The OPAL Discussion Forum

[Christian Baumgarten <christian.baumgarten AT psi.ch>]

Am Friday 06 April 2018 schrieb Adelmann Andreas (PSI):
> Dear OPAL community, there is a proposal from Oliver Amoros, Concepcion and
>  Pedro Calvo Portela for new types of particle interaction in OPAL.
> 
> Comments and further ideas are highly appreciated.
> 
> Cheers Andreas
> 

Dear Andreas et al,

very good idea indeed.

One comment: I would expect that the van-der-Waals 
constants "a" and "b" can be neglected at gas densities 
in which cyclotrons are able to work, probably even close 
to internal ion sources.

Of course it would be interesting to have this kind of loss
Monte Carlo also for H2+, though I am not sure if cross
section data for different vibration states are known...

One question: Did you also consider to trace stripped 
ions to the walls of the vacuum tank to enable for a 
prediction of activation hot spots?

-- Christian

> ------
> Dr. sc. math. Andreas (Andy) Adelmann
> Staff Scientist - Deputy Labor Head LSM
> Paul Scherrer Institut OHSA/D17 CH-5232 Villigen PSI
> Phone Office: xx41 56 310 42 33 Fax: xx41 56 310 31 91
> Phone Home: xx41 62 891 91 44
> -------------------------------------------------------
> Friday: ETH CAB F37 or HPK G 28   +41 44 632 75 22
> ============================================
> The more exotic, the more abstract the knowledge,
> the more profound will be its consequences.
> Leon Lederman
> ============================================
> 
> Begin forwarded message:
> 
> From: "Calvo Portela, Pedro"
>  <Pedro.Calvo AT ciemat.es<mailto:Pedro.Calvo AT ciemat.es>> Subject: Particle
>  interactions for news developments in OPAL
> Date: 6 April 2018 at 14:11:50 GMT+2
> To: "andreas.adelmann AT psi.ch<mailto:andreas.adelmann AT psi.ch>"
>  <andreas.adelmann AT psi.ch<mailto:andreas.adelmann AT psi.ch>> Cc: "Oliver
>  Amoros, Concepcion"
>  <concepcion.oliver AT ciemat.es<mailto:concepcion.oliver AT ciemat.es>>,
>  "daniel.winklehner AT psi.ch<mailto:daniel.winklehner AT psi.ch>"
>  <daniel.winklehner AT psi.ch<mailto:daniel.winklehner AT psi.ch>>,
>  "jralonso AT lbl.gov<mailto:jralonso AT lbl.gov>"
>  <jralonso AT lbl.gov<mailto:jralonso AT lbl.gov>>,
>  "conrad AT mit.edu<mailto:conrad AT mit.edu>"
>  <conrad AT mit.edu<mailto:conrad AT mit.edu>>
> 
> Dears
> 
> As a OPAL project collaborators, we are interested in vacuum stripping
>  implementation in the code. So, we have drafted  a document that
>  summarizes the main models for particle interactions in a cyclotron, as
>  Andreas Adelmann suggested us few months ago. This is a first draft,
>  focused on H- ions, but with references to H2+ ions. In addition to the
>  stripping of residual gas I have included the magnetic field stripping
>  Here a link (https://www.overleaf.com/12081868dfvxxgzzqvdq#/45866384) with
>  the LaTex document. We would appreciate any comments or suggestions on
>  this topic
> 
> Best regards
> 
> Pedro Calvo Portela
> Unidad de Aceleradores - CIEMAT
> Avenida Complutense 40, Edificio 7
> 28040 Madrid
> Tel: +34 – 91 496 2554
> 


-- 

Paul Scherrer Institut
Dr. Christian Baumgarten
Accelerator Physicist 

Large research facilities
WBGA/C34
5232 Villigen PSI
Switzerland

Phone +41 56 310 3780
christian.baumgarten AT psi.ch
www.psi.ch