LHCCWG 24 April 2006

RadMonRadMon Radiation Monitoring System Radiation Monitoring Systemfor the LHC Machine and experimental for the LHC Machine and experimental

cavernscaverns

T. Wijnands, C. Pignard, D. McFarlane, E. Dimovasili,

K. Cwalina

CERN TS department – LHC experimental areas

Acknowledgements :

Radiation facilities : UCL Louvain-La-Neuve, PSI Villingen, TSL Uppsala, CIS-BIO (CEA

Saclay), Ljubljana, PROSPERO (CEA-Valduc)

Radiation community : PH/MIC, Radecs community, ESA, JPL

Special thanks : P. Proudlock, J-J Cloye, A-L Perrot, B. Hallgren, F. Locci, J. Palluel, R. Tesarek (FNAL), TS/DEM

LHCCWG 2

Particle spectra in LHC underground areasParticle spectra in LHC underground areas

LHCCWG 3

Parameterization of a complex radiation fieldParameterization of a complex radiation field

Surface DamageBulk damage

Single Events

Doseh > 100 KeV

h > 20 MeV

RadfetPIN Diodes

SEU counter

nuclear cascade

radiation damage semiconductors

Radiation Monitor

LHCCWG 4

RADMONRADMON – monitor parts & assembly – monitor parts & assembly

LHCCWG 5

RadMon Calibration in radiation facilitiesRadMon Calibration in radiation facilitiesPROSPERO REACTOR

CEA Val Duc - Dijon

PAGURE 60Co source

CEA Saclay - Paris

GANTRY 250 MeV protons

PSI Villingen

OPTIS 60 MeV protons

PSI Villingen TSL 177 MeV Neutrons

TSL Uppsala -Sweden

LHCCWG 6

7

81

2

ALICE

45

CMS

6

LHCb

ATLAS

3.3

3.2

RADMONRADMON architecture – areas covered architecture – areas covered

309 monitors in total

LHCCWG 7

RadMon installation in 4L completedRadMon installation in 4L completed

D. McFarlane, C. Pignard, K.Cwalina, T. Wijnands

LHCCWG 8

Experimental Areas coveredExperimental Areas covered

• LHCb cavern – UX85 & US85• CMS cavern - UX55 & USC55• ATLAS cavern – UX15• FP420• ZDC Alice• ATLAS Roman Pots• LHCf• …

LHCCWG 9

CMS – RadMon layoutCMS – RadMon layout

LHCCWG 10

LHCb cavern – UX85LHCb cavern – UX85

LHCCWG 11

SPS primary target hall BA80SPS primary target hall BA80

LHCCWG 12

SPS proton run 2004 – super cyclesSPS proton run 2004 – super cycles

SPS Super cycles

LHCCWG 13

SPS proton run 2006 - startupSPS proton run 2006 - startup

0 1 2 3 4 5 6 7 80

2

4

6x 10

10

Time [days]

hadr

ons

[cm

-2]

RADMON in TCC2 Test Facility

0 1 2 3 4 5 6 7 80

1

2

3

4

5

Time [days]

Dos

e [G

y]

0 1 2 3 4 5 6 7 80

1

2

3

4

5x 10

10

Time [days]

1 M

ev e

q. n

eutr

ons

[cm

-2]

Bending magnet

M2 beam line

LHCCWG 14

Low beta quads probably a line source of radiationHigh failure rate of LVPS at proton side CDF

CDF Collision hall at FNALCDF Collision hall at FNAL

antiprotonsprotons

N

SEW

RADMON radiation monitor

R. Tesarek (FNAL)

LHCCWG 15

CDF collision hallCDF collision hall

R. Tesarek (FNAL)

LHCCWG 16

Radiation levels in CDF collision hallRadiation levels in CDF collision hall

0 10 20 30 40 50 60 70 80 90 1000

1

2

3

4

5

6

7

Time [days]

Do

se

[ra

d]

Outer (NW)

Inner (NW)

Inner (SW)

Outer (SW)

0 10 20 30 40 50 60 70 80 90 1000

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2x 10

8

Time [days]

Ha

dro

n f

lux

[c

m-2

]

Outer (NW)

Inner (NW)

Inner (SW)

Outer (SW)

LHCCWG 17

ES separator accident in the TevatronES separator accident in the Tevatron

• One of the electrostatic separators (ES) sparked• Quench in magnet• Vacuum was lost• Several weeks downtime for repair Tevatron

ES system separates the proton and antiproton beams from each other to avoid parasitic collisions away from the interaction regions

LHCCWG 18

Radiation due to ES accident at FNALRadiation due to ES accident at FNAL

ONW INW ISW OSW Time

011 009 167 388 Nov 21 16:12:51 2005011 009 168 392 Nov 21 16:13:06 2005

• No measurable variation of dose• No measurable variation of 1 MeV eq. neutrons• h > 20 MeV ONLY in SW region of CDF detector :

corresponding fluence : 4x106 cm-2 (h > 20 MeV)

LHCCWG 19

Point 8 Right – TI8 test on 22 July 2007Point 8 Right – TI8 test on 22 July 2007

Injection line

LHCCWG 20

Data storage and real time displaysData storage and real time displays

LHCCWG 21

LHC sector testLHC sector test

?

?

?

From Brennan G., Chamonix 2006

LHCCWG 22

• RADMON system• Mobile radiation measurements under SC magnets, in caverns and in LSS• 1 Hz data logging with real time data display• Spatio-temporal resolution complementary to BLMs

• Proposal for LHC startup (TI8 test, sector test, eng. run)• Establish adequate subset of BLMs/RadMons for each stage• Display and storage data subset for immediate analysis in CCC

• Proposal for nominal LHC : Radiation measurements DB• Store subset radiation measurements after each beam loss

• How are beam losses and radiation levels are related (spatio-temporal)• How is the LHC being operated • How is equipment performing under radiation• How accurate are the simulations• How efficient is the shielding

Summary & conclusionsSummary & conclusions