New HV test specification for the LHC
description
Transcript of New HV test specification for the LHC
![Page 1: New HV test specification for the LHC](https://reader034.fdocuments.us/reader034/viewer/2022051020/56816172550346895dd0fc60/html5/thumbnails/1.jpg)
New HV test specification for the LHC
N. Catalan for the EI section
![Page 2: New HV test specification for the LHC](https://reader034.fdocuments.us/reader034/viewer/2022051020/56816172550346895dd0fc60/html5/thumbnails/2.jpg)
The current specification
• EDMS 90327 from 2004 (LHC-PM-ES-0001 rev. 2.0)
• Refers to equipment tests from manufacturing to installation in LHC– Operation conditions
define the lower voltage– Apply decreasing voltages
through manufacturing • Only single circuits vs.
ground are considered
![Page 3: New HV test specification for the LHC](https://reader034.fdocuments.us/reader034/viewer/2022051020/56816172550346895dd0fc60/html5/thumbnails/3.jpg)
The voltage to ground for each circuit
• Two different sources of voltage during operation– Energy extraction at
maximum current U=RI– Quench voltage from
simulations• Either/or for all
circuits but for dipoles• Safety factor 1.2
applied– Except for dipole circuit
• Missing RCO2xV+500Imax x REE 1.2xV
![Page 4: New HV test specification for the LHC](https://reader034.fdocuments.us/reader034/viewer/2022051020/56816172550346895dd0fc60/html5/thumbnails/4.jpg)
From ElQA EDMS 788197 (2008)
Test Voltage Test Test Voltage Test Test Voltage Test
voltage ramp duration voltage ramp duration voltage ramp duration
rate rate rate
[V] [V/s] [s] [V] [V/s] [s] [V] [V/s] [s]
Main Dipoles (MB) 600 2 300 600 2 300 1900 2 300Main Quadrupoles (MQ) 120 5 300 120 5 300 240 5 300Spoolpieces (MCS, MCD)Arc correctors (MSCB,MO) 300 10 180 300 10 180 600 10 180Trim Quads (MQT, MQTL, MQS)Matching MQM (1.9K)Matching MQM (4.5K)Matching MQY 60 10 180 60 10 180 120 10 180LowBeta Quads 210 5 300 210 5 300 420 5 300Separator magnets 300 10 180 300 10 180 600 10 180
TP4-B TP4-D TP4-E
CIRCUIT type
240
180
240
240
480
360
480
240
180
240
480240
10 300
10 180
10 180
10 180
10 300
10 180
10
10 300
10 180
10 180180
10 180 10 180
![Page 5: New HV test specification for the LHC](https://reader034.fdocuments.us/reader034/viewer/2022051020/56816172550346895dd0fc60/html5/thumbnails/5.jpg)
Insulation tests during TP4-e tests • Different classification
from EDMS 90327• Different tests for air
cooled leads1. each circuit tested at a
lower voltage one by one versus all other circuits and ground.
2. all circuits of one chimney are tested together at higher voltage level vs ground.
![Page 6: New HV test specification for the LHC](https://reader034.fdocuments.us/reader034/viewer/2022051020/56816172550346895dd0fc60/html5/thumbnails/6.jpg)
RQ vs Spools• M1/M2 lines and M lines run along
together• General protection will run down all of
them at the same time
![Page 7: New HV test specification for the LHC](https://reader034.fdocuments.us/reader034/viewer/2022051020/56816172550346895dd0fc60/html5/thumbnails/7.jpg)
Line N circuits
• Bus-bar run together along the same cryogenic line
• Metallic braids already gave insulation problems
• MQT, MQTL, MQS, MSCB with energy extraction
• MO, MQM with no EE
Monday Morning Meeting : 3rd of May 2010
![Page 8: New HV test specification for the LHC](https://reader034.fdocuments.us/reader034/viewer/2022051020/56816172550346895dd0fc60/html5/thumbnails/8.jpg)
A. Perin AT-ACR, 8
Spool busbar routing inside DFBAs
Busbars in lines M1 & M2 Busbars
merged with line N
All 600 A busbars in the same duct
CorrectorsSpoolBundles of n x 4 busbars
![Page 9: New HV test specification for the LHC](https://reader034.fdocuments.us/reader034/viewer/2022051020/56816172550346895dd0fc60/html5/thumbnails/9.jpg)
New voltage to ground values• Which electrical circuits
have bus-bars running in the same cryo-line?
• Only circuits whose voltage is coming from EE should be taken into account.
• Nested circuits• Maximum operation
voltage x1.2
![Page 10: New HV test specification for the LHC](https://reader034.fdocuments.us/reader034/viewer/2022051020/56816172550346895dd0fc60/html5/thumbnails/10.jpg)
• Maximum operational voltage against any neighboring circuit
• Tested circuit vs. all others + ground
Voltage level proposal
![Page 11: New HV test specification for the LHC](https://reader034.fdocuments.us/reader034/viewer/2022051020/56816172550346895dd0fc60/html5/thumbnails/11.jpg)
• HV tests with new voltages need to be implemented prior to cool-down in 2011/2012
• RCO/RCB Lemo connector insulation weakness– Will be inspected in the next technical stop– Repair during the Xmas break?
• Tests of the two bus-bars of RQ?– Implemented during the assembly in the long
shutdown in 2012– Is it possible to interrupt the circuit?
Practical considerations
![Page 12: New HV test specification for the LHC](https://reader034.fdocuments.us/reader034/viewer/2022051020/56816172550346895dd0fc60/html5/thumbnails/12.jpg)
• Magnet instrumentation check– Local measurement at warm and cold– Continuity and resistance of diagnostic
Vtaps– Resistance and insulation of QH– QH against coil & ground
• ElQA test procedure needs to be updated– Can be done at the same time as HV
qualification for the magnet
MIC tests introduced during 2009
![Page 13: New HV test specification for the LHC](https://reader034.fdocuments.us/reader034/viewer/2022051020/56816172550346895dd0fc60/html5/thumbnails/13.jpg)
Quench heaters vs. ground
• Not specified in the note
• Minimum 2x450+500 = 1400 for most circuits
• Voltage on the coil during quench added to this value
• Not taken into account in US magnets during manufacturing
• Needs to be reviewed
![Page 14: New HV test specification for the LHC](https://reader034.fdocuments.us/reader034/viewer/2022051020/56816172550346895dd0fc60/html5/thumbnails/14.jpg)
Where is it coming from?
![Page 15: New HV test specification for the LHC](https://reader034.fdocuments.us/reader034/viewer/2022051020/56816172550346895dd0fc60/html5/thumbnails/15.jpg)
• Tests in SM18 at cold • Reception tests in b181(at warm) for US
magnets• Minimum voltage retained• QH/coil vs. ground values?
MIC proposed HV values
![Page 16: New HV test specification for the LHC](https://reader034.fdocuments.us/reader034/viewer/2022051020/56816172550346895dd0fc60/html5/thumbnails/16.jpg)
• ElQA test procedure 788197 to be rewritten and reissued
• Higher values to be applied almost in all correctors RQ(M) and RQ circuits
• MIC test to be added• Hardware modifications in DFB
chimneys to remove limitations to be implemented– During Xmas stop– During long shutdown
Conclusions
![Page 17: New HV test specification for the LHC](https://reader034.fdocuments.us/reader034/viewer/2022051020/56816172550346895dd0fc60/html5/thumbnails/17.jpg)
• Machine will be emptied • Three days cooling tower cleaning
will stop active cooling on DFBs• All DFBs SAM and SC links will warm
up above 120K• According to A. Perin that will mean
a full thermal cycle• What parts of ElQA need to be
redone?
Xmas break ElQA tests
![Page 18: New HV test specification for the LHC](https://reader034.fdocuments.us/reader034/viewer/2022051020/56816172550346895dd0fc60/html5/thumbnails/18.jpg)
From ElQA test procedure
![Page 19: New HV test specification for the LHC](https://reader034.fdocuments.us/reader034/viewer/2022051020/56816172550346895dd0fc60/html5/thumbnails/19.jpg)
ElQA • Only TP4e tests HV in the arc– One week per sector for a team of 2-3
people– Enough resources in house with the
eventual help of other sections– Two sectors in parallel.– To be fitted in the schedule
• Full TP4e and MIC in the SMA magnets