TTF-II Status & Prospectives Nick Walker DESY 5 th ITRP Meeting – 28.06.04 CALTECH

TTF-II Status & TTF-II Status & ProspectivesProspectives

Nick WalkerNick WalkerDESYDESY

55thth ITRP Meeting – 28.06.04 CALTECH ITRP Meeting – 28.06.04 CALTECH

OverviewOverview

Brief review of TTF activity this yearBrief review of TTF activity this year• Commissioning status / updateCommissioning status / update

Status of TechnologyStatus of Technology Future plansFuture plans

TTF-II 800 MeV SC linacTTF-II 800 MeV SC linac

RF gun

4 MeV 150 MeV

bunch compressor

ACC1 (M2*)

Laser

3rd harmonic

cavity diagnostic section

beam dump

12 MV/m 20 MV/m

ACC2(M1*) ACC3(M3*) ACC4(M4) ACC5(M5)

Successfully commissioned with beam

Successfully commissioned with RF power(hp coupler conditioning)

TTF-II 800 MeV SC linacTTF-II 800 MeV SC linac

RF gun

4 MeV 150 MeV

bunch compressor

ACC1 (M2*)

Laser

3rd harmonic


beam dump

12 MV/m 20 MV/m

ACC2(M1*) ACC3(M3*) ACC4(M4) ACC5(M5)

Dark current & radiationmeasurements at 25MV/m

Pagani

TTF-II Injector CommissioningTTF-II Injector Commissioning

RF gun

4 MeV 150 MeV

bunch compressor

ACC1 (M2*)

ACC2(M1*) ACC3(M3*)

Laser

3rd harmonic


beam dump

12 MV/m 20 MV/m

RF Gun:RF Gun:• 21-Feb-2004 21-Feb-2004 start conditioningstart conditioning• 6-Mar-2004 6-Mar-2004 5 Hz, 900 us, 3 MW5 Hz, 900 us, 3 MW• 16-Mar-2004 16-Mar-2004 10 Hz, 450 us, 3 MW10 Hz, 450 us, 3 MW• 17-Mar-2004 17-Mar-2004 first beam in gun sectionfirst beam in gun section

Injector:Injector:• 15-Apr-2004 15-Apr-2004 start injector commissioningstart injector commissioning• 7-Jun-2004 7-Jun-2004 end commissioningend commissioning

Linac:Linac:• 20-Aug-200420-Aug-2004 restart with complete machinerestart with complete machine


RF gun

4 MeV 150 MeV

bunch compressor

ACC1 (M2*)

ACC2(M1*) ACC3(M3*)

Laser

3rd harmonic


beam dump

12 MV/m 20 MV/m




ACC1 coupler conditioning 35MV/m EP cavity test

The 35MV/m Cryomodule TestThe 35MV/m Cryomodule Test

35MV/m

5109

AC72: one of five high-performance EP cavities

The 35MV/m Cryomodule TestThe 35MV/m Cryomodule TestAC72: one of five high-performance EP cavities

35MV/m

5109

Acceptance test in vertical cryostat

• naked cavity• Low power• CW


35MV/m

5109


• HP coupler• Tuner (fast/slow)• full power (system) test

Full 1/8th CM horizontal test

(CHECHIA)

Transferred to





(CHECHIA)

Transferred to

Full 8 string CM TTF

Transferred to





(CHECHIA)

Transferred to

Full 8 string CM TTF

Transferred to

35 MV/m EP TESLA Cavity accelerates beam for the first time 35 MV/m EP TESLA Cavity accelerates beam for the first time

0

5

10

15

20

25

30

35

40

0 500 1000 1500 2000 2500

t [us]E

acc[M

V/m

]

RF pulse with feedback in RF pulse with feedback in cavity 5 (AC72) during beam cavity 5 (AC72) during beam accelerationacceleration



• RF measurements showed no degradation of performance (35MV/m achieved)

• RF gradient measurement calibrated using beam (energy spectrometer)

• No measurable radiation detected(no dark current)

No time for long-term system test due to TTF-II commissioning, but…

0

5

10

15

20

25

30

35

40

0 500 1000 1500 2000 2500

t [us]

Eac

c[M

V/m

]

RF pulse with feedback in RF pulse with feedback in cavity 5 (AC72) during beam cavity 5 (AC72) during beam accelerationacceleration

35 MV/m EP TESLA Cavity accelerates beam for the first time 35 MV/m EP TESLA Cavity accelerates beam for the first time

AC73 Full System Test inAC73 Full System Test in1/81/8thth Cryomodule (CHECHIA) Cryomodule (CHECHIA)

1100 hr continuous 1100 hr continuous operation at 35MV/moperation at 35MV/m

No ‘faults’ observedNo ‘faults’ observed• due to couplersdue to couplers• nor due to cavitiesnor due to cavities

Forced ‘trips’ caused Forced ‘trips’ caused no damage to no damage to cavity/couplercavity/coupler• No performance No performance

degradation observeddegradation observed

AC70: New EP Result!AC70: New EP Result!

Measured Q0 factor 2 over TESLA-800 specification

May 2004

35MV/m

5109


RF gun

4 MeV 150 MeV

bunch compressor

ACC1 (M2*)

ACC2(M1*) ACC3(M3*)

Laser

3rd harmonic


beam dump

12 MV/m 20 MV/m




Problem-free commissioning of full ACC1 module for TTF-II operation

TTF Beam MeasurementsTTF Beam Measurementsbe

am e

nerg

y (M

eV)

Beam energy vs ACC1 phase

Energy spread vs ACC1 phase

rms

ener

gy s

prea

d (M

eV)

ACC1 phase (deg)

Energy stability and Energy spreadEnergy stability and Energy spread Measured in the BC dispersive section after accelerationMeasured in the BC dispersive section after acceleration LLRF with closed loopLLRF with closed loop energy stable within 0.1 %, rms = 8.5 10energy stable within 0.1 %, rms = 8.5 10-4-4 uncorrelated energy spread estimated from rising edge 25 uncorrelated energy spread estimated from rising edge 25

to 30 keVto 30 keV

Energy

Injector Commissioning:Injector Commissioning:Other HighlightsOther Highlights

Successful Successful commissioning of commissioning of bunch compressor bunch compressor BC2BC2

Emittance Emittance measurements measurements downstream of BC2 downstream of BC2 using four wire using four wire array station array station

Cavity as BPM…Cavity as BPM…

All possible due to ACC1 stable operation (turn-key system)

Measurement of Beam Position in Measurement of Beam Position in Cavity using Dipole ModeCavity using Dipole Mode

The signal of a dipole mode in a cavity can be used The signal of a dipole mode in a cavity can be used as an indication of the beam position (à la NLC)as an indication of the beam position (à la NLC)

example for vertical steering and dipole mode response in C1

mode ‘centre’

example for vertical steering and dipole mode response in C1

mode ‘centre’

Resolution: <50m

4 dipole modes which couple strongly to the beam

All modes co-axial within measurement resolution (50m)

Measurement of Beam Position in Measurement of Beam Position in Cavity using Dipole ModeCavity using Dipole Mode

The signal of a dipole mode in a cavity can be used The signal of a dipole mode in a cavity can be used as an indication of the beam position (à la NLC)as an indication of the beam position (à la NLC)

Klystrons: 3 Active CompaniesKlystrons: 3 Active Companies THALUSTHALUS

• First producer of prototype First producer of prototype achieving specs.achieving specs.

• 2 additional ‘production’ 2 additional ‘production’ modelsmodels

• Tests of modified tubes in Tests of modified tubes in July.July.

CPI• 1st prototype development• Achieved 10MW for short

pulse (tens of s, =60%)• Problems with longer pulse

(understood and being addressed)

TOSHIBA• First prototype being

prepared for initial testing (July)

Klystrons: 3 Active CompaniesKlystrons: 3 Active Companies THALUS

• First producer of prototype achieving specs.

• 2 additional ‘production’ models

• Tests of modified tubes in July.

CPICPI• 1st prototype development1st prototype development• Achieved 10MWAchieved 10MW for short for short

pulse (tens of pulse (tens of s, h=60%)s, h=60%)• Problems with longer pulse Problems with longer pulse

(understood and being (understood and being addressed)addressed)

TOSHIBA• First prototype being

prepared for initial testing (July)

Klystrons: 3 Active CompaniesKlystrons: 3 Active Companies THALUS

• First producer of prototype achieving specs.

• 2 additional ‘production’ models

• Tests of modified tubes in July.

CPI• 1st prototype development• Achieved 10MW for short

pulse (tens of ms, h=60%)• Problems with longer pulse

(understood and being addressed)

TOSHIBATOSHIBA• First prototype being First prototype being

prepared for initial testing prepared for initial testing (July)(July)

In addition: pulse cable testing starts this week at DESY

Immediate TTF-II ScheduleImmediate TTF-II Schedule

We are here

2004 2005

20.08.04

Beam in modules 3-5

35MV/m TEST

Saturation in wavelength range 30-120 nm July 2005

User operation (extended period)

Operation with full electron beam current (to be defined; 2.25 MHz?) Dec. 2005


3rd Harmonic RF system and ACC6 installed Feb. 2006

1 GeV beam energy April 2006

Saturation 6 nm June 2006


Seeding Option installed Dec. 2006

Seeding demonstration April 2007

Longer TermLonger Term

Saturation in wavelength range 30-120 nm July 2005


Operation with full electron beam current (to be defined; 2.25 MHz?) Dec. 2005


3rd Harmonic RF system and ACC6 installed Feb. 2006

1 GeV beam energy April 2006

Saturation 6 nm June 2006


Seeding Option installed Dec. 2006

Seeding demonstration April 2007

Longer TermLonger Term

High-Gradient ProgramHigh-Gradient Program 30 new cavities from industry on order30 new cavities from industry on order

• First delivery August 2004 (total ~110)First delivery August 2004 (total ~110) Will be put through our established Will be put through our established

proceduresprocedures• Electro-polishing, HPR etc.Electro-polishing, HPR etc.• No modifications to any aspect foreseenNo modifications to any aspect foreseen

8 >35MV/m cavities 8 >35MV/m cavities willwill be installed into be installed into Cryomodule #6Cryomodule #6• Tests will either be in TTF linac orTests will either be in TTF linac or• New Module Test StandNew Module Test Stand

(supported in part by new EUROFEL money)(supported in part by new EUROFEL money)• Date: 2006Date: 2006

High-Gradient ProgramHigh-Gradient Program 30 new cavities from industry on order

• First delivery August 2004 Will be put through our established Will be put through our established

proceduresprocedures• Electro-polishing, HPR etc.Electro-polishing, HPR etc.• No modifications to any aspect foreseenNo modifications to any aspect foreseen

8 >35MV/m cavities will be installed into Cryomodule #6• Tests will either be in TTF linac or• New Module Test Stand

(financed by new EU XFEL money)• Date: 2006

Final CommentsFinal Comments TTF-II (on-going) commissioning on scheduleTTF-II (on-going) commissioning on schedule

• Turn-key stable operationTurn-key stable operation TTF-II (5 accelerating modules, 800 MeV) will be fully TTF-II (5 accelerating modules, 800 MeV) will be fully

commissioned this yearcommissioned this year• All the demands of a light source user facilityAll the demands of a light source user facility

ACC6 (35MV/m) scheduled for 2006ACC6 (35MV/m) scheduled for 2006 Successful transfer of 35MV/m to a standard TTF Successful transfer of 35MV/m to a standard TTF

cryomodule has been demonstrated in ACC1cryomodule has been demonstrated in ACC1• Acceleration with beamAcceleration with beam• No radiation measured (no dark current)No radiation measured (no dark current)

Process to produce 35MV/m cavities now established and Process to produce 35MV/m cavities now established and well understoodwell understood• Quality control required already exceeded by standard industry Quality control required already exceeded by standard industry

practisepractise Dark current under control Dark current under control Pagani Pagani XFEL activity rapidly ramping up XFEL activity rapidly ramping up Brinkmann Brinkmann

Documents

TTF-II Status & Prospectives Nick Walker DESY 5 th ITRP Meeting – 28.06.04 CALTECH