FGC Upgrades in the SPS

V. Kain, S. Cettour Cave, S. Page, J.C. Bau, OP/SPS

April 2014 1

2

Introduction – FGC for the SPS

During LS1 the SPS power converter controls framework ROCS was replaced by the more powerful

FGCD framework

ROCS was relying on obsolete products such as SL_Equip and LynxOS

FGC: new standard across the CERN accelerator complex

FGCD follows the FGC power converter state model.

Function generation and state are coupled together.

FGCs will be used by the power converters and RF.

RF will have additional RFFG card for more resolution (FGC limited to 1 kHz). April 2014

3

FGCD state model

April 2014

4

FGC states for the main operation of SPS power converters

During the main operation of the SPS as a multi-cycling machine, the power converters will be in state CYCLING

April 2014

5

Other aspects…

Power converters that are connected to the interlock system will remove the permit if not in an operational state:– on_standby or to_cycling e.g. are not operational states.

Automatic polarity switching is supported– Dynamic switching between dipole chain in TI 8 and TT41 not for the

time being.

April 2014

6

FGCD opened the door to significant improvements

The new SPS COAST

Improvements to SPS Economy

All the changes were only possible with some significant upgrade of the injector timing system and LSA for the SPS

April 2014

7

CONCEPT OF THE NEW SPS COAST

April 2014

8

The main features of the new SPS COAST - 1 A cycle with the same timing user can be “cycling" or in COAST.

The difference is made with the introduction of machine modes in the timing system: CYCLE, COASTPRE, COAST, COASTREC

A single timing table exists for all machine modes for a given timing user.

But the sending of an event is conditioned with machine mode– E.g. if in mode COAST, the beam dump events do not come out

In mode COASTPRE the timing event SX.S-COAST-CTM is sent out. – It is configured in the timing table at the time of a coast plateau.

Upon reception of this event the FGCs and RF freeze their functions.

April 2014

9

The main features of the new SPS COAST - 2

The FGCs are then in state IDLE.

From then on operation à la LHC. – Trims no more on function, but “actual beam

process” Generated when entering COAST

– “Actual beam process”= time slice of function containing single point.

– During COAST use NON-PPM property of the FGCs.

In mode COASTREC (= Coast Recover)– Beam dump events are sent out and then the event

SX.E-COAST.CTM– SX.E-COAST.CTM sends FGCs to TO_CYCLING– All changes from “Actual beam process” are

incorporated into the function

April 2014

FGC states in COAST

For all the different steps we will make heavy use of the SPS sequencer.

10

IMPROVEMENTS TO SPS ECONOMY

April 2014

11

3 Types of Economy

Goal: SPS should not pulse if there is no beam; can be disabled for testing

Full Economy– EDF demand for power consumption reduction or external condition– Will be set on the telegram and FGCs react to it– FGCs will stay on last point of last cycle (=13.5 GeV)

Dynamic Economy– No beam detected by BCTs: generation of timing event

Check implemented in FESA class by OP/SPS

– FGCs play special dynamic economy function upon reception of event– Different for different power converters and different cycles

Pulsing on correct dynamic destination only– Concerns power converters associated with the fast extractions and transfer

lines for LHC and HiRadMat

April 2014

12

Full Economy vs. Dynamic Economy

April 2014

Full Economy Dynamic Economy

t1

FGC builds dynamic economy function with parameter t1.

Corresponds to the time when the economy function should join the original one again.

13

FIRST TEST RESULTS - COAST

April 2014

14

First Tests & Status of Upgrades

All new timing features are available since March

All power converters in the SPS are now FGC– Almost all features are available – Can test power converter controls in SIMULATION– Still missing:

Upgrade to new timing events

Economy on dynamic destination

Increase of number of points for function to 5000

Allow dynamic economy if dI/dt != 0, within limits

– All missing FGC features will be finished during May

RFFG still under implementation– OP testing not started

April 2014

15

Sequence Manager – Set cycle “coastable"

Rule: only one cycle in supercycle, spare uncoupled

“coastable = true” in generation for cycle type

April 2014

16

Test of COAST – 1

Request coast on sequence manager: software button

April 2014

17

Test of COAST – 2

April 2014

18

Test of COAST – 3

April 2014

19

COAST – still to be tested/prepared

Concept of “actual beam processes” from LSA Trim during COAST via LSA and execution of trim with timing event Incorporation

Sequence to enter and exit COAST

April 2014

20

FIRST TEST RESULTS - ECONOMY

April 2014

21

Dynamic Economy - 1

FESA class: BCTECO running Triggers timing event SX.APECO-CT if BCT4 or 3 below threshold

April 2014

22

Dynamic Economy - 2

Trigger comes fast enough even for the shortest cycles – E.g. LHCPILOT(max time allowed 60 ms after injection)

April 2014

@ 36 ms

@ 36 ms

LHCPILOT

SFTPRO

23

Full Economy

April 2014

Still to come for FGCs: reaction to telegram

24

Other stuff to come

New application to look after FEI interlocks for power converters for fast extraction to LHC and HiRadMat

Sequences

SIS interlock update for FGCs

New application to manage economy

April 2014

25

Summary

During LS1 the SPS power converter control with ROCS has been replaced with the FGCD framework

This upgrade opened the door for wide ranging improvements and modifications. The most significant changes:– New SPS COAST– Improvements for SPS Economy

To fully exploit the flexibility with the FGCs, new features were necessary in the timing system and LSA

Many of the new features are already available and test results look very promising.– All timing features are available since March and fully functional.

Details are being finalized and testing continues until end of the summer.

April 2014