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The 3 MeV H - Test Stand at CERN - The first part of the SPL - H. Haseroth PowerPoint PPT Presentation


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The 3 MeV H - Test Stand at CERN - The first part of the SPL - H. Haseroth on behalf of the SPL Study Group (Prepared by Carlo Rossi). The 3 MeV H - Test Stand at CERN. OUTLINE The long term SPL project : motivation for a 3 MeV Test Stand.

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The 3 MeV H - Test Stand at CERN - The first part of the SPL - H. Haseroth

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The 3 mev h test stand at cern the first part of the spl h haseroth

The 3 MeV H- Test Stand at CERN

- The first part of the SPL -

H. Haseroth

on behalf of theSPL Study Group

(Prepared by Carlo Rossi)

H. Haseroth

July 26 – August 1, 2004 NuFact04, Osaka


The 3 mev h test stand at cern

The 3 MeV H- Test Stand at CERN

OUTLINE

  • The long term SPL project: motivation for a 3 MeV Test Stand.

  • The intermediate Linac4 phase: a valuable improvement of the CERN proton accelerator complex.

  • The 3 MeV Test Stand: a short term study tool and the future SPL Front End.

  • Status and Planning.

H. Haseroth

July 26 – August 1, 2004 NuFact04, Osaka


Spl a long term project

SPL: a long term project

A multi-MW superconducting linac could simultaneously satisfy the needs of many users. Especially relevant are the potential applications* for:

  • Radio-active ions

  • Neutrinos: super-beam/beta-beam/neutrino factory

  • LHC: potential to increase the brightness and intensity beyond the ultimate beam.

    The challenge for high beam power is mostly coming from the control of beam halo. The control starts from the low energy end. A test bench for beam dynamics studies (including beam halo) is a must.

*Debated at the workshop on “Physics with a multiMW Proton Source”, CERN, May 25-27, http://physicsatmwatt.web.cern.ch/physicsatmwatt/

H. Haseroth

July 26 – August 1, 2004 NuFact04, Osaka


Spl block diagram cdr 1

SPL block diagram (CDR 1)

Linac 4:up-to-date design

Superconducting linac:CDR 1

H. Haseroth

July 26 – August 1, 2004 NuFact04, Osaka


Linac4 a mid term phase

Linac4: a mid-term phase

Linac4 is the room-temperature section of the SPL (extended to 160 MeV), intended to upgrade the injection into the PS Booster.

It allows for a significant performance improvement for the present users like LHC and ISOLDE, at a limited cost.

H. Haseroth

July 26 – August 1, 2004 NuFact04, Osaka


Linac4 parameters

Linac4 parameters

Linac4 could be laterused as front-end of the SPL: its RF structures are designed to operate at the full SPL duty cycle.

  • Relaxed parameters

  • Space and infrastructure available in the PS South Hall

  • RF from LEP (klystrons, waveguides, etc. - already in stock)

H. Haseroth

July 26 – August 1, 2004 NuFact04, Osaka


Linac4 layout

95keV

3MeV

40MeV

90MeV

160MeV

H-

RFQ

MEBT

DTL

CCDTL

SCL

IPHI

RFQ

6 m

1 klystron

chopping

line

3.6 m

Drift Tube

Linac

352 MHz

16.7 m

3 tanks

5 klystrons

Cell-Coupled Drift Tube L.

352 MHz

30.1 m

33 tanks

6 klystrons

Side Coupled

Linac

704 MHz

28.1 m

20 tanks

5 klystrons

30 mA, 0.1% duty

Final Energy 160 MeV,

factor 2 in bg2 w.r.t. present 50 MeV Linac2

Total Linac4: 86.5 m , 17 klystrons

Linac4 layout

H. Haseroth

July 26 – August 1, 2004 NuFact04, Osaka


Installation layout

Installation Layout

3 MeV

Test Place

H. Haseroth

July 26 – August 1, 2004 NuFact04, Osaka


The 3 mev test stand

The 3 MeV Test Stand

Specific Components

Chopper structure

H- ECR ion source

IPHI RFQ

Bunching cavities

HV pulsed power supplies for the LEP klystrons

Beam Shape and Halo Monitor

H. Haseroth

July 26 – August 1, 2004 NuFact04, Osaka


The 3 mev test stand1

The 3 MeV Test Stand

  • Beam dynamics at low energy.

  • Development of the Chopper line:

    • to generate the required time structure of the beam

    • to clean the beam from halo

    • to match it to the subsequent RF structures.

H. Haseroth

July 26 – August 1, 2004 NuFact04, Osaka


The h ecr source

The H- ECR Source

Tests on the prototype source are under way. Design work will be carried out during the rest of 2004 and 2005.

The final source is not expected before 2007.

H. Haseroth

July 26 – August 1, 2004 NuFact04, Osaka


The rfq

The RFQ

TheIPHI (“Injecteur de Protons de Haute Intensité”) RFQ is at the core of the 3 MeV Test Place. Itis being developed in France within the IPHI collaboration between CEA and CNRS which CERN has recently joined .

RF power is generated by a LEP klystron (352.21 MHz, 1 MW CW) that will be operated in pulsed mode, by means of dedicated power supplies expressly developed by a collaboration between GSI and CERN.

H. Haseroth

July 26 – August 1, 2004 NuFact04, Osaka


Hv pulsed power supplies for the lep klystron

HV Pulsed Power Supplies for the LEP klystron

CERN and GSI are formalizing an agreement for the development of the power supplies based on common requirements (Linac4 @ CERN and FAIR injector @ GSI).

First power supply to be delivered before end 2005, second before end 2006.

H. Haseroth

July 26 – August 1, 2004 NuFact04, Osaka


The chopper line

The Chopper line

General guidelines

Compact design3 m length

Dynamic range20 – 60 mA

Small e growthez = const

erout = 1.17 erin

Tolerant to alignment errors

Good vacuum~10-8 Torr

H. Haseroth

July 26 – August 1, 2004 NuFact04, Osaka


Beam dynamics in the chopper line

Beam Dynamics in the Chopper Line

The chopper line is designed transversely as five FODO periods, while longitudinally three RF cavities match the beam from the RFQ output to the (future) DTL input.

Chopper

structure

Chopper

structure

RFQ

output

DTL

input

Buncher

cavity

Buncher

cavity

Buncher

cavity

H. Haseroth

July 26 – August 1, 2004 NuFact04, Osaka


Beam chopping 1

Beam Dump – Side view

Water

~ 100 mm

Un-chopped beam

a

3 bunches

are dumped

5 bunches

are transmitted

Vacuum flange

Water

a = 10 degrees

Beam Chopping (1)

A beam dump has been designed to intercept the deviated beam 1 m downstream from the last chopper structure (radial separation between the beam centers: 1.5 cm)

H. Haseroth

July 26 – August 1, 2004 NuFact04, Osaka


Beam chopping 2

Beam Chopping (2)

2 ns rise/fall time is required for bunch selectivity (352 MHz beam structure), ±500V between the deflecting plates to get the required separation at the dump.

Double meander structure on Alumina substrate

The prototype of the RF amplifier is under test

The first chopper structure is under fabrication

Pulse length: 8ns to 2ms

Rep. rate (max): 45 MHz

H. Haseroth

July 26 – August 1, 2004 NuFact04, Osaka


Longitudinal matching

Longitudinal matching

The longitudinal matching is performed by 3 RF cavities working at 352 MHz: two with 30 mm aperture (B30), and one with 40 mm aperture (B40) placed in the chopping region.

B30B40

Frequency (MHz)352.0352.0

Gap length (mm)14.014.0

Q value2500024000

Shunt impedance (MW)1.280.64

R/Q52.227.1

Nominal voltage (kV)140100

Dissipated power (kW peak)1616.2

Kilpatrick factor1.221.16

The electromagnetic and mechanical design has been completed for the whole set of RF cavities. The construction phase for the first B30 cavity is starting and will be completed within the end of 2004.

H. Haseroth

July 26 – August 1, 2004 NuFact04, Osaka


The beam shape halo monitor

The Beam Shape & Halo Monitor

Longitudinal measurement

Measure residual H- in (not completely) chopped buckets with a sensitivity of ~ 1000 ions, in the vicinity of full bunches (108 ions).

Detector must be turned ON/OFF within 1 ns, gating ratio 1:106

Transverse measurement

Halo diagnostics: Beam core: d=1 cm, 108 H- /bunch/ cm2

Beam halo: d=4 cm, 103H- /bunch/ cm2

Active area of detector 4 × 4 cm

Dynamic range: 1:106 by integrating over several buckets

All components have been delivered. The vacuum chamber is being designed. The detector will be commissioned during the first months of 2005.

H. Haseroth

July 26 – August 1, 2004 NuFact04, Osaka


Measurement program

Measurement Program

The 3 MeV test place will be used to commission the different components of the line and perform “conventional” measurements on the beam, in order to scan the full dynamic range of the system.

Three sets of measurements have particular relevance:

Validation of the Chopper principle and hardware

Characterize the separation capability (on/off) of the chopper line (chopper voltage) and its time selectivity (rise and fall time).

Beam matching properties of the line

Measure longitudinal and transverse emittance (expected accuracy within 10%) within different beam conditions.

Halo studies

Optimize the collimation system by characterizing the beam halo in shape and intensity.

H. Haseroth

July 26 – August 1, 2004 NuFact04, Osaka


Planning of the project

Planning of the Project

Test of Linac4 RF structures is possible

Linac4

approval

Decision

on SPL

H. Haseroth

July 26 – August 1, 2004 NuFact04, Osaka


Status of the project

Status of the Project

  • The European Union is supporting beam dynamics studies and RF system developments in the frame of the HIPPI “Joint Research Activity”.

  • The design of the 3 MeV Test Stand is almost completed. Still missing:

    • study of the beam current monitor

    • design of the vacuum chamber (short sections between major components)

  • The design of the major components will be completed in 2004.

  • The start of Linac4 construction in 2006 has been included by the CERN DG among the strategic priorities of the laboratory  The 3 MeV Test Stand is being designed to become the Linac4 Front End.

H. Haseroth

July 26 – August 1, 2004 NuFact04, Osaka


The full picture

CDR 2

3 MeV test place ready

RF test place ready

Linac4

approval

SPL

approval

LHC

upgrade

The full picture …

H. Haseroth

July 26 – August 1, 2004 NuFact04, Osaka


The 3 mev h test stand at cern the first part of the spl h haseroth

Thank you

and Carlo Rossi for the preparation

of this presentation

H. Haseroth

July 26 – August 1, 2004 NuFact04, Osaka


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