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RADIATION LEVELSTODAY AND IN THE FUTURE
R2E and Availability Workshop
Oct 14, 2014
Francesco Cerutti on behalf of the whole team
Oct 14, 2014 F. Cerutti R2E and Availability Workshop 2
RELEVANT QUANTITIES
- activation related: RadioProtection matters:
residual dose rates (uSv/h) activity (Bq, vs Exemption Limits) intervention, waste
- peak absorbed dose (MGy), in the magnet coils
Displacements Per Atom, peak particle fluence (cm-2)
for short term: instantaneous power (W, mW/cm3) on the collimators,
beam intercepting devices,
magnets
- High Energy Hadron fluence, 1 MeV neutron fluence, dose maps around
the machine
electronics
locations
in the “long” term
Oct 14, 2014 F. Cerutti R2E and Availability Workshop 3
TODAY AND FUTURE LOSS SOURCES [I]
beam-beam collisions
RUN 1 RUN 2 RUN 3 HL-LHCbeam energy
[TeV] 3.5 - 4 6.5 7 7
integrated luminosity
[fb-1]
proton-proton(ATLAS-CMS) 30 300 + 3000
+ 33%
proton-proton(LHCb) 3 50
ion-ion(ALICE) 10 nb-1
7 TeV p + 7 TeV p
@ L0 = 1034 cm-2 s-1
yields 1 kW
towards each (L&R) side
Oct 14, 2014 F. Cerutti R2E and Availability Workshop 4
TODAY AND FUTURE SOURCES [II]
beam impact on collimator
jaws
RUN 1(2012)
RUN 2 RUN 3 HL-LHC
beam energy [TeV] 4 6.5 7 7
2808 bunches of 1.15 1011 7
TeV p
@ 0.2 h beam lifetime
yields 500 kW
towards the collimation system
lost protons[1016] beam 1 0.56 1
per ~40 fb-1
beam 2 0.63 1per ~40 fb-1
IR3/IR7beam 1 < 10% < 10%
IR3/IR7beam 2 half wrt B1 < 10%
injected – dumped –
collided
BLM signals corrected by the FLUKA response
factor
Oct 14, 2014 F. Cerutti R2E and Availability Workshop 5
beam interaction with residual gas
(not relevant for long term: beam interaction with dust particles)
TODAY AND FUTURE SOURCES [III]
RUN 1 RUN 2 RUN 3 HL-LHCbeam energy
[TeV] 3.5 - 4 6.5 7 7
beam current [A] 0.43 0.58 1.09
running time [days]
gas density profile [m-3]
1015 H2 eq. vacuum gauge reading of X 10-8 mbar
Oct 14, 2014 F. Cerutti R2E and Availability Workshop 6
MACHINE MODEL [I]
today
Oct 14, 2014 F. Cerutti R2E and Availability Workshop 7
MACHINE MODEL [II]
HL-LHC
Oct 14, 2014 F. Cerutti R2E and Availability Workshop 8
ESTIMATE OVERVIEW
triplet & D1
triplet area & UJ16
RR57
triplet & D1 & D2
US85
MB
DS
MBW & MQW
LSSMB
arc, RE
UX45 & US45
UP33 & UJ32
Oct 14, 2014 F. Cerutti R2E and Availability Workshop 9
P1: QUADS, CORRECTORS AND SEPARATION DIPOLE
present D1:
MBXW.A4 at the same order
as MBW.B6 in P7 (the latter now screened)
8 quads + 2 (12) dipoles times two
(P5)
Oct 14, 2014 F. Cerutti R2E and Availability Workshop 10
P1: FUTURE TRIPLET AREA AND UJ16
2 109 per
year
vertically averaged over 40 cm
Oct 14, 2014 F. Cerutti R2E and Availability Workshop 11
P5: PRESENT MATCHING SECTION AND RR57
collision
debrisbeam 1 - gas
TCL6 (@10s)
0.58 A1015 m-3 H2 eq. density
107 s = 100 fb-1 / L0
vertically averaged over
40 cm
7 TeV proton energy
Oct 14, 2014 F. Cerutti R2E and Availability Workshop 12
P5: RR57 DURING 2012 OPERATION
FH>20MeV [cm-
2](L2012)
5RM08S 5RM09S
FLUKA 6.1 108 3.0 107
DATA 4.56 108
(256 upsets)4.32 107
(25 upsets)
Agreement within 30%
Oct 14, 2014 F. Cerutti R2E and Availability Workshop 13
P8: TRIPLET AND DIPOLES
8 quads + 2 dipoles + 2
dipoles
additional coil mask advisable!
Oct 14, 2014 F. Cerutti R2E and Availability Workshop 14
P8: US85[cm-2]
[Gy]
vertically averaged from -1.1m to 2.4m(0 is the beam height)
longitudinally averaged over 4m(from 2m to 6m, 0 is the cavern center)
x [cm]x [cm]
y [cm]
Oct 14, 2014 F. Cerutti R2E and Availability Workshop 15
P2: MAIN DIPOLE IN DS CELL 10
[mW/cm3]
x [cm]
2.76 TeV/n 208Pb (81+) from Pb+Pb @ 6 1027
cm-2 s-1
20 MGy over 10 nb-
1
[R.
Bruce]
2 main
dipoles
reduction of a factor 25 (100) with 0.5m Cu (1m W) TCLD and 11T MBHDP
Oct 14, 2014 F. Cerutti R2E and Availability Workshop 16
P7: LSS
vertically averaged over 10cm
7 TeV 1.15 1016 lost protons per beam
beam 2 mirrored
proton losses in the collimator jaws (for tight settings: TCPs @ 4.3s and TCSG @ 6.3s) from the collimation team
no beam 2
4 warm dipoles + 24 warm quadrupoles [times two + 2 MBW
(P3)]
discussed on Thursday
Oct 14, 2014 F. Cerutti R2E and Availability Workshop 17
P7: DS MAGNETSproton losses in the collimator jaws (quench test settings) from the collimation team
4 TeV 0.63 1016 B2 protons lost in 2012
beam 2
Oct 14, 2014 F. Cerutti R2E and Availability Workshop 18
P7: BELOW THE DS MAGNETS4 TeV0.63 1016 B2 protons lost in 2012
proton losses in the collimator jaws(quench test settings)from the coll. team
beam 2
QPS, CRYO, EPC, and BI equipment
Oct 14, 2014 F. Cerutti R2E and Availability Workshop 19
ARC: BELOW THE MAGNETS
0.58 A1015 m-3 H2 eq. density
107 s
7 TeV proton energy
QPS, CRYO, EPC, and BI equipment
both beams
Oct 14, 2014 F. Cerutti R2E and Availability Workshop 20
ARC: RE387 TeV proton energy 0.58 A 3 1014 m-3 H2 eq. density 107 s
both beamsvertically averaged over 20cm
10 m
-20 m10-6
10
10-5
10-3
10-1
10-2
1
10-4
dose [Gy]
[LHC Project Note 363]
103
1010
104
106
108
107
109
105
104
1011
105
107
109
108
1010
106
HEH fluence [cm-2] 1MeV neutron fluence [cm-2]concrete
chicane
Oct 14, 2014 F. Cerutti R2E and Availability Workshop 21
P4: UX45 AND US454 TeV proton energy 0.39 A 73.5 days
vertically averaged over 2m around the beam height
[cm-2]
[cm-3]
[G.
Bregliozzi]
see also LHC Project Note
342
Oct 14, 2014 F. Cerutti R2E and Availability Workshop 22
P3: UP33 AND UJ32 7 TeV proton energy 0.58 A 1015 m-3 H2 eq. density 180 days
beam 2 - gas
HEH fluence
[LHC Project Note
364]
+ collimation
losses7 TeV proton energy 0.58 A 3 1014 m-3 H2 eq. density 107 s
both beams
UJ32 dose [Gy]HEH fluence [cm-
2]1MeV neutron fluence [cm-2]
≤~10-1 5 107 5 108
Oct 14, 2014 F. Cerutti R2E and Availability Workshop 23
CONCLUSIONS
Let’s take note of what is
missing
Oct 14, 2014 F. Cerutti R2E and Availability Workshop 24