Vertex Detector: status and plans

Pawel Staszel

NA61/SHINE Collaboration meeting, CERN, 25 September 2014

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VD project structure

Main five pillars of the project: 1. Sensor tests and integration – IKF (Michal, Michael) - not supported yet. Foreseen support from Michael's grant. This is however progressing due to support from NA61/SHINE CF and activity in IKF (MK) 2. Carbon fiber support – St. Petersburg/CERN (Grigory, Sergey) - based on deal with ALICE. The agreement however states, that NA61/SHINE covers costs of material and 1-2 months of manpower at CERN. Not supported yet.Options: St. Petersburg grant, future polish grant.

3. Read-out – Krakow (Pawel, ....) - in progress. We got limited funds from JU which allowed to build a stand-alone system (with significant contribution form IKF: integrated sensors, read-out boards).We are in the phase of customizing the system to NA61/SHINE needs. The next step is test using cosmic muons.Searching for master and PhD students (Applied Computer Science and Computer Physics) to program FPGA. In short term based on synergy with CBM MVD group.

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4. Mechanics, Cooling – vessel, system for internal and external movement, cooling plant, cooling control system (Michal Jablonski, Grigory, Pawel, Tadeusz (cooling control)) - founds will be included in future polish grant. The activity is going on. We will need to find resources for purchasing materials, LTS, cooling plant, flow meter/controller. Other options: St. Petersburg (to be discussed)

5. Software development – Krakow (Dag, Pawel, Yasir) - moving current stand-alone framework into SHINE - developing realistic reconstruction methods → software ready for data reconstruction.

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1. Status of sensor tests and integration

→ next talk by Michal Koziel

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Ultra-light Mechanical Support Structure

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2. Status of carbon fiber support

→ based on Grigory's slides

1. Three thin graphite plates, with high thermal conductivity) were delivered 01.04.2014 to IKF Frankfurt from the ALICE/ITS Collaboration → test of wire bonding of FPCs to the detector chips.

2. The meeting of representatives of the ALICE-ITS and NA61/SHINE-VD groups was held at CERN on March the 6th 2014. The preliminary version of the memorandum on synergy of ALICE-ITS and NA61/SHINE-VD was prepared.

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CF stave –ALICE design

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VD for NA61, news from St.Petersburg

• Report was done at Baldin ISHEPP XXII, JINR, Dubna, September 17, 2014. http://relnp.jinr.ru/ishepp/presentations/Feofilov2.pdf

The report was well received and strong interest was indicated by Dubna people working for the new fixed target experiment BM@N (JINR-GSI collaboration) at the Nuclotron.

• Production at CERN of the Carbon Fiber support structures for NA61 VD is about to start --- the engineer M.Tkachev is hired by the university and he is ready to come to CERN. The final approval for his 2 months visit in 2014 is to be taken jointly by ALICE and NA61 collaborations in near days.

• Technical details of manufacturing of the Carbon Fiber support structures should be checked and discussed by the VD team asap.

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3. Status of VD read-out

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1. The read-out for 2 MIMOSA-26 sensors was setup on July (28-31)

2. Team:

Michal – who brought integrated sensors with Frond-End-Boards (FEBs) and with Converter Board (CB)

Michael Wiebusch – who was working on-line, testing performance of firmware for slow control and readout, setup xml scripts for the setup (Krakow setup).

Jan Michel – consultation regarding the software

Grzegorz Korcyl – helped to setup a local server for communication with TRBv3

Pawel Staszel – who tried to lean as much as possible

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Setup photos

CB

TRBv3

FEB

SensorsLV: +5V

+48V

DC

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Slow/read-out control

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Ethernet

PC

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First measurement1. Sensors were stored in the dark chamber to prevent them for the light (metal box)2. Thresholds have been setup to see roughly same noise occupancy over sensors surface.3. Collimated Sr90 beta source was installed in the box just above the sensors. Results:

Setup 1: source located above sensor2

Setup 2: source located above sensor1

Sensor 1 Sensor 2

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Conclusions:1. slow control is working2. read-out is working

Problems:1. Is current read-out every frame from each sensor is read – no synchronization mechanism implemented yet. 2. Read-out based in HADES Daq system: it uses HADES event builder written in C. We need to replace this event builder with simple program written in C++, so we understand data flow and can customize it to:a) perform synchronization and test it with DCb) perform integration with NA61 Daq.

→ Synchronization can be done in easy way by introducing an extra flag into frame header. It flag will provide information about presence of the external trigger during the frame construction. Trigger signal will be provided to the CB avoiding data latency in TRBv3.

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→ Jan Michel prepared new TRB firmware (not implemented yet).

→ It assumes that the trigger signal (LVTTL33) is provided to connector j6, pin 1 on the CB.

→ Tests using pulse generator foreseen next week

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Test with DC

1. Tracks of cosmic muons are reconstructed in DC (5cm x 5cm). 2. Reconstructed tracks are projected to surface of sensors (known x,y position on sensor surface). 3. If the extrapolated track hit the sensor we should see correlated (in x and y) cluster     → we can study the cluster     → first geometry tuning      → determine efficiency and noise vs threshold      → in the next step we plane to add simple cooling system and study performance at different temperatures.   

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Test with DC

VME-CAEN bridge: USB

TRBv3: Ethernet

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DC performance (one night measurement)

Drift time spectrum

Calibration curves

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DC performance: trigger scintillator QDC

QDC from one scintillator for coincidence events

QDC

co

unt s

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Setup photos

CB

TRBv3

FEB

SensorsLV: +5V

+48V

DC

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4. Status of Mechanics, Cooling

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VD in geant4 (vertical layout)

VTPC1

VTPC2

Vessel:Rectangular left/right platesTrapezoidal top/bottom plates

→ same length of carbon leader→ similar distance between left/right plates and VDS1-VDS4

→ flat micro cables variation in length +/- 4cm

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NA61 Vertex Detector - Conceptual Design (03.2014)

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NA61 Vertex Detector - inner mechanics structure

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M -683 step motorLinear Translation Stage

http://www.physikinstrumente.com/product-detail-page/m-683-1000520.html

● Piezoceramic linear drive with excellent dynamics ● Max. velocity 350 mm/s ● Low profile: only 21 mm ● Travel range 50 mm ● Encoder resolution 0.1 µm ● Vacuum-compatible versions available● Compact XY combination possible● Excellent guiding accuracy due to crossed roller bearings● Self-locking, no heat generation at rest, no servo jitter● Excellent start/stop dynamics● Reference point switch repeatability ±1 µm● Operate reliably in strong magnetic fields

Sent request of price quote to PI and got answer:

Your sales contact is Mr. Michal Aftewicz, mailto:sales@nanor.se , Phone: +48 664 921 922

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Readout system (front-end part) layout, cooling system connections

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First computer drawing by Michal J.

Next VD meeting will be organized on 9-10 Nov. We will discussed mechanics. Foreseen presence of Michal Jablonski!

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5. Status of software

1. Realistic tracking and matching with VTPC (YA, PS).2. Procedure for the VD geometry tuning (PS).

3. Moving the stand alone package to SHINE (Dag Larsen) - VD detector module and VD geant4 model in SHINE – done and tested - work in progress on other modules – first versions in SHINE done before Dag come back to Krakow (in a couple of months).

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Time plane1. Sensor tests and integration: depends on pillar 2: ??? 2. Carbon fiber support:

3. Read-out:→ synchronization implemented, setup test with DC (late November 2014)→ test with DC completed, sensor performance characterized (January 2015)→ Read-out for full start version ready – obtaining more cables and boards from IFK (March 2015). In November we should decide, if we need different lengths of the PFCs.

4. Mechanics, cooling:→ solutions and dimensions fixed (November 2014)→ purchase of needed items (by February 2015 – founds needed)→ technical drawings completed and evaluated (February 2015)→ manufacturing vessel and mechanics elements (JU) (April 2015)→ integration (vessel, mechanics, cooling) (JU) (June 2015)→ test with DC in Krakow (during vacation time 2015) – testing reconstruction procedure., geometry tuning with muons.

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Backup slides

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Some photos

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Time plan1. Proposal submission by June the 17-th (2 years) (done)

2. Funds (if) available late 2013 (in 2-3 weeks)

3. Purchases (M26, LV, Water Cooling Plant, TRB) late 2013 – beginning of 2014

4. Hardware work in parallel:i) carbon fiber support (CERN, Grigory, Sergiey) (Nov 2013 - Feb 2014)

ii) sensors quality checks (IKF Frankfurt, Michael, Michal)

start: when we get sensors (Dec 2013 - need to make final deal with Marc Winter (PS))

iii) integration on support (IKF Frankfurt, Michael, Michal) (Feb-April 2014)

iv) cooling system (Krakow, Pawel, Tadeusz) (Jan-June 2014)

v) adopting read-out to NA61, Grzegorz Korcyl - working with TRBv3 for HADES, Oskar, need someone who will upgrade Na61 Daq) (Jan-June 2014)

5. Integration of the system and tests on cosmics with DC (in Krakow) → will allow for synchronization test (June-Oct 2014)

6. Preparation for test at CERN: Nov 2014, January 2015.

7. Integrated test for Ar+Ca: Feb. 2015

8. 2015 – test data analysis, reco. software development Software developments: move simulation (geant4) and analysis to SHINE (Dag, Pawel, Yasir)