Status Report for E391aStatus Report for E391a(Continuation of the previous PAC on April)(Continuation of the previous PAC on April)

G.Y.Lim

IPNS, KEK

Group Meeting at the JINR

26th – 29th July 2003

Dzhelepov Laboratory of Nuclear Problems

After the previous PACAfter the previous PAC

Start assembling the front barrel Continuous fabrication of the central barrel Evacuation test of the downstream section

E391a DetectorE391a Detector

Upstream section

Downstream section

Middle Section

Upstream SectionUpstream Section

Module fabrication was done – Dec. 2002Instrument for assembling was fabricated

– Collaboration work with KEK machine shop

Start assembling - August 2003– Will take one month

Evacuation/cosmic test will be done Sep. 2003

Slide show for FB assemblingSlide show for FB assembling

5th August 2003

ContinuouslyContinuously

22nd August (Expected)

CC02CC02Shashlik type of beam counter

Arrived at KEK on 4th July from U. of Chicago

Beam test at pi2 July 2nd ~8th, 2003

8 % resolution @ 1GeV, 10 p.e./MeV deposit

(Very preliminary !!!)

After CC02 installation After CC02 installation ・・・・・・

Aiming to finish by the end of August

Middle sectionMiddle section

Module fabrication – Final stage

Glued plates

0200400600800

1000120014001600

Weeks

Num

ber o

f Plat

es

Glued Plates

50 plates/week

Finish at the middle of Sep.

Module Stacking

0

5

10

15

20

25

30

35

2003

/2/1

4

2003

/2/2

8

2003

/3/1

4

2003

/3/2

8

2003

/4/1

1

2003

/4/2

5

2003

/5/9

2003

/5/2

3

2003

/6/6

2003

/6/2

0

2003

/7/4

2003

/7/1

8

2003

/8/1

2003

/8/1

5

2003

/8/2

9

2003

/9/1

2

2003

/9/2

6

2003

/10/

10

2003

/10/

24Weeks

Num

ber

of M

odul

es

Stacking on every Wed.

Working more than 8 person

End of September

Middle sectionMiddle section

Module fabrication – Final stage Vacuum vessel is being constructed

– Competition bid – Hitachi Zosen Ltd.– Will arrive at KEK at the end of Oct. 2003

Assembling scenario was fixed– Collaboration work with Entek

Assembling will be done by the middle of Dec. 2003

Downstream sectionDownstream sectionAssembling was finished – Sep. 2002 Beam test (Engineering run) – Oct. – Dec. 2002Evacuation test – June 2003

– First time of operation for calorimeter in vacuum – Test for the water cooling mechanism

Cooling SystemCooling SystemControl PMT temperature within 1 0C

with circulating water

Installation of the cooling systemInstallation of the cooling system

Temperature MeasurementTemperature Measurement

Divider

CsI

We got clear Cosmic responseWe got clear Cosmic response

50C Cooling water 100C Cooling water

150C Cooling water 200C Cooling water

ｐ Q/cm

Temp. dependencyTemp. dependency

Cosmic Peak position

Cosmic Peak width(sigma)

Normalized by the engineering data

CsI temp.　（ 0C)

MeV

/pC

Light Yield : -1.3% / 0C

ScheduleSchedule

Aug. Sep. Oct. Nov. Dec. Jan. Feb.

FB assembling

CB fabrication

CB assembling

Cosmic test/counter tuning

Start data taking

Evacuate system

Unite three sectionsCheck Membrane

Moving downstream

Cosmic and evacuate test for the upstream

A/D Card upgrade

ADC Replacement

BA and CC05 installationCV PMT install

CC04/CC05 Fabrication CC04 Installation Cooling system

for Barrel

Additional Cabling

Downstream vacuum test

Middle section fabrication Membrane

BCV

Beam

SummarySummary

E391a is aiming at measuring the BR( KL )– Realizing Step-by-step

Preparation of E391a – Three parts are being prepared in parallel– Manage to catch up the schedule

Prompt start – Well tuned electronics and DAQ at the engineering run– Cosmic test for each detector components– Minimum beam time for tuning