The ATLAS SemiConductor Tracker

scacchicgardenSoftware and s/w Development

Dec 13, 2013 (3 years and 6 months ago)

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1

The ATLAS
S
emiConductor Tracker
commissioning at SR1


APS and JPS joint conference

October 30, 2006


Ryuichi Takashima

Kyoto Univ. of Education


For the Atlas SCT collaboration



SR1

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Calorimeter (

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)

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id, energy, E
T
miss

A

T
oroidal
L
HC
A
pparatu
S

(
ATLAS
)

Muon Spectrometer(

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)

MDT/CSC, RPC/TGC

air
-
core toroidal magnet



Bdl =
2~6Tm

(
4~8Tm
)

Inner Tracking (

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Pixel, Silicon Strip, TRT

2T solenoid magnet

good
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id,
t/
b
-
tag

3

SCT Barrel 4 layers, 2112 modules

Binary read out via opt fiber, work independently



SCT Endcap A,C 9 disks, 1976 modules

1492mm

4

The SCT Barrel module



Survive through direct


irradiation by primary proton beam

Operational until 4X10
14
protons/cm
2
.


deep submicron technology gives


the radhard feature to the ABCD3T chip.



remarkable precision < 5
m
m

by exquisite construction

procedure.


Channel by channel
adjustment of threshold to give
uniform response to signal.


Two readout links can bypass
through a dead chip.



Chips generates ~6W.

Elaborate thermal

property design needed.


Carbon has good

thermal conductivity.


Strip pitch:80
m
m

Stereo Angle:40mrad


5

Goals of SR1 Commissioning


Detector Operation & Commissioning of System:


Gain experience with detector operation


Test combined detector supply systems


Development of standalone & combined monitoring tools


Commission and test combined readout and trigger


Commission offline SW chain with real data



The detector performance aspects:


TRT performance with SCT inserted and powered


Test 4 SCT barrels together and operation with TRT


Checks of grounding for SCT and TRT


Test synchronous operation and check for X
-
talk and noise


Collect cosmics for efficiency, alignment & tracking studies

6

Assembly at Oxford


7

Barrel 3 insertion into Barrel 4,5,6 and thermal enclosure



8

Barrel SCT insertion into barrel TRT


9

Individual test at SR1 for barrel 3 through 5


defective channels 0.3%

expected electron number


for 285mm Si ~20000=3.2fC

10

Detector Tests


Detector performance checks


Standalone calibration tests on SCT and TRT after insertion


Noise studies on SCT and TRT before installation in the pit


Physics
-
mode running with common readout and trigger for SCT and
TRT


Synchronous readout of 4 SCT barrels and SCT+TRT


Noise on SCT from TRT + Noise on TRT from SCT


Test with heater system


Feedback of readout cycle to FE noise


Studies with cosmics currently ongoing


Track Reconstruction


First look at efficiencies in SCT and TRT


Residuals


Detector alignment and test/tuning of different alignment
methods


Analysis of data is on
-
going, so please consider the
following slides as preliminary results


11

Cosmics


First cosmics very helpful in commissioning the
online and offline SW chain


Combined DAQ, DCS and LTP trigger + TOF of Scintillator


Configuration, data handling, mapping, BS converter,
monitoring and event display


Software frame work is different. Offline uses Athena. Online
uses Scram.


Data base shifted to COOL which interfaces to Oracle,
MySQL and sqlite.



Preliminary results from the cosmic data taking and
analysis ….(talk by Y. Nagai)


Run at nominal thresholds (1fC SCT)


Collected 0.5M cosmic triggers


~70% with good tracks


12

Barrel Configuration in SR1 Test

View from outside
towards Side A


SCT:


468 of 2112 modules ~
1/4 of SCT barrel


Keep detector dry
using dry air to thermal
enclosure


Readout using 12
ROD +1 TIM+1LTP



TRT


2x ~6600 Channels ~
1/8 of TRT barrel


Readout in 9 ROD


Note: usually no
electronics on bottom
-
Z sector


3 scintillators for trigger


13

Alignment using
Cosmic tracks

red dots
: space poits,
orange dots
: cluster hits

Residual without alignment

14

Robust pattern
recognition even
in tripled noise
condition.


Noise counts
tripled in expand
mode on the ROD
and hit mode on
the chip.


Very few fake
space points


V pattern of SPs in
pseudo
-
f
-


plane
gives track
params.


Minimize the sum
of residulals on
the surface of
wafers.

15

Noise Occupancy at SR1 compatible with production

<NO> = 4.5 x 10
-
5

Noise Occupancy at 1fC threshold

Module production

(NO specs: < 5 x 10
-
4)

run3065

side0

side1

Barrel 3

4.87

4.94

Barrel 4

4.36

4.91

Barrel 5

4.26

4.89

Barrel 6

4.90

4.75

1fC Noise run at SR1(Offline Monitor)

x 10
-
5

run3065,black,500Hz

run3066,
red
,5kHz

run3067,
blue
,50kHz


Chip NO. No trigger rate dependence

16

ENC = 1605 electrons


ENC can be derived


fitting a plot of occupancy vs


threshold using error function.


Offline value matched with


production.


Noise runs changing threshold


Equivalent Noise Charge


is very sensitive to


the threshold setting.


~ 1600 e
-

ENC at 30C


hybrid temperature


reduces at final operation


temperature by ~ 5e
-
/C * 30C



Number of chips

17

Quiet, Stable, Respond properly

Noise run of 1.0 fC threshold

Typical Cosmic
-
ray run

Nhit (Number of hits /event)

Nhit (Number of hits /event)

Cut Nhit < 200

Perfect Gaussian!


Longest 30kHz noise run of 10M


event observed no spike



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Summary


SCT and TRT barrel tested for 3 months in SR1 with 1/4 of SCT and
1/8 of TRT connected


Gained a lot of experience on detector operation



Noise studies


Have not observed any cross talk between SCT and TRT


Noise on SCT well below specs


No evidence of significant noise increase in SCT with all 4 barrels together
and inside TRT during tests



Cosmic runs


Tracked cosmics through both barrels!


First efficiency and noise
-
hit studies confirm expected detector performance


Alignment work is going on.


Threshold can be checked by noise. But no experience of extra noise.


Cosmic trigger at the PIT expected to be ~0.03Hz. So SR1 cosmic data
are very important.


2 chips out of 5832 was not functional.


Learned much SCT jargon.



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