Direkt zum Inhalt
  • Paul Scherrer Institut PSI
  • PSI Research, Labs & User Services

Digital User Office

  • Digital User Office
  • DE
  • EN
  • FR
Paul Scherrer Institut (PSI)
Suche
Paul Scherrer Institut (PSI)

Hauptnavigation

  • Research at PSIÖffnen dieses Hauptmenu Punktes
    • Research Initiatives
    • Ethics and Research integrity
    • Scientific Highlights
    • Scientific Events
    • Scientific Career
    • PSI-FELLOW
    • PSI Data Policy
  • Research Divisions and LabsÖffnen dieses Hauptmenu Punktes
    • Overview
    • Research with Neutrons and Muons
    • Photon Science
    • Energy and Environment
    • Nuclear Energy and Safety
    • Biology and Chemistry
    • Scientific Computing, Theory and Data
    • Large Research Facilities
  • Facilities and InstrumentsÖffnen dieses Hauptmenu Punktes
    • Overview
    • Large Research Facilities
    • Facilities
    • PSI Facility Newsletter
  • PSI User ServicesÖffnen dieses Hauptmenu Punktes
    • User Office
    • Methods at the PSI User Facilities
    • Proposals for beam time
    • Proposal Deadlines
    • Data Analysis Service (PSD)
    • EU support programmes
  • New ProjectsÖffnen dieses Hauptmenu Punktes
    • SLS 2.0
    • IMPACT
  • DE
  • EN
  • FR

Digital User Office (mobile)

  • Digital User Office

Sie befinden sich hier:

  1. PSI Home
  2. Labs & User Services
  3. NUM
  4. SMUS
  5. Beamlines
  6. µE4

Sekundäre Navigation

SμS: Swiss Muon Source

  • Instruments
    • DOLLY
      • DOLLY Developments
    • FLAME
      • FLAME Developments
    • GPD
      • Magnetic Fields Instructions
      • Development of High-Pressure Cells
    • GPS
      • GPS Developments
    • HAL-9500
      • HAL-9500 Developments
    • LEM
      • LEM Developments
    • MIXE Project
  • Beamlines Ausgeklappter Submenü Punkt
    • Introduction
    • µE1
    • µE4
    • piM3
    • piE3
    • piE1
    • The HIMB Project
  • User Services
    • Access to SμS
      • Calls
      • Scientific Committee
    • SμS Live
      • Beamtime Schedule
    • Software & Data Storage
      • Data Format
      • Data Archiving
    • Safety regulations
    • Contact Information
  • Publications
    • Publication Policy
  • Contact

Info message

Dieser Inhalt ist nicht auf Deutsch verfügbar.

The rebuilt µE4 beam line, in operation since 2005


The rebuilt µE4 beam is a large acceptance beam line for muons with low momentum (< 40 MeV/c). It was specially designed to serve the needs of the low-energy muon (LEM) beam facility at PSI, i.e. maximum µ+ intensity at 28 MeV/c and a beam spot fitting to the size of the muon moderator target of the LEM apparatus. In order to keep costs and time for reconstruction low the new beam line had to follow the existing µE4 channel until the end of the main shielding of the proton beam. The large acceptance is achieved by using two normal conducting solenoids (WSX61 and WSX62) as the first focusing elements feeding the 40o degree bending magnet (ASR61). This magnet has a pole face rotation of 33o degree at the entrance and exit in order to provide momentum dispersion in the center of the second bending magnet ASR62 where the momentum bite can be varied by a horizontal slit system (FS62). ASR62 and ASR63 have rectangular pole shoes and bend by 34o degree each. The two vertical and horizontal slit systems FS61 and FS63 can be used to reduce the intensity. Focusing is done with four triplets of large aperture (QSM601 - QSM612) quadrupole magnets. A new static separator (SEP61) with crossed electric and magnetic field (E x B) strongly reduces the electron/positron contamination. The maximum fields will be 22.2 kV/cm (400 kV, 18 cm gap between the electrode plates) and 50 mT.

Besides the reconstruction of the µE4 channel the experimental area has been rebuilt to provide sufficient space for the LEM apparatus and other experiments.

The beamline has been commissioned during 2005. The LEM experiment started successfully with an engineering run between october and december 2005 to test and put into operation the completely new setup with new data acquisition hard- and software and a new slow control system.

Beam transport calculations

We compared the beam properties of the new µE4 beam line with the existing piE3 beam line (achromatic mode) where the LEM experiments are presently performed. Two modes of operation are possible for the new beam line: when using the full acceptance the momentum resolution is limited to 5%. With a reduced acceptance the momentum resolution can be improved to 1.8%. The corresponding Transport beam envelopes are shown here.

An estimate of the vertical beam shift due to horizontal WSX misalignment is shown here. In order to correct a possible vertical beam shift the first QSM triplett can be operated asymmetrically. This introduces an effective magnetic dipole component that allows vertical steering of the beam.

The measured beam transport properties and a comparison with the calculations can be found in 

T. Prokscha, E. Morenzoni, K. Deiters, F. Foroughi, D. George, R. Kobler, A. Suter, V. Vrankovic, The new µE4 beam at PSI: a hybrid-type large accpetance channel for the generation of a high intensity surface-muon beam, Nucl. Instr. Meth. A 595 , 317 (2008), doi:10.1016/j.nima.2008.07.081.

Beamline elements: calibration, power supplies, settings

  • Calibration of magnets and slits
  • List of power supplies (with DAC values used before 2013)
  • The control system of the beam line has been changed to EPICS in 2013.
  • Beamline settings for 28 MeV/s, separator off (e+/µ+ = 4):
    • WSX on (2013: epics control system, magnet currents given in Ampère instead of DAC values), max. intensity with best focussing on LEM moderator target (3 x 3 cm2, 0.5m downstream of QSM612), momentum width 9.5%(FWHM). µ+ intensities (for 40mm target E): 228 M/mAs (per mA of proton current) integral, and 98 M/mAs on moderator.  At 300 kV separator voltage the rates reduce to 210 M/mAs and 86 M/mAs, respectively.  For 60mm target E length, the rate on moderator is about 50% higher.
    • WSX off (DAC values used before 2013), low intensity with good momentum resolution of 1.5% (FWHM). µ+ intensities (for 40mm target E): 0.46 M/mAs integral, and 0.42 M/mAs on moderator.

Mit Sidebar

LMU and Groups

  • Laboratory for Muon Spin Spectroscopy (LMU)
  • Low-Energy Muons Group
  • Bulk-µSR Group

User Contacts

  • User Office
    Provides all information about user research at PSI Large Research Facilities
  • DUO Login

Call for Proposals

Next Deadline: June 01, 2023.

PSI User Facilities Newsletter

Current News from PSI photon, neutron and muon user facilities


NUM Homepage

PSI Division Research with Neutrons and Muons.


MuonSources.org

MuonSources.org provides information about muon facilities and muon research worldwide.

ISMS

The International Society for µSR Spectroscopy (ISMS).

top

Fussbereich

Paul Scherrer Institut

Forschungsstrasse 111
5232 Villigen PSI
Schweiz

Telefon: +41 56 310 21 11
Telefax: +41 56 310 21 99

Der Weg zu uns
Kontakt

Besucherzentrum psi forum
Schülerlabor iLab
Zentrum für Protonentherapie
PSI Bildungszentrum
PSI Guest House (in english)
PSI Gastronomie
psi forum-Shop

 

Service & Support

  • Telefonbuch
  • User Office
  • Accelerator Status
  • Publikationen des PSI
  • Lieferanten
  • E-Rechnung
  • Computing
  • Sicherheit

Karriere

  • Arbeiten am PSI
  • Stellenangebote
  • Aus- und Weiterbildung
  • Career Center
  • Berufsbildung
  • PSI Bildungszentrum

Für die Medien

  • Das PSI in Kürze
  • Zahlen und Fakten
  • Mediacorner
  • Medienmitteilungen
  • Social Media

Folgen Sie uns: Twitter (deutsch) LinkedIn Youtube Facebook Instagram Issuu RSS

Footer legal

  • Impressum
  • Nutzungsbedingungen
  • Editoren-Login