svt – ittf integration
DESCRIPTION
SVT – ITTF Integration. Congress panel says silicon impants O.K . Tues June 22 1999 ABC news (Analysts say this finding will discourage future lawsuits on such grounds and encourage existing plaintiffs to accept the money already offered. ). SVT details. - PowerPoint PPT PresentationTRANSCRIPT
March 2002
SVT – ITTF Integration
Congress panel says silicon impants O.K.
Tues June 22 1999 ABC news(Analysts say this finding will discourage future lawsuits on such grounds and encourage existing plaintiffs to accept the money already offered. )
Helen Caines
ITTF Integration Meeting - March 2002
SVT details
Radii – 5,10 15 cm
Length ±12.4 cm
± 18.6 cm
± 21.7cm
(-1 < < 1)
Radiation Length 1.5%/layer (including Electronics+Cooling)
216 wafers on 36 Ladders
0.7m2 Silicon
Helen Caines
ITTF Integration Meeting - March 2002
Cluster Finding
“Raw” Data:
Colour coding is ADC value
Clusters:
Colour coding is cluster number
Helen Caines
ITTF Integration Meeting - March 2002
Deconvoluting
If peak to valley ratio is > 50% considers it has found a new cluster. The fitting is via moments analysis
De-convolutor forms two hits with peaks put where green dots are.
Errors on hits scaled to reflect the separation of the hits.
Larger the peak-to-valley ratio the smaller the errors
0 0 0 0 0 0 0 0
0 0 0 0 1 1 2 0
0 0 0 0 4 2 2 0
0 0 0 0 6 21 14 0
0 0 2 1 23 39 17 0
0 2 2 2 3 14 7 0
0 2 21 18 2 0 -4 0
0 12 36 39 6 0 0 0
0 2 9 11 -1 0 0 0
0 -3 -4 -4 0 0 0 0
0 0 0 0 0 0 0 0
Helen Caines
ITTF Integration Meeting - March 2002
The SVT Coordinate Systems
3 coordinate frames:
Wafer : layer, ladder, wafer, hybrid,timebucket, anodeLocal : layer, ladder, wafer, cm from center of WAFER
in OUR x (drift) and y (anode) framesGlobal : x, y, z in STAR magnet system
anode
anode
timebucket
timebucket
x
y
Helen Caines
ITTF Integration Meeting - March 2002
Conversion to StHit
class StSvtAnalysedHybridClusters : public StSvtHybridObject{
public:
StSvtAnalysedHybridClusters(int barrel, int ladder, int wafer, int hybrid);
virtual ~StSvtAnalysedHybridClusters();
void setMembers(int numOfClu, int index);
int setSvtHit(StSvtAnalysis* mSvtAnalysis, float T0Jitter);
int setSvtHit(scs_spt_st* mSrsHit);
StSvtHitData* svtHitData();
StSvtHit* svtHit();
void ReSize();
int numOfHits();
StThreeVector<double>* WaferPosition();
………
};
Pretty much done
Helen Caines
ITTF Integration Meeting - March 2002
Principle of Operation
SDD gives unique position in X-Y
* 6.3 cm x 6.3 cm area
* 280 m thick n-type Si wafer
* 20 m position resolution
Ionizing particle
X-position from drift time
Electron cloud
X
SDD
Y-position from readout anode number