eprintid: 3024
rev_number: 10
eprint_status: archive
userid: 1
dir: disk0/00/00/30/24
datestamp: 2002-11-25 00:00:00
lastmod: 2014-04-03 12:28:31
status_changed: 2012-08-14 15:06:29
type: doctoralThesis
metadata_visibility: show
creators_name: Eike, Björn
title: Laser-trapped Atoms as a Precision Target for the Heavy-Ion Storage Ring TSR
title_de: Lasergekühlte Atome als Präzisionstarget für den Schwerionenspeicherring TSR
ispublished: pub
subjects: ddc-530
divisions: i-851340
adv_faculty: af-13
keywords: Cesium atoms , Magneto-optical trap , Storage ring , Beam profile , Internal target
cterms_swd: Cäsiumatom
cterms_swd: Magnetooptische Atomfalle
cterms_swd: Speicherring
cterms_swd: Strahlprofil
cterms_swd: Internes Target
abstract_translated_text: A target based on ultracold cesium  atoms confined in a magneto-optical trap (MOT) has been installed inside the Heidelberg Test Storage Ring TSR. Since the trapped atoms are very well localized and their thermal energy can be neglected they are ideally suited to study collisions with stored heavy ions at energies of some MeV/u.  Measurements of collision cross sections for ionization of the target atoms are  carried out and the results are compared to theoretical predictions. Additionally, the transfer of electrons from the target atom to  the projectile ion is investigated. Inner shell vacancies produced in the capture process  are filled by Auger-cascades and shake-off processes. Therefore, the cesium is ionized to several charge states.  The charge states are resolved by time-of-flight measurements. From the TOF spectra the momentum transfer to the recoiled cesium ion is determined.   As an additional application the trapped atoms are used to measure the two-dimensional density distribution of the stored ions. This method is of great interest for very dilute beams because reliable measurements down to very low ion currents in the order of 10 nA become possible. The resolution of this method is only limited by the size of the atom cloud (actual diameter: some 100 µm). Thus, the resolution is better than resolution of the restgas beam profile monitor at TSR.
abstract_translated_lang: eng
class_scheme: pacs
class_labels: 41.85.Ew, 29.20.Dh, 32.80.Pj, 34.50.Fa, 34.70.+e
date: 2002
date_type: published
id_scheme: DOI
id_number: 10.11588/heidok.00003024
ppn_swb: 1643356488
own_urn: urn:nbn:de:bsz:16-opus-30244
date_accepted: 2002-11-06
advisor: HASH(0x55fc36d63eb8)
language: eng
bibsort: EIKEBJORNLASERTRAPP2002
full_text_status: public
citation:   Eike, Björn  (2002) Laser-trapped Atoms as a Precision Target for the Heavy-Ion Storage Ring TSR.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/3024/1/diss_b_eike.pdf