OPERA bricks development @ LNGS

G.Rosa, C.Sirignano

Emulsion Workshop, 7-9 December 2006

Development facility commissioning

Last October and November several activities took place at LNGS,every week at least 5 people (Bari, Bologna, Roma and Salerno) were on shift in order to be ready to handle real bricks.

• Dark room set up (safe lights)

• Climatization tuning

• Develop tanks tests and cleaning (water + chemicals)

• Automatic disposal of chemicals

• Gridding machine installation

Week 39

Sep. 25-29

Week 40

Oct. 2-6

Week 41

Oct. 9-13

Week 42

Oct. 16-20

Week 43

Oct. 23-29

Week 44

Oct. 30 -Nov.5

Week 45

Nov. 13-19

G. Rosa

L. Ioannucci

V. Di Pinto

C. Valieri

P. Pecchi

E. Buccheri

E. Carrara

A. Pelosi

G.Capradossi

G. Romano

C. Sirignano

M. Ieva

A. Andriani

M. Castagna

E. Buccheri

P. Sestito

A. Pelosi

G.Capradossi

C. Sirignano

D.Di Ferdinando

R. Diotallevi

P. Di Pinto

V. Togo

E. Carrara

A. Schembri

E. Buccheri

G. Romano

C. Sirignano

P. Di Pinto

C. Valieri

P. Pecchi

G. Rosa

A.Pelosi

G.Capradossi

G. Rosa

C. Sirignano

D.Di Ferdinando

L. Ioannucci

V. Di Pinto

R. Diotallevi

E. Buccheri

C. Sirignano

A. Pastore

M. Castagna

C. Valieri

A. Andriani

P. Pecchi

G. Rosa

C. Sirignano

G.Romano

M.Ieva

P. Di Pinto

R. Diotallevi

A.Andriani

E. Buccheri

G.Rosa

Sh

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ssShiftsShifts

2 chains ready since November 3rd to be used in manual mode

• Chemical preparation - Manual

• Development - Manual

• Chemical disposal - Automatic

First development done using the first chain (Oct 25 th)

1 chain commissioned November 2nd (10 bricks successfully developed)

Development quality

• 10 bricks from BAM (wrong piling or incorrect wrapping) (1 developed in CS facility as reference)

• OPERA like procedure (transportation, labeling)

• Standard develop procedure and solution refresh rate

• Emulsion quality monitoring (trasparency and fog count)

Film transparency is good and no degradation observed up to now(yellowing or abnormal thickness).

Two more months at least are needed to be sure that films will not turnto yellow, anyway no dramatic effects detected.

1 2 3 4 5 6 7 8 9 Ref

FD 8.2(0.5

)

37.8(2)

8.6(0.4

)

7.5(0.5

)

8.2(0.2

)

8.4(0.4

)

7.8(0.3

)

9.1(0.5

)

8.4(0.5

)

8.6(0.5

)

Films having hole (first shipment)

Fresh water inFresh water in

DevDev StopStop CleanClean FixFix WashWash11

WashWash22

GlycGlyc30 l 30 l 30 l 30 l45 l

45 l 45 l

750 l500 l 250 l 250 l 250 l

300 l

Transfer of chemicals from Transfer of chemicals from preparation tankspreparation tanks

250 l 750 l

Waste 1Waste 1 Waste 2Waste 2 Waste 3Waste 3 Waste Waste waterwater

Status

OPERA bricks development (Nov 2006)

14 bricks were developed using the standard procedure

9 bricks were used for cosmic test

5 bricks extracted from the detector

We used for cosmic test some bricks that BAM tagged as “out of spec” because of wrong Z dimension; that means they had double lead layers or double emulsion layers.

CS were developed in the underground facility and ECC films + VETO filmsadded during the cosmic exposure were developed outside.

CS films measurements

We carried on a single development for all CS films and related FD are thefollowing:

ID FD (g/(10 m)3

973 9.1 + 0.1

1166 9.5 + 0.1

1025 9.2 + 0.1

635 10.2 + 0.1

824 9.0 + 0.2

1117 7.5 + 0.2

605 10.5 + 0.2

681 9.8 + 0.2

315 9.2 + 0.2

ID FD (g/(10 m)3 370 6.5 + 0.5

521 9.8 + 0.2

456 9.2 + 0.2

235 6.5 + 0.2

703 10.5 + 0.2

FD same as TTCS sample developed in August

TTCS same sample ???

In order to study more in details fog-up problem on double refreshed filmsa new exposure at BTF (Frascati) is planned fro the next week and films willbe developed at LNGS starting from Dec 20th.

ECC films measurements

We carried on a single development for ECC and VETO films:

ID FD (g/(10 m)3

973 10.1 + 0.2

1166 9.0 + 0.2

1025 9.0 + 0.2

635 9.2 + 0.5

824 9.9 + 0.3

1117 10.2 + 0.3

605 8.8 + 0.4

681 15.0 + 0.5

315 30.0 + 0.5

ID FD (g/(10 m)3 370 10.0 + 0.5

521 10.0 + 0.5

456 11.0 + 0.5

235 14.0 + 0.5

703 13.2 + 0.5

VETO films FD is 7.5 + 0.5 . First shipment + hole

824

315

2nd shipment

1st shipment

Develop order

Brick Id FD (g/(10 m)3 Note315 30.0 + 0.5 New

developer

635 9.2 + 0.5

824 9.9 + 0.3

973 10.1 + 0.2

1025 9.0 + 0.2

1166 9.0 + 0.2 New fixer

1117 10.2 + 0.3

605 8.8 + 0.4

681 15.0 + 0.5

Cosmic test bricks

ID FD (g/(10 m)3 Notes235 14.0 + 0.5 New dev &

fix

703 13.2 + 0.5

521 10.0 + 0.5

456 11.0 + 0.5

370 10.0 + 0.5

Extracted bricks