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Test Beam Proposals for Beam Targets Alignment and Procedure Check

This document outlines three test beam proposals including the alignment of layer 9, tuning of fitting weight parameters, and checking the alignment procedure. The proposals include the beam parameters, number of positions, and the purpose of each target.

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Test Beam Proposals for Beam Targets Alignment and Procedure Check

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  1. Proposals for the test beam P.Zuccon on behalf of S.Haino

  2. Test Beam targets • (1) Target: Alignment of layer 9 • (2) Target: Tune fitting weight parameters • (3) Target: Check of alignment procedure

  3. Test Beam Whishes(1) (1) Target: Alignment of layer 9 • Beam: 400 GeV proton • Number of positions: 80~100 Boundary conditions: • (1-a) Inner layers (L1-L7), the layer on TRD (L1N) are already once aligned with no-B CR run and Feb. test beam We can assume that the relative position between ladders on the same layer should be kept. • (1-b) We know nothing about the layer on Ecal (L9) Logic of the positions: • (1-c) Scan all the 16 ladder of L9, 5 positions each (3 for dX, dY, dTheta(=dY/dX), 2 for dZ), i.e. N=16x5 = 80 • (1-d) Fix the position in the internal layer (say Z=0) where we already took in the Feb. test beam • (1-e) Ladders on L1N are mostly scanned at the same time • (1-f) We could add another set of points (10~20) to complete the scan of L1N

  4. Test Beam Whishes(2) (2) Target: Tune fitting weight parameters • Beam: Middle energy (30 -50 GeV) proton/pion Number of positions: 80~100 (same as Target (1)) • Purpose: • (2-a) Check the residual distribution between inner (L1-7) fit and L1N/L9 hits • (2-b) Compare them between TB and MC • (2-c) Tune the fitting weight parameter to achieve the best performance of ~100 GeV

  5. Test Beam Whishes(3) (3) Target: Check of alignment procedure • Beam: CR muons Just before and/or after the test beam (1) take CR muon data for 16~20 hours. • Purpose: • (3-1) Apply standard alignment procedure with the CR muon data (B-on) • (3-2) Compare the alignment parameters between CR and TB to check how well the alignment procedure works even with B-on condition.

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