Contents of talk May 2 nd 2006 Y. Muraki on behalf of the LHCf 1. Physics goal 2. The BRAN detector 3. The particle distribution inside the BRAN 4. In.

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Presentation transcript:

Contents of talk May 2 nd 2006 Y. Muraki on behalf of the LHCf 1. Physics goal 2. The BRAN detector 3. The particle distribution inside the BRAN 4. In case the BRAN will be located at 5 th slot (30cm Cu, 3.85cm W, 10cm W)

Our Physics Goal The exposure time is only a few hours

The BRAN detector Luminosity detector in TAN

Luminosity detector in its case “Guts” of the luminosity detector that is inserted into case Detail view of bottom Ionization chamber Copper mounting plate Printed circuit board BEAM

Cross section detail, parallel to beam Case wall copper filler Case wall copper mounting plate Macor chamber wall Ground plane comb (in blue) signal comb (in orange) Ceramic printed circuit board

Cross section detail, normal to beam Case wall Macor chamber wall Ground plane comb (in blue and red) signal comb (in orange)

Configuration of LHCf-BRAN

Particle distribution in BRAN as a function of beam center

The ratio of particles detected by the 4 parts of the BRAN detector

The threshold of BRAN is set at > 500 particles

Particle distribution of Arm #2

Particle distribution of Arm 2 The threshold of BARN >500 ptls.

Ratio of particles detected by each BRAN sensor

The position resolution of the LHCf for Arm #1

The particle distribution in BRAN for original Cu 30 cm

The particle distribution in BARN for 3.85cm tungsten (W) plate

Particle distribution in BRAN without LHCf (linear scale)

Particle distribution in BRAN without LHCf (log scale)

In the case the BRAN is set at the 5 th slot

The particle distribution in BRAN for 10cm thick tungsten block is used

Summary of talks 1. The LHCf experiment can resolve the highest energy cosmic ray problems. 2. Present configuration of LHCf-BRAN can measure the beam neutral center by both detectors independently. 3. However installation of the BRAN at the 5 th slot will provide us a better result.

The Arm #1 beam pipe structure

The Arm #2 beam pipe structure

Position identification by the LHCf