status of the siw-ecal prototypepolyboudry/siw-ecal/2016-03-07_status_ild_siw_ec… ·...

CALICE meetingKyushu Universty

07/03/2016

Status of the SiW-ECAL prototype

Vincent BoudryÉcole polytechnique, Palaiseau

TNA support + WP14

[email protected] Title | Meeting, Place | Date 2/28

Analyses from 2015 BT

Preparation of 2016 BT– Long Term Plans

ILD Studies– Thermal studies

– SK2A

– Long SLAB tests

mailto:[email protected]

[email protected] Joint CALICE-HGCal TB | HGC testbeam meeting | 22/07/2015 3/28

Beam test at CERN nov 20152–16th of november



Side running

Paolo Meridiani (Milano):

test of prototype MicroChannel Plateswith MgO coating in a small vacuum chamber

Since 11th November

HI muon beam

Taikan Suehara(Kyushu U., CALICE)

Test of alternativeGuard Ring designon babywafers(3×3cm²)

Noise pbms

HI muons beam



Running conditions

4 layers ready for TB on test plates and put in the setup, the last layer was not operational (faulty HV) and wasnot used.

– Position of layers: beam → DIF1, DIF2, DIF0

– Each layer had 4 x 256 pixels / channels.

– All layers were always power pulsed.

Spills: Several settings tried,

– mainly long spills (eg. 200 + 50 msec = data taking + readout/dead time) to increase statistics with SPS spills of afew seconds, so, effectively corresponding to quasi-continuous mode.

– Also, some special runs with short spills 2.5 + 247.5 msec (no BX clock cycling)

DAQ: No problems with configuration of the setup.

High Gain: All data have been taken with feedback C=1.2 pF (nominal value is 6 pF)

– 5 times higher gain and better S/N (unexpected), but lower dynamic range

Selected trigger threshold = 230 after suppression of noisy cells

– much better than in cosmic runs one year ago (~290) but ≥ 220 (used for 2013 cosmic runs PCB (FEV8) ).

– Special runs with a few triggering cells in showers



Very smooth running

DAQ: single crash (due to unchecked scripting)

Many many data taken (but “only” ~85 GB)

– Beam structure + ACQ for ILC (burstsof 50ms × 4Hz)

Muons runs

– Calibation first @ high threshold

– variation of threshold, and angles (49°, 90°)

Electrons of 15, 30, 50, 100, 150 GeV

– with 8.5 X0

– with mini-cal option this WE

Pions of 50 and 150 GeV with 1.75 λ

– Check non un-conventionnal events

Masking : 2.2% of all channels

Muon beam spots (X-Y distribution ofN triggers, requiring ADC-pedestal>10)from typical muon run 361 as example



Analyses

1st : verification of behaviour with simple events

– SK2 response ⇐ was a priority for SK2A prod

– Filtering Noise and establishing clean events

2nd : check of collective response

– Correlation between plates

– Modelling of shower response

• G4 MC being written by A. Psallidas (National Taiwan University, CMS)

Examples given hereanalyses fromV. Balagura, K. Shpak



Triggered Noiseby Vladislav Balagura

Distribution of Number of successive BX by classes (of10) of Max(ADC-pedestal) for All Chips or Single Chips

– ≠ red and blue ⇒ retrigger in common.

• This is the case for peak at zero

Not seen in DIF0 ⇒ thr. lowering limit due to re-triggering.

– even in “clean” DIF0&1: 25% of events have RTfor 50% of SK2 memory

(ADC – pedestal) in DIF 2 and DIF 0 for comparison (DIF 1 is even better), all channels combined,



Threshold level scansby Vladislav Balagura



Threshold level scansby Vladislav Balagura

⇒ efficiency at MPV=60: eff ~ 96%, eff=50% at about 30 ADC counts.



Features of SK2by Vladislav BalaguraRetrigger pattern:

– Chain of re-triggers until Nch=64

• due to global ped. shift resetted ch by ch.until all have triggered (best expl.)

– pedestals shift seen in ADC

Pedestal splitting is channeland layer dependant

Shift doesn’t affect physics signal (mip here)



Square eventsby Kostya ShpakNormal event Shoot @ 90°

4 Sq in 1 event

5 squaresin 4 events

Tools ready for statistical caracterisation



Others (not devoppeled here)

Masking verification: some issues

Data corruption

– in case readout time wasn’t sufficient

• corrected by DAQ settings

Negative signal (ADC=4)

– located near the DIF connectors

Pedestal stability

– Slow drift after power one on longperiod

Splitted and delayed triggers

Chip full events

Un-operationnal chips if SCA=15 in ACQ-1

Pedestal width:

– S(MIP) / RMS(pedestal) =17..18.

• Good even for short spills with “real”power pulsing and drift effects



BT in 2016 and beyond



Beam test in 2016

Real calorimetric tests with 7–12 SLAB’s in coordination with SDHCAL

– 7 ASU ready; production should resume in april

– real SLAB’s (no more test plates) prod (will) start(ed) this month: see Roman’s talk

• improved S/N ratio, robustness

– dependant on beam period (still under discussion)

• eventually could re-use some the CMS time in sept/oct.

Flexible structure to accommodate

– variable number of SLAB’s

– be in “real conditions” for PFA tests:

• 24 X0 of W + 3 cm hgap before SDHCAL



Test of HW: long slab

– Long slabs: what can’t be done with a small RA source ?

– perf in strong B field, with PP.


[email protected]

Test of PFA’s

ECAL standalone

– separation of showers studies (γ’s, e’s) ⇒ tracking in front ?

• e+γ beam (thick target with a magnet in front ~10 m)

ECAL + HCAL

– SW superposition of showers γ/e + h

– Physical superposition of showers (h+γ ?)

Test of PFA in B field

– Tracking, B effect in RPC’s (?)

on mechanics with PP,

– ⇒ Reduction in size of the SHDCAL (last 10 layers) to fit in the M1 magnet in H2B ?

• (~30 cm missing) ?


[email protected]

ILD related studies



Integration in ILD: thermal studiesby Denis GRONDIN / Julien GIRAUD (LPSC)




Heat exchanger assembly15 -SLAB’s in EUDETmodule

Insulation




8 day period

Conclusion:

– Efficiency of ex. isolation ✔

– Thermal test takes time…

Ready for cooling tests...

3 day period

Power without cooling

– P= 15.476 W

Peaks in external temp due to directsunlight


[email protected] ILD SiW-ECAL optiminsation | ILD SW & Optim WS | 25/02/2016 22/28

Simulation modificationsSlide from Sept 2014

Cleaning & adapatation of ECAL Mokka drivers:[D. Jeans + J. Marshall + E. Becheva + V. Boudry + Dan Yu]

– Many cleaning made by D. Jeans ⇒ SECal05

• Bugs, improved GEAR output, handling of pre-shower

– Documentation being reviewed

– TBD: Implementation of SEcal05 in DDHEP (based on S. Lu implementation of SEcal04 + tests)

• Done for CLICdp by D. Protopopescu & M. PetricNeeds to be review / adapted for ILD vs SECal04

New ECAL Driver (SEcal06) to correct defects (mostly in Endcaps).

– Missing dead materials, “corners”

– Consistant treatment of Barrel/Endcaps

– Better handling of Layers, optionnal pre-shower

Status of Sept 2014



Extras



“Final” prototype test (2016+)

Tower of 18×18 cm² (2×2 wafers)14 Short SLABs 1 Long SLAB

2×2.1mm/lay 2×4.2mm/lay


Frotin – CALICE meeting – 17/09/2009

25

The goal:

7.3 – Testing the response of the short SLAB with 4 wafers!

- TB position to be tested- DAC Testing……- and surprises!!!

7-Slab for Test beam 2015

1 Aluminium plate

4 short SLAB

Cover shielding

Windows of 15 mm forW

Cable panel

Led panel position

A word about names

«ILD SiW-ECAL technological prototype»

more of less recently :

– EUDET prototype

– CALICE SiW-ECAL technological prototype

– ILD SiW-ECAL (in conferences)

– SiLC in recent project call in Paris-Saclay

The prototoype is clearly being designed for the ILC, and ILD.

– ≠ from requirements for CLIC-SiW-ECAL, CMS-HGCAL, ATLAS-HGTD, FCC/CEPC

– CALICE is the structure to make this : e.g. recognised for this by CMS (and others)

“A high granularity calorimeter system optimised for the particle flow measurement of multi-jetfinal states at the ILC running, with centre-of-mass energy between 90 GeV and ~1 TeV”

⇒ open it up for other applications ?

[email protected]

Physics program

Physics commissioning:

– Check proper running with high intensity μ’s (X-check of cosmics)

– Thr. adjustment vs noise environment. (Maybe require shielding).

EM-Core Set-up: All slabs after 5 X0 of W → Strong correlation between SLAB’s

– Response at the core of a EM shower:

• Explore the full dynamic range (1–2500 mips) using shower profile (for all mem depth).

– e– runs of all energies, beam rates → linearity

• Check the responses at the wafers edges with ≠ types of wafers (square events)

– Scan in positions

HAD-Core set-up: same as EM-core or with 1λ of W / SS

– Response to HE hadrons: look for SEU

Mini-ECAL set-up: Sampling with 3-4 × 2.5 X0 and 2-3× 5 X0

– Study of theoretical resolution & simulation tuning.

• Scan in energy, position (and angle).

In parasitic mode:test of Babywafers (Kyushu, LLR)


[email protected]

Chip initialissation pbm


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