MEW Meeting 07102019 Nathan Roche 02032021 MEW Meeting

MEW Meeting 07/10/2019 Nathan Roche 02/03/2021 MEW Meeting 1

Some nosecone designs Podgoršak E. B. (2016) Waveguide Theory. In: Radiation Physics for Medical Physicists. Graduate Texts in Physics. Springer, Cham 02/03/2021 MEW Meeting 2

Some nosecone designs Podgoršak E. B. (2016) Waveguide Theory. In: Radiation Physics for Medical Physicists. Graduate Texts in Physics. Springer, Cham 02/03/2021 MEW Meeting 3

Some nosecone designs (a) the optimized cell-design for X-band linac with irisdiameter of 2. 6 mm with the electric field plot, and (b) a plot of the surface electric and magnetic fields for the accelerator cell. Podgoršak E. B. (2016) Waveguide Theory. In: Radiation Physics for Medical Physicists. Graduate Texts in Physics. Springer, Cham 02/03/2021 Distributed Coupling Accelerator Structures: A New Paradigm for High Gradient Linacs - Tantawi, Sami et al. ar. Xiv: 1811. 09925 [physics. acc-ph] MEW Meeting 4

A new parameterisation • Can a new parameterisation of the nosecone design offer greater control over our constraints/objectives? • Surface Electric field minimisation, • Surface Magnetic field minimisation, • Shunt-impedance maximisation, • etc. • From such a parameterisation we ideally want to be able to readily select our requirements, changing a few parameters to achieve a specific design i. e. one which offers high gradients, high efficiency, etc. 02/03/2021 MEW Meeting 5

Hyperbolic-Tangent Ellipse Biarc • A curve which may offer such flexibility is the Hyperbolic-Tangent. 02/03/2021 MEW Meeting 6

Hyperbolic-Tangent Ellipse Biarc • A curve which may offer such flexibility is the Hyperbolic. Tangent. • Changing the parametric function gives us something slightly more familiar. • However there is still little semblance to an accelerating cavity… 02/03/2021 MEW Meeting 7

Hyperbolic-Tangent Ellipse Biarc • It may be a good idea to add an ellipse to produce something more reminiscent of a nosecone. 02/03/2021 MEW Meeting 8

Hyperbolic-Tangent Ellipse Biarc • In order to have as flexible a parameterisation as possible we must find a function which describes a biarc between these curves. 02/03/2021 MEW Meeting 9

Hyperbolic-Tangent Ellipse Biarc • In order to have as flexible a parameterisation as possible we must find a function which describes a biarc between these curves. • In other words we must find a function giving equivalent gradients, 02/03/2021 MEW Meeting 10

Hyperbolic-Tangent Ellipse Biarc • 02/03/2021 MEW Meeting 11

Hyperbolic-Tangent Ellipse Biarc • 02/03/2021 MEW Meeting 12

Hyperbolic-Tangent Ellipse Biarc • 02/03/2021 MEW Meeting 13

HTEB nosecone parameterisation • 02/03/2021 MEW Meeting 14

HTEB nosecone parameterisation • -0. 15 0. 05 0. 1 0. 3 0. 05 20 02/03/2021 MEW Meeting 15

HTEB nosecone parameterisation • -0. 15 0. 21 0. 0001 0. 05 0. 0002 02/03/2021 MEW Meeting 16

Housekeeping Exercises • Implemented VHEE_BP 2 in CST • Accelerating frequency = 11. 9941 GHz • 215, 000 Tetrahedra • Will do further simulations over the coming weeks, transferring move STEP files from HFSS and some benchmarking therein (Superfish, HFSS, CST). 02/03/2021 MEW Meeting 17

Housekeeping Exercises • Very brief document on the license server set-up for Ansys. • Needs to be uploaded. • Computing: • Dirac occasionally becomes stuck on home-screen. • Various computers of ‘days gone by’ full of RAM and disk drives which can be harvested for the Greater MEW. • Big re-networking of all the machines in Schuster Room 7. 25. 02/03/2021 MEW Meeting 18

Upcoming Events • 24 th October 2019 • IOP physics spotlight: Machine learning in accelerator physics. [FREE PABG WORKSHOP] • Deadline for registration 11 th October. • 30 th October 2019 • CI postgraduate conference: Present poster, free pizza, some free beer of variable provenance. • 9 th – 13 th March 2020 • CLIC Workshop. 02/03/2021 MEW Meeting 19

Today, Tomorrow, Next Week • Power: • Review of beam power, power dissipation in cavity, power coupling methods and sources. • Begin poster for CI PG conference & Manchester postgraduate poster event, potential for 3 VHEE posters, maybe 5? • VHEE_BP 2 simulations: • Dispersion curves (bandwidths, π/2 frequencies), Q-values, E-fields, H-fields, Rs/Q, Shunt Impedance Rs, Q/dq/dk, Power dissipation calculation in HFSS. • Multi-cell structure: • HFSS Calculations for Multi-cell. 02/03/2021 MEW Meeting 20