AT-MEI Group, CERN, 1211 Geneva 23 MPP 18-6-2008 1 Unbalance between apertures of MB B30R7 MPP meeting 18/06/2008 Unbalance between apertures of Dipole.

Slides:

Advertisements

Similar presentations

MPP 18 June 2008, M. Bednarek & J. Ludwin, CERN 1 Measurements of voltage over main dipole magnet B30R7 Mateusz Bednarek & Jaromir Ludwin on behalf of.

Advertisements

6 th April 2010 MP3 weekly summary – issues and follow-up 0v1 M. Zerlauth for the MP3-CCC shift crew.

MP3 report – week 17 19/4/2010 – 25/04/ interventions MP3/QPS team in CCC Monday Morning Meeting : 26th of April 2010.

DR km DTC Lattice 7 July 2011 D. Rubin. DTC01 layout 1.Circumference = m, 712m straights 2.~ 6 phase trombone cells 3.54 – 1.92m long wigglers.

MQXF state of work and analysis of HQ experimental current decays with the QLASA model used for MQXF Vittorio Marinozzi 10/28/

1 / 19 M. Gateau CERN – Geneva – CH 14th International Magnetic Measurement Workshop September 2005, Geneva, Switzerland.

CRYOGENICS AND POWERING

HQ02b : Test plan overview Test plan overview: Main elements and Open questions H. Bajas TE-MSC-TF H. BAJASUpdate meeting on HQ02b assembly and test plan02/05/2014.

Noise studies: hardware tests and preliminary results Anna, Anton, Giovanni, Pigi, Silvia, A. Boiano, A. Vanzanella.

Field Quality Working Group-14/12/04 - Stephane Sanfilippo AT-MTM-AS Field Quality measurements at cold. Standard program v.s extended tests. Presented.

MP3 report : W49 (6 slides, 6’) J.Ph Tock for the MP3 team Since oral report last week (24 th of November) 1JPhT – LMC 1st of December 2010.

How to achieve higher redundancy of the UPS for QPS ? -The lack of redundancy concerns the supply lines from UPS to consumer but equally parts of the UPS.

A. Verweij, TE-MPE. 3 Feb 2009, LHC Performance Workshop – Chamonix 2009 Arjan Verweij TE-MPE - joint stability - what was wrong with the ‘old’ bus-bar.

TE-MPE Workshop 14/12/2010, Manuel Dominguez, TE/MPE-EI 1 Stephen Pemberton, TE/MPE-EI RB Earth Spark Investigation Initial Report. S. Pemberton, G. D’Angelo.

The diode lead resistance ‘issue’ A. Verweij, TE-MPE, CSCM workshop 7/10/2011 Contents:  Diode geometry  Measurements performed in the past  Measurements.

Frequency Transfer Function Measurements during LS1 Emmanuele Ravaioli Thanks to Arjan Verweij, Zinur Charifoulline, Andrea Musso MPE-TM

Proposal for FTF measurements on dipole magnets in the tunnel during the Christmas break Emmanuele Ravaioli TE-MPE-TM

Mariusz Sapinski BI/BL Acknowledgements: 1 Planning of quench tests - LMC158 Draft planning of beam induced quench tests at the end of 2013 run LHC Machine.

AT-MEL-PM, R. Denz, CERN, CH-1211 Geneva 23 1 QPS system and its risks  Principal risks  General remarks  Quench heater circuits  Quench detection.

AT-MEL, CERN, 1211 Geneva 23 R.Wolf-LHCCWG Magnet Setup Cycling for LHC R. Wolf for the FQWG et al. Contents -Overview -Details of individual cycles.

F. Savary Question 1 A. Magnet design criteria for the prototype and production magnet to be tested before the installation into the tunnel.

Measurement and data extraction. How to measure the splice and diode interconnections. Accuracy and issues of these measurements. Data extraction issues.

Modelling and testing of circuit protection of new superconducting magnets for the HL-LHC project 1 st Workshop FTEC 2015 Alejandro Fernandez Navarro.

HIGH RAMP RATE SUPERCONDUCTING MAGNETS AT BNL Peter Wanderer BNL Archamps Workshop, March 2003.

Cold test of SIS-300 dipole model Sergey Kozub Institute for High Energy Physics (IHEP), Protvino, Moscow region, Russia.

AT/MTM, August 2004 Quench Test Results obtained with The Local Quench Antennas on selected magnets M. Calvi S. Kouzue A. Forrester E. Floch P. Pugnat.

Power Converters and DC cablesSlide 1/.. LHC - HC review Hugues THIESEN – AB/PO Thursday, 12 May 2005 Water cooled cables warm bus bars power converter.

Cold powering test results of MBHSP102 Gerard Willering, TE-MSC-TF With thanks to Jerome and Vincent and all others from TF for their contribution.

MP3 List of main Issues during March 2010 MP3 - Team.

Faster ramp rates in main LHC magnets Attilio Milanese 7 Oct Thanks to M. Bajko, L. Bottura, P. Fessia, M. Modena, E. Todesco, D. Tommasini, A. Verweij,

Advanced simulations of events in the RB circuit Short circuit to ground Quench of a dipole provoked by the quench heaters Emmanuele Ravaioli Thanks to.

E. Todesco MAGNET (RE)Training E. Todesco Magnets, Superconductors and Cryostats Group Technology Department, CERN LHC risk review, 5 th March 2009 Acknowledgements:

HWC with nQPS Splice Monitoring Zinur Charifoulline & Bob Flora Real Time (~10 sec) BUS Voltage Energy Extraction Trip 300 µV threshold on Un-bypassed.

QPS Signal Analysis Case studies from MPP and QPS Bob Flora.

Machine Protection Review, R. Denz, 11-APR Introduction to Magnet Powering and Protection R. Denz, AT-MEL-PM.

E. Todesco ENERGY OF THE LHC AFTER LONG SHUTDOWN 1 ( ) C. Lorin, E. Todesco and M. Bajko CERN, Geneva Switzerland With relevant inputs from colleagues.

Main dipole circuit simulations Behavior and performance analysis PSpice models Simulation results Comparison with QPS data Ongoing activities Emmanuele.

LHC circuit modeling Goal: Create a library of electrical models and results for each circuit Useful and usable for the next 20 years…… Web site cern.ch/LHC-CM.

Protection of 600 A bus bars, follow up W. Venturini Delsolaro and A. Verweij MPP meeting, 17/10/2006.

Ramping faster? Mike Lamont Ralph Steinhagen. I’(t) = 0 to avoid a voltage discontinuity “it has been shown that if I’(t) is kept low at the end of the.

Powering the damping rings wigglers Daniel Siemaszko, Serge Pittet OUTLINE : Powering superconductive magnets, Powering wigglers strategy, Existing.

Study of the HTS Insert Quench Protection M. Sorbi and A. Stenvall 1 HFM-EuCARD, ESAC meeting, WP 7.4.1CEA Saclay 28 feb. 2013,

Measurement of LHC Superconducting Dipole and Quadrupole Magnets in Ramp Rate Conditions G.Deferne, CERN Aknowledgements: M. Di Castro, S. Sanfilippo,

TQC03e Test Status  Magnetic measurements at 300 K  Z-scan at ±10 A  Magnetic measurements at 4.6 K (I max up to 6.5 kA)  Quench training and ramp.

SC Undulators protection and commissioning W. Venturini Delsolaro Acknowledgements: R. Denz, R. Maccaferri.

Sextupole Single Coil Test Results Giovanni Volpini on behalf of the LASA Team Giovanni Volpini, CERN, 22 April 2015.

Logo area HL LHC IT STRING M. Bajko CERN TE-TM and QXF Review.

Quench behavior of the main dipole magnets in the LHC By Gerard Willering, TE-MSC On behalf of the MP3-CCC team Acknowledgements TE-MSC, MP3, BE-OP, TE-MPE,

Cold powering test results of the 11 T cosθ model magnets at CERN Gerard Willering With thanks to Jerome Feuvrier, Vincent Desbiolles, Hugo Bajas, Marta.

17 th April 2007 Nicholas J. Sammut Decay Prediction and Minimisation During LHC Operation University of Malta Field Quality Working Group with several.

D1 and D2 powering and protection

11T Magnet Test Plan Guram Chlachidze

Frequency Transfer Function of a dipole What is it Why is it important How to calculate it How to model it How to measure it Emmanuele Ravaioli LHC-CM.

Status of RB circuit modeling PSpice models Simulation results: nQPS & oQPS Comparison with QPS data Ongoing activities Emmanuele Ravaioli TE-MPE-TM

Quench protection of the MAGIX high-order correctors

Powering the LHC Magnets

Detailed global view on protection and detection of the circuits

Rüdiger Schmidt and Karl Hubert Mess

Cycle-to-cycle reproducibility and magnet modeling.

Detection thresholds in LARP Magnets

Cooling aspects for Nb3Sn Inner Triplet quadrupoles and D1

Flux jumps in HQ Hugo BAJAS

H. BAJAS | June 2014, CERN.

Hilumi WP3 meeting, 1 October 2014

MQXFAP2 SG Readings ---Update (up to quench #22)

J. García, F. Toral (CIEMAT) P. Fessia (CERN)

Simulating Quench Signals in the LHC Superconducting Dipoles

Long term behavior and high-QI test in the MQXFS program

MBHSP109 Test results 11T technical meeting – EDMS number:

Electrical measurements and diagnostics

Presentation transcript:

AT-MEI Group, CERN, 1211 Geneva 23 MPP Unbalance between apertures of MB B30R7 MPP meeting 18/06/2008 Unbalance between apertures of Dipole B30R7 in S78 (MB 1007) R. Wolf

AT-MEI Group, CERN, 1211 Geneva 23 MPP Obervations  Quench detected in MB B30 (MB 1007) during fast discharge at 7000A => dI/dt =-70A/s  Reason. There is no real quench. There is a voltage diiference between the two apertures which grows with dI/dt and exceeded 100mV. Maybe a short?  Detailed measurements made with oscilloscopes in the tunnel showed however that there was no unbalance between upper and lower poles. Short therefore unlikely, except if symmetric around the midplane(decided to make interturn test in tunnel to make sure)  Magnetic measurement in SM18 during ramp had also shown a different dynamic behaviour of the aperture with a unusually high sextupole in one aperture. Also no particular asymmetry between upper and lower poles.  The behaviour in the machine seems therefore identical to the behaviour in SM18, where this magnet was trained to 12KA as usual.

AT-MEI Group, CERN, 1211 Geneva 23 MPP Magnetic Measurement during Ramp  EDMS No: HCLBBR_000-CR001007, Magnetic Measurement Test Report, S. Sanfilippo, L. Bottura, V. Granata, R.K. Mishra / LHC-MTA

AT-MEI Group, CERN, 1211 Geneva 23 MPP Conclusion  Based on the similar behaviour in SM18 and the tunnel and the unlikelyhood of a short it would seem reasonable to continue training (if interturn test OK), with higher threshold at 200mV.  The origin of the phenomenon is not clear (Cable Rc?, external loop?). Further study to understand the origin of these large unbalances and to predict them seems useful.  Could the QPS system measure the unbalance before we start the training?