The OPAL Discussion Forum

["Russell, Steven J" <srussell AT lanl.gov>]

Bettina,

Also note that while you have energy bins, you also are performing the image charge calculation. As soon as a rebin is done, the image charge calculation stops.

Like Andreas said, MINSTEPFORREBIN will go away soon. But for now what I do is first set MINSTEPFORREBIN to a very large value (1000000 or so) and run a track with a ZSTOP set to a location that is far enough from the cathode that I am confident that the image charge field is relatively small. I then set MINSTEPFORREBIN = 1 and then do a follow up track. Depending on what value you've set for the rebin minimal energy spread, the code will typically rebin at the start of the follow up track.

Cheers

Steve

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From: opal-admin AT lists.psi.ch [opal-admin AT lists.psi.ch] on behalf of Andreas Adelmann [andreas.adelmann AT psi.ch]
Sent: Friday, May 04, 2012 9:21 AM
To: Kuske, Bettina
Cc: opal AT lists.psi.ch
Subject: Re: [Opal] MINSTEPFORREBIN

Hello Bettina if you are emitting, you specify a number of 

energy bins (NBIN) on the distribution. MINSTEPFORREBIN defines

the minimal number of integration steps until we rebin i.e. NBIN=1.

This will go away soon and the only the minimal energy spread controls the

rebinding process. MINSTEPFORREBIN is problem dependent.

Cheers Andreas 

On May 4, 2012, at 4:21 PM, Kuske, Bettina wrote:

Dear all,

I’m just starting off to use OPAL, and do not

find any explanation in the manual about the

‘MINSTEPFORREBIN’ parameter. It has a huge influence, though

on the sigmas of my beam from the cathode.

What does it do? Which are common values to use?

Thanks,

Bettina

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