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Paul Scherrer Institut PSI Accelerator Development and Operation Support

Paul Scherrer Institut
5232 Villigen PSI, Schweiz/Switzerland
Tel. +41 56 310 21 11
Fax. +41 56 310 21 99

E-Mail: andreas.streun@psi.ch

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SLS Internal Reports 2005


Helge Krüger

Simulations for Touschek Lifetime

28-SEP-2005, 26 pages [PDF]

Single intrabeam scattering of electrons leading to energy changes larger than the energy acceptance (Touschek scattering) is an important mechanism of particle loss in a light source storage ring. The dependance of Touschek lifetime on beam properties (emittance, coupling, bunch length etc.) and energy acceptance can be described by an analytical formula, which has proven to agree well with observations at existing machines. This formula describes an obvious decrease of Touschek lifetime with shrinking emittance, however for ultralow emittance beams, the lifetime should become larger again. This report deals with the modeling of Touschek effect based on macro particles. Different approaches like direct Coulomb scattering and Møller scattering will be discussed. Results for a simple test lattice and the SLS lattice will be compared to the analytical formula and to measurements done at SLS.


A. Streun

Non-Linearities in Light Sources

Lecture given at the CERN Accelerator School Accelerator physics (Intermediate Level), Zeuthen, Germany, Sept. 15-26, 2003, 27-SEP-2005, 15 pages [PDF]

Correction of a light source s large chromaticity while maintaining sufficient dynamic aperture and momentum acceptance requires careful optimization of the sextupole configuration in first and second order of sextupole strength. In this paper we try to explain chromaticity and its correction in a most intuitive way. Accompanied by the step wise improvement of a test lattice, the scheme is then expanded from plain correction with two sextupole families to installation of harmonic setupole for first and second order optimization. The approach is most visual and pragmatic on expense of the mathematical formalism which may be found in the references.


J. Chrin, M. Böge

Developments to the SLS CORBA Framework for High Level Software Applications

Presented at ICALEPCS 05, October 10-14, 2005, Geneva, Switzerland, 27-SEP-2005, 6 pages [PS] [PDF]

A CORBA based client-server framework has been in active service since the start of SLS in 2001. It provides for an uniform interface to a variety of persistent objects required by beam dynamics applications in the domain of controls, accelerator modelling, database transactions and message logging. The framework underwent significant development during the course of the last two years motivated by advances in hardware capabilities, recent releases of CORBA packages and a renewed analysis of user requirements. [...] The recent updates to the framework are presented, together with an account of how complex events are created and processed for delivery to registered consumers through the CORBA Event Service.


Oliver Bunk, Xavier Donath, Franz Pfeiffer

Specifications and Call for Tender for Shielding Components of the SLS Beamline X12SA

20-SEP-2005, 16 pages [PDF]

Specifications and Call for Tender for Shielding Components of the SLS Beamline X12SA for coherent Small Angle X-Ray Scattering (cSAXS)

1. Shielded Optics Hutch X12SA-OP
2. Shielded Experiments Hutch X12SA-ES
3. Pumping Chamber Shielding X12SA-PCS
4. Hard X-Ray Pipe Shielding X12SA-BGT


Franz Pfeiffer, Oliver Bunk, Xavier Donath

Specifications of the Optical System of the SLS coherent Small Angle X-ray Scattering beamline X12SA (cSAXS)

14-SEP-2005, 18 pages [PDF]

Call for Tender: Optical system consisting of double crystal monochromator and mirror vacuum chamber The optical system is to be fabricated according to these specifications. The factory acceptance test will be surveyed by PSI staff and the site acceptance test will be performed by PSI staff accompanied by contractor representatives.


Åke Andersson, Simon C. Leemann

Experimental Determination of the Point-Spread Function for the Optical Diagnostics Setup at the 100 keV Gun Test Stand

9-SEP-2005, 10 pages [PDF]

In the scope of the LEG Project a 100 keV gun test stand is currently being built. The test stand will contain various diagnostic equipment in order to characterize the 100 keV electron beam. [...] In order to properly measure the light pattern we are relying on a commercial zoom optic system (Thales Optem Telecentric Zoom 100) and CCD camera (Sony XC-55) together with an in-house frame-grabber system used widely at SLS. The aim of the experiments reported in this note is to investigate how well a measured image corresponds to the real light pattern. For this the so called Point-Spread Function (PSF) is experimentally determined.


D. Meister, M. Stampanoni

Specification of the Filters and Slits Assemblies for the X-ray Tomographic Microscopy (XTM) beamline (X02DA) of the SLS

1-MAY-2005, 15 pages [PDF]


M. Böge, B. Keil, A. Lüdeke, T. Schilcher

User Operation and Upgrades of the Fast Orbit Feedback at the SLS

Presented at the Particle Accelerator Conference (PAC05) 16-20 May 2005, Knoxville, USA, 23-MAY-2005, 3 pages [PS] [PDF] [HTML]

A report on the performance of the fast orbit feedback (FOFB) in its 2nd year of user operation is given. Photon beam position monitors (XBPM) have been included by means of a slow feedback which changes the reference settings of the FOFB. Users are permitted to change the XBPM references within certain limits while the feedback is running. A fast synchronous readout of the XBPMs allows their integration into the FOFB loop. The FOFB will be extended by an additional beam position monitor (BPM) in order to satisfy the requirements of the upcoming FEMTO project.


M. Böge, J. Chrin, G. Ingold, B. Keil, J. Krempasky, T. Schilcher, V. Schlott, T. Schmidt, A. Streun

Correction of insertion device induced orbit distortions at the SLS

Presented at the Particle Accelerator Conference (PAC05) 16-20 May 2005, Knoxville, USA, 23-MAY-2005, 3 pages [PS] [PDF] [HTML]

Corrections of insertion device (ID) induced orbit distortions at the SLS are performed by means of feed forward schemes down to the micron level at the corresponding photon beam position monitors (XBPMs). The remaining orbit fluctuations are suppressed by XBPM feedbacks which are an integral part of the fast orbit feedback system. As a result, sub-┬Ám RMS stability at the XBPMs is achieved while the ID settings are varied.


S. C. Leemann, Å. Andersson

Gun Test Stand Solenoid Measurement

5-APR-2005, 9 pages [PDF]

In the scope of the LEG Project [1] it has been decided to build a 100 keV gun test stand. In this test stand, we attempt to compensate emittance blow-up due to space charge forces with a solenoid magnet. The solenoid magnet has recently been manufactured to our specifications at PSI. In the test stand, the solenoid is sealed off from the vacuum surroundings by a UHV-compatible welded steel casing. We wanted to measure the solenoid properties and verify that it fulfills design specifications, before it was definitely welded into the steel casing. The measurement procedures and results are presented in this paper.


Q. Chen

The specifications for the SLS front end of X03M

31-MAR-2005, 0 pages


Q. Chen

Specifications for X10DA FE and the first section of X10DB FE at SLS

10-MAR-2005, 0 pages


M. Johnson

Specifications for monochromator and Optics for a VUV Beamline at the SLS

25-FEB-2005, 0 pages


Q. Chen

Specifications for IR light switchyard at the X01DC beamline of SLS

17-FEB-2005, 0 pages


M. Nachtegaal, A. M. Scheidegger, D. Grolimund, R. Abela

Requirements for Super-XAS beamline (X10DA) at SLS

31-JAN-2005, 2 pages [PDF]


Q. Chen

The specifications of the photon beam position monitors for 7DB front end of SLS

11-JAN-2005, 0 pages



Summary of the 3rd International Workshop on Beam Orbit Stabilization - IWBS2004

25-JAN-2005, 7 pages [PS] [PDF] [HTML]

In 2004 the Paul Scherrer Institute was privileged to continue a series of two very successful IWBS workshops, previously hosted by the SPring-8 Accelerator Division in 2001 and 2002. IWBS2004 was held at the Hotel Kirchbühl in Grindelwald, Switzerland during December 6-10, where 47 accelerator physicists from 12 countries gathered to talk about orbit stability matters. Excellent orbit stability is one of the key issues in 3rd generation light sources since the orbit has to be stabilized typically to 1/10th of the beam size at the location of the insertion devices, translating to sub-micron stability requirements over time periods ranging from ms to days. The upcoming linear accelerator based 4th generation light sources also have tight tolerances on their residual trajectory jitter which induces the need for slow, fast and very fast multi-bunch feedforward/feedback systems.


M. Stampanoni, M. Lange

Specifications of the Shielded Hutch and Vacuum for the X-ray Tomographic Microscopy (XTM) beamline

18-JAN-2005, 12 pages [PDF]

Specifications for: One Shielded Hutch for High-Energy Synchrotron Radiation Experiments The lead-shielded hutch is to be fabricated according to ESRF Design A1 , including walls, doors, windows, chicanes and media supports. The hutch walls must accurately fit to the existing SLS tunnel shielding. Pre-construction surveying and radiation testing will be performed by PSI staff accompanied by contractor representatives.

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