Status of the tof low voltage system
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Status of the TOF Low Voltage System. Salvatore de Pasquale INFN Bologna. TOF-LVS Distribution Overview. Detector Layout: 18 barrel sectors, 5 modules per sector 1 central module containing 15 strips 2 intermediate modules containing each one 20 strips

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Status of the TOF Low Voltage System

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Status of the tof low voltage system

Status of the TOF Low Voltage System

Salvatore de Pasquale

INFN Bologna

Salvatore De Pasquale INFN Bologna


Tof lvs distribution overview

TOF-LVS Distribution Overview

Detector Layout:18 barrel sectors, 5 modules per sector

1 central module containing 15 strips

2 intermediate modules containing each one 20 strips

2 external module containing each one 19 strips

Strip layout:1strip = 96 read-out pads (channels) 93 Strips per sector; Total # of Strips = 1674

FEC:32-channels card hosting amplifiers, comparators

and the high resolution TDCs

Each strip is read out by 3 FECs

45, 60 or 57 FECs per module

Total # of FECs = 5022

Number of channels:1440, 1920 or 1824 channels per module

8928 channels per sector

Total # of channels = 160704

Salvatore De Pasquale INFN Bologna


Tof lvs distribution overview1

TOF-LVS Distribution Overview

Read-Out Controller(ROC):Each ROC can drive a maximum of 16 FEC

Size of a ROC card = roughly as 1.5 FEC

3 ROCs for the central module

4 ROCs both for intermediate and external modules

Total # of ROC = 342

Multipl. Data Transfer(MDT):1 MDT per module

Size of MDT card = roughly as 1.5 FEC

Total # of MDT = 90

Summary of the Electronics to be installed in a Module

Central Module:45 FECs, 3 ROCs, 1 MDT

Intermediate Module:60 FECs, 4 ROCs, 1 MDT

External Module:57 FECs, 4 ROCs, 1 MDT

Salvatore De Pasquale INFN Bologna


Tof lvs distribution overview cont d

TOF-LVS Distribution Overview (Cont’d)

Power consumption per channel:FEA= 130mW (ASIC) or 300mW (No ASIC)

TDC= 110mW

Logic (FPGA)= 50mW

Analog (DAC)= 60mW

Contingency= 50mW

Total(ASIC): Pnom = 400mW, Pmax = 500mW

Total(non ASIC): Pnom = 570mW, Pmax = 712mW

Digital and Analog circuitries will be totally independent

Power consumption per module:Power=1.37 kW(~0.71 digital and ~0.66 analog)

Current for 6V (analog line)= 110 A

Current for 6V (digital line)= 118 A

Power consumption per sector:Power=6.37 kW(~3.3 digital and ~3.1 analog)

Current for 6V (analog line)= 525 A

Current for 6V (digital line)= 550 A

Total Power consumption:ASIC solution: Pnom= 64.3kW, Pmax= 80.3kW

Non ASIC solution: Pnom= 91.6kW, Pmax= 114.4kW

Major power consumer in ALICE

Salvatore De Pasquale INFN Bologna


Tof lvs segmentation

TOF-LVS Segmentation

In the more power consuming scenario and considering a conventional distribution:

LV power supply which provide the appropriate voltage to the cards (e.g. +5V; –5V)

in the distribution arm to a sector have to circulate currents of about 1100 A and a total current of about 20000 Ato the whole detector.

We take, as an example, the WIENER Modular Power Supply system series PL 500 F arranged in 3U size modules.

We consider the MEH type power module (6V, 90A switching power supply).

6x3U units are used to feed the analog circuitry of a complete sector.

6x3U units are used to feed the digital circuitry of a complete sector.

A total number of 216WIENER PL500F 3U modules are needed to power the whole TOF

They can be arranged into 44 3U crates (5x3U units per crate)

hosted in 8 racks (low voltage racks) located on both sides of the detector.

(This segmentation is just an indication and is not yet optimized)

Salvatore De Pasquale INFN Bologna


Tof lvs segmentation1

TOF-LVS Segmentation

Space Frame Bar

Cooling shield

Magnet door

TOF Module

6V

90A

10 mm

44 Low Voltage

3U crates

10 mm

2x18

6V

90A

DV<1V

216 bus-bars 100 mm2 each

8 Low Voltage racks

Salvatore De Pasquale INFN Bologna


Tof lvs segmentation2

TOF-LVS Segmentation

Assuming a voltage drop < 1V over a distance of 40 m (the average distance between the racks area and the space frame) we need cables (bus-bars, cooled inside the L3 magnet) with a square section of about 100 mm2to connect each LV power supply unit with the TOF detector.

216 bus-bars of 100 mm2 are needed for the whole detector.

Each line will be connected, through a flexible cable, to patch panels, located on the space frame bar.

The patch panel will then ensure the distribution, both for the analog and digital circuits, to the single TOF modules front-end electronics

Salvatore De Pasquale INFN Bologna


Tof lvs distribution another approach

TOF-LVS Distribution (another approach)

To reduce the huge amount of current on the distribution lines, we can adopt a different approach:

a Low Voltage power distribution with the use of high voltage (48 Volts) power supplies associated with DC/DC converters inside the detector

The main concern is:

are there available reliable DC/DC converters which can work in a high radiation and high magnetic field environment?

**************

We started, at the beginning of this year, a collaboration with CAEN to develop DC/DC converter capable to work up to 5000 Gauss and sufficiently rad-hard for the purpose of the TOF.

On June 14th , a first CAEN prototype of DC/DC converter (150W) has been successfully tested at CERN in a magnetic field of 1850 Gauss (thanks to the Electronic Pool).

Salvatore De Pasquale INFN Bologna


Tof lvs distribution another approach1

TOF-LVS Distribution (another approach)

Considering a power supply of 48V and 150 A:

only one power supply is needed to power an entire sector (a total of 18 48V PS) just one 40m bus-bar 12x12 mm2 per sector is needed to connect the 48V PS to the space frame near the TOF modules.

The bus-bars are then connected, through flexible cables, to a patch panel that distribute the power to 5 or 6 DC/DC converter (240W to 280W) located inside each TOF module.

A total number of 90 or 108 DC/DC converter is needed to power the whole TOF The DC/DC converter will be equipped also with filters and control units able to read-out various parameters and switch on and off groups of front-end cards.

Planning: Test DC/DC converter up to 5000 Gauss and check for reliability and robustness.

Salvatore De Pasquale INFN Bologna


Distribution scheme to a tof sector another approach

VFE module

VFE module

VFE module

VFE module

slave card

5 channel

slave card

5 channel

slave card

5 channel

slave card

5 channel

slave card

5 channel

slave card

5 channel

slave card

5 channel

slave card

5 channel

Distribution scheme to a TOF Sector (another approach)

Cables running

to each module

Flexible cable

~40m Bus Bars

LV PS 48V

in the racks area

Patch panel on the

S.F. bar

Screw

Joint

cooled

cooled

cooled

Feed Through

TOF Module

DC/DC converter

with filters and controls

(placed inside the module)

15, 20 or 19 strips

in each module

Strips

FEC

Front End Card

32 channels

FEC

Front End Card

32 channels

FEC

Front End Card

32 channels

FEC

Front End Card

32 channels

FEC

Front End Card

32 channels

Salvatore De Pasquale INFN Bologna


Lvs distribution another approach

LVS Distribution (another approach)

Space Frame Bar

HV

Patch Panel

LV

Patch Panel

Signals and Services

Patch Panel

48V line

TOF Module

Bus Bar

Salvatore De Pasquale INFN Bologna


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