ELENA transfer lines Glenn Vanbavinckhove, Wolfgang Bartmann, Dani - - PowerPoint PPT Presentation

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Jul 23, 2023 222 likes •593 views

ELENA transfer lines Glenn Vanbavinckhove, Wolfgang Bartmann, Dani Barna and Ranko Ostojic Many thanks to: Francois Butin, Olivier Choisnet, Damien Brethoux, Stephane Maridor, TE-ABT-BTP Discussions with people from the experiments

SLIDE 1

ELENA transfer lines

Glenn Vanbavinckhove, Wolfgang Bartmann, Dani Barna and Ranko Ostojic

Many thanks to: Francois Butin, Olivier Choisnet, Damien Brethoux, Stephane Maridor, TE-ABT-BTP

SLIDE 2

Discussions with people from the experiments
General integration overview
Full beam-line simulation
Error studies
Conclusions
Outlook

SLIDE 3

Discussions with people from the experiments:

–

AEGIS

–

ATRAP

Special thanks to: Michael Doser, Stephan Ettenauer

SLIDE 4

AEGIS

First proposal

Quadrupole Bend Monitor Corrector Handover point

SLIDE 5

3 4 1 m m 1 1 m m

AEGIS

Second proposal

Doublet moved before deflector

SLIDE 6

AEGIS

Final proposal

Doublet moved before + BPM corrector

SLIDE 7

ATRAP 1 & 2

First discussion with ATRAP:

–

First proposal of handover point, currently under discussion in the ATRAP collaboration

–

Request from ATRAP to have a “peephole”, currently being investigated

SLIDE 8

ATRAP 1 & 2

0.9 m 2.3 m 3.2 m Red current Blue proposed FLOOR 1.55 m 0.3 m ATRAP 1 0.6 m

SLIDE 9

General integration overview

– LNE50 – LNE00->LNE07 – Critical point around LNE07-LNE01-LNE50 – Future possible assembly

SLIDE 10

General integration overview

SLIDE 11

LNE50- GBAR

Longitudinal pickup BPM Doublet+ corrector 1.9m

SLIDE 12

LNE00-LNE07

Source LNE07 LNE01 LNE02 LNE05 LNE06 LNE03 LNE04 LNE00

SLIDE 13

Critical point LNE07-LNE01-LNE05

SLIDE 14

A possible future assembly

Currently 4 assemblies:

–

Singlet

–

Singlet + corrector

–

Doublet

–

Doublet+corrector

Proposed to go for one assembly:
All elements will be installed, but only active

elements will be connected (and have feed-troughs )

Quad Corrector Quad

SLIDE 15

A possible future assembly

Active Non-active T.b.d (see error studies)

SLIDE 16

Full beam simulation

SLIDE 17

Full beam simulation

Goal: independent check to see if simulation in

MADX is correct

Full beam simulation of a line was conducted in

Comsol and C++ (Runge–Kutta)

Comparison of the optics and voltages between

MADX and Comsol

First simulation has been conducted on a dummy

line, preliminary results are shown:

–

Next step → simulation for a complete line

→ including dispersion

SLIDE 18

Full beam simulation

Quad Voltage [Kv] 1

9.319

2 9.228 3

8.219

4 4.674

SLIDE 19

Error studies

Goal of the error studies
Assumptions
Lines used during the studies
Results: trajectory mismatch
Results: monitor reading error
Results: quadrupole misalignment
Results: all errors together
What if a monitor is installed at every monitor

SLIDE 20

Error studies

Goal of the error studies
Assumptions
Lines used during the studies
Results: trajectory mismatch
Results: monitor reading error
Results: quadrupole misalignment
Results: all errors together
What if a monitor is installed at every monitor

P r e l i m i n a r y

SLIDE 21

Goal of the error studies

To identify maximum misalignments of the monitors,

correctors, quadrupoles, bends,...

–

Current alignment of the BPM is 1-2 mm (M. Hori)

–

Quad displacement < 0.74 mm (D. Barna)

–

Quad rotation < 20 mrad (D. Barna)

–

Error on the voltage ~0.01 (J. Baillie)

–

Trajectory stability at extraction +/- 3 mm from AD (T. Eriksson, L. Bojtar)

SLIDE 22

Assumptions

No errors applied on fast deflectors and bends
Maximum trajectory deviation due to the error

applied should not exceed 10 mm in the lines.

Combined effect of the misalignments should be

less then 20

Assumption that trajectory correction for LNE00 +

LNE07 would be combined

SLIDE 23

Lines during the studies

SLIDE 24

Results (Trajectory mismatch)

SLIDE 25

Results (Monitor reading error)

SLIDE 26

Results

Quadrupole misalignments (horizontal plane)

Up to 30% error on the optics → beam size could be between 0.7 & 1.3 mm (ignoring dispersion, similar effect)

SLIDE 27

Results

Quadrupole misalignments (vertical plane)

For the beam size calculation we assumed at 20% optics error

SLIDE 28

Results (All misalignments + trajectory fluctuation + reading error)

SLIDE 29

What if a monitor is installed at every assembly?

For LNE00+LNE07 this means an

increase from 6 to 11 monitors (46% increase)

In most cases the extra monitors are

being installed at the defocussing quad

SLIDE 30

What if a monitor is installed at every assembly?

SLIDE 31

Conclusions

Integration
Error studies

SLIDE 32

Conclusions

Integration

Integration has been started:

–

First implementation of the different elements in the ELENA transfer lines

–

First feedback has been provided and have let to several minor changes

Discussing with AEGIS & ATRAP provided us with

valuable feedback:

–

AEGIS line has been adjusted to provide more space for a possible pulse drift tube

–

ATRAP handover point is currently under discussion

Full beam simulation comparison between

Comsol/c++ and MAD is showing promising results.

SLIDE 33

First preliminary error studies for the

combined LNE00+LNE07 were conducted:

–

1-2 mm monitor alignment is not sufficient, target alignment for monitor should be < 1 mm

–

Results will be be used to re-evaluate the location of monitors/correctors and add an extra monitor/corrector where needed

Installing a monitor/correction assembly at

every monitor is in current setting only beneficial for vertical plane, maybe alternating?

Conclusions

Error studies

SLIDE 34

Outlook

SLIDE 35

Outlook

Continue with integration of the transfer lines:

–

Currently at version 4 for the lines

Discussions with people from the other

experiments will start soon

Systematic error studies:

–

All lines

–

Define limits for alignments tolerances of the different elements

–

Define limit for alignment (internal & external) for the monitors

SLIDE 36

The end

(thanks for the last two years … !)