CTF3 schedule following the fire incident

CTF3 schedule following the fire incidentCTF3 schedule following the fire incidentR. Corsini – CLIC/CTF3 Coll. Board – 7 May 2010

CTF3 schedule following the fire incident

CTF3 schedule following the fire incident


• Thu 4 Mar, lunch time …

Modulator in Gallery

Faraday Cage

Pulse Forming Networkin Faraday Cage

Pulse Forming Networkafter fire

Fire in MKS13 Faraday Cage

DRIVE BEAM LINAC

CLEXCLIC Experimental Area

DELAY LOOP

COMBINERRING

CTF3 – Layout

10 m

4 A – 1.2 ms150 Mev

30 A – 140 ns150 Mev

MKS 13


Events and actions

• Modulator turned on around 12h00

• Smoke alarm level 3 at fire service 12h33

• Fire Service in place at 12h42Smoke from MKS 13General emergency stop activated

• All electricity (including MKS13) cutapart from lift and smoke extraction system

• CO2 , powder, then water and eventually foam applied => corrosive!!!

• Fire extinguished around 16h00

• Building access refused to everyone apart from fire service and safety commission

• Cleaning company BELFOR contacted for swab testing to check contamination of zone

• Safety commission enquiry started Surveillance camera image


Clean up

• Gallery partitioned initially into 2 zones (contaminated area + “clean area”)

• Clean up of contaminated area, initial estimation > 4 weeks

• New swab test on equipment in “clean area”, contamination of ventilation ducts

• Clean up scheduled for 6 weeks• cleaning finished 27 April (most of it even before)

• All electrical systems locked off• gallery classified as non controlled area (cleaning firm didn’t need film badges)

=> no beam or RF possible

Contaminated area from MKS13


Components from each rack dismounted and identified

Dust removal from sub components

Chemical cleaning

Ovens for drying after chemical cleaning

Vacuum ovens for 2nd stageCleaned components waiting for reinstallation in gallery

Cleaning procedure


Some images from gallery


Damaged cables

• >300 cables and ~40 HV vacuum cables in front of PFN damaged• All cables will be repaired – 4 ½ weeks estimated => until 26 May

• complete replacement (vacuum)• replace damaged section with connectors at both ends

• consequence:• all power still disconnected in the klystron gallery => until 20 May • vacuum pumps off in Delay Loop, Combiner Ring + part of linac

• Main worry: testing of connections (plus cleaned electronic racks…) => bumpy start-up?


Restart planning

• Meeting on Wednesday 24th March with groups and departments who have equipment in the area to define an action plan for recovery after the clean up

• meeting three days ago about detailed planning

• Fire detection system gets repaired this week=> fire detection tests after re-establishing general power

• visual inspection by equipment experts

• gradually power on the equipments when powering possible=> hardware + controls tests

• modify klystrons for increased safety

• restart klystron interlock system for access => safety chain tests

• 3-4 weeks after end of cable repair

=> restart RF mid june

Other activities in the shadow:

• Remove two accelerating structures(as late as possible, when vacuum pumps are powered again)

• Realign beam lines in CLEX• Repair leaks in TBL PETS• Repair high power attenuator for RF deflectors• Maintenance of local cooling towers


Optics improvements (DL dispersion)Full transport to CLEX

Bunch length control (first tests)

PETS conditioned to nominal power/pulse length

Accelerating structure conditioned to nominal power/pulse length

PETS breakdown rate measurements?

Test of new PETS on-off scheme

Two-Beam test power & energy gain,

100MV/m

Beam Loading compensation experiment

Measurement of breakdown kicks

Measurement of effect of beam loading on breakdown rate

1st TBL PETS installation

Operating scenario for 2010

(from CTF3 Committee of 11th February)

2nd TBL PETS installation

TBL studies

• Stability studies & improvements• PETS no recirculation• Phase stability• Operation at 5 Hz (or more)• Control of beam losses• Coherent Diffraction Radiation …

2nd run PHIN

TBL studies 30% deceleration


Bunch length control < 1 mm rms (end of linac)

Full beam loading (95% transfer) high current acceleration (up to 5 A)

Ring isochronicity ap < 10-4

Sub-Harmonic bunching with fast (< 6ns) 180 phase switch(8.5% satellites)

Control of ring length to better than 0.5 mm

Factor 2 combination in Delay Loop (from 3.5 to 7 A)

Bunch train recombination factor 4 in Combiner Ring (from 3 to 12 A)

Beam current stability ~ 0.1 % end-of-linac,~ 0.2 % combiner ring

Transverse rms emittance 100 p mm mrad (end of linac)

Bunch train recombination 2 x 4 in DL and CR (from 3.5 to 28 A)

Transverse rms emittance < 150 p mm mrad (combined beam)

Bunch length control < 1 mm rms (combined beam)

Beam current stability ~ 0.1 % for combined beam

CTF3 Achievements – What is still missing for feasibility – Drive Beam Generation


Beam-powered test of a PETS with external recirculation to 170 MW, <200 ns - ~10 A beam currentPower & drive beam energy loss measurements.

CTF3 Achievements – What is still missing for feasibility – TBL / TBTS / CALIFES

Beam-powered test of a PETS to nominal parameters (135 MW, 240 ns) with external recirculation (10 A) and without (20 A) – including probe beamImproved power & drive beam energy loss measurements(Break-down kick measurement).

8 PETS + spectrometer installed to verify transport of a 28 A beam with up to 30% of energy extracted.

Nominal probe beam to end of line (no accelerating structure)

Probe beam acceleration to 100 MV/m.


Optics improvements (DL dispersion)Full transport to CLEXBunch length control (first tests)TBTS initial PETS testsCALIFES setupnew setup when MKS13 available?

PETS conditioned to nominal power/pulse lengthTBL PETS tests

Accelerating structure conditioned to nominal power/pulse length

PETS breakdown rate measurements???

Test of new PETS on-off scheme

Two-Beam test power & energy gain, 100MV/m

Beam Loading compensation

experiment

Measurement of breakdown kicks

Measurement of effect of beam loading on breakdown rate

1st TBL PETS

installation

PHIN possible

<-------->

2nd TBL PETS installation

6 weeks PHINphase-coding

Laser preparation

TBL studies(limited)

• Stability studies & improvements• PETS no recirculation• Phase stability• Operation at 5 Hz (or more)• Control of beam losses• Coherent Diffraction Radiation …

TBL studies 30% deceleration ?

1

1

2

2

3

3

4

5

6

8

7

4 5 67

8

1

4

2 3

65

7 8


Conclusions

• 17 weeks delay with respect to nominal program (42 weeks initially planned operation time)

=> >40% of the beam time lost!

• klystron MKS13 not available, acc. structures are removed

=> lower energy than before => complete new machine setup

• repair of MKS13 man-power limited, will happen late in the year (possibly back to nominal energy only in 2011)

• difficult start-up with additional HW checks

=> only less than half of useful beam time this year=> compromises on the program 2010 have to be made

• plan to have minimum winter shutdown and continue operation early in 2011

=> the items planned for up to end 2010 extend to mid 2011

Documents

CTF3 schedule following the fire incident