January 23 rd, 2008 CNGS & OPERA status Yves Déclais 1 I) CNGS status radiation damage on electronics strip line repair II) OPERA issues Based on the work

January 23rd, 2008 CNGS & OPERA status Yves Déclais 1

I) CNGS status

• radiation damage on electronics• strip line repair

II) OPERA issues

Based on the work done by the CNGS/SBWG and the report given to RPC08 by I. Efthymopoulos

• proton intensity for the 2008 run• OPERA experiment status


Radiation damage on electronics


CNGS Electronics - underground

Designated “radiation safe” areas for electronics


Ventilation Electronics - Layout

Temperature Probes

Ventilation Units

Target Chamber

Service Gallery

Proton Beam Line

…electronics equipment

Ventilation Chamber Junction gallery


Electronics Racks inside the Service GalleryVentilation ducts (to be moved)


Installed ventilation equipments

Unit 231

Ventilation duct

Service Gallery TSG4

Unit 232

TSG44

Balcony TCV4

Location of broken PLC


Junction Gallery


Radiation field – FLUKA simulation

Energetic (>20 MeV) hadron fluence (/cm2/yr1) for a nominal CNGS year of 4.5E19 pot

~ 107 – 109 h/yr

A.Ferrari, et. al., 2007

Location of observed failures

Can create Single Event Effects on electronics (bit flip, single event upsets...)

A fluence of ~109 h/yr would correspond to ~19 failures/yr per device



Total dose in Gy/y for a nominal CNGS year with 4.5E19 pot

~ 0.1 – 10 Gy/y


Commercial electronics typically do not fail below 1 kRad (10 Gy)



~ 109 – 1011 n/cm²


Commercial electronics typically do not fail below 1010 n/cm2

1 MeV eq. neutron fluence (cm-2 yr-1) for a nominal CNGS year of 4.5 E19 pot


Radiation effects on electronics

The ventilation electronics that failed were installed along the TSG4 gallery next to the ventilation ducts and in the TCV4 balcony

In both areas the radiation levels as predicted by the simulations are far too high for COTS componentsthe electronics should have failed and they did !

No failures to electronics in the TSG4 “safe” area were observedShould not have happened according to simulations

for the beam intensities we had, however would have happened if we were running longer...

During the 2007/2008 shutdown, work is organized to remedy the problem and assure nominal running of the facility for 2008 and beyond.


Actions for 2008 shutdown

General guideline:General guideline:

Move whatever is possible of the electronics out of the CNGS tunnels

For the equipment, which needs/must stay in the area: Create a “radiation-safe” area by adding adequate shielding and move all the electronics in there Address the sensitivity to radiation of the installed electronics and investigate upgrade possibilities to rad-tol components Assure a MTBF – of at least 1 year redundancy and preventive maintenance actions Install radiation monitoring system for electronics as in LHC


Ventilation duct layout

TCV4

TCC4

TSG4

old

TCV4

TCC4

TSG4

new

Shielding plugs


New shielding plugs – TSG4 & TSG41


Status

The layout modifications will have no impact on operation and design principles of CNGS

However, access rules, procedures and dose estimates for maintenance operations need to be updated

Simulation studies are ongoing to estimate the radiation field for the electronics Preliminary results with “ideal” shielding (minimal penetrations) show a reduction of at least 104 in the high energetic hadrons, reality could be x10 lower Work is ongoing to implement the final shielding geometry as to be built.

Basically no work will be executed close to the “hot” areas in TCC4. In the rest of the areas the radiation levels are rather low.

Nevertheless, for the planning and execution of the works in-situ the same procedures as with the horn repairs will be followed

Optimization of design and execution taking into account RP and safety constraints Detailed planning of activities in parallel to dose planning Supervision of the works/workers in-situ ; use of appropriate materials for RP and waste handling



Ventilation: modified layout in TSG41


Shielding layout in TSG41


Tentative Schedule of the work

Very tight schedule: no contingency, 1-2 weeks to be added for beam commissioning


Gy/yr for a nominal CNGS year of 4.5 1019 pot

No shielding0.1 - 10

With shielding

(caveat: the option simulated in TSG41 does not include the ventilation ducts)


1 MeV eq. neutron fluence (cm-2 yr-1) for a nominal CNGS year of 4.5 1019 pot

No shielding 109 - 1011

With shielding



Energetic (> 20 MeV) hadron fluence (cm-2 yr-1) for a nominal CNGS year of 4.5 1019 pot

No shielding108

106

With shielding



Fluences in front of the shielding


TSG41 shielding : preliminary results

Fluence of high energy hadrons

Absorbed dose [Gy per particle]

simu

simu


Strip Line Repair


Reflector flexible cable : Strip line

Failure observed only in the outer plate of the reflector The break is due to material fatigue from the mechanical & thermal effects during pulsing, most likely enhanced by the treatment during construction (brazing, etc..)

Last minute discovery before the 2007 startup Flexibles are needed to compensate for mis-alignment errors in the striplines and absorb the thermal dilation during operation


Reflector flexible cable : strip line

Temporary measures taken in 2007 to continue with the run:

Insulating sheets installed on the flexible section

Protects against short-circuits Installed on horn and reflector

Put an electrical by-pass in place Ensure that current still flows in case last cable breaks Installed on most outer reflector plate

In shutdown 2008: Design new flexible strip lines Replace existing ones for both horn & reflector


Proton intensity for the 2008 run


2008 run : SPS schedule

147 days max for the CNGSSpread over 23 weeks

(Nominal CNGS year : 200days)

May 29th

November 10th


2008 run : Super-Cycle

SPS super cycle as in the proposal

Proposed super cycle in 2008:

Extended to 39.6 sec in 2007:• 3 CNGS : 18 sec• fix target cycle 16.8 sec

(flat top 4.8 9.6 sec) • MD cycle added (4.8 sec)

Adding LHC pilot cycle: 8.4 sec super cycle = 48 sec ! tuning parameters:

o replace the LHC pilot cycle (and MD cycle ?) by CNGS cycles when LHC R&D is offo reduce the flat top for fixed target experiments to 4.8 sec


2008 run : expected statistics

Expected 2008 run Nominal CNGS

Number of days 147 200

Super Cycle (sec.)

48 27.6

Circulating proton

3.8 1013 4.5 1013 4.8 1013

efficiency 70% 80% 55%

Integrated pot 2.1 1019 2.9 1019 4.5 1019

Total number of interactions 2770

CC events 2070

NC events 455

Electron events 16

Charm decay 83

Tau candidate (@2.5 10-3 eV2) 1.1

Minimal granted by CERNIf no delay in the CNGS repair

~120 evts/week


Possible gain for the number of CNGS cycles

(A) Nominal 2008 Super Cycle 3 CNGS / 48 sec

1800 CNGS/shift 1.

(B) Reducing flat top to ~4.8 sec 3 CNGS / 43.2 sec

2000 CNGS/shift 1.11

(C) B + adding 1 CNGS cycle 4 CNGS / 49.2 sec


(D) C + replacing LHC & MD by CNGS 6 CNGS / 48 sec


(E) CNGS dedicated mode 1 CNGS / 6 sec

4800 CNGS/shift 2.7

Only way to increase the nb of pot and (or) compensate CNGS delay

Example of an optimized week (for OPERA):• scenario C during day shifts (working days)• scenario D during night shift and WE

Gain : ~1.7

This would imply up to ~200 evts /weekCan OPERA handle this rate ?


OPERA issues:

Status of the preparation of the OPERA experiment :

• Detector filling• Electronic detectors• Brick handling, processing, scanning

In 2008, our main goal is to get a full year of data taking:

First OPERA year

First candidates


Detector filling

Remember what was the situation one year ago !Warmest congratulations to the teams involved:

Brick components (Lead & CSd), BAM & BMSCoordinated in a Kaisen way by Salvatore

brick production/filling

020000400006000080000

100000120000140000160000180000

1 8 15 22 29 36 43 50 57 64 71 78 85 92

weeks

bri

ck

s

2 drums/day

2.5 drums/day

3 drums/day

real

154000

June 10th

July 28th

October 25th

Achieved !

Including 15% contingency (~3 weeks)


Electronic Detectors

SM1

VetoBMS

Target tracker

SM2

Spectrometer:XPC, HPT, RPC, magnet

all installed & commissioned DAQ validated, data transfer onto the DB implemented data analysis tools being tuned on real data !

o HPT reconstruction still to be validatedo Event reconstruction & Brick Finding:

more data needed for a complete tuning


Brick Handling, Processing & Scanning

This subject was the purpose of this Workshop

it was a very fruitful meeting, organized in a smart waythanks to Nakamura san, Hoshino san, Sato san & Kodama san

better to look at the summary reports from the Working groups

Recommendation:

1) Do not underestimate the amount of work for a nominal OPERA year with 5200 events this year 320 shifts to be fulfilled for the film development improving the track finding efficiency in the CSd is an issue

2) Quality control is essential during the brick processing


CONCLUSION

Looking forward to discuss the first Tau candidates next year in Nagoya

Keep your fingers crossed …in your mind, you need your hands for working !


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January 23 rd, 2008 CNGS & OPERA status Yves Déclais 1 I) CNGS status radiation damage on electronics strip line repair II) OPERA issues Based on the work