1. FTD Powering and technological Demonstrator manufacture
D. Moya, I. Vila, A. L. Virto,
Instituto de Física de Cantabria
F. Arteche, C. Esteban
Instituto Técologico de Aragón
12 APRIL 2012

2. Outline Power system FTD for the DBD DC-DC based Power system
LV Regulation + Supercaps system
FTD for the DBD
DBD
MDI meeting , 12 April 2012 , LAL Orsay

3. DC-DC-based Power System
To absorb transients related to power pulsing system.
Keep transients locally at FEE level.
Low currents before DC-DC due to converter ratio
Low transients
Synergy with SLHC and new DC-DC hard-rad design.
HF noise & Rad issues
MDI meeting , 12 April 2012 , LAL Orsay

4. DC-DC-based Power System
Power values per group:
Routing Inside each petal:
6 DC-DC converters
4 DC-DC (12V -2.5V)
2 DC- DC (12V- 1.25V)
Max out current per DC-DC less than 3 A (low transients)
Short cabling – Less than 1 meter (low voltage drop)
Outside petal
1 DC-DC per power group
200V – 12V
Max out current per DC-DC less than 3 A
Transients attenuated by the DC-DC
Outside experiment
1 AC-DC per disk
400V 50 Hz – 200V DC
Max current per cable less than 1 A 4
MDI meeting , 12 April 2012 , LAL Orsay

5. DC-DC-based Power System
Number of cables per petal
2 cables for DC-DC AWG 15 ( 1.65 mm2)
1 Cable for High Voltage AWG 24 ( 0.2 mm2)
Total cables per disk
32 cables for DC-DC ( a total section of 51,15 mm2)
16 cables of high voltage ( a total section of 3,2mm2)
A total section of 54,35 mm2 per disk (much lower than 158 mm2)
Another solution: reduce the modularity ( Modules of two petals, 1 DC –DC per each two petals, 1 AWG15 cable per petal) Total section of 28,775 mm2/disk
MDI meeting , 12 April 2012 , LAL Orsay 5

6. LV Regulation + Supercaps
This power system is based on :
Supercapacitors & LV regulators
Current source
To absorb transients related to power pulsing system.
Keep transients locally at FEE level.
It will generate high currents but very locally
Low transients because of short cable
X 16
1,5 V
2,5 V A1 R2 C1 R1
5 V
8/70 A
2.92 A / 0.3 A
1.42 / 0.15 A
MDI meeting , 12 April 2012 , LAL Orsay

7. LV Regulation + Supercaps
The main power unit is a current source
1 Per disk
Super-capacitor
Low ESR (24 mΩ)
Many power cycles cycles
Worst case
There is no 0 current during stand–by
These values have been estimated around 10% L1 L2
L16 SC R L V
7/8 A
7/70 A
MDI meeting , 12 April 2012 , LAL Orsay

8. LV Regulation + Supercaps
Power values per group:
Routing Inside each petal
3 Regulators
2 REG (5V -2.5V) / 2.92 A Pk – 0.29A
1 REG (5V- 1.5V) / 2.92 A Pk – 0.29A
Max out current per line (16 petals) – 4.34 A / 0.434A)
Short cabling – Less than 1 meter (low voltage drop) ?
2 Supercapacitors per disk – C=75 F / V=5 V / Imax=70 A
Outside petal
1 Cable per disk
Max out current per cable around 7/8 A (defined by FEE)
Outside experiment
1 Current source per disk
IDC = 7/8 A
A Pspice simulation has been carried out to study the transient distribution
MDI meeting , 12 April 2012 , LAL Orsay 8

9. LV Regulation + Supercaps
This technical solution looks fine
It will help decrease the material budget
Supercaps are made of carbon structures.
Main advantages:
The transient location is very close to FEE
The supercaps are relatively new but they will be very common in the future
Transport industry and other sectors have studied in detail the implementation of this type of systems
Main disadvantages:
The lack of knowledge about the behavior of this type of components in HEP environments.
MDI meeting , 12 April 2012 , LAL Orsay

10. LV Regulation + Supercaps
Per petal only one High voltage cable
Per disk
16 high voltage cables (3,2mm2)
1 cable for the capacitor ( 2,08 mm2)
Total section per disk of 5,28 mm2
MDI meeting , 12 April 2012 , LAL Orsay

11. FTD for DBD Mechanic : Cooling: Sensors
monolityc vs sandwich( FEA simulations)
Fixations to the B.P. and outer cylinder
Embedding of Fos sensors.
Cooling:
CO2 of force gas cooling ( FEA simulations)
Sensors
FTD3-7 Single sided AC sensors
FTD1-2 same as Vertex.
FBG sensors positions
MDI meeting , 12 April 2012 , LAL Orsay