opal AT lists.psi.ch

Subject: The OPAL Discussion Forum

List archive

Re: [Opal] Backtracking in OPAL

From: Adelmann Andreas <andreas.adelmann AT psi.ch>
To: 郑盼盼 <zhengpp AT shanghaitech.edu.cn>
Cc: "opal AT lists.psi.ch" <opal AT lists.psi.ch>
Subject: Re: [Opal] Backtracking in OPAL
Date: Thu, 3 Jul 2025 11:27:45 +0000
Accept-language: en-US
Arc-authentication-results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=psi.ch; dmarc=pass action=none header.from=psi.ch; dkim=pass header.d=psi.ch; arc=none
Arc-message-signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=pGjpnA5rcAq3rb5OJR9FBM8PBr6bqTmC0Pe0DLg4omc=; b=Ia5vrQ2xEuNXkD5i3CGl4t1xr0gx8qMlUXRfOftjkmi/IwtmAzv1C4Uy/+sn9173xOS6Gfed05rv5ydJa1WTLksaZbwyLUfo2xlQP/ahYafdvESX++EfcuEWLVTchGa4XIPpvj8fy33aDc4Ek7VufgRkE2ApsWBSk+JkKue5oyQbvywDUV/JP5awx1QGKJTagg005dZot6vdKASufdDNLCPiBxgJsiSvPCoOl5t0XK7qDg6BXhFwOj3uDL/fxceJgRWnTgrAEls2T6t1raW8H44yLv9sazLIkiMBlecu/7qcGupTnn5dkFZVcazhWB9HZgETd8xlna0RjzordcyU1Q==
Arc-seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=UAtnaEHq8QRvwZdW9XbN0v71neXvIQSPTmzLf7dobJytlr83+wsWpT2heD07Uijh0yTZ5yFxZXTbTWuvgW9Wi0RlrJCGtwQ3dH86JQy/bnO0c5iXDEzB4Z/Zyh0DDhq2voWSGZRnaqPnPv056stLsCeyintS/kgCM0SOdP/RpcEIa/SOuis/z2B1vC4w5kGurXSiDcv0M892QIwGADTTyvU+Nt7K+g+I9oD+DWXqrGfzZ6uByPpppNzynqobSwaQFYI4ybkLc8L0ckycjTOhXel2944ck5wHsQZcncKmY85JJkCaqX8dMZUnQgojHNkmwC2hB4BlfIAIEt9pyM4G2Q==
Authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=psi.ch;

Hi Panpan guessing from your question; I assume you

are using the OPAL-cycl flavour. If that is the case BACKTRACK most likely does not work.

In any case backtrack uses as initial conditions the last phase space dump of the forward track

Cheers A

------
Dr. sc. math. Andreas (Andy) Adelmann
Paul Scherrer Institut OHSA/D17 CH-5232 Villigen PSI
Phone Office: xx41 56 310 42 33 Fax: xx41 56 310 31 91
Zoom ID: 470-582-4086 Password: AdA
Zoom Link: https://ethz.zoom.us/j/4705824086?pwd=dFcvT1pMMGY0bHg0dTNncUNZZTJkZz09

-------------------------------------------------------
Friday: ETH HPK G 28 +41 44 633 3076
============================================
The more exotic, the more abstract the knowledge,
the more profound will be its consequences.
Leon Lederman
============================================

On 3 Jul 2025, at 12:55, 郑盼盼 <zhengpp AT shanghaitech.edu.cn> wrote:

Dear,

Hello,
I want to perform backtracking for optimal beam centering using OPAL. Does OPAL's backtracking functionality automatically provide the initial parameters: radial position(r0), azimuth angle(ph0) and radial momentum(pr0)?

With best regards,
Panpan Zheng

Attachment: smime.p7s
Description: S/MIME cryptographic signature

[Opal] Backtracking in OPAL, 郑盼盼, 07/03/2025
- Re: [Opal] Backtracking in OPAL, Adelmann Andreas, 07/03/2025