Readout electronics development for CDC in …osksn2.hep.sci.osaka-u.ac.jp/~s-ono/slides/Nakazawa.pdfReadout electronics development for CDC in COMET Phase-I Nakazawa Yu Kuno-g 2015.12.25

Readout electronics development for CDC in COMET Phase-I

Nakazawa Yu Kuno-g

2015.12.25

Year-end joint session 2015 1

Outline• Introduction

• COMET Phase-I • Cylindrical Drift Chamber (CDC) • Readout board (RECBE)

• Neutron irradiation test @Kobe Univ. • Motivation • Radiation setup • Result

• Issue • Strategy

• Summary

2Year-end joint session 2015

Introduction


COMET Phase-I

Purpose : Search for the charged Lepton Flavor Violation • The neutrinoless, coherent transition of muon to electron @J-PARC in 2018 • B.R.(µ -> eγ) ~ O(10-54 ) @SM extended neutrino oscillation • S.E.S. ~ 3 × 10-15 in the COMET Phase-I

Detector : Cylindrical Drift Chamber (CDC) & Straw Tube Tracker

Signal : ~105 MeV/c mono-energetic electron for an aluminum target

Background : Decay-In-Orbit electron & Beam related BG


CDC A. Wire

• Sense : ø25 um W plated Au • Field : ø126 um Al

B. Gas : Helium base (not yet decided) C. Momentum resolution : 200 keV/c D. Readout System : 104 RECBE boards

• Mass-production was completed at IHEP in China

SignalDIO

Momentum Spectrum expected in the Phase-I

Muonic Atom • Unstable atom capturing a muon in electron orbit.

• Decay In Orbit (DIO) : µ -> eνµνe

-> Background

Cylindrical Drift Chamber 5Year-end joint session 2015

Readout Board

8ch/chip

8ch/chip

Remodel the RECBE developed for Belle-II 1. Aurora：remove　 2. Rewrite the firmware 3. System Clock：128MHz → 120MHz


Development items 1. Data reduction

• Throw away the BG data

2. Irradiation tolerance • gamma ray • neutron

Evaluation items 1. Noise level 2. Gain linearity (Analog out of ASD) 3. Threshold scan (Digital out of ASD) 4. Time resolution 5. Cross talk 6. TRG rate tolerance 7. Temperature vs Power

This talk

Virtex-5 XC5VLX155T

Neutron irradiation test @Kobe Univ.


htempEntries 24524Mean 15.12RMS 23.22

EvtP4[3]0 50 100 150 200 250 300 350 400

1

10

210

310

410

htempEntries 24524Mean 15.12RMS 23.22

EvtP4[3]

Motivation• Virtex-5 is exposed to a high neutron flux of >1012

neutrons/cm2. (ref. Ye-san’s simulation：28aSN-2) - RECBEs are set at the CDC endplate at the downstream side.

• It is known that a firmware is broken by neutrons. So we need re-download the one at intervals. - Single Event Upset：SEU

We want to check whether this problem of SEU is serious or not.

RECBE

• As a result of nuclear reaction with a neutron and semiconductor atom, a charged particle or an ion is generated.

• These charged particle create electron-hole pairs with drifting.

• These charge invert logic in the FPGA

What is SEU?

Problem in the COMET Phase-I

Energy spectrum of neutrons

MeV

beam


評価項目 1. Frequency of SEU occurrence

• Download the firmware with the iMPACT（Xilinx Inc.）and a JTAG cable. • Compare a bit stream on the FPGA to a original firmware with using the function of “Verify” in the iMPACT.

• Due to the comparison, count the number of SEUs.

2. A neutron incident angle effect on SEU rate. (θ=0º and 180º)

Radiation setupBeam : ~3 MeV Deuteron Target : Be Intensity : (1.90 ± 0.13) × 106 neutrons/cm2

( Distance from target : 10 cm ) ( Beam current : 1 microC/s )

TANDEM @Kobe Univ.

Definition of angle

ref : http://iopscience.iop.org/article/10.1088/1748-0221/7/02/C02022/pdf

Neutron Energy Spectrum at TANDEM

ref：Neutrons from Thick Target Beryllium Reactions at 1.0 MeV to 3.0

MeV (Tetsuo INADA, 1968)

~2 MeV

En [MeV] Evaluation items

TANDEM

中性子ビームライン


ref. Nakanishi Hitoshi (Univ. of Tokyo) JPS 2015 autumn

http://iopscience.iop.org/article/10.1088/1748-0221/7/02/C02022/pdf

Setup

Neutron

RECBE

(Radially from target)

Be Target

Deuteron

(✳) In this test, we assumed the uniform beam at Virtex-5


Date and Time07.28 09:00 07.28 21:00 07.29 09:00 07.29 21:00 07.30 09:00 07.30 21:00 07.31 09:00 07.31 21:00 08.01 09:00 08.01 21:00 08.02 09:00 08.02 21:00

Neu

trons

/ SE

U

100

150

200

250

300

350610×

Rate

Neu

tron

s/SE

U

Date and Time

Neutrons/SEU

(✳) Divide a long run into every ~2000sec during measurement.Run1

Start 7/28 8:20Stop 8/2 10:30

Total time 211621 secDistance 285 mmAngle 180 º

Neutrons 9.25×1011

SEUs 4934

(1.82 ± 0.03) × 108 Rate-1 (neutrons/SEU/Virtex-5)

(✳) Error is statistical error given by the standard deviation. (✳) Rate is estimated by fitting this graph.

Result : SEU rate at 180º 11

Date and Time08.03 21:00 08.04 03:00 08.04 09:00 08.04 15:00 08.04 21:00 08.05 03:00 08.05 09:00 08.05 15:00 08.05 21:00 08.06 03:00

Neu

trons

/ SE

U

0

200

400

600

800

1000

1200

1400

1600610×

Rate

Run3 Run4 Run5Start 8/3 23:38 8/5 1:46 8/6 1:23Stop 8/4 8:31 8/5 9:34 8/6 9:13

Total Time 29933 sec 27020 sec 11438 secDirection 275 mm 285 mm 285 mmAngle 0 º 0 º 0 º

Neutrons 2.22×1010 5.25×1010 7.65×109

SEUs 59 129 23

(3.16 ± 0.23) × 108 Rate-1 (neutrons/SEU/Virtex-5)

(✳) Error is statistical error given by the standard deviation. (✳) Rate is estimated by fitting this graph.

Neu

tron

s/SE

U

Date and Time

Neutrons/SEU

(✳) Divide three runs into every ~2000sec during measurement.

Result : SEU rate at 0º

17th COMET Collaboration Meeting (LPNHE Paris)


Issue


Issue

ref. Abe Shinichiro (Kyushu Univ.)61st JSAP meeting

Estimated SEU rate-1 (sec/SEU/104boards) by the SEU cross section and the neutron energy spectrum in the COMET Phase-I. 0.84 sec/SEU/104boards (θ=180º)

A serious problem that reliability of data from RECBEs is lost every 0.84 sec


from Y. Yang (Kyushu Univ.)

Neutron Flux at RECBEs

StrategyA. Add the self-repairing function in the firmware.

Detect SEU and correct it.

Can’t correct multi SEUs occurred at the same time. (Multi-Bit Upsets : MBU)

Simulation of this function and performance test of new firmware were done.

The next neutron irradiation test is planed

• TANDEM in Kobe Univ. on January 12th - 14th.

• Check the performance of this function.

• Measurement of MBU rate. (It is expected that MBU rate is about 1/500 of SEU rate.)

B. Add extra shielding against neutrons for the FPGA.

Not fixed yet


ref. other experiments

Summary


SummaryA. COMET Phase-I

• Search for the neutrinoless, coherent transition of muon to electron @J-PARC in 2018

• S.E.S ~ 3 × 10-15

B. Neutron irradiation test @TANDEM (Kobe Univ.) • The number of SEUs with θ=180º is about 1.7 times larger than θ=0º.

• SEU rate-1 : 0.84 [sec/SEU/104boards] (θ=180º) • Added the self-repairing function in the firmware.

C. To-do • The second neutron irradiation test at TANDEM (Kobe Univ.) on January 12th - 14th

1. Performance test of the self-repairing function. 2. Measurement of MBU rate



Backup


Readout Board

FPGA • Virtex-5 (XC5VLX155T) • For COMET CDC, rewrite the firmware

for Belle

SFP slot • Optical Fiber • SiTCP • Send hit information. (ADC, TDC, etc.)

JTAG • RJ-45 • For downloading the firmware

LVDS • RJ-45 • Input ：Clock、TRG • Output：Busy

8ch/chip

8ch/chip

Remodel the RECBE developed for Belle-II • Aurora：remove　 • Rewrite the firmware • System Clock：128MHz → 120MHz

Mass-production of RECBEs was completed at IHEP in China

• 104 boards：for CDC • 24 boards：for spare • Performance test @IHEP


F.G.

LV Power SupplyRECBE

Clock Generator

G.G.

Downloader PC (VAIO)

Optical Media Convertor PCHUB

JTAG~5mLV Cable~5m

Optical Fiber~?m

LAN LAN

USB

LEMO

LEMO

LEMO

Beam area Beam safe area

TRGCLK

TEST IN

Delay : 500 ns

Setup 21Year-end joint session 2015

Neutron Flux @TANDEM 22Year-end joint session 2015

ref. Hitoshi Nakanishi (Univ. of Tokyo), JPS 2015 autumn







Issue

Angle0 20 40 60 80 100 120 140 160 180

Rat

e In

vers

e [n

/SEU

/Virt

ex-5

]

180

200

220

240

260

280

300

320

340

610×

Rate Inverse

Angular dependence

Rate0�

Rate180�=

3.16⇥ 108

1.82⇥ 108⇠ 1.74± 0.13

SEU rate dependents on a incident angle of neutrons.

What is thought to be the factor • Structure of the RECBE • Component of the FPGA and the PCB • etc. . .

This topic is presently under investigation


Geometry of Detector Section27Year-end joint session 2015

from Y. Yang (Kyushu Univ.)

Documents

Readout electronics development for CDC in …osksn2.hep.sci.osaka-u.ac.jp/~s-ono/slides/Nakazawa.pdfReadout electronics development for CDC in COMET Phase-I Nakazawa Yu Kuno-g 2015.12.25