FoCal High granularity

R&DElena Rocco

NIKHEF – UTRECHT UNIVERSITY

CERN – ALICE WEEK, MARCH 2014

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CERN TEST BEAMS 2014 WITH FOCAL PROTOTYPE

(LOW+HIGH LAYER GRANULARITY)We asked for 2 test beam periods:

1. PS: 2 weeks at T9 (mixed beams: e-, π) in September;

2. SPS: 1 week at H6 (high energy electron beam; mixed beams) in December.

PS-SPS schedule (preliminary)https://sps-schedule.web.cern.ch/sps-schedule/

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FOCAL PRESENTATION & PUBLICATIONS 2014

Incoming conferences (up to now):- Quark Matter: poster accepted- TIPP2014: accepted contribution (speaker: T.

Chujo)- ICHEP 2014: contribution to be submitted

(spekear E. Rocco)- ….Past conferences:- ICTR-PHE 2014: poster (authors: D. Aadnevik, E. Rocco)(proton therapy)

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HIGH GRANULARITY PROTOTYPE

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UTRECHT CURRENT ACTIVITIES1.Data analysis and simulations ongoing on the previous data set (2012 PS &SPS data) -> problems on chips calibration

• calibration using clustersize for pion tracks• charge diffusion implementation

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UTRECHT ACTIVITIES:

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ER= 5,2%ER= 6,2%

A factor of 2 of difference

simulation

data

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UTRECHT ACTIVITIES:2. Continuously data taking with cosmic data:

- noise calibration (done!)- noise time stability- complementing the info of the prototype for different threshold settings

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to

Cosmic data before “calibration” Cosmic data after “calibration”

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UTRECHT ACTIVITIES:

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Uniformity within the layer, missing channels

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UTRECHT ACTIVITIES:

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What about the cluster size for tracks?

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UTRECHT ACTIVITIES: 3. Alignment is important to properly estimate the shower shape (lateral)

March 26, 2014~40 μm spatial resolution, but it is just first iteration

Before alignment

After alignment

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TEST BEAM AT DESY – FEBRUARY 2014Parasitic beam users, nevertheless in 1 week of data taking (mostly night shifts) we collected enough statistics for the following energies:- 2, 3, 4, 5(just few runs) and 5,4 GeV- At 2 GeV 3 different threshold settings (low, standard,

high)

Participants: Bergen group: S. Yang, D. Joshi, D. AadnevikUtrecht group: G-J Nooren , T. Van Brink, M. Reicher, C. Zhang, H. Wand, M. Dietze, M. Mohammadi, E. Rocco.

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SOME SHOWER EXAMPLES AT 5.4 GeVFront view

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SOME SHOWER EXAMPLES AT 5.4 GeV

Side view

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HITS DISTRIBUTION SCAN IN ENERGY

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LONGITUDINAL PROFILE (2 VS 5.4 GEV)

Still problems with missing channels/chips

Layer 5 (missing channels)

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VERY CLOSE LOOK TO THE SHOWER

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CONCLUSIONSFoCal prototype will be tested at CERN at PS and SPS.

Current activities on the digital prototype:• The digital prototype has been tested at DESY with new

chip settings and preliminary results show improved performance (ongoing analysis).

• Analyses of the previous data: ongoing• Chip software alignment procedure: ongoing • Simulations studies: ongoing

Future activity:Test beam at CERN at the SPS

Presentation of the FoCal performance at several conferences

March 26, 2014