J.M. Heuser — CBM Silicon Tracker 1

Johann M. Heuser, GSI Darmstadt

CBM Collaboration Meeting JINR Dubna, 15 October 2008

CBM

Review of the first in-beam test at GSIReview of the first in-beam test at GSI

— with focus on the STS ——

J.M. Heuser — CBM Silicon Tracker 2

Parasitic to the HADES beam time: 8h*) 2.3 GeV proton beam

Location: GSI, Cave C

J.M. Heuser — CBM Silicon Tracker 3

Testbeam SetupTestbeam Setup

design and construction: W. Niebur, GSI

3 CBM experiments (STS, GEM, FPGA + DAQ)1 standalone PANDA experiment (DIRC)

beam diagnostics box

J.M. Heuser — CBM Silicon Tracker 4

Preparation of the beam table – September 2008Preparation of the beam table – September 2008

Mechanics designed and prepared by Wolfgang Niebur et al., GSI

Beam stand (blue structure) and adjustable tables for different test experiments. The STS box will be located in the most upstream position.

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STS Test Setup – "Plan A"STS Test Setup – "Plan A"

CBM01

CBM01B1

CBM01B2

postponed to 2009

reference tracking station

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CBM01B2 test detectors, GSI-CIS 8/2007CBM01B2 test detectors, GSI-CIS 8/20074" wafer, 285 µm Si

CBM01

CBM01B1

CBM01B2

mounted on test boards

first multi-purpose tool for detector tests, 2/2008

32 strips to connector

J.M. Heuser — CBM Silicon Tracker 7

FEB1nxGen rev. B

32 of 64 ch32 of 64 ch

FE

B1n

xGen

r

ev.

B

32 o

f 64

ch

32 o

f 64

ch

ROC

STS Test Setup – "Plan B"STS Test Setup – "Plan B"

pos. signals

neg. signals

32 strips bonded on p-side

32 strips bonded on n-side

overlap area strips p-n side:

1.6 × 1.6 mm2

CBM01

B2

CBM01B2 Test board

J.M. Heuser — CBM Silicon Tracker 8

STS Test Setup STS Test Setup

10 cm

2 stationsmechanical mounting of PCB

plus:

FEBs with cooling body on back-side of n-XYTER chip

10 cm

box

FEB

detector beam

J.M. Heuser — CBM Silicon Tracker 9

Preparation of STS test beam box – September 2008Preparation of STS test beam box – September 2008

Mechanics designed and prepared by Wolfgang Niebur et al., GSI

Al box, 40 cm 40 cm 20 cm. Covers removed. Legs ~ 50 cm high lift the box from a table to the beam line.

Holders of two microstrip detector test boards (10 cm 10 cm) and two front-end boards (one mounted board shown).

rotation w.r.t. beam:

study of cluster size

J.M. Heuser — CBM Silicon Tracker 10

on the beam line:

2 detectors CBM01B2

2 FEB-1nx-gen rev B

2 ROCs

power supplies

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low threshold: noisy

threshold adjusted: no noisy

raising detector bias: more and more hits from 90Sr source

Commissioning with 90Sr β- source: Hits versus time

J.M. Heuser — CBM Silicon Tracker 12

ADC spectra of several channels

J.M. Heuser — CBM Silicon Tracker 13

Masking of noisy channels Masking of noisy channels

Successful test of CBM prototype detector systems at GSI, September 28-30, 2008 14

Double and triple GEM detectors2 Double-sided silicon microstrip detectors

Radiation tolerance studies

Full readout and analysis chain:

Front-end board with self-triggering

n-XYTER chip Readout controllerData Acquisition

System

online

offline

Go4

AnalysisDetector

signals

Successful test of CBM prototype detector systems with self-triggering read-out electronics using proton beams at GSI, September 28-30, 2008

GSI and AGH Krakow VECC Kolkata KIP Heidelberg

Successful test of CBM prototype detector systems at GSI, September 28-30, 2008 15

GSI, Darmstadt, GermanyJINR, Dubna, RussiaKIP, Heidelberg, GermanyVECC, Kolkata, IndiaAGH, Krakow, Poland

90Sr -spectra ...

Detector commissioning:

... in several channels of a silicon microstrip detector

... and in a GEM detector

Operation on the beam line:

Participants:

Beam spot seen on a Beam spot seen on a GEM detector (every GEM detector (every 22ndnd channel read out) channel read out)

Correlation of fired channels in two silicon microstrip detectors

www-cbm.gsi.de

J.M. Heuser — CBM Silicon Tracker 16

J.M. Heuser — CBM Silicon Tracker 17

http://cbm-wiki.gsi.de/cgi-bin/view/Beamtime/BeamTimeGsiSep2008Data

The DataThe Data

... more digging into the data in the following presentation by R. Karabowicz

... first impression by P. Nomokonov

J.M. Heuser — CBM Silicon Tracker 18

Summary:

First system tests of STS: Everything new - Detector, FEE, DAQ

4 detector boards produced from tested CBM01B2 sensors

3 boards passed acceptance test – 1 drew current after wire-bonding

2 detector boards installed in beam. Operation: OK

- about 250 nA current in both detectors @ 50 V bias (900 nA @ 70V)

- few noisy channels – can be masked

A third detector:

- started to draw current beyond 20V bias when connected to FEBs - insight into AC insulation quality of CBM01???

We learned already a lot from the commissioning – and first analysis of data.

Follow-up with a long-term setup of the test system in the lab.

J.M. Heuser — CBM Silicon Tracker 19

Radek Karabowicz, Anton Lymanets, Rafal Lalik, Petr Nomokonov,

Wolfgang Niebur, Johann Heuser

The STS Test Beam Team