26.5.2008 Panja Luukka 1

Silicon beam telescope (SiBT) and MCz detectors: status and plans for 2008

Erkki Anttila, Sandor Czellar, Jaakko Härkönen, Matti Kortelainen, Tapio Lampén, Panja Luukka, Maria Maksimow, Henri Moilanen, Teppo Mäenpää, Eija Tuominen, Jorma Tuominiemi, Esa Tuovinen,

Heikki Viljanen (Helsinki Institute of Physics) .

Leonard Spiegel (FNAL) .

Tobias Barvich, Alexander Dierlamm, Martin Frey, Alexander Furgeri, Frank Hartmann, Maike Neuland,

Hans-Jürgen Simonis, Pia Steck (Universität Karlsruhe) .

Bernard De Callatay, Thomas Keutgen, Vincent Lemaitre, Otilia Militaru, (Université  Catholique de Louvain)

. Alexander Kaminskiy, Dario Bisello (Università di Padova)

. Burt Betchart, Regina Demina, Yuri Gotra,

Doug Orbaker, Sergey Korjenevski (University of Rochester)

26.5.2008 Panja Luukka 2

Telescope setup

The telescope reference planes + detectors under test are housed inside so-called Vienna box.

The temperature can be set down to -20°C

Reference planes are installed to ±45 degrees (due to the height limitation)

Reference detectors D0 Run IIb HPK sensors with:60 micron pitchintermediate stripssize 4 cm x 9 cm639 channels

Readout electronics: CMS 6-APV chip Tracker Outer Barrel hybrids (5 chips bonded)

DAQ software: a modified version of CMS Tracker XDAQ rc1205

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P1

P2

P3

Q1

Q2

Q3

Peltier1

Peltier2

Peltier3

Cold plate

H & T Monitoring

Temp.Control

PowerSupplies

HT

Q4

Multi I/OBoard

PC

External cold finger

In addition to the large cold box (Vienna box), in summer 2008 the setup will also contain an external cold finger, which can be cooled down to -50 °C.

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Improvements compared to the 2007 setup

Temperature sensors on the backside of the detectors under test More efficient cooling system:

Use of chiller for removing heat from the cooling box Peltier elements

The top and bottom Peltier units of the cooling box will be replaced

The bottom unit failed during the second beam test last summer, and changing both units will improve the reliability of the system

Slow control in linux temperature, humidity, voltage, current etc. values will be

logged automatically during different runs (pedestal, physics) New scintillators that match the telecope active area better than

the scintillators used in 2007. Feedback from offline analysis already during the beam test

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MCz + Fz detectors for summer 2008 Detector processing was done at the clean room of

Helsinki University of Technology (TKK) Micro and Nanofabrication Centre (MINFAB)

Materials: n-type Magnetic Czochralski (Okmetic) and Float Zone (Topsil; RD50 common order) silicon wafers

Pitch 50 µm 768 strips per detector (=6*128) Suitable for CMS 6-APV hybrid In addition, ministrips and diodes from the

same wafers.

Measured detector characteristics: MCz Vfd ~350 V Fz Vfdl < 10 V

Pitch adapters also processed in MINFAB glass material with Cr-Al metallization

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2008 detector irradiations

Protons at Karlsruhe

Neutrons at Louvain-la-Neuve

The neutron irradiation plan completed

The proton irradiation plan for first four MCz fluences completed

Irradiation plan for large MCz and Fz sensors  

Material Fluence n/p mix %

MCz 5.00E+14 20/80

MCz 8.00E+14  12/88

MCz 1.00E+15  10/90

MCz 2.00E+15  0/100

MCz 3.00E+15  0/100

MCz 3.00E+15  0/100

MCz non-irradiated  

MCz non-irradiated  

Fz 1.00E+14 100/0

Fz 1.00E+14 0/100

Fz 5.00E+14 20/80

Fz 5.00E+14 0/100

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Status Neutron irradiations for large sensors completed Proton irradiations will be completed in the close

future After the detectors have cooled down from the

irradiation, they will be characterized and built into modules.

All modules should be ready by the end of June. The beam test is scheduled for 10-23.7 at CERN

H2 beam area Beam test installations at H2 can start 7.7.

during the long SPS machine development period (3 days)