Status of CTF3 Operation, Status of CTF3 Operation, update of experimental update of experimental

program and schedule for program and schedule for 20112011

CTF3 committee 18.08.2011 Steffen Doebert BE/RF

• Highlights and problems• Installation period in September• Rest of the year program

Smoke in MKS02

One month stop

Planning 2011Planning 2011

1

3

4 5

2a

3 GHz beam setup to CRinitial beam to CLEXCALIFES setup

CR x4 combinationemittance studiescombined beam to CLEX

100 MV/m accelerationbreakdown kicksTBL deceleration(1-2 days for DB beam studies)

Test of new PETS on-off schemeTBL deceleration up to 8 PETS

ε < 150 mm mradlongitudinal studiesstability x8 combination(night running for BDR)

breakdown rate measurementsPETS / ACS

1

2

3

4

5

2a 1.5 GHz beam setupx8 combination(if TWT is available – only 1 operational)

>

Beam phase CSRrep. rate / losses night supervision

INSTALLATION TBL PETS

PETS on-off

today

>

✔✔

Gun

2

✔

✔

✔

✔

✔

✔

Drive Beam preparationDrive Beam preparation

• Made use of excellent factor 4 beam, 3 GHz, up to 14 A in CLEX

• Bunch length measurements in CR and CLEX with consistent results as well compared to rf measurements

• Ring optics studies in delay loop and combiner ring

• Frequent over night operation with some success

• 1,5 GHz factor 8 set up with 1.5 TWT’s, 19 A used in CLEX but clearly needs improvement. Got third TWT this week

Drive Beam preparationDrive Beam preparation1.5 GHz factor 8 combination

Drive Beam preparationDrive Beam preparation1.5 GHz factor 8 combination problems,

Response of phase switches to be investigated further

Drive Beam preparationDrive Beam preparationEmittance tuning:

Different turns are ok,Some emittance increase

due to non perfect Combination

Best results in CLEX for factor 4:

Horizontal: 250 mVertical: 150 m

Drive Beam preparationDrive Beam preparation

Aurelie

TBTS resultsTBTS results

• Up to 150 MV/m two beam acceleration measured

• Consistency with power calibrations and acceleration

• Breakdown rate measurements established

• Breakdown kick measurements not yet successful might be limited by probe beam BPM resolution

• FLASH box installed

TBTS resultsTBTS results

Two beam acceleration measured with the probe Two beam acceleration measured with the probe beam (CALIFES) up to 150 MV/m, ~ 50 ns pulse beam (CALIFES) up to 150 MV/m, ~ 50 ns pulse

lengthlength

TBTS resultsTBTS results

Example of a two beam acceleration Example of a two beam acceleration measurementmeasurement

(probe beam at 2 Hz and drive beam at 1 Hz)(probe beam at 2 Hz and drive beam at 1 Hz)

TBTS resultsTBTS results

Well established two beam acceleration Well established two beam acceleration experimentsexperiments Calibration converging, structure correctly Calibration converging, structure correctly tunedtuned Interesting breakdown studies startedInteresting breakdown studies started

Last data point 88 MV/m, 2 10-5

TBTS resultsTBTS results

Breakdown location in the structure, AlexeyBreakdown location in the structure, Alexey

TBTS resultsTBTS results

Breakdown statistics, AlexeyBreakdown statistics, Alexey

Period Pulses Number of BD

2010 1.5 MPulses 40 kBD

2011 beginning 250 kPulses 2.5 kBD

2011 last 4 weeks 410 kPulses 10 kBD

Total 2.2 MPulses 53 kBD

Equivalent to 10 hours klystron processing at 60 Hz

80 85 90 95 100 105 110 115 12010

-7

10-6

10-5

10-4

10-3

Average unloaded gradient (MV/m)

Bre

ak

do

wn

pro

ba

bili

ty /(

m)

T18 [1] 230 ns, 1400 hT18 [2] KEK 252 nsT18 [3] 230 ns, 200 hTD18 [3] 230 ns, 1000 hTD18 [2] KEK 252 ns 2000hTD18 [2] KEK 252 ns 2500hT24 [3] SLAC 230 ns 650hT24 [2] KEK 252ns 1700hCLIC goalTD24 CTF3 TBTS 200ns 10h

2.4BD/hr ~ 6.4 x 10^-5

bpp/m

Mostly the A

CC

related BD

’s.Comparison with Comparison with

T24_KEKT24_KEK

TBL resultsTBL results

• Deceleration measurements at 14 A and 19 A with nicely consistent results

• BPM resolution measurements, visit from Juanjo and Gabriel

• Beam stability measurements

• Big effort on beam based alignment studies

• All 4 PETS produce power according to expectations up to 60 MW

TBL resultsTBL results

time

(n

s)

P/P0 (%)

TBL: P0=109.7 MeV/c

-10 0 10

500

600

700

500 600 700

0

10

20

30

I Be

am

(A

)

time (ns)

IBPM 1030

(A)

5 ISegDump

(A)

-10 0 10

0

0.5

1

P/P (%)

Ppeak

=109.9 MeV/c, PFWHH

=9.628%

500 600 700105

110

115

120P

pe

ak (

Me

V/c

)

time (ns)500 600 700

0

5

10

15

P

FW

HH

(%

)

Deceleration with 18 A, segmented dump measurement

TBL resultsTBL results

0 100 200 300 400 500108

110

112

114

116

118

120

122

time (ns)

de

ce

lera

tio

n (

Me

V)

Prediction from rf power

Prediction from beam currentSegmented dump measurement

Factor 8 combination ~ 18 A, form factor 0.85, 10% power calibration error

TBL resultsTBL results

10A three turns segmented dump,Compared to placet simulations, center energy shifted by 1 MeV

Luck shot ? In general we measure to high energy spread (combination error)

90 95 100 105 110 115 120 125 130 135-0.2

0

0.2

0.4

0.6

0.8

1

1.2

Energy (MeV)

Inte

nsity

(a.

u.)

Seqmented dump 10 A

Placet simulation 10 A

Reidar, Maja

TBL resultsTBL results

0 2 4 6 8 10 12 140

1

2

3

4

5

6

7

8

9

Beam Current (A)

Me

as

ure

d d

ec

ele

rati

on

(M

eV

)

Segmented dump measurement

Prediction form beam current

Have to assume 119 MeV initial energy, 117.5 measured 1% errorForm factor for predictions with current F=0.8 usedTo make the prediction from power fit, need to assume 10% calibration error

Pretty good agreement !

TBL resultsTBL results

5 10 15 20 25 300

5

10

15

20

25

BP

M r

esol

utio

n [u

m]

Beam Current [A] -30 -20 -10 0 10 20 300

2

4

6

8

10

12

14

(Measured - Predicted) beam position (m)

No

of p

ulse

s

BPS resolution study together with Junajo (IFIC) and Gabriel (UPC) Vertical resolution, 13 A, BPS0510, 8.7 m

TBL resultsTBL resultsSophisticated Beam based alignment studies by

Guido and Eduardo

• Quadrupole center and its movement, use Quad movers and change strength• One to one steering, response matrix measurements• BPM and Quad misalignment using different phase advance optics

CLEX installationsCLEX installationsSeptemberSeptember

Installation of 4 -5 more PETS tanks and PETS ON/OFF

Program towards the Program towards the rest of the yearrest of the year

• PHIN run

• Terra experiment

• Improve 1.5 GHz factor 8 beam

• TBL deceleration with 8 PETS for CDR

• Beam stability measurements at 3 GHz and 1.5 GHz

• Emittance and bunch length control

• Breakdown kick measurements

• Beam loading compensation for main beam

ConclusionConclusion

• Pretty good progress

• 1.5 GHz will need more time to be optimized

• CALIFES, available when needed, nice two beam measurements

• Installations in September planned

• Intense run period October-December to get final results for CDR