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---+++!! <font color="#ff0000">This page is obsolete, please go to http://wikis.cern.ch/display/expcomm/DIP+LHC</font>
%MAKETEXT{"Welcome to the [_1] Twiki. LEADE is the working group for the LHC Experiment-Machine Data Exchange and the main purpose of this web is the description of the items to be exchanged. The minutes of LEADE are recorded in http://lhc-data-exchange.web.cern.ch/lhc-data-exchange/ The functional specification is available in the EDMS document 701510 by E. Tsemelis. New requirements have been added since by LHC operations, listed in http://cern.ch/lhc-commissioning/systems/data-exchange/data-exchange.htm ." args="<nop>%WEB%"}% 
---++ 
---++!! Data exchanged between the LHC machine and experiments 

Data exchange is via DIP (Data Interchange Protocol) as described in https://edms.cern.ch/file/457113/2/DIPDescription.doc. DIP is maintained by IT/CO http://itcofe.web.cern.ch/itcofe/Services/DIP/welcome.html. The following chapters describe the items to be exchanged, their location and estimated availability.
Announcements of publication availability, new requirements, changes, etc. are announced through the  *lhc-exp-coms@cern.ch*  mailing list.

In the LHC machine environment all floating point data is typically produced as _double_ (64-bit) and will be published as such. _During the conversion some loss of precision may occur_.

---+++!! Machine to experiments 

All publications from LHC are under dip/acc/LHC/ followed by the category of interest (Beam, RunControl, Safety, etc) and the publication items. The following tables depict the publication details. Additional information on some of the publications is available at http://ts-dep-lea-int.web.cern.ch/ts-dep-lea-int/dataexchange-DIP.htm

---++++!! Available publications
Publications which are fully defined and currently published. They can still be subject to some small modifications.

| *Measurement* | *DIP item name/source data description* | *Publication contact* | *Data contact* | *Volume Bytes* | *Frequency*  | 
| | * Beam and machine observables * | ||||
| Total beam intensity | dip/acc/LHC/Beam/Intensity/* (Beam1 and 2)/http://bdidev1.cern.ch/bdisoft/development/BDI-Domains/bdeyelids/bdeyelids.php?currentSelection=GI&currentDomain=LHC&currentInstrument=BCTDCLHC ExperimentAcquisition property - Please note that there are two redundant beam intensity publications and the one which is flagged as valid is published to DIP | K. Kostro | AB/BI, M.Ludwig  | small  | 1 Hz  |
| Individual bunch intensities  | dip/acc/LHC/Beam/IntensityPerBunch/* (Beam1 and 2)/* (A and B)  [[http://bdidev1.cern.ch/bdisoft/development/BDI-Domains/bdeyelids/bdeyelids.php?currentSelection=GI&currentDomain=LHC&currentInstrument=BCTFRLHC][BI documentation]] ExperimentAcquisition property - Please note that there are two redundant bunch intensity publications and the one which is flagged as valid is published to DIP  | K. Kostro | AB/BI, M.Ludwig | ~50 KB  | 1 Hz | 
| Average 2D beam size | dip/acc/LHC/Beam/Size* (Beam1 and 2) http://bdidev1.cern.ch/bdisoft/development/BDI-Domains/bdeyelids/bdeyelids.php?currentSelection=GI&currentDomain=LHC&currentInstrument=BSRTSLHC !AcqToExperiments property | K. Kostro  | AB/BI, A.Guerrero | 1 KB  | 1 Hz | 
| Luminosity cdte mean  | dip/acc/LHC/Beam/LuminosityAverage/* [[http://bdidev1.cern.ch/bdisoft/development/BDI-Domains/bdeyelids/bdeyelids.php?currentSelection=GI&currentInstrument=BRASCLHC&currentDomain=LHC][http://bdidev1.cern.ch/bdisoft/development/BDI-Domains/bdeyelids/bdeyelids.php?currentSelection=GI&curren;tInstrument=BRASCLHC&curren;tDomain=LHC]] Acquisition property  | K. Kostro  | AB/BI, S.Bart Pedersen  | 16  | 1 sec  | 
| Luminosity cdte b-by-b | dip/acc/LHC/Beam/LuminosityPerBunch/* [[http://bdidev1.cern.ch/bdisoft/development/BDI-Domains/bdeyelids/bdeyelids.php?currentSelection=GI&currentInstrument=BRASCLHC&currentDomain=LHC][http://bdidev1.cern.ch/bdisoft/development/BDI-Domains/bdeyelids/bdeyelids.php?currentSelection=GI&curren;tInstrument=BRASCLHC&curren;tDomain=LHC]]  Acquisition property | K. Kostro  | AB/BI, S.Bart Pedersen  | 28 512  | 10 sec  |
| Luminosity Gas mean  | dip/acc/LHC/Beam/LuminosityAverage/*  http://bdidev1.cern.ch/bdisoft/development/BDI-Domains/bdeyelids/bdeyelids.php?currentSelection=GI&currentDomain=LHC&currentInstrument=BRASGLHC Acquisition property | K. Kostro  | AB/BI, S.Bart Pedersen  | 16  | 1 sec  |
| Luminosity Gas b-by-b  | dip/acc/LHC/Beam/LuminosityPerBunch/*  http://bdidev1.cern.ch/bdisoft/development/BDI-Domains/bdeyelids/bdeyelids.php?currentSelection=GI&currentDomain=LHC&currentInstrument=BRASGLHC Acquisition property  | K. Kostro  | AB/BI, S.Bart Pedersen  | 28 512  | 10 sec  |
| Abort Gap Beam Current | dip/acc/LHC/Beam/AbortGapIntensity/*  http://bdidev1.cern.ch/bdisoft/development/BDI-Domains/bdeyelids/bdeyelids.php?currentSelection=GI&currentDomain=LHC&currentInstrument=BSRALHC Acquisition property | K. Kostro  | AB/BI, S.Bart Pedersen  | + 3*640 doubles  | 1 sec  |
| Average Beam Loss  | dip/acc/LHC/Beam/BLM/LSS* integrated beam losses 10us, 633ms, 1310ms from monitors 260m around IP. Data is coming from BLM concentrator, which itself gets it from BLM monitors as described in http://bdidev1.cern.ch/bdisoft/development/BDI-Domains/bdeyelids/bdeyelids.php?currentSelection=GI&currentDomain=LHC&currentInstrument=BLMLHC | K. Kostro  | BLM concentrator, M.Misiowiec | 400 doubles and monitor names | 1 sec  |
| Beam Loss thresholds | dip/acc/LHC/Beam/BLM/LSS*_thr Beam loss thresholds for 10us, 633ms, 1310ms for BLM monitors 260m around IP. Thresholds are calculated in the BLM concentrator and are adjusted by operation | K. Kostro  | BLM concentrator, M.Misiowiec | 400 doubles and monitor names | on change |
| HOR &amp; VER Positions  | dip/acc/LHC/Beam/BPM Vertical and horizontal positions from selected BPMs. Includes BPM names and error strings. They are published as arrays i.e. the position of a BPM which name is at index _i_ will be at index _i_. If more BPMs are added, they will be added at the end but if you use it in a program, make a check if the name is at the expected position. Value may be not correct if the corresponding error string is not empty. Data is from beam orbit concentrator OFSU.LHC which itself gets it from closed orbit position measurement as descibed in http://bdidev1.cern.ch/bdisoft/development/BDI-Domains/bdeyelids/bdeyelids.php?currentSelection=GI&currentDomain=LHC&currentInstrument=BPMLHC The positions are given in micro-meter ('um') w.r.t. to the BPM center, which in usually about the same as the design orbit. The BPM misalignment errors are estimated to about 0.2-0.5 mm r.m.s. Note:positions from the 2 ATLAS Roman Pots are missing yet | K. Kostro  | R. Steinhagen | 48 doubles, status strings and monitor names  | 1 sec  |
| Beam energy | dip/acc/LHC/Beam/Energy multiply by 120 to get MeV value | K. Kostro  | AB/CO, I. Kozsar | 1 int | on change up to 10Hz |
| Collimator positions  | dip/acc/LHC/Machine/CollimatorPositions/*  8 position values from the _MeasuredCornerPositions_ property, see: https://edms.cern.ch/file/934341/0.1/LHC-TC-ES-0002-00-10.pdf Positions and gaps in mm, positions relative to the collimator center| K. Kostro  | AB/ATB M. Donze  | 8 doubles per collimator  | 1 sec  |
| TCDQ Collimator positions  | dip/acc/LHC/Machine/TCDQPositions/*  2 position values from the _MeasuredCornerPositions_ property, see: https://edms.cern.ch/file/934341/0.1/LHC-TC-ES-0002-00-10.pdf Positions  in mm, relative to the collimator center| K. Kostro  | AB/ATB M. Donze  | 2 doubles per collimator  | 1 sec  |
| TED Dump position  | dip/acc/LHC/Machine/TEDPosition/*  position from the _Status_ property, position=2 means OUT (beam through), position=3 means IN (dump), other values: 0 (unknown), 1(installation), 4 (transport), 5 (undefined position) | K. Kostro  | AB/ATB M. Donze  | 1 int  | on change |
| Injection lines intensity  | dip/acc/LHC/Beam/IntensityInj/* (TI2.29125, TI8.87750)  The size of totalIntensityHigh is alvays one and unit is in charges with a unit-exponent of '10' so for example, the nominal LHC pilot (5E9 charges) would give "0.5". You have to check the value of cycleName as not all cycles are for LHC. The cycle names are assigned by operation and can change with time. | K. Kostro  | AB/BI L. Jensen  | 1 float + 1 string | every SPS cycle |
| Luminosity Scan | dip/acc/LHC/Beam/LuminosityScan  | K. Kostro  | S.M. White | numbers and strings | on change |

| *Item* | *DIP item name/source data description* | *Publication contact* | *Data contact* | *Volume Bytes* | *Frequency*  |
| | * Run Control * | ||||
| Machine Mode  | dip/acc/LHC/RunControl/MachineMode accelerator mode string defined by LHC operation https://edms.cern.ch/cedar/plsql/doc.info?cookie=8501908&document_id=865811&version=1.0&p_tab=TAB6 | K. Kostro  | AB/OP, M. Lamont  | string | on change |
| Beam Mode  | dip/acc/LHC/RunControl/BeamMode beam mode string defined by LHC operation https://edms.cern.ch/cedar/plsql/doc.info?cookie=8501908&document_id=865811&version=1.0&p_tab=TAB6 | K. Kostro  | AB/OP, M. Lamont | string | on change |
| Beam type | dip/acc/LHC/RunControl/BeamType/* (Beam1 and 2) beam type encoding defined by LHC operation http://wwwpsco.cern.ch/private/timing/timing/Seq/tgmLines.html?mode=OPER&net=LHC&mch=LHC | K. Kostro  | AB/CO, I. Kozsar | 1 int | on change |
| Safe beam flags | dip/acc/LHC/RunControl/SafeBeam/* (Beam1 and 2) flags encoding defined by LHC operation http://wwwpsco.cern.ch/private/timing/timing/Seq/tgmLines.html?mode=OPER&net=LHC&mch=LHC | K. Kostro  | AB/CO, I. Kozsar | 1 int, bitmap | on change |
| Fill number | dip/acc/LHC/RunControl/FillNumber LHC fill number http://wwwpsco.cern.ch/private/timing/timing/Seq/tgmLines.html?mode=OPER&net=LHC&mch=LHC | K. Kostro  | AB/CO, I. Kozsar | 1 int | on change |
| Circulating Bunch Configuration | dip/acc/LHC/RunControl/CirculatingBunchConfig/* (Beam1 and 2) Circulating Bunch Configuration, per beam. Contains an array which encodes mapping of circulating bunches to RF buckets i.e. the first element contains the RF bucket number of the bunch 1 etc. If the value is 0 then there is no corresponding bunch. | K. Kostro  | AB/OP M. Lamont | 2808 integers | on change |
| Injection Bunch Configuration | dip/acc/LHC/RunControl/InjectionBunchConfig/* (Beam1 and 2) Injection Bunch Configuration, per beam. Contains an array which encodes mapping of injected bunches to RF buckets i.e. the first element contains the RF bucket number of the bunch 1 etc. If the value is 0 then there is no corresponding bunch. The 'ACTIVE' field will be set to _true_ for the injected beam and to _false_ for the other beam. | K. Kostro  | AB/OP M. Lamont | 288 integers | on change |

| *Item* | *DIP item name/source data description* | *Publication contact* | *Data contact* | *Volume Bytes* | *Frequency*  |
| | * Handshakes * | ||||
| LHC handshake | dip/acc/LHC/Handshake/* Injection, Adjust and Beamdump handshakes from LHC operations, see http://cern.ch/lhc-commissioning/systems/data-exchange/data-exchange.htm | K. Kostro  | AB/OP M. Lamont | string | on change |

| *Item* | *DIP item name/source data description* | *Publication contact* | *Data contact* | *Volume Bytes* | *Frequency*  |
| | * Safety * | ||||
| SPS probe beam flag | dip/acc/LHC/Safety/* (!MaxSpsProbeBeamA and B) SPS Probe Beam Flag Threshold which gives the maximum beam intensity that can be injected into an empty LHC (probe beam). Value is in units of 1E8 charges. | K. Kostro  | AB/OP J. Wenninger | 1 integer | on change | 

| *Item* | *DIP item name/source data description* | *Publication contact* | *Data contact* | *Volume Bytes* | *Frequency*  | 
| | * Miscellaneous * | ||||
| Post Mortem Timestamp | dip/acc/LHC/Timing/PostMortem Postmortem Event. Typically postmortem request is delivered as HW signal but this software event allows to determine the timestamp of the last PM event to be included with the PM data | K. Kostro  | AB/CO I. Kozsar| small | on change | 

---++++!! Missing publications
Publications which are planned but delayed because equipment is not available yet or for other reasons
| *Missing publication* | *DIP item name/source data description* | *Publication contact* | *Data contact* | *Volume Bytes* | *Frequency*  | *Estimated availability*  |
| Average bunch length | dip/acc/LHC/Class/Property/Device | K. Kostro  | AB/RF A.Butterworth  | 8  | 1 min  | <font color="#ff0000">after 2008</font> |
| Total longitudinal distribution | dip/acc/LHC/Beam/LongitunalDistribution | K. Kostro  | AB/BI  | 285.120  | 1 min  | <font color="#ff0000">after 2008</font> |

---+++!! Experiments to machine 

Whenever the same kind of publication is expected from several experiments, they shall follow the same naming schema and field definitions so that they can be used by LHC controls in a common way. For instance the same hanshake names and values are expected from all experiments. The following table defines this.

All publications used pricipally by LHC operation shall be under /dip/EXPERIMENT/LHC/. When a single field is published, the field name shall be the DIP default (&#95;&#95;DIP_DEFAULT&#95;&#95;). When several items which belong together it is preferred that they are published as a single DIP publication.
We will always try to prototype the publications with one experiment and others can follow then.

| *Item* | *DIP item name/source data description* | *CMW device and property* | *Required field names and types* | *Frequency*  | *Example to follow* |
| Experiment handshake | dip/EXPERIMENT/LHC/Handshake/* (EXPERIMENT_INJECTION, EXPERIMENT_ADJUST, EXPERIMENT_BEAMDUMP) Handshake details are described in http://lhc-commissioning.web.cern.ch/lhc-commissioning/systems/data-exchange/handshakes.htm | device name: DIP.EXPERIMENT (e.g. DIP.ATLAS) properties: !InjectionHandshake, !AdjustHandshake, !BeamdumpHandshake | Field name: &#95;&#95;DIP_DEFAULT&#95;&#95;, field type: String | on-change | /dip/ALICE/LHC/Handshake/* |
| CMS HF Luminosity | dip/CMS/HF/LumiData | !DIP.CMS/HF.LumiData | As published | on-change | specific? |
| CMS HF Luminosity histogram | dip/CMS/HF/LumiDataLH | !DIP.CMS/HF.LumiDataLH | As published | on-change | specific? |


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Topic revision: r50 - 2010-03-02 - KrisKostro
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