TAN study group, 21/09/2012 A. L. Perrot

LHC TAN forward detectors

Outline

Location in LHC

Specificities

Detectors purpose

Modifications in the LHC tunnel

Services

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Location in LHC

LHCf, BRAN,

ATLAS ZDC

Point 5

Point 6

Point 7

Point 8

Point 1

Point 3.3

Point 3.2

Point 2

CMS

Point 4

LHC-b

ATLAS

BRAN, CMS ZDC

BRAN,

ALICE ZDC

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Location in LHC

D2Q4

TAN

Q4D2

UJ13

UJ14

US15UJ16

UJ17

USA15

Q1Q2

Q3

D1

RI13

RI17

TAN

Q2Q3

D1

Q1

Point 1

XRP2

XRP3

XRP1

XRP2

XRP1

XRP3

D2

D2

Q4

Q4

TAN

TAN

Q2Q3

Q1

Q1Q2

Q3

D1

D1

USC55

UJ53

UJ57

R57

Point 5

3

In each TAN 1 slot with 10 movable Cu bars

Possibility to add instrumentation

Slot : l1000 x w95 x h605

Location in LHC

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LHCf

ATLAS ZDC

BRAN

TAN detectors Point 1

TAN detectors Point 5

HCAL

BRAN

ECAL

CMS ZDC

Location in LHC

LHCf: LHC forward physicsBRAN: Beam RAdiation Neutrals monitorZDC: Zero Degree Calorimeter

ECAL = Electromagnetic CALorimeterHCAL = Hadronic CALorimeter

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TAN detectors in Point 1

June 2009

LHCf

BRAN -ICBRAN-Sci

IP1

ATLAS ZDC HCAL

ATLAS ZDC ECAL

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TAN detectors in Point 5

CMS ZDC HCAL

IP5

CMS ZDC ECAL

BRAN -IC

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LHC experiments detectors located inside the LHC tunnel => coordination in LHC machine & experiments caverns/services areas

inside LHC machine absorbers TAN, located all together in 1m long slots & few

mm from the beam pipe;

designed & produced in Japans/Italy/USA to be inserted in very narrow locations inside already installed LHC equipment (few mm tolerances)

exchange/removal of TAN detectors during LHC operation => radiological issues

Specificities / challenge

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LHCf

Understanding high energy cosmic ray phenomena => (calibration of MC codes at 1017 eV (Elab. equiv of LHC)help to decide which model is best for MC simul. of HECR air showers)

Understanding of the energy distribution of particles emitted in the very forward region of hadronic interactions

LHCf will measure forward production spectra of photons and π° (and neutrons)

Simulation atmospheric shower due to 1019 eV proton

Purpose:

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silicon layers

scintillators

tungsten layers

scintillators

tungsten layers

scintillating fibers

I P1Detector #1 Detector #2

(RI132- left to IP1) (RI171- right to IP1)

TAN TAN

Courtesy of LHCf Firenze teamCourtesy of LHCf Nagoya team

1 detector in the TAN absorber on each side of Point 1 e.m. calorimeters with position sensitive layers

LHCf

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LHCf

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ATLAS Zero Degree Calorimeter

ZDC detector:- tungsten/quartz-fibers layers - 2 calorimeter sections: EM and hadronic- 1 detect.= 1 mod. EM + 3 mod. Had

Location:1 detec. in each TANs around of IP1

Primary role: - event characterization in HI collisions- obs. neutral partic. produced in HI or pp collisions

Secondary role: - luminosity measurement - beam tuning

PMT PMT

Top view

Beam

Quartz windowPMT XP3292B

Tungsten

1mm quatrzrods

Steel

Glass mirrorair light pipe

Quartz windowMAPMT R7600-M16 2x3x16ch

Beam

Quartz fibers

Quartz fibers

EM module

PMT PMT

Top view

Had. module

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ATLAS Zero Degree Calorimeter

Installation in 2 phases

without LHCfwith LHCf

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Beam RAte Neutrals monitor (BRAN)

Role: monitor and optimise the LHC relative luminosity on a bunch by bunch basis(idea: utilising the very forward flux of secondaries from IP that are intercepted by the TAN)

BRAN detector:- designed and built by Berkeley - work in collaboration with BE/BI- segmented, multi-gap, pressurized Ar-N2 ionisation chamber (4 quadrants; 1 quadrant: 60 gaps of 0.5mm separated by 1mm thick Cu plates)

Location: in both TANs on each side of IP1 and IP5

Courtesy of K. Chow- LBNL

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Peel off case

Remove copper filler bars

Detail of ionization

chamber area

BRAN – inside views

Courtesy of K. Chow- LBNL

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CMS Zero Degree Calorimeter

Role: - Heavy ions physics studies (A+A, p+A and p+p collisions )- Labs of p+p, p+A, A+A coll.,- stot of p+p and A+A coll.,

ZDC detector:- a tungsten plate/quartz fiber ribbon sandwich - 2 calorimeter sections: e.m. and hadronic- 1 detect= 1 EM sect.+ 4 equal had. sect.

Location: in both TANs on each side of IP5.

Courtesy of CMS/ZDC team

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CMS Zero Degree Calorimeter

ZDC hadronic module (inside view)

ZDC hadronic module (ready for installation)

ZDC hadronic module (inserted in the TAN slot)

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Modifications of the LHC machine

L<1033 cm-2 s-1:LHCf and/or the ATLAS ZDC => sufficient shielding of the machine elements

L> 1033 cm-2 s-1: LHCf and/or the ATLAS ZDC =>replaced by Cu bars to avoid the quench of D2

Radio Protection requirement: remote manipulation of the detectors/Cu bars and underground storage in the machine tunnel.

Safety requirement: footbridge above the QRL

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Removal of the detectors

Point 1 remote handling system March 2009

Point 5 remote handling system under constructionInstallation during LS1

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Storage of the detectors underground

Dedicated bunkers built in adjacent UJs

Sarcophagi for ZDCs Sarcophagi for BRANs

Dedicated bunkers built in adjacent UJs

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Paths followed by CMS ZDC cables

XRP2

XRP3

XRP1

XRP2

XRP1

XRP3

D2

D2

Q4

Q4

TAN

TAN

Q2Q3

Q1

Q1Q2

Q3

D1

D1

USC55

UJ53

UJ57

R57

Point 5

CMS-ZDC rack

UL55

laser room

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Footbridge above QRL

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Footbridge above QRL

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Associated services

Work performed on TAN: holes drilling for patch-panels installation of LHCf and BRAN (TS/IC,TS/LEA).

Cables and fibers • installed between TANs and racks located in ATLAS and CMS services

areas• different paths followed (depending of cable types);• compatibility with the cables already installed/foreseen for the machine

and the ATLAS experiment.• additional cable trays installed in LHC tunnel

Additional power plugs

BRAN: - gas installation and distribution (TS/LEA/gas section)• locked caged area + change over panel (Pt1-US15 and Pt5-UJ56)• gas distribution network between the caged area and the TAN

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LOCKED CAGE

TAN

Gas distribution at Point 1

Special agreement with safety dept. to have gas bottles underground

Associated services

BRAN:

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D2

Q4

TAN

Q4D2

UJ13

UJ14

US15UJ16

UJ17

USA15

Q1Q2

Q3

D1

RI13

RI17

TAN

Q2Q3

D1

Q1

Point 1

LHCF and ATLAS ZDC racks

road 1

road 2

Paths followed by LHCf and ATLAS ZDC cables

detectors

detectors

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LSS1

LSS1

UJ13

ATLAS exp. cavern

Cables trays for LHCf and ATLAS ZDC

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Thanks for your attention