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Powering from short circuit tests up to nominal

Powering from short circuit tests up to nominal. Antonio Vergara for the HCC Team 28 th March, 2007. General Overview. What we want to do ? Power ALL the superconducting circuits of the LHC up to their nominal operation current (7 TeV) without beam. When are we going to do it ?

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Powering from short circuit tests up to nominal

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  1. Powering from short circuit tests up to nominal Antonio Vergara for the HCC Team 28th March, 2007

  2. General Overview • What we want to do? Power ALL the superconducting circuits of the LHC up to their nominal operation current (7 TeV) without beam. • When are we going to do it? FROM MONDAY. See Blanca’s slides • Where are we going to do it? In the tunnel (Field Control Room) and on the surface (CCC) • Who is going to do it? The Commissioning Crew. See Roberto’s slides • How are we going to do it? Well, safely and fast. See Robin’s, Paul’s and Antonio’s slides

  3. General Overview • So far we have learnt about • Superconducting electrical circuits • Power converters • Superconducting magnets, busbars and current leads • Powering interlock system • Quench protection system • Cooling and ventilation, AC distribution, cabling • Cryogenics • The Powering Tests will make these systems work together for the first time. • But before that…

  4. The Way to the Powering Tests • Individual System Tests (IST) • The Short-Circuit Tests

  5. The Short-Circuit Tests

  6. The Way to the Powering Tests START OF COOL-DOWN CRYOGENIC CONDITIONS • Individual System Tests (IST) • The Short-Circuit Tests 3. Powering Procedure Tests 4. PIC1 - Correctors 5. Electrical Quality Assurance @ Cold 6. Quench Heater Discharge 7. PIC1 – Main Magnets 8. Connection of the converters to the CL

  7. During Cool-Down…

  8. And at last… THE POWERING TESTS CONVERTERS CONNECTED TO THE MAGNETS 3. PIC2 4. Powering to Nominal of every circuit (P2N) 5. 24-hour run with all the circuits at nominal

  9. Powering Interlock Tests – PIC1 & PIC2 - FAQ • What do PIC1 and PIC2 validate? • The correct functioning of the powering interlock system and associated systems and • The interfaces between the Powering Interlock Controllers and the QPS, Energy Extraction and Power Converters • Which is the difference between PIC1 and PIC2? • For PIC1 the converters are NOT CONNECTED to the superconducting magnets while for PIC2 the converters are CONNECTED to the superconducting magnets. PIC2 is therefore the first test with current in the magnets • Why is PIC1 for the correctors done without the Stable Cryogenics Conditions? • PIC1 for the correctors has no interference in the superconducting part of the circuit, on the other hand PIC1 for the main circuits implies discharge of the quench heaters which can only be done under stable cryogenic conditions. • Do we need to complete PIC1 in the whole powering subsector for starting PIC2? • YES • Do we need to complete PIC2 in the whole powering subsector for starting P2N? • NO, but preferable

  10. Types of electrical circuits with sc magnets • 13 kA Main: Main dipoles and main quadrupoles (24 circuits) • IT: Inner triplet quadrupoles (8 circuits) • IPQD: Individual powered insertion main magnets (94 circuits) Extraction of the energy stored in the magnets is performed by the QPS system • 600 A EE: most 600 A corrector magnets powered in series (202 circuits) Extraction of the energy stored in the magnets is performed with an energy extraction unit back to back to the power converter rack • 600 A no EE crowbar:most individual 600 A trim quadrupoles (136 circuits) Extraction of the energy stored in the magnets is performed with the power converter • 600 A no EE:inner triplet correctors (56 circuits) No energy extraction unit required • 80-120A: 80 A and 120 A (300 circuits) No energy extraction unit required, connected to the Powering Interlock Controller R.Schmidt • 60A: 60 A (752 circuits) No energy extraction unit required, not connected to the Powering Interlock Controller

  11. The Main Dipole Circuit Powering PM Analysis Results PM data PM Analysis Results PM data PM data PM Analysis Results PM data Quench PM Analysis Results EE Loss PP PM data Quench FPA SPA EE PIC2 RB Circuit 12 kA 8.5 kA 6 kA 2 kA Injection 760A 350A

  12. Sequence of Powering Tests Intermediate 1 Injection Intermediate 2 Intermediate 3 Nominal

  13. Circuit Inventory Sector 7-8 XL8 60A 120A 120A Q4Q5D2 RB 47 1 3 12 14 22 2 5 94 DESIGN Q6-Q10 600A RQ ARC 7-8 ML8 200 47 1 3 12 0 22 2 5 94 186 TRIPLET 47 1 3 12 0 22 2 5 94 186 MB1055 Max 2kA 23 1 3 12 0 20 2 5 94 160 MB1055 160 Circuits fully Commissioned Status after the Powering Tests 3 Main Circuits (RB, RQF, RQD) to be re-commissioned 1 Inner Triplet and 26 arc correctors never powered

  14. The Two Fronts FRONT 1 FRONT 2 E.Barbero / Mr Circuit

  15. Parallelism or what can be done at the same time? • The 3 types of parallelisms: • Parallelisms between sectors • Parallelisms between fronts • Parallelisms between circuits – Battery • General Constraints: • One Front can commission only one circuit or one battery at a time • Tests carried out by one Front should be transparent to the other ones

  16. Constraints on Parallel Commissioning • Two sectors cannot test simultaneously • Two or more 13kA circuits • Two fronts cannot test simultaneously • Circuits in the same powering subsector when one main circuit is involved.

  17. The Two Fronts – Arc 7-8 Afternoon Shift Morning Shift Morning & Afternoon

  18. Constraints on Parallel Commissioning • Two sectors cannot test simultaneously • Two or more 13kA circuits • Two fronts cannot test simultaneously • Circuits in the same powering subsector when one essential circuit is involved. • A battery cannot • Include circuits above 600A • Imply more than one DFB • Imply more than two DFB chimneys • Include circuits sharing the same QPS controller • Include circuits from different circuit type • Include circuits from different powering subsectors

  19. Schedule CRYO-OK 1.9K WEEK 13 WEEK 15 WEEK 14 WEEK 16 CRYO-OK 4.5K ML8 60A ARC 7-8 Today Preparation Preparation PIC2 P2N P2N PIC2 FRONT 1 2 Shifts FRONT 2 2 Shifts

  20. Sector 7-8 – Total TOTAL TIME SECTOR 7-8: 10 WEEKS (from CRYO_START)

  21. Glossary • Powering Tests • Short-Circuit Tests • Field Control Room • Individual System Tests (IST) • Powering Procedure Tests • PIC1 • PIC2 • Circuit type • Sequence • Fronts • Parallelism • Battery of circuits • Sector • Powering Subsector • QPS Controller • DFB Chimeny • Morning and afternoon shifts • Post-Mortem (PM) Analysis • Injection Current • Intermediate Current • I_MIN_OP Current • Nominal current

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