED
TOTFED
LVDS
CMOS
TDAV
MUX
GOHs
Trigger Info
OPTORx
Trigger bits
CSC Detectors
AFECs
CFECs
Readout
Path
S-bit
DataOut
Clk40
FastCmd
I2C
LVDS
CMOS
DDAV
MUX
GOH
OPTORx
Data bits
VFAT
OPTORx
TTCRx
Data to DAQ
(S-Link; VME; or USB)
ROC
SPY
Mezz
VFAT
TrgMez
DOHM
FEC
CCUM
Control
Path
DOHs
mFEC
CLK40
Tree
QPLL
TokenRing
VFAT
PLL25
40÷100 cm
TTC
DCU
CMOS
LVDS T1
Tree
TTCRx
TOTEM
Slow Control
4 x 15 Det
4 x 15 AFEC + 4 x 39 CFEC
4 x 9 ROC
4 x 1 DOHM
2T + 2D + 4mFEC
= 4 x T1 ¼
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3. On and Local detector region electronic boards
DOHM-CCU
SLOW CONTROL RING
CSC Plane_n+1
3 x CFEC = 2 x 192chs
AFEC 220chs
50cm
CSC Plane_n
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4. T1 electronic boards placement.
6th frame
= CSC
ROCs 45
= ROC C A 5 T
ROCs 23 C 4 A
ROCs 01
= DOHM C A 5 C 3 T C M
= CFEC 4 C A 2 T C
DOHM 3 C A A 1 M
= AFEC 5 2 C A 4 M C C 1 A B 3 C A C 2 A A A B C 1 A B C
= IP5 A A
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5. DCS T1 H.V. architecture (1) - Far Near + SCADA OPC Server 4 x A1550P
HV modules
R.M.= 52 pin Radiall Connector
¼ T1
¼ T1 -
Distribution box on 6° frame
Distribution box on 6° frame
R.M.
R.M.
SHV
SHV
Far
Near
R.M.
SHV
SHV
R.M.
Distribution box on 6° frame
Distribution box on 6° frame
A1550P
24 Chs
5 kV/1mA +
¼ T1
¼ T1
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6. T1 H.V. architecture (2)
Located in Counting Room, each ¼ T1 has available one A1550P board with 24 HV common floating signal return channels.
Locally in the Counting Room, the common Signal Return and the HV cable Shield can be connected in different ways, together or to the SY1527 Mainframe ground (AGND).
A 100m long multiwire HV cable, connect each A1550P module to the ¼ T1 platform, where a short 4.5m cable, branchs the HV sources to the 6th frame.
On the T1 6th frame a distribution box is located, here only 15 out of 24 HV chs are connected to the chambers via SHV connectors.
The shield of each SHV connector is connected to the external copper layers of the chambers, that are isolated from the structure. The external layers of the chamber represent the Signal Return connection.
The main HV cable has the shield connection available on two pins of the Radiall multipin connector, but instead it is isolated from the connector metallic shell. This in order to avoid unforeseen contacts between the shield and the metallic structure of the environment.
The cable shield is available on a fast-on connector
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7. X T1 HV system cabling, Control Room side.
HV Main
Frame
T1 HV cards (#4)
Ground
jumpers
A1550P
A1550P
A1550P
A1550P
T2 HV cards
RP HV cards
C.R. Main power Gnd SR
Board
chassis
ShG
220Vac
{AGND}
4 x HV shielded multiwire cable (100m) +
4 Common Ground Return
24 HV sources
2 Interlock wires
2 Shield wires
No ShG on the shell HV
3.6kV X - SR
T1 HV system cabling,
Control Room side. R C
= AGND
Option
ShG
24 common ground
floating sources
5kV/1mA.
ShG = HV cable Shield.
SR = HV Signal Return.
to the Cavern
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8. = Reference Ground (RG)
T1 Platform
From C.R.
No ShG on the shell
4 Gnd Rtn
24 HVs
2 Interlocks
2 Shields
HV cable
T1 6th frame
HV cable, 4.5m
Interlock
Switches 1 8
SHVs
No ShG on the shell 9 15
Chs 16  24
available
HV cable
1.5m
ShG 16 24
HV Chs 1  15
CSC#1
CSC#15
T1 HV system cabling,
Cavern side.
= Reference Ground (RG)
= Signal Return (SR)
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9. T1 L.V. architecture (1) - Far Near + Control Room -N -F +N +F -n -f
MARATON Primary Rectifier -N -F +N +F
MARATON Remote Controller -n -f +n +f
2 x 4 ; 36 wires shielded cables, to MARATON Power Box
¼ T1
¼ T1 -
MARATON Power Box
Distribution Box 6° frame
Distribution Box 6° frame
MARATON Power Box
Far
Near
On platform
On platform
MARATON Power Box
MARATON Power Box
Distribution Box 6° frame +
Distribution Box 6° frame
¼ T1
¼ T1
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10. T1 L.V. architecture (2)
Located on its platform, each ¼ T1 has available a Wiener MARATON 12 LV floating channels system.
Only 7 out of 12 chs are used and cabled with independent shielded cables (2 x 16mm2 each) up to the T1 6th frame. These 7 cables together with LV sensing, DCS, HV and optic fiber cables, are routed inside a cable tray groove made on the CMS endcap disk.
The 7 LV chs are connected on the T1 6th frame as follow:
three main branches with 2 voltages (2V5: analog and digital) each, devoted to supply LV power to the three set of ROCs (top + middle + bottom {same plane}).
One branch with 2V5 digital voltage, devoted to supply LV power to the slow control ring Digital Optic Hybrid Module (DOHM).
The LV distribution internally to the ¼ T1, is done with independent shielded cables (2 x 1.5mm2). The cables powering the same set of ROCs (top + middle + bottom) have the same length, while the LV sense wires are connected only on the ROC located in TOP position of the set.
All the LV cables have the shield connected to a fast-on connector
Each ROC supply LV power (2V5: analog and digital) to the AFEC and CFEC cards where the VFAT hybrids are hosted. Depending the dimensions of the chambers managed, each ROC supply LV power up to 2 AFECs and 4  6 CFECs. These connections are performed with 50 wires flat cable. LVDS signals from the F.E. use the same cable.
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11. ¼ T1 L.V. architecture (3), ROCs cabling.
From MARATON Power Box on the platform
7 x (2 x 16mm2) shielded cables
L.V. Distribution box on ¼ T1 6th frame
Ch-U9
Ch-U8
2V5D
Ch-U6
Sense
DOHM
I tot: U6
2V5D
2V5A
Ch-U5
Ch-U4
Sense
ROCs 23
TOP
MIDDLE
BOTTOM
I tot: U5 U4
Ch-U1
Ch-U0
2V5D
2V5A
2V5D
2V5A
Sense
Sense
Shielded Cables
Shielded Cables
Shielded Cables
TOP
MIDDLE
BOTTOM
TOP
MIDDLE
BOTTOM
To AFEC-CFEC
To AFEC-CFEC
To AFEC-CFEC
ROCs 01
ROCs 45
I tot: U9 U8
I tot: U1 U0
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12. ¼ T1 L.V. architecture (3), ROC positions.
6th frame
ROCs 45
= CSC 5 T
ROCs 23 4
ROCs 01
= ROC 5 3 T M 4 2 T
= DOHM
DOHM 3 1 M 5 2 4 M 1 B 3 2 B 1
= IP5 B
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13. Slow Control Ring (SCR) cabling
6th frame
ROCs 45
= CSC 5
0x7E
ROCs 23 4
ROCs 01
= ROC 5 3
0x77
0x7D 4 2
0x78
= DOHM
DOHM 3 1
0x76 5 2
= SCR cable 4
0x79 1
0x7C 3 2
0x7B 1
= IP5
0x7A
T1 SCR is based on CMS CCU25 custom device.
Each ¼ T1 consists of nine nodes, each node has a CCUMezzanine locally powered by the ROC where it is hosted. The DOHM (optic to electric interface board) is powered using a dedicated LV channel.
Each node has its unique address, the LVDS data transmission along the loop is made adopting twisted pairs shielded cable.
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