Test stand activities jan 2021 A Lombardi Most

Test stand activities jan 2021 A. Lombardi

Most used configuration : replica of the low energy beam transport in LINAC 4 tunnell Souce : 45 k. V 2 Steeres 2 Solenoids Alessandra Lombardi 28/01/2021 2

In the test stand we have the same active elements but more diagnostics Alessandra Lombardi 28/01/2021 3

The mask in practice A set of four plates with square holes, distances given by shims and a Faraday cup. BEAM Alessandra Lombardi 28/01/2021 4

The mask can be replaced by a system to irradiate a target for material/high voltage studies

90° 40 mm Jérôme Humbert, Didier Steyaert 30 mm 15 mm between sample surface and external plane of flange -> 14 mm between sample surface and inner face of the gasket

Position mm Aperture diameter mm Source ground -195 8 mm solenoid 215 100 mm steerer 434 100 mm 9, 00 E+01 Pre-chopper 936 100 mm 8, 00 E+01 steerer 1340 100 mm Sector valve 1443 solenoid 1690 100 mm Transition and collimator 1935 To 40 mm or less Flange 1955 Target to irradiate 2021 1970 Nominal beam dynamics 4 rms beam radius mm vs distance in the LEBT m 7, 00 E+01 6, 00 E+01 5, 00 E+01 4, 00 E+01 3, 00 E+01 sol 90, 110 -nomi sol 90, 89 -underfocused 2, 00 E+01 1, 00 E+01 0, 00 E+00 5, 00 E-01 1, 00 E+00 1, 50 E+00 2, 00 E+00 Alessandra Lombardi Beam size at the target can be changed from 2 -3 mm to 2 -3 cm 28/01/2021 2, 50 E+00 7

Nomi configuration just before the target 40 mm Alessandra Lombardi 28/01/2021 8

16 October 2020 - source 220 volume mode 80 mm across

With collimator Easy mounting Aperture can be tailored to needs We can record the current that falls on the collimator and on the target 30 mm Alessandra Lombardi 28/01/2021 10

First a niobium target – 10^19 H-

Compare with expectation In blue what we expect from simulations. Solenoids 91, 112. 7 It matched well with what we expect. Black marks?

March 2020 – for memory • https: //indico. cern. ch/event/897095/contributions/3783577/attach ments/2003251/3345152/Copper_collimator_beam_tests_20. 03. 202 0_em. pdf Located at the position of the electrode suppressor – 55 mm before the RFQ input plane

Very good agreement with expectation No strange shape Sol at 105, 87 or thereabout Check scaling of aperture but very close with expectation