LHC Collimators Low Level Control:
Report on EN/STI interventions in TS1
A. Masi
Contents
1.
2.
Minor upgrades and interventions performed
Possible actions for TS2
A Masi, LHC Collimators Low Level Control: Report on EN/STI interventions in TS1
1–Minor upgrades and interventions performed
Main software changes:
• MDC (Motor Drive Control) :
 bug of 5 um error on the profiles execution during change of
direction successfully fixed
 publication of the system uptime (to easily detect UPS power
cuts) added
• PRS (Position Readout & Survey) :
 publication of the system uptime (to easily detect UPS power
cuts) added
• FESA Class:
 publication of the PRS and MDC uptime added
•Temperatures UNICOS Software:
 TDI temperatures put away from interlock logic
 MP tests relaunched in all the tunnel
A Masi, LHC Collimators Low Level Control: Report on EN/STI interventions in TS1
1–Minor upgrades and interventions performed
Actions performed :
• TCTPH.4R2.B2 Resolver Left Upstream saturation issue:
 resolver acquisition custom Europa card, NI cable and motor
exchanged
 bad connection on the pin 12 of the tunnel resolver cable
found and fixed
• TCLA.A7R7.B1 LVDT Gap Upstream issue (sigma around 40 um):
 NI cable and DAQ card replaced
• TCLIA_4L8_RU temperature probe Rigth Upstream problem:
 False contact on the collimator cable found and fixed
A Masi, LHC Collimators Low Level Control: Report on EN/STI interventions in TS1
1–Minor upgrades and interventions performed
Actions performed :
• SLAC COLLIMATOR successfully installed in BA5:
 Outer switches hardware connected to the BIC
 FESA device instantiated (still FESA 2.0)
 Axes need to be calibrated remotely
A Masi, LHC Collimators Low Level Control: Report on EN/STI interventions in TS1
1–Minor upgrades and interventions performed
LHC Collimators temperatures tests:
Movement cycles of all the collimators in order to detect
perturbation on the temperature readings

One direct correlation found: TCDIV 29012 Left Upstream- Potential local
cable false contact. Sensor need to be bypassed
A Masi, LHC Collimators Low Level Control: Report on EN/STI interventions in TS1
1–Minor upgrades and interventions performed
LHC Collimators temperatures tests:
 120 sensors affected by strange short spikes to 52 °C in the time window of
repeated motion cycles. The short spike is anyway filtered in the current
PLC reading logic. Problem under investigation
A Masi, LHC Collimators Low Level Control: Report on EN/STI interventions in TS1
1–Minor upgrades and interventions performed
LHC Collimators temperatures tests:
 Strange short spikes to 52 °C experienced in the time window of repeated
motion cycles
A Masi, LHC Collimators Low Level Control: Report on EN/STI interventions in TS1
1–Minor upgrades and interventions performed
LHC Collimators temperatures tests:
 Strange short spikes to 52 °C experienced in the time window of repeated
motion cycles

A Masi, LHC Collimators Low Level Control: Report on EN/STI interventions in TS1
1–Minor upgrades and interventions performed
LHC Collimators temperatures tests:
 Strange short spikes to 52 °C experienced in the time window of repeated
motion cycles

A Masi, LHC Collimators Low Level Control: Report on EN/STI interventions in TS1
2–Possible actions for TS2
Possible actions for TS2:
• Possible change of the temperatures interlock logic
 generate an interlock only if both sensors of the same jaw
overcome the threshold
 gradient in time: ignore the sensor if dT/dt > XX deg/s
 difference jaw sides: ignore if |Delta(upstreamdownstream)|>Delta_T max
 max temperature un-physical: ignore if T > Tmax
• Update of the PXI 10 MHz synchronization distribution
A Masi, LHC Collimators Low Level Control: Report on EN/STI interventions in TS1