1. Data providers Volume & Type of Analysis Kickers
Etienne CARLIER
AB/BT
LHC Post Mortem Workshop – I
16-17 January 2007

2. Outline Equipment Post-Mortem System Kicker Systems
Transient Recording
Data Analysis
Post-Mortem Buffer
Data Volume
Summary
LHC Post Mortem Workshop – Etienne CARLIER, AB/BT
17/01/2007

3. LHC Tune & Aperture Kickers H / V Beam 1 & 2
LBDS Extraction & Dilution Kickers + TCDS & TCDQ protection devices
Beam 1 & 2
LHC
Injection Kickers
Beam 1
Injection Kickers
Beam 2
LHC Post Mortem Workshop – Etienne CARLIER, AB/BT
17/01/2007

4. Post-Mortem System Initial Assumptions
Post-mortem system is the only way to verify the “correct operation” of each kicker systems during a beam dump action:
Confirm that the Extraction and Dilution kicker systems have pulsed correctly after detection of a valid dump trigger request.
Confirm that the Injection & Tune/Aperture kicker systems have not pulsed if no trigger requests have been issued at the beam dump trigger time.
As kicker systems are fast pulsed systems (typ. kick duration <= 1 beam revolution duration), post-mortem data acquisition must be based on single shot acquisitions with synchronisation better than 20ns.
LHC Post Mortem Workshop – Etienne CARLIER, AB/BT
17/01/2007

5. Post-Mortem System Initial Assumptions (cont.)
Set of tools to perform an in-depth “autopsy” of the different kicker systems after a beam dump action with the objectives
To identify the cause of beam dump request if issued by one of the kicker systems,
To analyse the state of each kicker system before, during and after the beam dump action,
To trace back the history of the different actions performed on the operational parameters of each kicker systems,
To be able to understand if or to confirm that these actions were appropriate.
To come to an exact conclusion concerning the execution of the dump action all required information must have been correctly acquired, retrieved, analysed and recorded:
What happens?
When it happens?
Why it happens?
LHC Post Mortem Workshop – Etienne CARLIER, AB/BT
17/01/2007

6. Post-Mortem System Data Acquisition
Trending
Continuous sequential data logging at a fixed acquisition frequency
Shot-by-Shot Logging
Data acquisition and logging synchronised with a specific beam process (i.e. injection)
Alarm
Acquisition and archiving of unforeseen process events detected by equipment surveillance programs
Transient Recording
Pre & Post trigger data acquisition after reception of an external asynchronous trigger
Logbook
Record of actions performed on equipment hardware and software by CCC and equipment specialists
LHC Post Mortem Workshop – Etienne CARLIER, AB/BT
17/01/2007

7. Post-Mortem System Data Correlation
Beam Dump
Trending
UTC
Shot-by-Shot
UTC
Alarm
UTC
Transient
UTC
Why?
Logged Data (Trends + Shot-by-Shot + Alarms + Logbook)
What?
Post-Mortem Buffer
When?
UTC Timestamp
Correct conclusions will be possible only after a precise correlation of the different acquired data.
LHC Post Mortem Workshop – Etienne CARLIER, AB/BT
17/01/2007

8. Kicker Systems Data Type
State
Timing
Strength
Process Data Slow Control (PLC)
Pulsed Data Fast Control (VME & CompactPCI)
Trending
Magnet Temperature, Vacuum Level, Thyratron Heater Level, Voltage Tracking (low frequency)…
Shot-by-Shot Logging
Magnet Current, Beam Current, BIS Window, User Dependent Settings, Pulsed Signals, Voltage Tracking (high frequency)…
Alarm
Equipment State, Sub-System State, Acquisition Error, Interlock Warning, Interlock Fault, Fast Interlock…
Transient Recorder
Voltage Tracking (high frequency), Magnet Current, Beam Current, BIS Window,
LHC Post Mortem Workshop – Etienne CARLIER, AB/BT
17/01/2007

9. Kicker Systems Data Acquisition
Trending
Shot-by-Shot
Alarm
Transient Recorder
Injection Kickers
Yes
Aperture & Tune Kickers No
Extraction & Dilution Kickers
: with equipment low level data pre-analysis
LHC Post Mortem Workshop – Etienne CARLIER, AB/BT
17/01/2007

10. Kicker Systems Data Acquisition Triggering
Trigger Signal
Acquisition Accuracy
UTC Reference
Trending
Timer event (Fixed Frequency)
1 period
RT task execution (FESA Scheduling)
Shot-by-shot Logging
Fast Prepulse
5 ns
RT task execution (CTR*)
Alarm
Timer event & Timing event
1 ms
Transient Recorder
Dump Trigger
* : CTR external trigger interrupt timestamp
LHC Post Mortem Workshop – Etienne CARLIER, AB/BT
17/01/2007

11. Transient Recording Hardware
Digitizer
Characteristics
System
ACQIRIS DC265
150MHz,
500 MS/s, 8bit, 2 Mpts/ch
Injection Kicker  Synchronisation
ACQIRIS DC270
250 MHz, 1 GS/s, 8 bit, 128 kpts/ch
Extraction Kicker  Synchronisation
NI PXI 5122
100 MHz, 100 MS/s, 14 bit, 8 MB/ch
Extraction Kicker  Strength
Injection Kicker  RCPS*
* Resonant Charging Power Supply
LHC Post Mortem Workshop – Etienne CARLIER, AB/BT
17/01/2007

12. Transient Recording Triggering
Injection Kickers & Tune & Aperture Kickers
Detection of a beam permit loop signal change from TRUE to FALSE at the CIBU status output signal, or
Reception of a dedicated CTIM event
Independent trigger signal per beam
LBDS Extraction and Dilution Kickers
Detection of a beam permit loop state change from TRUE to FALSE at the LBDS Trigger Synchronization Unit (TSU) frequencies detection systems.
LHC Post Mortem Workshop – Etienne CARLIER, AB/BT
17/01/2007

13. Transient Recording Injection Data
Shot-by-shot data and Transient Recorder data are acquired through the same hardware channels.
LHC Post Mortem Workshop – Etienne CARLIER, AB/BT
17/01/2007

14. Transient Recording LBDS Data
LHC Post Mortem Workshop – Etienne CARLIER, AB/BT
17/01/2007

15. Transient Recording Analysis
Two different levels of Analysis
XPOC – External Post Operation Check [BG]
What happened during the dumping process with the beam?
IPOC – Internal Post Operation Check
How performed the different sub-systems during the dumping process?
IPOC analysis for LBDS extraction kicker
Kick Synchronisation Analysis
Kick rise-time,
Kick length,
Kick synchronisation with beam.
Kick Amplitude Analysis
Kick normalization with beam energy
100 % kick measurement,
Kick first overshoot,
Kick second overshoot.
LHC Post Mortem Workshop – Etienne CARLIER, AB/BT
17/01/2007

16. Post-Mortem Buffer Dump Trigger PM Data Request PM Buffer
Data Acquisition
Header
Transient Recorder Raw Data
Transient Recorder Analyzed Data
Analysis Configuration Data
Internal Analysis (IPOC)
Analysis Results
Analysis Configuration Data
PM Buffer Ready
Alarm Data
Logging Data
PM Data Request
Record PM Buffer
Snapshot of trending data, alarm states and transient data at dump trigger request time
LHC Post Mortem Workshop – Etienne CARLIER, AB/BT
17/01/2007

17. Kicker Systems Data Volume
Trending
Shot-by-
Shot
Alarm
Transient
Recorder
Injection Kickers
256 bytes / sec
6 MB / shot
~30
6 MB / record
Tune & Aperture Kickers
128 bytes / sec
~15
2 MB / record
Extraction & Dilution Kickers
2 kB / sec
~150
40 MB / record
TCDS & TCDQ ~5
128 bytes
LHC Post Mortem Workshop – Etienne CARLIER, AB/BT
17/01/2007

18. Summary
Data will be acquired and logged through different acquisition mechanisms.
Post-Mortem buffer snapshot is not sufficient to get a complete view of kicker system operational behaviour.
Correlation between the different acquired data will be done through the UTC acquisition timestamp attached to each data.
System boot-strapping:
Raw data logging will be available at machine start-up,
Progressive implementation of IPOC analysis with basic functionalities available at machine start-up.
Reliability of data acquisition chain remains an issue.
LHC Post Mortem Workshop – Etienne CARLIER, AB/BT
17/01/2007