HCAL Alignment

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This twiki topic explains how to upload the HCAL alignment constants to CondDB.

The steps:

1. prepare the constants in text files

Here need to explain how DetId works.

For example,
https://github.com/cms-sw/cmssw/blob/CMSSW_7_6_X/Geometry/CaloEventSetup/plugins/FakeCaloAlignmentEP.cc#L197-L200 i runs from 0 to HcalGeometry::numberOfEndcapAlignments().
Then i is converted to HcalDetId by HcalGeometry::detIdFromEndcapAlignmentIndex():
https://github.com/cms-sw/cmssw/blob/CMSSW_7_6_X/Geometry/HcalTowerAlgo/src/HcalGeometry.cc

HcalDetId is a subclass of DetId
https://github.com/cms-sw/cmssw/blob/CMSSW_7_6_X/DataFormats/HcalDetId/interface/HcalDetId.h

https://github.com/cms-sw/cmssw/blob/CMSSW_7_6_X/DataFormats/DetId/interface/DetId.h DetID is internally merely a uint32_t and can be converted to a uint32_t.

AlignTransform is defined at:
https://github.com/cms-sw/cmssw/blob/CMSSW_7_6_X/CondFormats/Alignment/interface/AlignTransform.h It has three members: translation, euler angles, and an id. The id is align::ID, which is just a uint32_t at
: https://github.com/cms-sw/cmssw/blob/CMSSW_7_6_X/CondFormats/Alignment/interface/Definitions.h



2. convert them to sqlite



3. upload to dropbox



Responsible: TaiSakuma

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Topic revision: r3 - 2016-02-25 - TaiSakuma
 
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