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Status of IFR/LST Teststand
Minghui Lu
lum@slac.stanford.edu

University of Oregon

BaBar Collaboration Meeting @ SLAC, 02/21/2004 p.1

Outline
Current Status: Schematic setup Current Status: Online DAQ Current status: Cosmic data analysis Summary and Plans

BaBar Collaboration Meeting @ SLAC, 02/21/2004 p.2

The Schematic Setup

G-LINK

FF R CC O DP M MM ICB 9U DAQ CRATE 6U CRATE test pulse IFB ICC

LV = +5V, -7V

GAS

4 MC#1 RPC MC#2

HV=6900V

1

8

9

21

network

unix

TRIGGER

ROM = Read Out Module FCDM = Fast Contrl Distribution Module FCPM = Fast Contrl Partition Module

ICC = IFR Control Card IFB = IFR FIFO Board ICB = IFR Calibration Board

MC = MiniCrate LV = Low Voltage HV = High Voltage

BaBar Collaboration Meeting @ SLAC, 02/21/2004 p.3

Online DAQ
First Calibration run was taken on Jan.26 First Cosmic run was taken on Jan.28 Trigger delay was set at 10.5 µs 1 dead FEC in layer 3, view y
BaBar Collaboration Meeting @ SLAC, 02/21/2004 p.4

Offline Cosmic Analysis
Built test federation CDB Write Cabling map, geometry file, and alignment file for test stand Load them into test CDB Analyze cosmic data to verify the validity of the test CDB

BaBar Collaboration Meeting @ SLAC, 02/21/2004 p.5

Offline Cosmic Analysis
10,000 events were analyzed Four RPC layers in the stack We only have one group of trigger, i,e, N>1 Any one of the layers can be triggered Scatter plots to show if the hits show up at the expected position Residual plots to show the final alignment

BaBar Collaboration Meeting @ SLAC, 02/21/2004 p.6

Scatter Plot in x View
x extrapolated vs hit
0 -25 -50 -75 -100 -125 -150 -175 -200 -225 -250 -250 0 -25 -50 -75 -100 -125 -150 -175 -200 -225 -250 -250 0 -25 -50 -75 -100 -125 -150 -175 -200 -225 -250 -250 0 -25 -50 -75 -100 -125 -150 -175 -200 -225 -250 -250 cm cm -200 -150 -100 -50 0 cm

-200

-150

-100

-50

layer 1 x
cm

layer 2 x
cm

0 cm

-200

-150

-100

-50

layer 3 x

0 cm

-200

-150

-100

-50

layer 4 x

0 cm

BaBar Collaboration Meeting @ SLAC, 02/21/2004 p.7

Scatter plot in y view
y extrapolated vs hit
0 -20 -40 -60 -80 -100 -120 -140 -160 -180 -200 -200 0 -20 -40 -60 -80 -100 -120 -140 -160 -180 -200 -200 0 -20 -40 -60 -80 -100 -120 -140 -160 -180 -200 -200 0 -20 -40 -60 -80 -100 -120 -140 -160 -180 -200 -200 cm cm -150 -100 -50 0 cm

-150

-100

-50

layer 1 y
cm

layer 2 y
cm

0 cm

-150

-100

-50

layer 3 y

0 cm

-150

-100

-50

layer 4 y

0 cm

BaBar Collaboration Meeting @ SLAC, 02/21/2004 p.8

Some observations
Most hits showed up on the expected positions The hits which are not on the diagonal line may come from events with only two layers having hits layer 2 has more hits because of its shift of about 9cm in the x direction on the layer3, y view, the dead FEC

BaBar Collaboration Meeting @ SLAC, 02/21/2004 p.9

Residuals in x View
x residules
45 40 35 30 25 20 15 10 5 0 -40 -20 0 20 40 cm
ID Entries Mean RMS 103 1509 0.9175 8.227 ID Entries Mean RMS 101 949 0.2687 6.376

80 70 60 50 40 30 20 10 0 -40 -20 0 20

ID Entries Mean RMS

102 1465 -0.2083 12.58

40 cm
ID Entries Mean RMS 104 843 0.5108 8.038

layer 1 resid x
80 70 60 50 40 30 20 10 0 -40 -20 0 20 40

layer 2 resid x
30 25 20 15 10 5 0 -40 -20 0 20 40

layer 3 resid x

cm

layer 4 resid x

cm

BaBar Collaboration Meeting @ SLAC, 02/21/2004 p.10

Residuals in y View
y residules
60 50 40 30 20 10 0 -40 -20 0 20 40 cm
ID Entries Mean RMS 113 1509 1.465 10.28 ID Entries Mean RMS 111 949 1.584 5.067

140 120 100 80 60 40 20 0 -40 -20 0 20

ID Entries Mean RMS

112 1465 -0.7868 9.677

40 cm
ID Entries Mean RMS 114 843 2.058 4.673

layer 1 resid y
70 60 50 40 30 20 10 0 -40 -20 0 20 40

layer 2 resid y
50 40 30 20 10 0 -40 -20 0 20 40

layer 3 resid y

cm

layer 4 resid y

cm

BaBar Collaboration Meeting @ SLAC, 02/21/2004 p.11

Some observations
The hits are lined up pretty well in all 4 layers More hits in layer 2 due to the offset Big fluctuation in layer 1 and 4 due to limited statistics and not perfect lineup

BaBar Collaboration Meeting @ SLAC, 02/21/2004 p.12

Summary and Plans
Both Online DAQ and Offline Analysis package are working now RPC efficiency study, needs more input from David Lange Repeat the whole procedure to make sure that we can get the consistent results Jan will help do some analysis work Will build LST test CDB with Matteo

BaBar Collaboration Meeting @ SLAC, 02/21/2004 p.13