CMS pixel telescope at MTEST

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A. Kumar, S. Kwan, A. Prosser, R. Rivera, M. Turqueti, L. Uplegger

In the past months, the Detector Instrumentation Group (DIG) of Computing Division has been working at the construction of a pixel telescope for the MTEST facility.Since the CMS pixel community is already working at the phase 1 upgrade of the CMS detector, it was natural to unify the effort and provide a pixel facility for MTESTto test future detector prototypes.

The idea was to build a telescope made of grade B modules rejected during the CMS pixel production. The modules we are using didn’t pass the High Voltage requirements of the LHChigh radiation environment but, for testbeam purposes, they works very well.

There was a free time slot before the shutdown and so we saw it as a good chance toto do a proof of concept building the telescope and testing one of the detector candidates for upgrade.

Motivations

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TELESCOPE ENCLOSURE

BEAM

FERMILAB NETWORK

CONTROL ROOM

Testbeam schematic diagram

DETECTOR

UNDER TEST TELESCOPE PLANESSCINTILLATORS

3.3V POWER SUPPLY

ACCELERATOR CLOCK

CLOCK AND TRIGGER

DISTRIBUTION

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The PSI46 pixel planes

• Pixel size 100x150 um2.

• Analog output digitized by DAQ ADC (12 bits).

• Estimated resolution at the test beam with 4 planes (22 degrees) and 12 bits ADC is in between 3-4 um.

2cm4cm

Multichip module

We used 2 different kind of modules made of 6 (2x3) and 8 (2x4) readout chips (ROCs).The overlap area between modules is about 2x2 cm2

No cooling required! The heat is dissipated on the carbon fiber

The CAPTAN DAQ system has been developed by the DIG (Detector Instrumentation Group) of CD. There are 3 basic concepts behind the system:

2)A set of core boards:

1)Vertical standard bus

NPCB – Node Processing and Control Board

DCB – Data Conversion Board

3)Horizontal connectivity Gigabit Ethernet Link Interface Boards Level Translator USB

The CAPTAN DAQ system

The software is a multithreaded application running on Windows also developed by the computing division DIG group 5

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Fully assembled plane

CAPTAN DAQ board

2x3 Module 2x4 Module

• The 2x3 modules are oriented with the short pixel size measuring the Y coordinate• The 2x4 modules are oriented with the short pixel size measuring the X coordinate

The mechanics were designed by CM Lei and the modules were assembled by Bert Gonzalesat SiDet.

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The diamond detectorThe detector covers just a small part of the readout chip which is a PSI46.It is a single crystal with cell size of 150x100 um2

Active Area

The detector was borrowed from Rutgers University which has been testing it for the PLT (pixel luminosity telescope) for CMS.

Setup at MTEST

Diamond detector

Telescope

Beam

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Beamspot

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Diamond Detector

Coincidences

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Diamond Detector

3D view

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Plans

• Data analysis is ongoing and soon we will have the results of the performance of the diamond detector.

• The analysis software which is currently under development will be part of the testbeam package

• To achieve a better tracking we will expand the telescope adding 2 more stations • We are also building a new modular mechanical box that will host the detectors and electronics

• When new prototypes will be available in the next months we will test them first and then we’ll irradiate and test them again to see if they meet the requirements for the SLHC upgrade

• Many Universities are interested in joining this effort since the system is flexible enough to easily test different kind of detectors

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