LINAC3 UPGRADE Source and LEBT modifications for YETS 2015-6 and recommissioning timetable 28/10/2015 Ville Toivanen.

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Presentation transcript:

LINAC3 UPGRADE Source and LEBT modifications for YETS and recommissioning timetable 28/10/2015 Ville Toivanen

Introduction Linac3 upgrade motivation and goals Mitigate the beam losses taking place immediately downstream from the ion source Improve ion source tuning flexibility by decoupling ion production and beam transport in the extraction region Implementation Relax aperture restrictions in the beginning of the LEBT Install a new focusing element, an einzel lens, downstream from the existing GTS-LHC extraction electrodes Draft of the Linac3 upgrade ECR: EDMS

Linac3 LEBT Region of interest GTS-LHC beam extraction system Extraction chamber 1 st LEBT beam pipe through SOL01 2 nd LEBT beam pipe with bellows Gate valve ITL.VVS10 + einzel lens

Existing GTS-LHC extraction region 65 (1)Ion source body (2)Extraction electrodes (3)Fixing point (flange) for extraction electrodes (4)Extraction chamber

Existing LEBT section through the first solenoid GTS-LHC (pumping chamber) 1 st diagnostics chamber Spectrometer Ref.: LICLM___0231 (First pipe (1) incorrect, should be LICLM___0245) 320 ~ SOL1 ~58

LINAC3 MODIFICATIONS

New extraction chamber -Input port: From 100 mm pipe + ISO-F DN100 (3,4) to 138 mm pipe + DN150CF (7,8) -Output port: From 65 mm pipe + DN63CF (1,2) to 100 mm pipe + DN100 Quick CF (5,6) -Internal plate for wire protection removed (wires protected by einzel lens)

New einzel lens Ti and MACOR lens assembly New SS flange

New beam pipes From 65 mm to 100 mm bore pipes One flange of the pipe going through SOL01 welded on-site

New electrical connections + power supply New HV power supply for the einzel lens, installed in the rack next to the existing extraction PSs Einzel and existing extraction system cabling through a new T- piece on the side of the extraction chamber Cabling (done by us): HV cable for einzel Control cables for einzel PS Vacuum side with Kapton coated UHV compatible cable EinzelIE Extraction chamber Pb shielding

Einzel voltage stabilization If beam loading on the lens, a capacitor may be required to stabilize the voltage during beam pulse Operation with beam will show if needed or not Preparations made to realize such a system

Controls Hardware: a new PLC remote station (no CPU) Einzel lens control Existing source HV controls Software: Einzel lens voltage control to the ion source FESA class Control available in the ion source knob in INCA

Source control hardware at Linac3

Current situation Design work has been completed Production is going on at the workshop – parts will be delivered in December Off-the-shelf items have been ordered and most of them have been received Einzel PS will be delivered in November Control system hardware expansion is under way

RECOMMISSIONING TIMETABLE

Pepperpot?

ADDITIONAL SLIDES

Ions schedule

Proposed schedule Based on technical meeting held on 11/3/2015 Present: Didier Steyaert, Pierre Moyret, Alice Michet, Detlef Küchler, Ville Toivanen Time requirements set for mechanical design and manufacturing Adjusted to allow installation in the first quarter of 2016 First deadline: Optical design, end of May 2015 Einzel lens geometry definition with extraction simulations Simulation study to define LEBT transmission and beam matching to the RFQ with the modifications LIU IONS Linac3 meeting 18/3/2015