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Presentation transcript:

University of Wisconsin-Madison Endcap Notes James N. Bellinger University of Wisconsin-Madison 5-August-2010 James N. Bellinger 5-Aug-2010

Comparison w/ track-based Direct comparison is slightly misleading Correlations not simple Can compare PseudoRPhi No track-based sensitivity to Z No hardware sensitivity to PseudoR (along SLM) Let ring float for best fit to hardware positions Let transfer plates float (only know by PG) James N. Bellinger 5-Aug-2010

Comparison w/ track-based Track-based connects chambers in rings Hardware connects chambers along lines Lines are fixed wrt each other by PG Let rings float Let transfer plates float James N. Bellinger 5-Aug-2010

Fit allowing transfer plates to move Fit to minimize track-hardware chamber center residuals in Pseudo-Rphi, letting SLMs float Fit moves SLM centers by an average of 0.6mm, with an rms of 1.2mm Expected PG accuracy is about 0.3mm It rotates the SLM’s by angles with rms of 0.21mrad About 1.5mm rms shifts in transfer plate phi position Fit only done for stations with SLMs and 2 rings: No ME4 or ME1 Quoted numbers from last week were not duplicated James N. Bellinger 5-Aug-2010

Fit decreases residual mean and improves RMS of residual Station/Ring Raw mean(mm) Raw rms Fit mean(mm) RMS after fit -2/1 -0.53 1.75 0.40 1.55 -2/2 -0.67 2.50 -.40 1.40 -3/1 -0.19 2.80 -0.16 2.41 -3/2 0.19 0.47 0.16 0.98 2/1 0.90 0.93 0.50 1.08 2/2 1.86 2.21 -0.50 1.17 3/1 -1.23 2.39 0.09 2.38 3/2 -0.84 -0.09 0.87 Except here James N. Bellinger 5-Aug-2010

Further work Not at 0.6mm level It ought to be Use variant of Oleg’s fit instead of Cocoa Compare to PG instead of tracking James N. Bellinger 5-Aug-2010

BACKUP Histograms of raw residuals track- hardware and residuals after the fit James N. Bellinger 5-Aug-2010

PseudoRPhi Comparison by ring: ME+2 and ME+3 Raw residuals ME+2 ME+3 Ring 1 Ring 2 James N. Bellinger 5-Aug-2010

PseudoRPhi Comparison by ring: ME+2 and ME+3 Fit residuals ME+2 ME+3 Ring 1 Ring 2 James N. Bellinger 5-Aug-2010

PseudoRPhi Comparison by ring: ME-2 and ME-3 Raw residuals ME+2 ME+3 Ring 1 Ring 2 James N. Bellinger 5-Aug-2010

PseudoRPhi Comparison by ring: ME-2 and ME-3 Fit residuals ME+2 ME+3 Ring 1 Ring 2 James N. Bellinger 5-Aug-2010

PseudoRPhi: No change in residual with increasing radius Raw residuals Fit residuals Ring 1 Ring 2 James N. Bellinger 5-Aug-2010