The Stripping Foil Test Stand in the Linac4 Transfer Line R. Noulibos, P. van Trappen, W. Weterings CERN, European Organization for Nuclear Research,

The Stripping Foil Test Stand in the Linac4 Transfer Line

R. Noulibos, P. van Trappen, W. WeteringsCERN, European Organization for Nuclear Research, CH-1211 Geneva 23, Switzerland

3The Stripping Foil Test Stand in theLinac4 Transfer Line

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Stripping Foil Test StandA stripping foil test stand will be installed in the Linac4 transfer line allowing tests with a 160 MeV H− Linac4 commissioning beam:

• Testing from 2015, prior to final PSB installation (>2018)• The foil changing mechanism as well as the interlocking

functions can be assessed;• Gain experience with these very fragile foils;• Test different foil materials and thicknesses;• Evaluate the lifetime of the foils and foil holders;• Measure the stripping efficiency and emittance growth of

the beam through the stripping foil.

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BCT + BLM BCT

Profile Monitors Stripping Foil Test Stand Location

SourceDTLCCDTLPIMSDump

3 MeV50 MeV100 MeV160 MeV

Linac4 Layout


Layout & Instrumentation

• Stripping efficiency is measured by current decrease between cross-calibrated Beam Current Transformers (BCT) and by taking the electrical signal from the foil holder.

• Emittance growth is estimated using Secondary Electron Monitor (SEM) profile.

• The upstream defocusing quadrupole (QD) is used to vary the beam size.

Transfer Line to PSBTransfer Lineto PSB

QF QD


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Test possibilities• Stripping efficiency by measuring the BCT current before and

after the foil (resolution of 0.1 mA).• Beam losses at the level of few 109 protons are expected for

1014 H− nominal intensity from L4.• A rough estimate of the emittance growth through the stripping

foil could be obtained by using the SEM profile grids.• The PSB injection worst failure scenario can be simulated by

hitting the foil with a 400 µs pulse and minimum beam size.• Many mechanical cycles and movement of the foil, with and

without beam to test rigidity of different types of foils.• The BTV system will be tested, including correct filters selection

for beam measurements over a large range of beam intensities as well as the Foil – BTV screen interference interlock.



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Foil Handling Mechanism


Stepping motor

Magneticcoupling

Mirrors andOptical Filters

Radiation HardCamera

Foil Changer Beam ObservationSystem (BTV) with

Screen in BeamRear View

Showing mirror


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Stepping motor

Magneticcoupling



Foil Changer

Beam

Beam ObservationSystem (BTV) withScreen Retracted

Rear ViewShowing mirror


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Stepping motor

Magneticcoupling



Beam ObservationSystem (BTV) withScreen retracted

Foil ChangerVacuumChamber


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Final configuration to be installed in Linac4 transfer line (L4T)

sector 1.1


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Configuration L4T sector 1.1


To optimise intervention time and avoid foil damage due to differential pressure, the system is installed in a dedicated vacuum sector.

VacuumValve

VacuumValve

Beam Current Transformer (BCT)

Stripping Foil Test Stand

Beam

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The Stripping Foil Test Stand in theLinac4 Transfer Line

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Tunnel Location

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Tunnel Location

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Technology Department Blanc assembly – Required Space

~ 7 meter

~ 4

mete

r

Create the restricted environment with concrete blocks and/or wood panels

‘Mock-up’ dipoles in case BHZ are not available

Technology Department Blanc assembly – Minimum Space

~ 4 meter

~ 5

mete

r

‘Mock-up’dipoles ends

Create the restricted environment with concrete blocks and/or wood panels

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Mock-Up building 355

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STR mechanism prototype status

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R. Noulibos

- All parts manufactured and modified- Ready for 2nd assembly and tests

1104 mm Prototype progression 541.5 mm Foil Loader progression

- Most of parts manufactured - Ready for assembly and tests

January 2015

Courtesy of Remi GUEYDAN

- Prototype 1104mm has been completely dismantled

- Modifications have been done after tests

- Assembly has started for new tests in January 2015


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Study of Magnetic coupling replacement

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Magnetic coupling

Present Drive

Length : 80mmOutside diameter : 35mm

LHC BTVMechanism

Drive Study (in progress)

Length : 80mmOutside diameter : 35mm

Goal: overcome lack of precision due to magnetic drive

LHC BTVMechanism


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L4 STR test stand & HST Status

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STR for

Test Stand

STR for HST

_ All manufacturing drawings are all produced_ A few drawings to control


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STR test stand & HST Tanks

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With new shape for Inconel Chambers

_ Machining finished

_ Electron beam welding 1st week of January

_ Deadline : Dec. 2014 but…. dedicated milling machine breakdown 4 weeks


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STR test stand & HST tanks

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Flanges still to be machined


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STR test stand & HST Loaders

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_ Delivery of loader parts: 2nd week of January

_ Assembly ready for tests: 1st week of February

_ BI Mechanisms Delivery ?

Linac 4 Planning

• Commissioning phases contain• RF Conditioning• Connection of the beam line (vacuum , survey)• Hardware Tests (power converters, magnets)• LLRF calibrating• Beam Commissioning

2014-11-17 EDMS 1437718 J. Coupard EN-MEF 27

Installation Commissioning50 MeV

Commissioning100 MeV

Commissioning160 MeV

Reliability Run

Half Sector Test

5 months 4 weeks 5 weeks3 months 3 months

YETSReady for 50 MeV protons

https://espace.cern.ch/coordination-installation-linac4/


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STR Planning Jan 2015 :

• Tests of 1104mm band prototype improvements for precision• Assembly of Test stand & HST short loaders (541mm band)

Feb - Mar 2015 : • Lab tests with short loaders in L4 Test Stand vacuum tank

Apr 2015 : • Lab tests with BI instrumentation mechanism in L4 Test Stand

May 2015 : • Installation of STR Test Stand in Linac 4

Jun-Jul 2015 : • Lab tests with short loaders in L4 HST vacuum tank

Aug-Sep 2015 : • Installation of STR HST in Linac 4

Jan-Feb 2016 : • Tests of STR HST in Linac 4

16/12/2014

R. Noulibos

Documents

The Stripping Foil Test Stand in the Linac4 Transfer Line R. Noulibos, P. van Trappen, W. Weterings CERN, European Organization for Nuclear Research,