[Acc_sem_comm] Accelerator Seminar on May 3rd

[Tristan Jones]

GA,

F113 and L102 are unavailable on May 3rd at 11am, however they are available from 12pm -3 pm. I will book F113 for that time.

Tristan Jones
Administrative Support
Accelerator Ops, R&D
Jefferson Lab
tristan at jlab.org<mailto:tristan at jlab.org>
757.269.6330<callto:757.269.6330>
Room: ARC/704-1

From: Steve Benson <felman at jlab.org>
Sent: Wednesday, April 17, 2019 10:42 AM
To: Tristan Jones <tristan at jlab.org>
Cc: Acc_Sem_Comm at jlab.org
Subject: Accelerator Seminar on May 3rd

Tristan,

We want to schedule an Accelerator seminar on May 3rd for Bruno Muratori (bruno.muratori at stfc.ac.uk<mailto:bruno.muratori at stfc.ac.uk>) I will try to get a teaser slide from him.  We need to try to reserve F113 for 11:00 on that day if it is available.  If it is not, we can try L102 or a different time.  Note that Friday is not our usual seminar day but his travel plans do not allow a Thursday date.  The abstract for the seminar is below. There is a photo of him on his web page at:

https://www.astec.stfc.ac.uk/Pages/Bruno-Muratori-Senior-Accelerator-Physicist.aspx<https://gcc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.astec.stfc.ac.uk%2FPages%2FBruno-Muratori-Senior-Accelerator-Physicist.aspx&data=02%7C01%7C%7C4c4d95c7a3ed4a1cd0e808d6c4e56d53%7Cb4d7ee1f4fb34f0690372b5b522042ab%7C1%7C0%7C636912887005947925&sdata=I8sF1INzNwSIlpxy41HDvSx6PUOHox2RcaUyI2X82dQ%3D&reserved=0>

Apparently he would like to come down on May 2nd from Cornell and return there on Sunday.  We can cover at least one day of lodging and expenses and can cover the plane fare for the trip.  Can you contact him to make arrangement?  Thanks.

Steve Benson




Multipole Fringe Fields

Bruno Muratori, ASTeC, Daresbury Laboratory (STFC) & Cockcroft Institute, UK

When creating an initial model of an accelerator, one usually has to resort to a hard edge model for the quadrupoles and higher order multipoles at the start of the project. Ordinarily, it is not until much later on that a field map for the given multipoles becomes available. This can be rather inconvenient when dealing with particularly thin elements or elements which are rather close together in a beamline as the hard edge model is usually inadequate for the level of precision desired. For example, in the EMMA project, the two types of quadrupoles used are so close together that they are usually described by a single field map or via hard edge models. The first method has the desired accuracy but was not available at the start of the project and the second is known to be a rough approximation. An analytic expression is derived and presented for fringe fields for a multipole of any order. The theory is then successfully applied to the EMMA quadrupoles as well as the LHC inner triplet quadrupoles. Future work and possible extensions will also be discussed.



Stephen Benson
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