LHCf Detectors

Sampling Calorimeter• W 44 r.l , 1.6λI • Scintilator x 16 Layers

Position Detector• Scifi x 4 (Arm#1)• Scilicon Tracker x 4(Arm#2)

Detector size W90 x D280 x H620

Arm#1Arm#2 LHC Ring

ATLAS

Where we are with Arm1?• Arm1 was fully assembled in Japan in July 2006

(scintillators + fibers + Tungsten) and brought to CERN for the Beam Test

• Plastic scintillators + Light guides + Tungsten: – Production in Japan finished in July 2006– They were brought in Florence end of July

• First Silicon module (Milestone INFN):– Production in Florence finished in July 2006

• Assembly of Arm2 for beam test was done in Florence in August 2006

• Arm2 was brought at CERN for the beam test on August 16, 2006

• To complete Arm2 3 more silicon modules are necessary– We will finish the modules before Christmas

• Arm1 and Arm2 are now both in Florence clean rooms• Final integration of Arm2 will be done before March 2007

Where we are with Arm2?

Florence clean room (thanks to CMS!!!!!)

Pre-calibrations

• For all PMTs– PMT gain at "1 MIP" was pre-calibrated by using plastic

scintillator with 90Y beta ray. – HV dependence of gain was measured with all PMTs by

using N2 laser.– Saturation effect was measured up to 7 TeV gamma

shower maximum.

• For all Scintillators– The position dependence of light yield was measured to

make correction tables

• For Scifi & MAPMTs– Gain and photon yield difference of each channel was

measured by 12C ion beam.

Pre-calibrations

Position dependence of light yield of scintillator

0 1055x104 0 1055x104

Light Intensity [MIPs] Light Intensity [MIPs]

AD

C C

ou

nt

7TeV shower Maximum

7TeV shower Maximum

LinearityLight Intensity - ADC

PMT Linearity checked by N2 Laser.

Beam test @ SPS

• Arm1 & Arm2 were delivered to Cern on August 16, 2006• They were set up for the beam test• Beam period: August 28, September 4• H4 Test Area

– Electrons up to 200 GeV– Protons up to 350 GeV– Muons

• Goal of the test beam:– Energy calibration of the calorimeter– Measurement of the spatial resolution of silicon system

• Florence telescope (ADAMO) is used to precisely reconstruct tracks

SPS Beam Test

LHCf Detector

Silicon Tracker

Moving Table Trigger Scintillator

• CERN : SPS T2 H4• 2006 Aug. 28 – Sep. 4• Incident Particles

–Proton 　 150,350GeV/c–Electron 100,200GeV/c–Muon 150GeV/c

Setup

•DAQ rate –1kHz at Arm#1( fast enough for 7 TeV

run)

Event View - electron -

X Y

@ 6r.l.

@ 10r.l.

@ 30r.l.

@ 42r.l.

e-

Shower profile re-constructed from ADC of Scifi

200GeV/c Electron Beam Event @ 40mm Calorimeter.

ADC of scintillator Layer 0 - 11 : 2 r.l. step Layer 12 -16 : 4 r.l. step

Event View - proton -Proton 350GeV/c

40mm Calorimeter ADC

40mm shower profile①6r.l. ②10r.l. ②30r.l. ②42r.l.

Incident Position　 Arm ＃ 1 　 40mmTower

the Other Event

Status of Analysis

• Analysis of H4 beam line test is under going. • Data and MC show reasonable agreement

even at very preliminary stage. • Now checking …

– energy scale, energy resolution, position dependence, position resolution,particle identification.

ADC distribution of third plastic scintillator layer (6r.l.) for 200GeV electron

Few plots of the beam test results for silicon

A high energy electron shower seen on x and y silicon

<Noise> ~ 5 ADC counts

X Y

Energy measured100 GeV electrons

High Gain

X

Y

Energy measured350 GeV protons

High Gain

X

Y

Now the integration in LHC…

1. All the cables have been pulled on both sides2. The quartz fibers for calibration have been pulled on both sides3. The container for the fibers of Arm2 have been pulled, fibers will be installed

later4. Installation and commissioning dates have been fixed

– LSS1L • Bake-out of the section: December 2006;• BRAN and LHCf commissioning: from 8/01/2007 to 26/01/2007;• BRAN and LHCf final installation: from 14/08/2007 to 17/08/2007.

– LSS1R• BRAN and LHCf commissioning: from 23/04/2007 to 11/05/2007;• bake-out of the sectiont= June, July 2007;• BRAN and LHCf LSS1R final installation: from 09/10/2007 to 12/10/2007.

5. Transport and installation procedure is under detailed study6. Thermal tests in the Tan will be done this week with a thermal mockup. 7. Position of racks in USA15 are defined, racks are allocated, the precise

crate allocation in the racks is under study

Very big help from TS/LEA group (Anne-Laure Perrot and Daniela Macina)

Arm#1,Arm#2

AR

M#

1A

RM

#2