LHCｆ: Integration and compatibility with the luminosity monitor

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Presentation transcript:

LHCｆ: Integration and compatibility with the luminosity monitor Takashi SAKO for the LHCf collaboration 9 January 2006 TAN integration meeting

LHCf Neutral particle calorimeters for the calibration of the CR physics Sampling calorimeter of the 50r.l. of Tungsten and plastic scintillator (~30cm) Imaging calorimeter with SciFi and MAPMT/Silicon detector. Two detectors (SciFi/Silicon) are placed in both sides of TAN at IP1

LHCf (prototype photo/CG)

LHCf Operation Strategy LHCf will be installed from the beginning of the commissioning in 2007. LHCf is installed in the 30cm slot in front of LM. LHCf operates as parasite during 2007. LHCf requests maximum crossing angle during its operation. LHCf will be uninstalled when the luminosity exceeds 10^30 to avoid radiation damage and multihit events. LHCf requests a dedicated run when LHC will operate at a low luminosity for TOTEM.

Compatibility with LM LHCf stays at the same position except its operation, which will last a few days. During the operation LHCf vertically moves at maximum about 10cm. Even during the operation, one of the two detectors stay at the parking position. For the LHCf movement, response of LM is calibrated before the LHCf operation. At the time of LHCf uninstallation, LHCf-Copper bars intercalibration will be made if necessary.

a) LHCf at the parking position b) LHCf operation Only on of the two changes the position. c) LHCf-Copper inter calibration (if necessary) d) LHCf uninstalled

How long LHCf will be there? BEST for LHCf

hopefully LHCf Operation BEST for LHCf Operation

How long does LHCf operate? (1) Beta=18m e = 3.75mm rad N =1010 ppb g = 7500 spp = 80mb = 8E-30m2 Rpp = g M N2 s pp 4p b e = 7E-3 / cross Rpg = 5E-5 /cross　for 1.8E12 H2-equiv/m3　　　　　　　　　　　　　　　　　L=280m Frev = 1,1E4 Hz Nbunch = 43 7E-3 ×1.1E4 × 43 = 3500 int / sec Require 104 gamma / run => 1 min g 　0.05　　　　　= 175 g/s　　　　 n 0.05×0.3 = 60 n/s p0 0.05×1/50 = 3.5p0/s Require 104 p0 / run => 3E3 sec (50min.)

How long does LHCf operate? (2) Run scenario (preliminary example) w/ angl arm1 arm2 50min -2cm 80min ? -3cm 120min ? -4cm -1cm 0 cm 200min ? +1cm +2cm 5 min +3cm +4cm w/ angl arm1 arm2 50min -2cm 80min ? -3cm 120min ? -4cm -1cm -2 cm 0cm 200min ? 1cm 2cm 5 min 3cm 4 cm  total ~1800 min ~1.5day