James N. Bellinger University of Wisconsin-Madison 18-June-2010

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James N. Bellinger

University of Wisconsin-Madison

18-June-2010

CSC Chamber CentersCSC Chamber CentersCSC Chamber CentersCSC Chamber Centers

James N. Bellinger 18-June-2010

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While searching for the Z

• Himali found some discrepancies in Z between monitored and unmonitored

• I noticed a large excursion in X/Y, traced it to Oleg’s PG file– 9mm is a bit excessive: suspected typo and

changed 699etc to 679etc

• Temporary test only! May just set to ideal instead.

– Checked if some of the other numbers agreed with the PG file we got from tracking.

– They didn’t. Crud


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Back to the PG basics

• Redo chamber centers from Oleg’s files

• Document and automate as I go

• http://www.hep.wisc.edu/~jnb/cms/predictCSC/index.html

• Documentation mostly done

• Created an xml file with only PG estimates, no monitored chambers– Adding the monitored chambers is only another

day to do and document, but here it is Friday already


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What happened to interpolation?

• It was only suited for the ME+1/2 data: ME1/3 isn’t ready because the Z work isn’t done, and ME-1/2 is too sparse.

• Rather than have only one (not yet proved better) procedureal exception, do the whole thing the same way for now.

• http://www.hep.wisc.edu/~jnb/cms/16Jun2010/pgonly.xml– Absolute coordinate xml file


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Testing

• Pivarski’s tilt tool– ME+ all have Z(outer)>Z(inner)

– ME- all have Z(outer)<Z(inner)

– OK

• The deviation display plots follow


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Deviation Display: x/y


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Deviation Display: z


??

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Z deviations

• Even and odd vary by O(1.1 mm)– Odd chambers don’t have coded targets surveyed,

so their Z’s are ideal

– Investigating


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Deviation Display: RotX


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Deviation Display: RotY


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Deviation Display: RotZ


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Prospects

• I have a documented procedure for creating the positions of the unmonitored chambers

• I need to compare results with the older version (this is an hour old)– Need to track down source of 1.1cm shift at ME-4/1

• Once it looks sane, add monitored chambers; should have this tomorrow (tonight if the shift is easy to find)

• Needs versioning to fit into the overall system


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UPDATE

• The “PG-only” constants use – YE1 disk centers/angles from May 2010 Link fit

– YE3 disk centers/angles from Survey UR-0161

– YE2 disk centers/angles from Survey UR-0160

• Known to be wrong: disks moved

– Average RotX for ME1/2 from May 2010 Link fit

– Average RotX for ME2,3,4 from Bellinger fits to SLM lines which used May 2010 data and the disk survey positions described above

– Average RotX for ME1/3 from CRAFT09

• Positions entirely PG

• Angles informed by averages from fits

James N. Bellinger 18-June-2010As

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Comparisons/corrections

• Shift was 1.1cm, not 1.1mm for the coded target measurements for ME-4– I find nothing wrong with the derivation of the

chamber centers, starting with UR-0088

– Not much variation chamber to chamber

– Real effect?

• Don’t know if I should adjust the odd-numbered chambers to match

• Difference between Carolli PG centers and mine:– X or Y, RMS 1mm

– Z RMS 3mm, 2mm if omit the ME-4 oddity above

James N. Bellinger 18-June-2010As

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Documents

James N. Bellinger University of Wisconsin-Madison 18-June-2010