LHC BLM threshold modification reports


Information for the LHC BLM audit 10. June to 1. July 2008                4. July 2008

Scope of the audit:Scope of the audit are all aspects of the BLM system relevant to machine protection (machine protection being composed of damage protection and quench prevention). Components of the BLM system concerned: Energy deposition simulations, detectors, front-end electronics, threshold comparator, combiner, VME crate, DB, software tools, test procedures, interfaces to machine protection and energy receiver

Special emphasis on:
    Reliability and availability of the system
    Test and start-up procedures

Auditors:
Miguel Anjo                 IT/DM
Joachim Baechler         PH/DT2
Philippe Farthouat        PH/ATLAS
Stefan Haas                 PH/ESE
Stefan Lueders (chair)  IT/CO
Javier Serrano             AB/CO

Questions of auditors and answers to it

Report of the auditors (summary talk by S. Lueders, report)

LTC report on the report (B. Dehning)

remarks to the report from experts

Schedule:

Speaker

title

topics

 

Roland Garoby

General introduction

 

8:30

Bernd Dehning
(presentation)

BLM overview & System reliability

 

8:35

Thomas Weiler
(presentation)

Loss location maps

Loss locations

9:10

Agnieszka Priebe
(presentation)

Particle showers and  assessment of BLM Thresholds at cold magnets

Particle shower (energy deposition) simulations (GEANT4) for cold magnets and beam abort threshold settings

9:25

Till Boehlen
(presentation)

Assessment of BLM Thresholds in Collimation Regions for the LHC Startup

Particle shower (energy deposition) simulations (FLUKA) for collimators and beam abort threshold settings

9:40

coffee

9:55

Aurelien Marsili(presentation)

Daniel Kramer(presentation)

Slava Grishin
(presentation)

BLM system monitors

Ionization chambers and secondary emission monitors including saturation effects and production issues

10:05

Ewald Effinger(presentation)

Analogue electronics (including radiation tolerance and radiation testing

CFC, ADC, optical transmission

installation in the tunnel

10:55

Link to schematics and VHDL code:
https://edms.cern.ch/cedar/plsql/fullsearch.doc_search
 
document: EDA-00593
 
VHDL (CFC_TOP_FPGA.zip)

 

 Christos Zamantzas
(presentation)

BLETC (threshold comparator) and mezzanine card

 

11:25

BLM Mezzanine: EDA-780

BLETC: FPGA Quartus Project (zip, QuartusII 7.2 SP2)
       CPLD Quartus Project (zip, QuartusII 6 or higher) 
       EDA-00998

 

 

Launch

 

Jonathan Emery
(presentation)

 

Beam loss interface to machine protection and energy distribution

 

 

14:00

The BLECS combiner and survey card functionalities

 

Functional test bench for the BLECF tunnel card and BLECS combiner and survey card

 

Combiner:
http://cern.ch/blm/Electronics/BLECS_Combiner/BLECS-Fpga/BLECS-FPGA-Quartus-project
 
 
Schematics of the combiner (EDMS number: EDA-01660)
https://cern.ch/blm/Electronics/BLECS_Combiner/BLECS-Schematics/Rev3/BLECS_Combiner_Rev3.pdf
 
Portable BLM system (for the functional and tunnel test of the BLECF):
FPGA code:
https://cern.ch/blm/Electronics/BLECFT_portable_Testsystem_for_acqu_board/BLECFT_FPGA_description/
 
Schematic of the portable system(EDMS number: EDA-01329):
https://cern.ch/blm/Electronics/BLECFT_portable_Testsystem_for_acqu_board/BLECFT_Schematic/EDA-01329-V1_sch.pdf
 

 

Stephen Jackson
(presentation)

VME crate software

Data transfer of thresholds and running sums

14:30

Chris Roderick
(presentation)

Databases

Implementation
Access rights
MTF - Layout DB - LSA
Data maintenance (who manipulates data and where is the source)
Human and technical error prevention
Roll-back / flash-back

15:00

Grzegorz Kruk
(presentation)

Definition of data transfer

 

15:30

coffee

16:00

Mariusz Sapinski
(presentation)

Procedure of production, verification and transfer of the threshold values to LSA database

Expert data input to DB

16:10

Barbara Holzer
(presentation)

Test and start-up procedures

 

16:30

Abbreviations:

 

Machine name

 

CFC

BLECF

Charge to frequency converter (includes an FPGA), front end electronics, tunnel and alcoves

BLM

 

Beam loss monitoring system

SEM

 

Secondary emission monitor

IC

 

Ionization chamber

combiner

BLECS

Combine and survey card (includes an FPGA), backend electronics, surface buildings

Threshold comparator

BLETC

Threshold comparison and data treatment (includes an FPGA), backend electronics, surface buildings

 

BLECF

Test unit for CFC cards (includes an FPGA)

MTF

 

Manufacturing and Test Folders travellers

LSA

 

LHC Software Architecture database

Layout DB

 

LHC Layout database

 

 

 

 

 

 

 

 

 

 

Information about the BLM system:
A special webpage will be compiled in May. For the time being information can be found under
http://cern.ch/blm  “talks and papers”.


Rooms booked for the audit:
Tue 10/06/2008 08:30 - 17:30 864 1-C02 (system presentations - schedule on the webpage)
Thu 12/06/2008 14:00 - 17:30 864 1-C02 (Q&A session)
Mon 16/06/2008 afternoon tba (Auditors only)
Wed 25/06/2008 14:00 - 16:00 864 1-C02 (report of the Auditors, S. Lueders)
 

Documents:

 

BLM system introduction:

  • Beam Loss Monitor Specification (EDMS)

  • IEEE NSS 2005, E.B. Holzer et al. (presentation, paper): Beam Loss Monitoring System for the LHC (10.2005)

Ionization chamber, energy deposition simulation:

  • PhD Thesis, M. Stockner (pdf): Beam Loss Calibration Studies for High Energy Proton Accelerators (10.2007)

  • Master Thesis, M. Hodgson, Ionisation chamber design studies thesis [pdf]

SEM:

  • IEEE NSS 2007, D.Kramer (presentation, paper): Very High Radiation Detector for the LHC BLM System Based on Secondary Electron Emission (11.2007)

Front-end electronics:

  • Diplom thesis CFC (W. Friesenbichler) [pdf.gz] (5.2002)

  • DIPAC, E. Effinger (poster (pdf, odp), paper): Single Gain Radiation Tolerant LHC Beam Loss Acquisition Card

  • LECC, E. Effinger (talk, paper): The LHC beam loss monitoring system’s data acquisition card (2006)

  • LECC, J. Emery (poster, paper): Functional and Linearity Test System for the LHC Beam Loss Monitoring Data Acquisition Card

Threshold comparator:

  • IEEE NSS 2006, C. Zamantzas, (poster, paper), An FPGA Based Implementation for Real-Time Processing of the LHC Beam Loss Monitoring System’s Data

  • IEEE NSS 2007, C.Zamantzas (presentation, paper), The LHC Beam Loss Monitoring System's Data Contribution to other Systems (2007)

Combiner and interfaces to machine protection and energy receiver:

VME crate: (n.a.)

 

DB:

  • M. Sapinski, (pdf, doc), Database specification

Software tools:

  • IEEE NSS 2007, C.Zamantzas (presentation, paper), The LHC Beam Loss Monitoring System's Data Contribution to other Systems

Reliability and availability of the system:

  • PhD Gianluca Guaglio (Presentation.ppt, Thesis.pdf): BLMS Dependability (12.2005)

  • AB seminar, G. Guaglio, Reliability study of the BLM system, (pdf) (4.2006)

Test and start-up procedures:

 

 

 

 


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