The LHCf experimentMeasurement of Photons and Neutral Pions in the

Very Forward Region of LHC

Letter Of Intent: May 2004Technical report: September 2005Technical Design Report: February 2006

•The physics goals are worthwhile and the proposed experiment appears suited to achieve them

•A few key issues require immediate consideration, and documentation in the update of the TP:

•establish official contact with the relevant structures in the AT/AB departments,

as well as in ATLAS and formulate a complete and costed installation and operation

plan, with a commonly agreed checklist, milestones and timeline

•appoint a technical coordinator (possibly located at CERN?)

•consider and document safety issues

LHCC October 2005 comments:

Experimental Method:Experimental Method:2 independent detectors on both sides of 2 independent detectors on both sides of

IPXIPX

INTERACTION POINT

Beam line

Detector II

Tungsten

Scintillator

Silicon strips

Detector I

Tungsten

Scintillator

Scintillating fibers

140 m 140 m

1. Redundancy2. Background rejection (especially beam-gas)3. Physics single diffractive/double diffractive

Detector location

Y Chamber

Detector #1: transverse Detector #1: transverse projectionprojection

Hamamatsu MA-PMT for scintillating

fibers

PMTs for WLS fibers

4cm

3cm

2cmBEAM AXISBEAM AXIS

Scintillating fibers

WLS fibers to readout plastic

scintillators

130

mm

90 mm

R74

00U

R74

00U

R74

00U

R74

00U

E57

80

E57

80

E57

80

E57

80

Detector #2

4 cm

3 cm

2 cm

6.4 cm

6.4

cm

W +Sci

Silicon

SciFi are replaced by silicon strips 64x64 mm2

Pitch 160 m3 double layers (x-y)1 double layer in front of the calorimeter

Si SiSiSci+W

Si

LHCf: replace first 3 copper bars

The TAN for the luminosity monitor

Photos takenOn April 25th, 2005At CERN

Choice of the Interaction Region• IP8 (LHCB) or IP1 (ATLAS) were identified in 2004• IP1 was definitely chosen by LHCC in October 2005• Detectors on both sides symmetrically wrt interaction point

• LHCf will be installed before the LHC startup (May 2007)

• ‘Ideal’ running conditions:•43 Bunches•Low luminosity (~1030 cm-2s-1)

• ≤ 1 year data taking period

• Detectors will be moved up and down by remote control (during beam setting operations)

Few general commentsFew general comments

Modifications of the TANs (before February 2006?) to:

• install manipulator remotely controlled

• install minicrates for the electronics

• install additional shielding on top of the TAN to protect the detectors in ‘parking position’

Operations required on the LHC infrastructures (1)

Shield

Minicrate

Manipulator

Mechanical drawings of interconnections between TAN andmanipulator, minicrates and shielding should be done a.s.a.p.to drill holes before TAN installation in tunnel

• Modifications of the TANs (before February 2006) to:• install manipulator• install minicrate for the electronics• install additional shielding on top of the TAN to protect the detectors in ‘parking position’

• Cables (to be pulled before February 2006?):

• Power lines • DAQ lines (optical fibers)• Analog signals for trigger• Slow controls• Cables for manipulator

•Water cooling for the electronics

•220 V ?

Operations required on the LHC infrastructures (2)

LHCf and LUMI monitor inside TAN

LUMI monitor inside TAN is beyond LHCf (replacing 4th copper bar)

LHCfLumi

Cu Bar / ZDC

IP1

LHCfLumi

Cu Bar / ZDC

LHCf 54 X0 thicknessBeam Pipe is shaped to have a projected thickness of 1 X0 on 10 x 10 cm2 region

LUMI Monitor see different thickness of material depending on the LHCf position(one of the LHCC concerns!!!!)

We are studying the problem of the LUMI calibration together with W.C. Turner and his group from LBNL

Technical coordinator at CERN starting from December 2005• Strict contact with TS/LEA and LEMIC• Strict contact with Atlas experiment

• Electronics crates in USA15• Cables in the Atlas zone• Trigger

Demande Installation Cables (DIC) in preparation

Engineer Change Request (ECR) in preparation for all the TAN and LHC related activities

The next steps…

The calorimeter in the test The calorimeter in the test experimentexperiment

Scintillating Fibers

Scintillators plane

Size: 9.6 cm x 29 cm x 55 cm