1. Mauro Citterio - Mi meeting
PP2 Boxes
Mauro Citterio
on behalf of
INFN Milano
5/14/2012
Mauro Citterio - Mi meeting

2. Mauro Citterio - Mi meeting
A modified PP2 assembly
PP2 Assembly
The number of slots for the LV boards have been reduced to 9
 7 slot for IBL
(4 channels, 2 LDOs each)
 1 slot for DBM
 1 slot for VVDC powering
(8 channels)
Plus 1 slot for the controller board
On top of the LV crate, there is now the patch box for HV and DCS (Tmod and ENV) cables routing.
IMPORTANT: two PP2 assemblies needed for detector side !!!
 The two assemblies will be side by side
Simpler and shorter HV and DCS cable routing
Small increase in volume
Inspection in the cavern is done in February ….. Some concern on space
It could be advisable to “match” standard PP2 width for easy installation
5/14/2012
Mauro Citterio - Mi meeting

3. Mauro Citterio - Mi meeting
PP2 Location
Position in which the IBL PP2 box will be installed(Sector 13, platform 5-6)
NSQP interference …. One Standard PP2 Box in the same location
From the IBL PP2 box, VVDC cables are reaching the IBL-OptoBox
5/14/2012
Mauro Citterio - Mi meeting

4. Advantages with the new design (1 of 2)
Type II cable termination at PP2
Type II side
5/14/2012
Mauro Citterio - Mi meeting

5. Type II cable prototype
The “Axotress” braid, that surround the loose Type II bundle power cable need to be “terminated” or “extended” at the octopus cables.
From the picture the braid is “extended” to the LV cables
of the octopus.
Moreover, does the High Voltage cable really has a separate Braid Shield and Drain Wire, as shown in the bundle drawings?
How they are handled?
5/14/2012
Mauro Citterio - Mi meeting

6. Advantages with the new design
All boards (except controller) of the PP2 assembly will be built around the 8 LDO regulator concept
The design stay the same (motherboard + daughter board)
New layout of the motherboard with only 8 LDO and less drop on the board
achieved by larger copper traces and by doubling the pins used on the output connector
Overall board length can be decreased if necessary (and PP2 depth decreases accordingly)
Choice of single or double LDO usage per channel, defined
by INPUT and BACKPLANE routing
- layout the same for all boards
- no different spare types
More symmetrical behavior of LDOs during current sharing
Layout is still on going ….. Following this “new” concept
Goal is to complete GERBER by end of May
 Controller boards identical to the Pixel ones
(already in production)
8 LDOs not mounted anymore
Single LDO usage for VVDC powering
Two LDOs in parallel on a same channel.
Each LDO limited to ~ 50% of IMAX, for FEI4 powering
5/14/2012
Controller Board
Mauro Citterio - Mi meeting

7. Advantages with the new design
8 LDOs not mounted anymore
Single LDO usage for VVDC powering
Two LDOs in parallel on a same channel.
Each LDO limited to ~ 50% of IMAX, for FEI4 powering
5/14/2012
Mauro Citterio - Mi meeting

8. LV connector PIN definition (1 of 2)
5/14/2012
Mauro Citterio - Mi meeting

9. MATING FACE OF FEMALE CONNECTOR OR REAR FACE OF MALE CONNECTOR
GMCT 34 Insulator shown
The colored circles indicate the positions in which the contacts will be installed
NO contacts installed in the white circles
Male contact part number for AWG 12 is either:
Crimp type: MC112NS or
Solder type: MS112NS
The last letter “S” indicates the High Conductivity version of the contact.
Note: for AWG 22, 26, 28 wire
AXON could use standard contacts:
AWG 22  MC120NS
AWG 26/28  MC124NS
Legenda:
DRAIN: AWG 26
VDD: AWG 12
VDD Sense: AWG 28
VDD_Return Sense: AWG 22
VDD_Return: AWG 12
Pin
Signal B
Drain C
VDD1 E
VDD1 Sense J
VDD1_Return Sense L
VDD1_Return M
VDD2  P
VDD2 Sense T
VDD2_Return Sense V
VDD2_Return W
VDD3 Y
VDD3 Sense b
VDD3_Return Sense d
VDD3_Return f
VDD4  h
VDD4 Sense k
VDD4_Return Sense n
VDD4_Return

10. Work in progress on the PP2 INPUT side
2 conn per DCS +
1 con for HV, repeated 8 times, only a 3D model up to now !!!!
Aux power, for controller
LV input Type III input, V34 conn.
Only few pins will be used per conn.
[(4x2) + grounding, shielding and redundancy]
8 D-type VVDC +
CAN interface
PP2 NTC, D type
All mechanical LV PP2 drawings and schematics are almost ready.
Not yet finalized the HV/DCS patch box: mostly is choice of connectors.
- for example for the HV cable: in Type 3, the high voltage connector is a female Redel 51 pins on the power supply side. (ref Cern scem nr C), if space is allowed we should use the same also at PP2.
- same argument for TMOD and ENV type III cables …. Lost track of what connector is what
 Susanne please help
5/14/2012
Mauro Citterio - Mi meeting

11. Work in progress on the PP2 INPUT side (2 of 2)
All the mechanical and electrical aspect of the interface between INPUT and BACKPLANE is going to be reviewed in the coming weeks. We agreed upon:
- connector choice towards type III cables (VVDC LV, HV, DCS)
- pins assignment
- services duplication (CAN + Auxiliary Power) and “wire bundles”
From T0 then ~ 6-7 weeks to have Input Board in hands
5/14/2012
Mauro Citterio - Mi meeting

12. Mauro Citterio - Mi meeting
Conclusions
The main topic of the talk was to review the “boundary” conditions still to be addressed to finalize PP2 production
We have to produce, test and delivery
~60 regulator boards
12 VVDC boards
12 backplane
12 Input Board
10 Mechanical assemblies
The BACKPLANE and INPUT schematics need only to be polished. Layout is being on hold for some time but I am confident we could now move forward in the next couple of weeks.
Based on the experience gained in the past, this “heavy copper” boards are not too complicated for industry, so a typical 4 week delivery time + 2 for assembly is reasonable
Controller board has been produced (April 2012)
Regulator board layout: the 8 LDOs concept has requests some new thoughts. We are working on the layout
In parallel we have been acquiring components with “long lead time” or “minimum quantity” constraints to avoid surprises.
Time for test and validation of production will also be critical especially because we will be testing more than one object at the same time with limited manpower
Realistically, the first IBL pieces will be ready by beginning of september, but not before.
5/14/2012
Mauro Citterio - Mi meeting