CompChannelMasking < TOTEM

TOTEM Web>WebLeftBar>CompOfflineSw>CompChannelMasking (2011-09-12, MarcinBorratynski) (raw view)

---+ Dead and noisy channels masking

---++ General description

There are some channels that don't work properly. Generally we can divide this channels into two groups:
   * dead channels (do not answer)
   * noisy channels (answer to much)

The purpose of dead and noisy channels masking is to exclude both groups of channels from simulation and reconstruction. 

---

---++ Steps that have to be taken
Out of software:
   * retrieve list of dead and noisy channels
   * convert this list to XML file
In Software:
   * parse XML file and create !AnalysisMask
   * use !AnalysisMask in order to exclude channels from simulation and reconstruction

The software part of dead and noisy channels masking takes place during digitalization.

---

---++ Common part for every detectors
---+++parse XML file and create !AnalysisMask
This step of masking takes part directly in software. In order to parse XML and create !AnalysisMask(=TotemCondFormats/DAQInformation/interface/AnalysisMask.h=) we should use !DAQMappingSourceXML class (=TotemCondFormats/DAQInformation/plugins/DAQMappingSourceXML.cc=). To use this class we have to include in our configuration file a special module. We have to also provide mapping files and XML files containing dead & noisy channels. Sample configuration files will be later presented in this document. 

---+++XML file
The XML files which contain dead and noisy channels have very similar format for every detector. The differences are induced by different construction of each detector. Bellow I present sample files.

*Roman Pots*

<verbatim>
<top>	
	<arm id="0">
		<station id="2">
			<rp_detector_set id="5">
				<rp_plane id="0">
					<vfat iid="1" fullmask="yes"/>
					<vfat iid="3" fullmask="no">
						<channel id="51"/>
						<channel id="94"/>
					</vfat>
				</rp_plane>
			</rp_detector_set>
		</station>
	</arm>
</top>	
</verbatim>

*T1*
<verbatim>
<top>
    <t1_detector_set id="100">
        <t1_arm id="0">
            <t1_plane id="1">
                <t1_csc id="2">
                    <t1_channel_type id="1" full_mask="no">
                        <channel id="44"/>
                        <channel id="55"/>
                    </t1_channel_type>
                    <t1_channel_type id="2" full_mask="yes"/>                                  
                    <t1_channel_type id="3" full_mask="no">
                        <channel id="220"/>
                        <channel id="129"/>
                    </t1_channel_type>
                </t1_csc>
            </t1_plane>
        </t1_arm>
    </t1_detector_set>
</top> 
</verbatim>

---+++Configuration file
In reconstruction dead and noisy channels are always excluded. However in simulation it is not necessary, hence a special flag indicating whether we want to simulate dead channels or not was introduced. To simulate dead channels it is necessary to add to a configuration file following part:

<verbatim>
process.load('TotemCondFormats.DAQInformation.DAQMappingSourceXML_cfi')

# mapping files
process.DAQMappingSourceXML.mappingFileNames.append('TotemCondFormats/DAQInformation/data/rp_220.xml') #load all mapping files
process.DAQMappingSourceXML.mappingFileNames.append('TotemCondFormats/DAQInformation/data/rp_147.xml')
process.DAQMappingSourceXML.mappingFileNames.append('TotemCondFormats/DAQInformation/data/t1_all.xml')
process.DAQMappingSourceXML.mappingFileNames.append('TotemCondFormats/DAQInformation/data/t2_4quarters.xml')

# mask files
process.DAQMappingSourceXML.maskFileNames.append('TotemCondFormats/DAQInformation/data/deadChannels_220.xml') #load configuration files
process.DAQMappingSourceXML.maskFileNames.append('TotemCondFormats/DAQInformation/data/deadChannels_147.xml') #for both RP stations
process.DAQMappingSourceXML.maskFileNames.append('PATH_TO_T1_DEAD_CHANNEL_LIST')  #load configuration file for T1

process.T1Digis.simulateDeadChannels = cms.bool(True) #this flag (set to true) indicates that we want to take dead channels into account for T1
process.RPSiDetDigitizer.simulateDeadChannels = cms.bool(True) #this flag (set to true) indicates that we want to take 
                                                               #into account dead channels for RP
</verbatim>

---

---++ Sections for each detector
   * *[[CompRPDeadChannels][Roman Pots]]*
   * *[[CompT1DeadChannels][T1]]*

---
-- Main.MarcinBorratynski - 08-Sep-2011

-- Main.JakubSmajek - 02-Sep-2011

Topic revision: r8 - 2011-09-12 - MarcinBorratynski

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