HC Review F. Rodriguez-Mateos Powering tests The outcome of the work conducted within HCWG and many discussions among colleagues

HC Review F. Rodriguez-Mateos Outline  Starting conditions and pre-requisites  Powering of the warm magnet circuits  Powering of the superconducting circuits  Estimates of the durations  Controls applications and tools required to start up  How to improve and save time  Special tests on the first sector  Failure scenarios and implications  Outlook: LSS L8  Appendix: the role of “Mr Circuit”

HC Review F. Rodriguez-Mateos Starting conditions and pre-requisites (1/2)  Equipment All components of the circuit installed, in nominal configuration and nominal operating conditions  Infrastructure Electrical distribution (including UPS) Cooling and ventilation  Safety AUG, fire detection, red telephones, evacuation signals, oxygen deficiency detectors, emergency lighting, water-level detection Alarm transmission and monitoring (CSAM) operational  Access Access is only authorized to personnel involved in the tests Fencing and signals will be put in place

HC Review F. Rodriguez-Mateos Starting conditions and pre-requisites (2/2)  Individual System Tests Completed and summary results registered in MTF  Tests of Power Converters in short-circuit Completed and summary results registered in MTF  Interlock tests Completed and summary results registered in MTF  Controls FCR installed and operational Equipment supervision applications operational Applications ready to run and monitor equipment Timing Logging, Alarms, Post-Mortem repositories operational Post-Mortem tools to view data and perform analysis operational

HC Review F. Rodriguez-Mateos Power Converters connected to Magnets Power Converters connected to Magnets Power Converters not connected to Magnets Power Converters not connected to Magnets connexion of power cables to the power converters IST:WELQA- Electrical Quality Assurance warm magnet circuits HCA:WPCTL HCA:WPC1 HCA:WPC2 and HCA:POL Powering of the electrical circuits one by one or in groups at low and nominal currents HCA:HR Commissioning of all the warm electrical circuits of the machine Point powered in unison to nominal current during 24h HCA:WIC- Individual System Tests of Powering Interlock Control HCA:WST System tests from the CCC

HC Review F. Rodriguez-Mateos powering of the warm magnet circuits  HCA:WPCTL  HCA:WPC1  HCA:WPC2 At zero current, verification of the interlock system At minimum current, verification that the PC is connected to the right magnet Setting up of current loop Verification of thermal behaviors (8h heat run) Verification of communications through WorldFip  HCA:POL Verification of the correct current direction and approximate level  HCA:HR (24h run, with exception of the injection circuits) Performed per machine point At nominal current level  HCA:WST System tests performed from the CCC Every circuit has to be powered at least once with a nominal LHC cycle Status after: Warm circuits ready for machine checkout

HC Review F. Rodriguez-Mateos Interlock tests of a powering subsector prior and after connection of the power cables to the DFB leads Power Converters connected to Magnets Power Converters connected to Magnets Power Converters not connected to Magnets Power Converters not connected to Magnets 300 K 1.9 K 90 K Test of power converters connected to the DC cables in short circuit, including controls for powering, ramp, monitoring connexion of power cables to the current leads Electrical Quality Assurance superconducting magnet circuits Individual System Tests of the Quench Protection and Energy Extraction Systems Post-Mortem System tests Commissioning of the electrical circuits one by one or in groups at low, intermediate and nominal currents Commissioning of all the electrical circuits of the sector powered in unison to nominal current with nominal ramp rates Individual System Tests of Powering Interlock Control

HC Review F. Rodriguez-Mateos powering of the superconducting magnet circuits HCA:PIC2Stand-by current to commission the protection functionalities of the powering interlock controllers and all its connected systems with current through the circuits to verify the compatibility of the switch-on and switch-off processes of the converters with the sensitivity of the protection systems (namely QPS) HCA:PLI1 HCA:PLI2 HCA:PLI3 HCA:PLI4 Injection level 20% of I nom 50% of I nom 80% of I nom to set up the power converter current loops to validate the protection mechanisms under real powering conditions and with limited amount of energy in the circuits to validate quench-related procedures, e.g. cryogenic recovery procedures to validate the sensitivity and compatibility during ramps of the systems susceptible to noise pick-up, couplings, etc to perform a last check on the polarities of the circuits by verifying voltages across current leads (at low current using QPS signals) 1/2

HC Review F. Rodriguez-Mateos powering of the superconducting magnet circuits HCA:PNONominal current to verify that the power converters work correctly during the ramp of the current to calibrate the DCCTs for the main power converters and the Inner Triplet power converters and to verify that the calibration systems work correctly to validate the protection mechanisms under real powering conditions and with nominal energy in the circuits to verify the quench current level of each circuit to validate quench-related procedures, e.g. cryogenic recovery procedures HCA:PACNominal current (all circuits of a sector) to verify the tracking of the current to verify thermal performance of the ventilation and water cooling systems in underground areas to have a 24-h reliability run in order to detect premature failures due to wrong settings or possible assembly errors 2/2

HC Review F. Rodriguez-Mateos test programme per circuit class

HC Review F. Rodriguez-Mateos Q4’05Q1’06Q2’06Q3’06Q4’06Q1’07Q2’07 Sector 12 Sector 23 Sector 34 Sector 45 Sector 56 Sector 67 Sector 78 Sector 81 novdecjan feb marapr augmayjunjul sepoctnovdec jan feb marapr mayjunjul oct aug Q3’07 56 days 47 days 56 days 75 days 45 days 55 days expected durations of the powering tests How are these durations calculated?

HC Review F. Rodriguez-Mateos the two methods applied Method 1  The String 2 experience was scaled (time of tests)  Every equipment specialist was consulted and gave an estimate of the time needed to commission a circuit as a function of its type Method 2  Once the HCP on powering was prepared in more detail, the times per step (test) were calculated  No time for analysis was allocated at first

HC Review F. Rodriguez-Mateos method 1: time allocated per circuit Circuit type PCPICQPSTotals Main Dipoles Main and Inner Triplet Quadrupoles Separately Powered Quadrupoles and Dipoles A with and without Energy Extraction A Orbit correctors Units are 15-h days

HC Review F. Rodriguez-Mateos circuits and fronts Front 1Front 2Front 1Front 2 LeftRight 6.6 km Front 1 arc and the matching section on the even side Front 2 arc, the matching section on the odd side and the inner triplets on both sides two shifts = 15 hour days Number of circuits Total per type MB MQ, MQX Separately powered quadrupoles and dipoles 600 A circuits A orbit correctors Total # of days h days per circuit circuit types (60 A orbit correctors in the tunnel not included)

HC Review F. Rodriguez-Mateos the sequence of tests around an even point flexibility wrt the unexpected Specialized teams RB, RQ and RQX never at the same time

HC Review F. Rodriguez-Mateos refined estimate of the times required for the test (1/2) preparationsramp upexecution ramp down/ discharge recoveryanalysis arming systems e.g. fire quench heaters or calibrate DCCT e.g. quench: - cryogenics - energy extraction conditions - quench heater supplies recharged - PM buffers sent - etc… This pattern is repeated for each test at a given current level

HC Review F. Rodriguez-Mateos refined estimate of the times required for the test (2/2) Circuit typeFirst method [days/circuit] Refined method w/o anal. [days/circui t] Time estimated for analysis [days/circuit] Total refined method [days/circuit] # of circuits RB RQ RQX Ind. Powered quads and dipoles A average A, 120 A A Reference for the General Schedule require battery tests

HC Review F. Rodriguez-Mateos tools absolutely required for day 1…  supervisions of the different equipment (PC, PIC, QPS, Cryo, Vac, cooling & ventilation, …)  control applications to drive and monitor the equipment (see Markus’ talk)  Logging, LASER, Post-Mortem  standard tools for manual analysis using data from Post-Mortem (in general, nothing different from individual magnet benches or String 2): view data (y=f(t), engineering units) several curves from different systems on same plot zooming, cursors, etc tools absolutely required to gain time  automated procedures for simultaneous commissioning of multiple circuits the sequencer shown by Markus is an excellent tool for this purpose once validated, they will be very useful to gain time in the case of the commissioning of the corrector circuits safety of equipment does not rely on them (as requested by AB-CO) high energy circuits (RB, RQX, …not many) will be done one by one  tools for automated analysis these tools will be commissioned themselves during the commissioning of the first two sectors still to be agreed upon what information to integrate within this automated analysis (sequence of events, data integrity, time constants, etc)automated analysis

HC Review F. Rodriguez-Mateos how to improve and save time? (1/2)  training as much as possible using LSS L8 tests  being organized and ready from day 1 respecting procedures applying the quality assurance programme obtaining support from the MTF and database team  optimization of the MTF configuration for hardware commissioning  exchange of data between the central database and the specialist owned databases  support from the Controls/Operation Groups programmed procedures for battery tests to be commissioned as soon as possible  dry runs well in advance PM tools ready  reliable analysis is a must  procedures after failure scenarios … to be done

HC Review F. Rodriguez-Mateos how to improve and save time? (2/2) Being protection systems, functionalities of the interfaces of PIC and QPS must always be checked at 100% All bus bar connections (cold and also warm) have to be checked with high current Quenching of magnets is required also to verify the performance of the cryogenic system Risks of skipping some tests there where it pays off: 600 A and 60 A circuits  if one of the 202 energy extraction systems does not operate properly, the impact will be severe  60 A circuits are high inductance, high specific energy Streamlining of tests with experience

HC Review F. Rodriguez-Mateos failure scenarios  discussed at EEWG and HCWG at requests from MARIC and MAC  see Karl Hubert’s talk for most severe cases  some other which are included in a document in preparation are: PC: Fire Cables: Massive water leak S.c. elements:  Bad splice overheating in a sc circuit: detect, open and repair  Bad splice resistance in the normal state (String-2 case) => very difficult diagnostics  Energy extraction failure scenarios  All instrumentation lost for s.c. magnet, lead or circuit  Redundancy lost for the instrumentation of magnet, leads or circuit => recovery procedure  Impossible to power a circuit due to either dead short to ground inside the cold masses or open circuit (?)  list of circuits which are critical for first beam in 2007 (O. Bruening)  reactivity: who, what, when? are defined in advance (within possible)  … anyway, the worst failures will be the ones we did not think about (KHM)  take advantage of Tevatron, HERA, RHIC

HC Review F. Rodriguez-Mateos special tests on the first sector(s) 1/2  Cryogenics AT-ACR would validate the quench recovery and subsequent cooldown procedure and control logic therefore various tests at progressively increasing energy per sector are required, including quenching more than the expected full cell  PIC Reaction times of interlock (especially RB circuit with EE on either side) BIC interface (although commissioned at a later stage) Endurance tests -Post Mortem Interface -Validation of automated procedures in ML8 and XL8 (in parallel with manual commissioning) - Training of personnel  QPS Validation of digital quench detector firmware  Adjustment of digital filters and inductance tables Test of selected heater injection current  General Mains failure EMC tests (AB-CO, AB-PO, AT-MEL)

HC Review F. Rodriguez-Mateos special tests on the first sector(s) 2/2  Also in the first sector Commissioning of automatic test procedures  Preparation of automatic powering procedures and battery tests Interfaces to Post-Mortem Analysis tools … will be used for the first time.

HC Review F. Rodriguez-Mateos Outlook to LSS L8  Unique occasion for the: Validation of powering procedures Early identification of errors, shortcomings and possible corrections Training of the teams  The perfect dress rehearsal

HC Review F. Rodriguez-Mateos A few words on the role of the coordination …

HC Review F. Rodriguez-Mateos  Ensures that the hardware commissioning procedure validates the circuit for nominal operation as defined in the Design Report/LHC Reference Database.  Ensures that all the Individual System Tests related to equipment connected to the circuit have been carried-out, the data has been stored and interpreted by the responsible person  Ensures that each step of the test procedure is carried-out as described in the hardware commissioning procedure document  Ensures that the data associated to each step of the test procedure is recorded and adequately stored in the MTF  Interprets the data and depending on it allows/refuses the execution of the following step of the test procedure  Answers for the data and history of the commissioning of each circuit throughout the IST and the Hardware Commissioning OK Measurements IST OK Measurements IST OK Measurements IST MTF OK Measurements HC Procedure MTF Coordinator for the LHC magnet circuits

HC Review F. Rodriguez-Mateos Coordination for the warm part of the sc circuits  Interfaces:  Power cables – DFB (in particular current leads, but also all the other equipment to be connected  studies and integration)  Power cables – power converters  Power cables – water cooling  Power converters – water cooling  Phases: (Validation of individual systems) Installation and first connection Hardware Commissioning Operation & Maintenance  Groups involved: AB-PO, AT-MEL, AT-ACR, TS-CV, TS-EL, TS-HDO, TS- IC, SC-GS

HC Review F. Rodriguez-Mateos Goals for the Coordination for the warm part of the sc circuits  Clarify interfaces  Coordinate the definition of sequences and the write-up of procedures Assessment on the feasibility  Define responsibilities over the different phases …with special attention to: Planning Co-activities Safety

HC Review F. Rodriguez-Mateos Thanks

HC Review F. Rodriguez-Mateos powering profiles time 1 time step 1 step 2 time 2 nominal I current   First power One of the subsequent power runs This was the procedure applied to String-2 circuits With the implementation of adapted quench detection thresholds (1/10 for the plateaux, see Reiner’s talk) this procedure will relax the specification for the control application

HC Review F. Rodriguez-Mateos power tests foreseen for MB circuits currenttestsverifications 760 ASet up current loopcurrent loop parameters 760 AFast PA from PICpartial protection chain 760 ASlow PA from PICpartial protection chain 760 AOpen EE switches with global (or bus bar) QD tripfull protection chain 760 AFire quench heaters in two dipoles (two tests)full protection chain, partial energy dissipation 2000 ACheck current loop stabilitycurrent loop parameters 2000 ASlow PA from PICpartial protection chain 2000 AOpen EE switches from PICEE parameters OK; magnets don’t quench 2000 AFire quench heaters in at least one magnetfull protection chain, partial energy dissipation 6000 ACheck current loop stabilitycurrent loop parameters 6000 AFast power abort from PICEE parameters OK; magnets don’t quench 6000 AFire quench heaters in one magnetfull protection chain, partial energy dissipation 9500 AFast power abort from PICEE parameters OK; magnets don’t quench ACheck current loop stabilityup, down, powering failure in PC ADCCT calibrationscalibrations for beam operation AFast power abort from PICEE parameters OK; magnets don’t quench AFire quench heaters in one magnetfull protection chain, full energy dissipation

HC Review F. Rodriguez-Mateos Analysis of provoked events  right equipment  number of data blocks and their integrity  sequence of actions (PIC, PC, QPS, cryo?)  QD: fixed pattern for QS during provoked quenches threshold verification  EE: voltage across dump resistor  Flags: QD  Coherency flag, QD0, ST_Magnet_OK EE  to be defined in detail  PC: decay time constant  signals from quench heater power supplies: U levels time constant