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AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
1
What are today's issues for all other magnets?
Questions
1.) What are the as build performances of the other magnets vs. ones expected from the design?
2.) Any impact on the expected safe machine collision energy for commissioning?
3.) What is the repair/replacement strategy in case of a damage to a magnet? What are the delays?
4.) How many spares are foreseen?
5.) What can be expected from central workshop in case of problems? How long will it take?
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
2
What are “all other magnets” ?
Warm magnets
– 19 types, 845 items installed
Cold Dispersion Suppressor Magnets
– 5 types, made by combining 7 different types of magnets, 64 sets installed
Cold Matching Section
– 9 types, made by combining 7 different types of magnets, 50 sets installed
Cold Separation Dipoles
– 4 types, 20 installed (4 spares)
Inner Triplet Magnets
– 3 types, made using 12 different magnets, 8*3 sets installed (1 spare each)
Cold Correctors
– 26 types*), 4662 sets installed
In total 5669 magnets coming in 66 types (11h talk?)
– *) depends on the way of counting
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
3
Warm Magnets in the LHC and the transfer lines
Separation dipole /
3.4m
Separation dipole /
1.5m
Separation dipole / 0.75m
Separation dipole /
3.4m
Corrector / 1.7m
Corrector / 1.7m
Quadrupole / 3.1m
type MBXW MBXWT MBXWS MBW MCBWH MCBWV MQW
location IR1,5,8 IR2 IR8 IR3,7 IR3,7 IR3,7 IR3,7
total 29 3 3 24 10 10 52
for installation
25 2 2 20 8 8 48
spares 4 1 1 4 2 2 4
sets of spare coils
1 1 1 1 1.51
Dipole / 5.3m
Dipole / 6.7m
Dipole/ 3.4m
Dipole/ 2.8m
Quadrupole/ 2.99m
Quadrupole / 1.6m
Corrector / 0.45m
type MBHC MBI MBIA MBIB QTL MQI MCIAlocation TT40 TI2+8 TI2&8 TI2&8 TI2+8 TI2+8
total 4 360 59 11 1 185 105for
installation3 348 56 11 1 178 95
spares 1 12 3 0 depends 7 10sets of
spare coils0 2 4
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
4
Septa and Total Sum of Warm Magnets
Injection Septum
magnets / 3.65m-4m
Injection Septum
magnets / 3.65m-4m
Beam Dumping Septum
magnets / 4m-4,46m
Beam Dumping Septum
magnets / 4m-4,46m
Beam Dumping Septum
magnets / 4m-4,46m
in total
type MSIA MSIB MSDA MSDB MSDC
location TI2+8 TI2+8 IR6 IR6 IR6
total 5 7 11 11 11 901for
installation4 6 10 10 10 845
spares 1 1 1 1 1 56sets of spare
coils1 1 1 1 2
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
5
Performance and Fault Scenarios
1) 'As built' performance of all magnets is higher or equal to the one expected from the design. MBXWT will require a higher water flow-rate (6l/min instead of 4l/min) to reach the requested ultimate performance.
2) No impact on energy during commissioning.
3) Repair in situ for small damages / faults in short interventions. Replacement of magnet in all other cases.
4) Number of spares barely sufficient.
5) Magnet workshop exists, Main workshop delivers bits and pieces.
Anticipated Faults:
– Leakage due to Corrosion, Erosion, Mechanical forces on connectors
– Blocking of cooling circuit - Thermo-switch fault
– Insulation damage due to radiation, heat, forces
– Beam damage - Transport accident
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
6
Caveat (1)
Delays for exchange and repair will probably depend rather on radiation cool-down times. Cool-down times depend on the length of intervention. For a MQW exchange >1week
The minimum replacement time depends on the time needed to bring the transport vehicles in the right places and to prepare them for the specific magnet type. At least one day, better two should be foreseen for this operation.
Magnet transport will be hindered by shielding blocks that will have to be removed. In particular in IR7, it is unclear to me, how and how far they are to be transported, what the impact of this operation is and at what moment of cool-down it can take place.
Repairs of the magnet connections can be executed after cool-down of the magnet. Exchange of coils requires opening of the magnet with particular tools. We have so far recuperated tools from the manufacturers or requested to keep them in a good shape for us and we will do so in future.
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
7
Caveat (2)
Handling equipment for Russian magnets is not CE certified and will therefore not be readily accepted by SC. Currently no workunits for the repair, adaptation or replacement-acquisition of such equipment is forseen. It will require considerable time and effort to do such repairs. However, the time needed should be guaranteed by a sufficient number of spares.
MQW in particular is a structurally sensitive magnet that requires a particular procedure with sufficient space and time. As far as possible, the detailed production procedures were collected and filed. However like in football, it needs time to replace a trained team that achieved the tasks on a series of 52 magnets. (E.g. we know that the multipole parameters over the series follows a clear trend.)
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
8
Optimistic Magnet Exchange Schedule
Magnet Exchange
0
0.5
1
1.5
2
2.5
3
Ventil
atio
n inte
rven
tion
Acces
s with
Bugg
y Tr
ain
Acces
s with
Hyd
raulic
Aggre
gate
Apply
elec
trica
l sec
urity
mea
sure
s
Disco
nnect C
urre
nt
Mount
pro
tect
ion c
over
s
Lift M
agnet
Loadin
g
Transv
ersa
l Move
men
t
Transp
ort t
o Acc
ess
Point
Unload
ing
of dam
aged
mag
net
Closi
ng o
f shie
ldin
g in IP
6
Transp
ort f
rom
Acc
ess
Point
Unsecu
ring
Exit b
uggie
s
Exit w
ith B
uggy
Tra
in
Remove
Aux
iliar
y Jac
ks
Connec
t Wat
er
Connec
t Inte
rlock
s
Mount
pro
tect
ion c
over
Pre-A
lignm
ent
Ventil
atio
n inte
rven
tion
Work
Ma
n H
ou
rsIn total 22 man hours, in about 7hours.
Preparation, Vacuum and Alignment not counted
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
9
Optimistic Magnet Exchange Schedule
Magnet Exchange
0
0.5
1
1.5
2
2.5
3
Ventil
atio
n inte
rven
tion
Acces
s with
Bugg
y Tr
ain
Acces
s with
Hyd
raulic
Aggre
gate
Apply
elec
trica
l sec
urity
mea
sure
s
Disco
nnect C
urre
nt
Mount
pro
tect
ion c
over
s
Lift M
agnet
Loadin
g
Transv
ersa
l Move
men
t
Transp
ort t
o Acc
ess
Point
Unload
ing
of dam
aged
mag
net
Closi
ng o
f shie
ldin
g in IP
6
Transp
ort f
rom
Acc
ess
Point
Unsecu
ring
Exit b
uggie
s
Exit w
ith B
uggy
Tra
in
Remove
Aux
iliar
y Jac
ks
Connec
t Wat
er
Connec
t Inte
rlock
s
Mount
pro
tect
ion c
over
Pre-A
lignm
ent
Ventil
atio
n inte
rven
tion
Work
Ma
n H
ou
rsIn total 22 man hours, in about 7hours.
Preparation, Vacuum and Alignment not counted
17 man hours work for MEL
The section has only 12+1 staff and 10 industrial support for all accelerators
The LHC subsection (knowledge of the MQW) has 3 staff +1 industrial support
The radiation dose/magnet exchange is estimated to ~19 mSv, thereof ~12 mSv for MEL.
To stay below 2mSv/man/intervention => 6 people needed to exchange 1 magnet/month and 5/year.
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
10
Optimistic Magnet Exchange Schedule
Magnet Exchange
0
0.5
1
1.5
2
2.5
3
Ventil
atio
n inte
rven
tion
Acces
s with
Bugg
y Tr
ain
Acces
s with
Hyd
raulic
Aggre
gate
Apply
elec
trica
l sec
urity
mea
sure
s
Disco
nnect C
urre
nt
Mount
pro
tect
ion c
over
s
Lift M
agnet
Loadin
g
Transv
ersa
l Move
men
t
Transp
ort t
o Acc
ess
Point
Unload
ing
of dam
aged
mag
net
Closi
ng o
f shie
ldin
g in IP
6
Transp
ort f
rom
Acc
ess
Point
Unsecu
ring
Exit b
uggie
s
Exit w
ith B
uggy
Tra
in
Remove
Aux
iliar
y Jac
ks
Connec
t Wat
er
Connec
t Inte
rlock
s
Mount
pro
tect
ion c
over
Pre-A
lignm
ent
Ventil
atio
n inte
rven
tion
Work
Ma
n H
ou
rsIn total 22 man hours, in about 7hours.
Preparation, Vacuum and Alignment not counted
17 man hours work for MEL
The section has only 12+1 staff and 10 industrial support for all accelerators
The LHC subsection (knowledge of the MWQ) has 3 staff +1 industrial support
The radiation dose/magnet exchange is estimated to ~19 mSv, thereof ~12 mSv for MEL.
To stay below 2mSv/man/intervention => 6 people needed to exchange 1 magnet/month and 5/year.
MEL would be unable to exchange a MQW under the present conditions
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
11
Quench Behaviour of MQM and MQY Magnetsin the Matching Section and Dispersion Supressor
MQ
MC
01
MQ
M_0
2
MQ
M_0
7
MQ
MC
08
MQ
MC
09
MQ
M_1
5 S1
S4
S7
01000200030004000500060007000
Current
Magnet
Quench
AP
1M
QY
_0
1
AP
2
AP
1M
QY
_0
7
AP
2
S1
S3
S5
S7
S9
S110500
100015002000250030003500
4000
MQM
MQY
Extraordinary good quench behavior
Quench margin 1mJ/cm^3 in DS and 5mJ/cm^3 in MS
(short disturbance)
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
12
Summary of MQXA Quench Training,Inner Triplet
5000
6000
7000
8000
QuenchNo Quench
Que
nch
Cur
rent
(A
)
MQXA-1 2 3 5 4
215 T/m
230 T/m
Quench Sequence
2b
Thermal cycle
Thermal cycle
7 106 9 8 111st T.C.
1912 13
Thermal cycle
14 15112nd
T.C.
16
Bore modification
17 18
0.0
2.0
4.0
6.0
8.0
10
12
14
#1 #2 #3 #5 #4 #2b
#7 #6 #9 #8 #10
#11(
1st)
#12
#13
#14
#11
#15
#16
#17
#18
#19
Straight-SectionLead-EndReturn-End
Num
ber
of Q
uenc
h T
rain
ing
Magnet Number Number of quench reduced
Number of quenches high due to fault in the bore.
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
13
Summary of MQXA Quench Training,Inner Triplet
5000
6000
7000
8000
QuenchNo Quench
Que
nch
Cur
rent
(A
)
MQXA-1 2 3 5 4
215 T/m
230 T/m
Quench Sequence
2b
Thermal cycle
Thermal cycle
7 106 9 8 111st T.C.
1912 13
Thermal cycle
14 15112nd
T.C.
16
Bore modification
17 18
0.0
2.0
4.0
6.0
8.0
10
12
14
#1 #2 #3 #5 #4 #2b
#7 #6 #9 #8 #10
#11(
1st)
#12
#13
#14
#11
#15
#16
#17
#18
#19
Straight-SectionLead-EndReturn-End
Num
ber
of Q
uenc
h T
rain
ing
Magnet Number Number of quench reduced
Number of quenches high due to fault in the bore.
225 T/m
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
14
Summary of MQXB Quench Training, Inner Triplet
6000
7000
8000
9000
10000
11000
12000
13000
14000
Qu
ench
Cu
rren
t, A
4.5K
no quench
205T/m Operating Gradient
230T/m Test Goal
Superfluid
Prototype - Q2P1
01 02 03 04 06 05 1210
LQXB01 LQXB04LQXB03LQXB02
0811
LQXB05 LQXB06 LQXB07
07 09
14
15
Short sample current
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
15
Summary of MQXB Quench Training, Inner Triplet
6000
7000
8000
9000
10000
11000
12000
13000
14000
Qu
ench
Cu
rren
t, A
4.5K
no quench
205T/m Operating Gradient
230T/m Test Goal
Superfluid
Prototype - Q2P1
01 02 03 04 06 05 1210
LQXB01 LQXB04LQXB03LQXB02
0811
LQXB05 LQXB06 LQXB07
07 09
14
15
225 T/m
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
16
Realistic Margin for the Inner Triplet
Using Lucas parameterization and ignoring the cooling (i.e. short times)
Energy Density to reach Tcs in J/m^3 in the MPZ
100 125 150 175 200 2250
2000
4000
6000
8000
1 104
1.2 104
1.4 104
1.6 104
1.8 104
2 104
20000
0
EnergyA Ba g( )( )
EnergyB Bb g( )( )
225100g
T
m
MQXA
MQXB
2 mJ/cm^3, 0.4 mW/cm^3
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
17
Summary of D2-D4 Quench Training
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
18
MQM, MQY, MQXA, MQXB, MBX, MBRB, MBRS
2) No impact on safe energy during commissioning
3a) MQXA, MQXB, MBX, MBRB, MBRS: Replace with the one spare (warm-up, exchange, cooldown ~6 weeks) , repair magnet (6 months or more)
3b) MQM, MQY, MQTL: No complete spares available due to the big number of different combinations. At least two month for building a new assembly, followed by test, installation, ELQA, cool down, ELQA ~1 month
Magnet building workshop needed in 181, Main workshop has to provide welders.
Cryostating must also be available.
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
19
Corrector Types
Main dipoles
– 2464 Sextupole Spool Correctors MCS (100)
– 1232 Decapole-Octupole Spool Correctors MCDO (100) Main quadrupoles (Short Straight Sections)
– 360 Sextupole-Dipole Correctors MSCB (20)
– 192 Tuning and Skew Quadrupoles MQT/S (20)
– 168 Octupole Lattice Correctors MO (20) Insertion quadrupoles
– 16 Sextupole-Dipole Correctors MSCB (see above)
– 122 Dipole Correctors MCBC/Y (14)
– 60 Long Trim Quadrupoles MQTL (4) Inner Triplets
– 27 Inner Triplet Dipole Correctors MCBX (3)
– 9 Sextupole-Dodecapole Inserts MCSTX (1)
– 9 Inner Triplet Corrector Packages MQSXA => MQSX/MCSOX (1)
4659 Corrector Magnets
13 Main types 10 Contracts
Total value of the spare correctors > 2.6 MCHF
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
20
MCD
Histogram for MCDs - Tesla
0
20
40
60
80
100
120
1 2 3 4 More
Number of quenches to reach 550A
Nu
mb
er o
f m
agn
ets
AT-MEL-MC Histogram for MCDs - Tesla
0
10
20
30
40
50
60
Number of quenches to reach 800 A
Nu
mb
er o
f m
ag
ne
ts
AT-MEL-MC
All Indian magnets reached design with the first quench.
Also the number of quenches to reach maximum +2 is considerably lower!
Histogram for MCDs - India
0
50
100
150
200
250
300
1 2 3 4 5 6 7 8 9M
ore
Number of quenches to reach 800 A
Nu
mb
er
of
ma
gn
ets
AT-MEL-MC
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
21
MCO
Histogram for MCOs - Tesla
0
50
100
150
200
250
300
1 2 3 4 5 More
Number of quenches to reach 100 A
Nu
mb
er o
f m
agn
ets
AT-MEL-MC Histogram for MCOs - Tesla
0
20
40
60
80
100
120
140
Number of quenches to reach 150 A
Nu
mb
er o
f m
ag
ne
ts
AT-MEL-MC
All Indian MCO reach 100 A with one quench. In most cases one quench is sufficient to reach 160A
Histogram for MCOs - India
0
50
100
150
200
250
300
350
400
450
1 2 3 4 5 6 7 8 MoreNumber of quenches to reach 150 A
Nu
mb
er
of
ma
gn
ets
AT-MEL-MC
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
22
MCS Antec and CAT
Histogram for MCS - Antec
1
10
100
1000
10000
1 2 3 4 5 Other
Number of quenches to reach 550 A
Nu
mb
er
of
ma
gn
ets
AT-MEL-MCHistogram for MCS - Antec
1
10
100
1000
1 3 5 7 9 11 13 15
Number of quenches to reach 850 A
Nu
mb
er
of
mag
ne
ts
AT-MEL-MC
Histogram for MCS - CAT
1
10
100
1000
1 2 Other
Number of quenches to reach 550 A
Num
ber o
f mag
nets
AT-MEL-MCHistogram for MCS - CAT
1
10
100
1000
1 2 3 4 5 6 More
Number of quenches to reach 850 A
Num
ber o
f mag
nets
AT-MEL-MC
550 A 850 A
Including one extra quench
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
23
MOs
Histogram for M0 - Antec
0
10
20
30
40
50
60
70
80
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Mor
e
Number of quenches to reach 700 AN
umbe
r of
mag
nets
AT-MEL-MC
255 MOs reach the nominal current (550 A) at the first quench, 5 MOs at the second quench
700 A
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
24
MQTs
Histogram for MQT - Ansaldo
0
2
4
6
8
10
12
14
16
18
20
1 2 3 4 5 6 7 8 9 10 11 12 13
Number of quenches to reach 550A
Nu
mb
er o
f m
agn
ets
AT-MEL-MCHistogram for MQT - Ansaldo
0
2
4
6
8
10
12
14
16
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Number of quenches to reach 600 AN
um
ber
of
mag
net
s
AT-MEL-MC
The MQT family has a comparatively high field and gradient,
I don’t expect much better behavior at 1.9 K
550 A 600 A
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
25
Margin of the Q6 in IR3 (6 MQTLs)
0 1 2 3 4 5 6 7 80
5000
1 104
1.5 104
2 104
2.5 104
3 104
3.5 104
Energy BB( )
BeamEnergy BB( )
Energy [J/m^3] needed to raise the temperature from 4.3 K to Tcs, cooling ignored
~in Gray if divided by 10^4
10 mJ/cm^3
Looks better than I expected
1 mW/cm^3
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
26
Inner Triplet Correctors
KEK supplied
CERN supplied
MQXB MQXBMQXA
MCBX
MCBX
BPM
BPM
LMQXC LMQXA
To IP
Q2 Q1
FNAL supplied
A1 / B1 A1 / B1
MQXA
MCBXA
MQSX
LMQXB
MCSOX
Q3
A1 / B1B6 / B3
B4A4A3
A2
MCBX
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
27
Quench performance:MCBX #4 Individual powering
Quenches at 4.4 K
200
300
400
500
600
700
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Quench number
Que
nch
Cur
rent
[A]
Inner Dipole
Inner Dipole 2nd Run
Outer Dipole
Outer Dipole 2nd Run
The
rmal
Cyc
leCourtesy of AT-MTM
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
28
Superconducting motor
MCBX: Combined powering
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
29
MSCB: Quench Performance
Training and Retraining of first 33 MCBM Dipole modules at 4.3 K
0
10
20
30
40
50
60
70
80
90
Q1
Q3
Q5
Q7
Q9
Q11
Q13
Q15
Q17
R1
Q1
R1
Q3
R1
Q5
R1
Q7
R1
Q9
R1
Q11
R1
Q13
R1
Q15
R2
Q1
R2
Q3
R2
Q5
R2
Q7
R2
Q9
R2
Q11
R2
Q13
R2
Q15
R3
Q2
R3
Q4
R3
Q6
R3
Q8
R3
Q10
R3
Q12
R3
Q14
R4
Q1
R4
Q3
Quench
Qu
ench
Cu
rren
t [A
]
The
rmal
cyc
le
The
rmal
cyc
le
The
rmal
cyc
le
The
rmal
cyc
le
Production “fault” was intercepted, newer magnets are much better
Sextupoles are quenching much better as well.
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
30
MSCB: Quench Performance
Training and retraining of first 28 MSM Sextupole modules at 4.3 K
0
100
200
300
400
500
600
700
800Q
1
Q3
Q5
Q7
Q9
Q11
Q13
Q15
R1
Q2
R1
Q4
R1
Q6
R1
Q8
R1
Q10
R1
Q12
R1
Q14
R1
Q16
R1
Q18
R1
Q20
R1
Q22
R1
Q24
R1
Q26
R2
Q1
R2
Q3
R2
Q5
R2
Q7
R2
Q9
R2
Q11
R3
Q2
R3
Q4
Quench
Qu
ench
Cu
rren
t [A
]
The
rmal
cyc
le
The
rmal
cyc
le
The
rmal
cyc
le
AT-MELA
T-M
EL,
K.
H.
Mes
s, “
Cha
mon
ix”
2005
, C
ER
N,
1211
Gen
eva
23
31
Summary
Warm magnets
– Spares available, Manpower not available
– Workshop as for all other warm magnets
DS & MS
– Modules as spares, must be configured to cold masses and cryostated. Workshop in 181 (press) necessary including manpower!
Inner Triplett and Separation Dipoles
– ½ insertion as spare.
– Repair situation unclear to me (Japan/Toshiba- US/BNL/FNAL)
– Expected to fail within 7 years, we must start a replacement design now!
Correctors
– Included in the other magnets
– Spares available, manpower barely sufficient in the long run!
– Repair in house (> ½ year or longer if wire has to be procured)
