1

Status of NA62

Augusto Ceccucci / CERN

for the NA62 Collaboration

NA62- 3rd FRCCERN, November 29, 2013

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NA62 Physics Goal NA62 aims to measure precisely BR(K+ → p+ n n)

exploiting a novel in-flight technique based on:

1. calorimetry to veto extra particles

2. very light trackers to reconstruct the K+ and the p+ momenta

3. full particle identification State of the art:

729 7.23.32

)CL %90( 260 04.0270

731 070850 )(

Experiment (SM)Theory

)10( Ratio Branching Decay

]6[0

]4[]3[00

]2[151051

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B

.K

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[1] J.Brod, M.Gorbahn, PRD78, arXiv:0805.4119 [2] AGS-E787/E949 PRL101, arXiv:0808.2459  [3] M. Gorbahn, arXiv:0909.2221 [4] KEK-E391a, arXiv:0911.4789v1[5] A.J. Buras et al., EPJ C72, arXiv:1208.0934 [6] CMS PAS BPH-13-007; LHCb-CONF-2013-012

Example: Rare K decay sensitivity to flavor violating Z’

Buras, De Fazio, Girrbach arXiv:

NA62 is timely and important

Gro

ssm

an-N

ir li

mit

Constrained M

FV

Allowed by AGS E949/E787← → Left Handed Z’ large Vub

Left Handed Z’ large Vub

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NA62 Layout: 2012 TR vs. 2014

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NA62 2012 Technical Run

NA62 Experimental Area in late 2012

A lot of progress was made on the infrastructure, services, beam and detector installation for the 2012 Technical Run (TR)

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Analysis of the TR Data Selection of K+ → p+p0 events to:

Assess the performance of beam and detectors Study of the timing correlation between detectors

Analysis selection: Identification of at least two electromagnetic clusters in LKr Reconstruction of the p0 four-momentum imposing the p0

mass constraint Reconstruct the p+ using the p0 information and the K+ four-

momentum as defined by the beam constraint

As a result, K+ → p+p0 events exhibit a peak in the missing mass: 22 )( 0

PPm Kmiss

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NA62 Timing in TR(s CEDAR-LKr)~0.36 ns (s CHOD-CEDAR)~0.41 ns

(s MUV3-CEDAR)~0.46 ns (s MUV2-CEDAR)~3.5 ns

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Missing mass after all cuts

Final selection: Kaon candidate in

KTAG (CEDAR) No in-time muon

4232

422

/108.3)(

)0195.0:(

/ 0005.00199.0

cGeVm

PDG

cGeVm

miss

miss

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KTAG Performance in TR

RMS 280 ps/hit

Green selection: p0 in LKr Blue selection: K+ → p+p0

CEDAR tuned to see Kaons

A few % of non-kaon contamination in the Green selection could be due, for instance,to p0 originating from p+ interactions in the dummy GTK;

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Straw rate vs. beam offset

StrawsInnermost straw

X

Y

Beam

offse

t

Comparison of three conditions:• “Standard”: ~1.7 bar N2 in CEDAR• “Dummy GTK”: “Standard” + 380 mm thick

Si plate crossing the beam at GTK3 position• “Dummy GTK, CEDAR empty”: as above with evacuated CEDAR (to mimic

H2)

Observations:• Si in the beam: overall increase of counting rate• Emptying the CEDAR: Reduction of beam RMS

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NA62 Run in 2014

NA62 Beam Request

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2014 Physics GoalAssumptions:

60 days of data taking 10% of the nominal Intensity x data taking efficiency

𝑵𝑲=𝟎 .𝟎𝟔 ∙𝟒 .𝟓×𝟏𝟎𝟏𝟐=𝟐 .𝟕×𝟏𝟎𝟏𝟏

𝑵 𝝅𝝂𝝂𝒔𝒆𝒍𝒆𝒄𝒕𝒆𝒅=𝑵𝑲 ∙𝑩𝑹 (𝝅𝝂𝝂 ) ∙𝓐𝝅𝝂𝝂=(𝟐 .𝟕×𝟏𝟎𝟏𝟏) ∙ (𝟎 .𝟖×𝟏𝟎−𝟏𝟎) ∙𝟎 .𝟏

 

Aiming to reach the SM sensitivity:May provide a BR measurement competitive with the existing one... ...or find out what is still missing to do so...

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Overall Status GTK: The TDCPix ASIC has been received and testing is about to

start. Flip-chip bonding has been adjudicated to IZM Berlin and dummy assemblies are in preparation. Prototypes of Si-Si micro-channel cooling are in hands. Tender for the cooling plant in preparation

Straw Tracker: Five out of eight modules are glued and wired. The first complete JINR module has arrived at CERN successfully. All needed straws have been produced in Dubna. All the Front–End electronics will be delivered by the end of 2013. Design of the final SRB has started (critical element)

RICH: Minor delays in the procurement of the RICH vessel (delivery now scheduled for January 2014). The fabrication of the mirror support panel as well as the design work for the mirror mounts are on the critical path

Photon Veto: A1-A9 are installed, A10-A11 are ready to be installed, A12 (which is not in the vacuum tank) is completely designed

LKr / CREAM readout: The preproduction is being validated. Production modules (14 k channels) expected by mid 2014. the delivery schedule is on the critical path.

MUV: The delay of the delivery of MUV1 has implications on the installation

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Gigatracker ASIC (TDCPix)

The wafers with TDCPix ASICs were delivered in October 2013 IBM CMOS, 130 nm technology

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GTK TDCPix ASIC

Note the End of Column logic on the RHS

1800 pixels / chip

10 chips / station

3 stations

Pixel matrix

(one chip)

Photo Credits: A. Kluge/M. Morel

~1

2 m

m

Detail

~20 mm

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GTK: micro channel cooling

Baseline design: 150 parallel cooling channels

(200 mm × 70 mm, C6F14) Prototypes have been

produced and tested under realistic conditions

Preproduction runs of Si-Si bonded devices with IceMOS and CEA-LETI

Tender for cooling plant underway

Courtesy of A. Mapelli

Not to scale!

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Status of Straws Construction (13/11/2014)

Module Straws Wiring Webs Front-end Covers

1 50%

2 15.01.2014

3 15.02.2014

4 15.02.2014

5 15.02.2014

6 50% 50% 15.02.2014

7 01.02.2014 01.04.2014 01.04.2014 15.05.2014

8 01.04.2014 01.05.2014 01.05.2014 15.05.2014

By Hans Danielsson

Wiring of Module 6

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Straws Module 3: from Dubna to CERN!

Module 3 built in JINR Dubna… …and now at CERN!

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Straw Front-End

One view of Module 1 fully equipped

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LAV: Completion of A10

Last -sector installed on 19 September, congratulations to INFN!

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LAV: A12 Design completed

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MUV1 Construction in

Mainz

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MUV2 and MUV3 in TR

MUV3 MUV2

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NA62 TDAQ

Successful deployment of NA62 TDAQ equipment in ECN3

TDCB finalized: 15 boards used in dry/ technical run

TEL62: DDR2 dynamic memory for data storage validated

15 TEL62 deployed Issues with crates being fixed

TEL62 and TDCB

TEL62 crate ready for data taking

LKR CREAM preproduction

Delivery by CAEN of 440 production modules by mid 2014 Contract No. F599/PH

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Channel Rej factor

Rate (KHz)

p+p0 77 28.5

p+p+p- 24 24.3

p+p0p0 272 0.7

m+n 2.3 × 103

2.9

p0e+n 54 10

p0m+n 44 8

Beam p+

1.2 × 104

43

Beam p

5.5 × 104

3.2

Total 120.5

Expected Level 0 Trigger Rate

Signal efficiency ~85%

Nominal Intensity, no pile-up

G. Ruggiero

NA62 Schedule

Schedule by F. Hahn

NA62 Schedule

Schedule by F. Hahn

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Summary We have learned a lot from the experience

of the Technical Run in 2012 We have ten very busy months in front of

us to be ready for the 2014 run We are grateful for the proactive

commitment of the Funding Agencies The NA62 Collaboration wishes to

acknowledge the invaluable support provided by the Support, Technical and Administrative teams of CERN and the Collaborating Institutes