UK Neutrino Factory Meeting Front End Test Stand (F.E.T.S.) Engineering Status by P. Savage 22nd April 2009

Slide 2 of 34 Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics 1.Laser Based Beam Profile Measurement Tank 2.L.E.B.T. assembly 3.R.F.Q. Concept developments 4.Pepperpot Emittance Measurement System

Slide 3 of 34 Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics 1) First Tank Laser Based Beam Profile Measurement

Slide 4 of 34 Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics Position 1 Position 2 Position 3 Laser Ion Beam BEAM PROFILE MEASUREMENT SYSTEM

Slide 5 of 34 Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics BEAM PROFILE MEASUREMENT SYSTEM Vacuum Linear Stage Vacuum Rotary Stage Mirror to deflect laser

Slide 6 of 34 Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics 2 linear drives, each with an attached rotary drive mounted to a back plate in the vertical position. BEAM PROFILE MEASUREMENT SYSTEM CONCEPT

Slide 7 of 34 Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics Now the horizontal linear / rotary drive pairs have been added to the motor chassis BEAM PROFILE MEASUREMENT SYSTEM CONCEPT

Slide 8 of 34 Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics A tunnel has been placed between the horizontal drives, this volume will be pumped separately from the main vessel and will contain diagnostics. BEAM PROFILE MEASUREMENT SYSTEM CONCEPT

Slide 9 of 34 Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics The detector has been added to the differentially pumped tunnel. BEAM PROFILE MEASUREMENT SYSTEM CONCEPT

Slide 10 of 34 Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics... And the tunnel has been closed and extended with sprung ends to mate with the internal faces of the containing vessel. BEAM PROFILE MEASUREMENT SYSTEM CONCEPT

Slide 11 of 34 Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics BEAM PROFILE MEASUREMENT SYSTEM Door Chassis Motor Chassis CONCEPT

Slide 12 of 34 Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics Faraday cup is isolated from ground. Thin fabricated copper jacket is at 2kV to accelerate the electrons. 100 Amp turns onto soft iron yoke. Soft iron (permeability = 600) dipole is at ground potential. BEAM PROFILE MEASUREMENT SYSTEM

Slide 13 of 34 Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics Motor chassis Door chassis Detector Vacuum vessel BEAM PROFILE MEASUREMENT SYSTEM 200mm Laser in Laser out

Slide 14 of 34 Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics BEAM PROFILE MEASUREMENT SYSTEM Laser in Laser out Beam Vacuum Pumps 3 x 800 l/s Faraday cup assembly / beam stop Sub-D feed-through panel for linear and rotary motors BNC feed-through flange for detector

Slide 15 of 34 2) L.E.B.T. Low Energy beam Transport Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics

Slide 16 of 34 LOW ENERGY BEAM TRANSPORT Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics Solenoid

Slide 17 of 34 Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics Solenoids Beam direction First tank Down stream wall LOW ENERGY BEAM TRANSPORT L.E.B.T. support frame Solenoid / drift vessel support bridges x4

Slide 18 of 34 Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics Drift vessel Beam pipe sections Flexible bellows Support and alignment structures x 4 Drift lengths: d1 = 25cm d2 = 13.5cm d3 = 35cm d4 = 17cm LOW ENERGY BEAM TRANSPORT

Slide 19 of 34 TITLE Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics L.E.B.T. FARADAY CUP / BEAM STOP Faraday cup / beam stop assembly Pneumatic linear feed- through mechanism

Slide 20 of 34 Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics An assembly of front plate (at ground) (1), secondary electron suppression ring (2) and faraday cup (3) all mounted to a cooled stainless steel welded assembly(4). The complete assembly can move downwards out of the beam path Toroid Toroid casing Mu metal shield Beam pipe seal Electrical feed- through x 6

Slide 21 of 34 Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics What is next for the LEBT development? a)Install L.E.B.T. beam pipe sections and drift vessel, attach pump and conduct vacuum test. b)Finalise design for L.E.B.T. drift vessel toroid and cooled faraday cup/beam stop assembly.

Slide 22 of 34 Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics 3) R.F.Q. Radio Frequency Quadrupole

Slide 23 of 34 Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics 324 MHz Four Vane R.F.Q. To accelerate H - beam from 65keV to 3Mev An R.F.Q. consists of: Copper structure Vacuum tight Vane tip modulations Cooling channels Tuners RF coupling Vacuum ports Support / alignment structure

Slide 24 of 34 Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics PLUG TUNER Currently working on the design of the plug tuners. Each 1m RFQ section may have perhaps 20 static plug tuners and 1 dynamic plug tuner.

Slide 25 of 34 Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics PLUG TUNER Cooling pipes ‘O’ ring groove Copper plug Stainless steel insert Braze interfaces

Slide 26 of 34 Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics DYNAMIC PLUG TUNER ASSEMBLY The plug tuner is mounted to a linear feed-through mechanism that maintains a vacuum seal by using an edge welded bellows. The model shown here has 50mm of travel and is driven by a stepper motor. Stepper motor Bellows

Slide 27 of 34 Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics PLUG TUNERS ATTACHED TO ONE RFQ SECTION So already the basic RFQ structure becomes cluttered and this is before including provision for vacuum, RF and support / alignment.

Slide 28 of 34 Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics What is next for the RFQ development? a)Finalise static and dynamic tuner design for the RFQ. Manufacture prototype plug assembly and send for vacuum brazing to test joint design. b)Design in remaining RFQ features including the vacuum ports, RF coupling section and support/alignment framework. c)Choose RFQ assembly technique and make test assemblies to check joint quality.

Slide 29 of 34 4) Pepperpot A device for measuring beam emittance Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics

Slide 30 of 34 Close up of the assembled grid head showing the quartz plate. PEPPERPOT Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics

Fast CCD camera H- beam Exploded view of grid head PEPPERPOT Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics

Slide 32 of 34 What is next for the Pepperpot system? Mount the system inside a vacuum vessel that can be positioned at any longitudinal position on the FETS. In addition to pepperpot measurement the vacuum vessel will allow for slit-slit measurements. Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics

Slide 33 of 34 Goal for this year To have a working H - beam that is transported through the first laser based diagnostic vessel, through the LEBT and then through a range of diagnostics including a toroid, a slit-slit scanner or a pepperpot head before finally hitting the beam stop. To have a complete design for the RFQ and associated peripherals. Ion Source Chopper L.E.B.T. R.F.Q. Diagnostics

THANK YOU Any questions?