C. Rossi – L4 Project Meeting 3 March 2011 Status and Plans of 3 MeV Test Stand.

C. Rossi – L4 Project Meeting 3 March 2011

Status and Plans of3 MeV Test Stand


The 3 MeV Test Stand is installed in the PS South Hall extension (building 152)


Activities at the Test Stand in 2010Source Operation

Impossible to operate the ion source with H- at 45 kV extraction voltage

Characterize the source for p extraction at 45 kV to allow RFQ and partial MEBT commissioning


Activities at the Test Stand in 2010Source Results with protons

0 200 400 600 800 1000 12000

5

10

15

20

25

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35

40

f(x) = 0.034941351888668 x + 2.70412524850895

Simulated Beam Size @ the SEM vs Espread

Input Energy spread (ev)

Beam

siz

e at

SEM

(mm

)

Slit : 1mmSol : 600 A

10 12 14 16 18 20 22 24 26 28 300

5

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15

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30

35

Spectrometer current [A]

Fara

day

cup

curr

ent

[mA

]

20 25 30 35 40 45 50 55 6005

10152025303540

RF-power [kW]

Fara

day

cup

curr

ent

[mA

]

The energy spread of the beam is not larger than 400 eV (50 eV per mm) => ± 200 eV => ± 0.4 %

Pictures from O. Midttun’s presentation

Slit 1 mmSol 600 A


Activities at the Test Stand in 2010MEBT line completed

With 3rd buncher cavity


Activities at the Test Stand in 2010RF installation progress

2nd buncher amplifier installed


Activities at the Test Stand in 2010PIMS prototype tested


Activities at the Test Stand in 2010PIMS prototype tested

day TRF com. Ppeak Tpulse vacuum X-ray axis X-rayext

2010 [h] [μs] [mbar] [mSv/h] [μSv/h]

23.11. klystron running stable, thermal test started

23.11. 24 1100 kW 760 5 ·10-7 400 180

24.11. 24 1100 kW 800 4 ·10-7

25.11. 18 1100 kW 800 4 ·10-7 320 111

Nominal gradient of 4 MV/m reached with 700 kW

Table courtesy of R. Wegner


Activities related to the Test Stand in 2010Movable Test Bench

Design of Test Bench completed;Design of all components completed;Fabrication started for all components;Start of assembly in May.


Characterize the beam properties at 3 MeV:

•At the RFQ exit in the Linac4 Test Stand (late 2011 and beginning of 2012)•At the chopper line output in the Linac4 Test Stand (during 2012)

•At the chopper line output in the Linac4 Tunnel (early 2013)

Characterize the beam properties at 12 MeV:

•At the DTL tank1 output in the Linac4 Tunnel (first half 2013)

Transverse plane Longitudinal plane

Beam profiles Beam emittances Beam position Transverse halo

Transmission Average beam energy Energy spread Bunch shape profile Chopping efficiency (time resolved and integrated)

From: G. Bellodi - User Specification for Linac4 Test Bench Diagnostics

Activities related to the Test Stand in 2010Movable Test Bench


Activities related to the Test Stand in 2010RFQ fabrication and measurement


Module 1 completely brazed, final machining still to be performed:



Module 3 passed 1st brazing, now is being machined for 2nd brazing.



Planning to RFQ completion


RF measurement step week

T2 after assembly 14-15 (2/04)

T2 after 1st brazing 19-20 (9/05)

T3 after 2nd brazing 19-20 (9/05)

T2 after 2nd brazing 29-30 (18/07)

RFQ assembly 35-36 (1/09)

Fittings (tuners, power coupler, end plates) tbd

RFQ completely assembled as from 44 (31/10)


• Continue measurements and development of the ion source;

• Complete the infrastructure for the RFQ and Movable Test Bench installation (cabling, cooling);

• Perform the interlock system installation;

• Assemble the Movable Test Bench;

• Complete equipment installation (buncher amplifier(s), LLRF equipment, beam diagnostics, power supplies);

• Equip the control room;

• Perform the RFQ final tuning;

• Perform the RFQ RF commissioning.

The Test Stand equipment will be moved to Linac4 at the beginning of 2013.

Activities at the Test Stand in 2011

C. Rossi – L4 Project Meeting 3 March 2011 Status and Plans of 3 MeV Test Stand.

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