Linac-4 current situation and outlook

Linac-4 current situation and outlook

U. Raich, F. Roncarolo, F. Zocca

BI Technical Board 2

Current situation• Transformers: First equipment to be operational. Very stable. Watchdog still to be

included in beam interlock system• SEMGrids: Many tests were needed to determine the correct polarization

voltages for frame and wires. We sometimes see the FESA class with software trigger instead of external trigger

• Wire Scanners: Initial problems with motor movement. Now stable• Emittance Meter: Several problems with motor movement. At the moment stable

and operational. Measured emittance is too small as compared with simulations.• BSM: Had some problems with external RF reference and wire movement. Looks

ok now. However only few measurements after installation in the tunnel since buncher became available only recently

• BPMs: Need still some work. First position measurement were done. Phase measurements still to be tested. At the moment we only have 2 BPMs

• Halo monitor: Not installed at the moment.

2/27/2014


A few screen shots from the logbook

2/27/2014

BI Technical Board 42/27/2014

Recent Measurements from BSMs


Profile and Emittance Measurements with Laser

2/27/2014


Laser

First Laser tests with Diamond detector measuring the neutrals

2/27/2014


Angle profile for 1 laser position

2/27/2014


Laser Outlook

• No budget was foreseen for laser stripping • Need to buy Laser + diamond strip detector• Will allow to measure emittance parasitically

on the operational beam at 160 MeV

2/27/2014


To be finished at 3 MeV

• Adjustment of bunchers– This is currently done using the spectrometer and

the BSM• The BSM software to

be integrated intocontrol system

2/27/2014


Planning

2/27/2014


Next step

• Installation of the first DTL tank.• Move the measurement line after the DTL

tank• Re-cable and re-commission all devices

(except spectrometer)• Repeat measurements at 12 MeV• No new devices!

2/27/2014


New measurement line at 50/100 MeV

• 3 BPMs will be recuperated from the 3 MeV line• 1 Transformer recuperated from the 3 MeV line• The wire scanners & grid tanks for the intertank regions

are fabricated• 3 new tanks with hor/ver SEMGrid + wire scanner

These tanks were expected to be ready by June but will be delayed until September

• BSM recuperated from 3 MeV lineCables for SEMGrids and WS will be pulled back (use CCDTL cables)BPM and transformer cables are availableBSM prolongation cable is available

2/27/2014


Still missing from the list

• BPMs for inter-tanks (DTL ones ready, all will be ready by July)

• Transformers after DTL CCDTL and PIMS (ready)• Wire Grids and wire scanners for inter-tanks

(last information I have says ok but must check again)

• BLMsAll should be ready by the end 2014

2/27/2014


BPMs for the inter-tank

2/27/2014


Summary

• Transformers, wire scanners, wire grids and BSM have been commissioned

• No big problems are expected for the devices to be installed.

• BPMs need further work at the electronics level• Tanks for Grids and WS at 100 MeV are late

Dates for the inter-tank grids and WS to be verified

• BSM needs software integration (not too urgent)2/27/2014

Linac-4 current situation and outlook

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