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 28 November 2018 Saverio MINUTOLI

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 28 November 2018 Saverio MINUTOLI

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 28 November 2018 Saverio MINUTOLI

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 28 November 2018 Saverio MINUTOLI

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 28 November 2018 Saverio MINUTOLI

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 . 28 November 2018 Saverio MINUTOLI

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 28 November 2018 Saverio MINUTOLI

= 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) 28 November 2018 Saverio MINUTOLI

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 28 November 2018 Saverio MINUTOLI

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. 28 November 2018 Saverio MINUTOLI

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 0.5A@2V5D 2V5D 2V5A Ch-U5 Ch-U4 Sense ROCs 23 TOP MIDDLE BOTTOM I tot: U5 10A@2V5D U4 5A@2V5A 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 7A@2V5D U8 2A@2V5A I tot: U1 10A@2V5D U0 5A@2V5A 28 November 2018 Saverio MINUTOLI

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 28 November 2018 Saverio MINUTOLI

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. 28 November 2018 Saverio MINUTOLI