Status of the Roman Pot Movement System and the Interlocks

Mario Deile10.03.2010

Achieved during the Shutdown

Lessons from the 2009 run:

• RP movement system operational but:• stability issues• position calibration not satisfactory because of HW interventions after the calibration

• Interlocks functional according to machine requirements but:• some less critical components missing (movement inhibit, emergency extraction)• some functionalities implemented on a “bricolage” level (OVERRIDE1 flag given by shorting an interlock box input with a cable)

Improvements during the shutdown:

• Concerted action of the experts to track errors and improve stability • New LVDT position calibration• New geometrical survey of the RP, this time including the BPMs• Systematic test of all RP microswitches, controlled by CCC and TOTEM DCS• Construction of a control panel in the TOTEM CR with

• emergency push buttons (e.g. RP extraction via springs)• key-protected switches for OVERRIDE signals and movement inhibit

• First part of interlock tests done

Microswitches and Electrical Stoppers Limiting the RP Travel

from Xavier Pons

Interlock Block Diagramme

Home Switch 1AND

RP_HOME 1

RP_HOME 12x 12

LVDT 1

FESA

comparePosition 1

Position 12

x 12

Limits

GMT (SMP)

CIBU 1(double)

ALL_RP_HOME

DEVICE_ALLOWED

USER_PERMIT1(Beam 1)

USER_PERMIT1(Beam 2)

Home Switch 12

LVDT 12

x 12

compare

CIBF 1INJECTION_PERMIT

(Beam 1)

CIBF 2INJECTION_PERMIT

(Beam 2)

TOTEM Operator OVERRIDE1 OR

STABLE_BEAM

NOT_BACK_HOME

IN MOTOR CONTROL RACK

ORCIBU 2(single)lent to CMS until spring

2010

DAQTR_OUT USER_PERMIT2(Beam 1 + 2)

IN S2E11 (TRIGGER/DAQ) RACK

x 12ALL_RP_HOME Motor

Control

DAQTR 1AND

DAQTR_OUT 1

DAQTR_OUT 12x 4

DAQTR 4

x 4

DAQTR DOWN

OVERRIDE2

all machine flags

x 12

TOTEM INTERLOCK CARD

IN CMSINTERLOCK RACKS1E08

OR

AND

ANDAND

all machine flags

ALL_LVDT_OK

ALL_LVDT_OK

hardwired to 1 until needed

Remaining Issues

Near and medium future:

• Completion of interlock tests scheduled for Fri/Sat 12/13.03. (needs very special machine conditions and collimation expert operations)• Stability of movement control system to be observed (still occasional crashes of PXI or FESA machines; not seen during operation).• No further HW/SW modifications allowed before and during the run (would invalidate the interlock tests)• Train semi-experts for depannage of the motorisation computers• During the run: repeated BLM response studies (cooperation of TOTEM + collimation group + BE-BI)• Try to reconcile the collimation alignment and the BPM measurement using the survey

Long-term plans:

• Improvements of the interlock logic (to be implemented on our spare interlock box):• Addition of a manual injection inhibit (so far, injection permit fully determined by RP home switches)• Separation of injection and beam permits for beam 1 and 2

• Problem: state of the OVERRIDE keys not transmitted to DCS no remote monitoring• Addition of an emergency RP extraction possibility in the CCC ?

Backup Material

Prevent machine mode changes while detectors not prepared:

Handshakes via DIP

functional in 2009 handshake test done

Injection Permit hardware signal from interlock card, based on RP “home” microswitches

functional in 2009 microswitch test done,

injection permit test done

Prevent illegal and unwanted RP positions and movements:

automatic retraction hardware signal from interlock card, based on RP position, machine mode

functional in 2009 new position calibration done,

interlock test partly done

emergency extraction button not impl. in 2009 implemented and tested

movement inhibit not impl. in 2009 implemented and tested

Dump the beam in case of illegal RP position:

USER PERMIThardware signal from interlock cardbased on RP position, machine mode and position limits from collim. system

functional in 2009 new position calibration done,

interlock test partly done

Possibility of expert operation outside “STABLE BEAMS” (collimation group studies):

OVERRIDE1 signal (input to interlock card)

crude solution in 2009

key switch implemented and tested on 13.02.

Summary: Interlock Functionalities and Status

System Overview.

CCCTOTEM

FESA Server

NI PXI

Motor Control

Roman pots

Position requests, limits

Position requests

Alarms

Alarm

s

Extra

ctio

n

Emer

genc

y Ext

ract

ion

CIBU, CIBF

Interlock control rack (common with CMS)

USER_PERMIT, INJECTION_PERMIT

FESA ICD

DIM ICD

Interlock card

GMT

Mac

hin

e m

od

e O

VE

RR

IDE

STABLE_BEAMS, DEVICE_ALLOWED

microswitches

Interlock Block Diagramme (part 2)

Motor Control

ALL_RP_HOME

all machine flags

ALL_LVDT_OK

interlock signals

zoom

NOT_BACK_HOME BACK_HOME

x6

Bea

m 1

USER_PERMIT1_B1

USER_PERMIT1_B2

OR

OR

x6

OR

OR

Bea

m 2

ALL_LVDT_OK

ALL_RP_HOME

RP_HOME(i) [i = 1, … 12]

all machine flagsIn

form

atio

nIn

form

atio

nUSER_PERMIT2

x6

x6

EXTRACT

(springs via “disable”)

EXTRACT

EXTRACT

EXTRACT