The OPAL Discussion Forum

[jjyang <jianjun.yang AT psi.ch>]

Hi Suzie,

You are right. Only PY was fixed last time but Y was not.  I fixed it right now.

Thanks for remind this. 

Jianjun Yang

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Post-doctoral
Massachusetts Institute of Technology

Work Address:
Paul Scherrer Institut   WBGB/125 
CH-5232 Villigen PSI Switzerland
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在 2011-10-13，上午10:51， Suzie Sheehy 写道：

Hi again,

If I'm not wrong, there is still a typo on pp.43 of the manual that you sent me a link to. It seems that y should be the longitudinal position of a particle (rather than horizontal, as it currently says), matching PY being the longitudinal canonical momentum?

Best Wishes,

Suzie

On 24 Aug 2011, at 09:43, jjyang wrote:

Dear Suzie,

 I just updated pp.43 of Manual today and hopefully it can answer your confusion.  You can find the latest manual at  http://amas.web.psi.ch/docs/opal

 In order to achieve compatibility between different flavors,  the units of the momentum in DISTRIBUTION for both OPAL-T and OPAL-CYCL  are now unified to [eV], 

rather than betagamma. So you should convert from your mrad to [eV]  following the NOTE on pp.43.

In terms of the H5Root, for the h5 file generated by OPAL-CYCL, x,px are horizontal,   y,py are longitudinal  and z,pz are vertical. This is to maintain a right-hand coordinates frame.

Best wishes.

Jianjun Yang

在 2011-8-22，上午6:53， Andreas Adelmann 写道：

Hi Andreas,

I'm a little confused about the output when I'm trying to run a bunch with space charge.

I'm running for a single turn with a standard KV distribution, where particles populate the surface of an ellipsoid in 4D (transver) space. In OPAL I've discovered that I should use a BINOMIAL distribution, with m=0.0 for x and y and m=1.0 to make the distribution uniform in t. In this definition for sigmapx, sigmapy, do I need to use the definitions on pp.43 for conversion from what I would call "normal" phase space ie. in mrad to betagamma units?

Also, I wanted to check that in H5Root, the variables x,px are horizontal, y,py are vertical and z,pz are longitudinal?

The confusion is arising because of pp.43 in the manual, where it says that for OPAL-CYCL x,px are horizontal in a "given" co-ordinate system, y,py are horizontal in a global co-ordinate system and z,pz are vertical in a global co-ordinate system.

Thanks,
Suzie

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Suzie Sheehy
Research Fellow and 2010 Brunel Fellow
Royal Commission for the Exhibition of 1851
ASTeC Intense Beams Group
Rutherford Appleton Laboratory (R2, 403)

Didcot, Oxon, OX11 0QX
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+44 (0)1235 446 782
suzie.sheehy AT stfc.ac.uk
www.suziesheehy.co.uk

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