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SPS RENOVATION Final design and status. R.Mompo , P.Dahlen , Y.Bastian, I.Romera, M.Zerlauth . SPS LAYOUT and Magnet Powering. SPS (7 kms ) composed of 6 sextants Main dipole and quad magnets powered in series , power converters located in respective BA

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sps renovation final design and status
SPS RENOVATIONFinal design and status

R.Mompo, P.Dahlen, Y.Bastian, I.Romera, M.Zerlauth

sps layout and magnet powering
SPS LAYOUT and Magnet Powering
  • SPS (7 kms) composed of 6 sextants
  • Main dipole and quad magnets powered in series, power converters located in respective BA
  • Auxiliary (corrector) magnets powered individually (some exceptions) from respective BA
  • Ring-line magnets (quadrupole, octupoles, sextupoles) powered in series in whole SPS ring from BB3
  • Current interlock system built in 1974 (mains)  1980 (Aux)




During last MPE-TM meeting, we concluded that they were 2 realistic options (#3 or #4) to renovate the SPS interlock system !

Finally, we have chosen option #3 ! I will explain why in the following slides...


SPS Magnet families

Main Dipole and Quadrupole Magnets

Ring-Line Magnet

Auxiliary Magnet

principle of the sps interlock system3
Principle of the SPS interlock system

Each magnet has an interlock box to collect signals from thermo-switches and for visual indication («trefle»)

plc architecture 1 2
PLC architecture (1/2)
  • Configuration of WIC PLC for the “Mains” and “Aux. circuits.
  • In BA1 * , BA2, BA3, BA4, BA5 and BA6:
  • * In BA1, there is no “Aux.” crate (circuits combined with TT10 transfer line not renovated during LS1).

6 “new” racks

5 existing racks


cohabitation 

plc architecture 2 2
PLC architecture (2/2)
  • Configuration of WIC PLC for the Ring-Line located in BB3:

1 existing rack


cohabitation 

powering scheme of the main dipoles
Powering scheme of the main dipoles
  • If a dipole magnet overheats (or any powering failure):
  • All 14 PCs must be switched off!
  • If we put a WIC in each BA (to protect 1 sextant), how do we propagate the info to the PCs located in the other BAs?
  • Do we need to introduce a PLC-PLC communication between the WICs ??? (=> use of non- safety PLCs ).
  • Long distances: Issues on reliability/ dependability/ reaction time?
  • How do we send a «Beam Dump» signal to the BICs?

EDMS: 681304

powering scheme of the main quadrupoles
Powering scheme of the main quadrupoles
  • In a way simpler, as all PCs are located in 1 BA (BA3).
  • But the WIC installed in BA3 must also receive the info from all other sextants?

EDMS: 681372

powering scheme of the ring line
Powering scheme of the “Ring-Line”
  • The “Ring-Line” is composed of:
    • Quadrupole, sextupole, octupole magnets
    • Divided in 4 circuits (166 magnets, 8 PCs)
    • All PCs are in BB3
  • One of the main objective of this renovation (despite replacing the old electro-mechanical crates) is to split the “Ring-Line” in half sextants
    • In 2012, we lost 24h to identify the origin of a problem in the Ring-Line (impedance of the line changing due to ageing of the TS).

From the WIC side, it is seen as:

4 x (6 x 2) = 48 circuits !

powering scheme of the ring line1
Powering scheme of the “Ring-Line”
  • Since we had to put in place patch panels for the «Ring-Line», it became obvious that we could also centralise all the quadrupole signals in BA3 (where the PCs are located)
    • => Advantage: Avoid using crates belonging to EPC

This doesn’t solve our communication pbm for the dipoles!

communication between bas
Communication between BAs

Overview of the layout of all BAs (for the mains):

Interlock crate

(present in each BA)

Dipole & Quads PC’s

EDMS: 682971

Around year 2000, EPC introduced some major changes:

Local PLCs to pilot each PC.

A Master_PLC.

A Hardware Interlock Loop (HIL)!

Centralisation crate for the mains Quads

Water interlock

crate (EN/CV)

Crates named «chassis CO» and “CISBOX” are used to distribute signals between «BAs».

communication between bas1
Communication between BAs
  • Overview of the layout of all BAs (for the mains):
  • Modifications after LS1:

EDMS: 682971

hardware interlock loop hil
Hardware Interlock Loop (HIL)
  • 3 current loops
    • Red: main dipole
    • Green: main quadrupole
    • Blue: Sextupole PCs of the Ring-Line
  • If a loop is open, all PCs of the same loop will trip and send a beam dump signal to the BIC in BA3.
  • HIL loop and functionality remains under the responsibility of TE/EPC

EDMS: 684948

Thanks to this HIL loop, our WIC PLCs in each BA do not need to communicate between them!

=> In case of a fault in 1 sextant, the WIC sends a «FPA» to the 2 PCs of the corresponding BA. This will cause the opening of the HIL loop and the trip of the other PCs!

beam dump current situation
Beam Dump (Current Situation)

CIB.BA3.S3.Beam Dump Control.

  • The Beam Dump Request:
    • The beam dump requests are centralized in BA3.
    • 3 input signals (Dipole, Quads, Sextupoles).
    • + 1 input from the ROCS system (that checks the consistency between the output of the PCs and the loaded functions)
    • + Other PCs are interlocked via the Software Interlock System (SIS).
    • ... + inputs for all other systems.
  • Our proposal:
  • Keep those inputs as is.
  • Add a signal sent by the WIC to the BIC in each respective BA.

In the future, we could think of replacing this crates (EPC) by a FM352 PLC (High speed Boolean Processor).

status of the renovation
Status of the renovation
  • Functional Specification (EDMS 1295506):
    • A first version is being circulated to gather comments from all groups involved with detailed explanation of all changes (What will stay, what will be removed, cabling convention etc...).
  • Underground work:
    • EN/EL has installed the cables for us in BA3 and BA5 (2/6 sextants).
    • 13 patch panels are in place in the tunnel.
  • Surface work:
    • 5/6 “new” racks installed in each BA. UPS and UTP installation scheduled.
    • 15/31 PLC crates are cabled, remaining ones should be ready by end of August 2013 (Spie).
    • Patch panels (x17) are ordered, need to be cabled (+ control cables) .
  • PLC/PVSS programming:
    • David Willeman’s (EN/ICE) contract ends in Feb. 2014 
    • We depend on David to get the PLC programs  (… true as well for Booster, Linac4 etc...)

We agreed on deadlines to get the programs before!

  • HWC:
    • Discussion started to optimize the strategy, given the little time dedicated to the powering tests before the SPS restart (planned for July-Aug. 2014).
      • For the final checks, we need the PC to be «déconsigné».
  • In the case of a renovation, to design an efficient magnet interlock system, one has to know in details how a machine is operated... (Machine layout, naming convention, interaction with other systems, standard operation mode as well as non standard operation modes i.e. MD, different people).
    • “Each machine at CERN is a different Kingdom”, dixit Karel Cornelis 
  • In «old» machines (same issues for the «Booster» and the «PS») the optic of the machine is often modified, therefore some flexibility must be anticipated at the level of our WIC configuration (to avoid hardware & software modifications at every changes).
  • Production of hardware and cable installation is going on as scheduled.
  • Potential issue with David Willeman’s contract ???
  • During LS1, our colleagues from EN/EL will replace all cables in sextant 1.
    • Part of the standard procedure to replace periodically cables exposed to radiation

=> We are impacted.