1
|
Assefa TA, Seaberg MH, Reid AH, Shen L, Esposito V, Dakovski GL, Schlotter W, Holladay B, Streubel R, Montoya SA, Hart P, Nakahara K, Moeller S, Kevan SD, Fischer P, Fullerton EE, Colocho W, Lutman A, Decker FJ, Sinha SK, Roy S, Blackburn E, Turner JJ. The fluctuation-dissipation measurement instrument at the Linac Coherent Light Source. Rev Sci Instrum 2022; 93:083902. [PMID: 36050107 DOI: 10.1063/5.0091297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Accepted: 06/30/2022] [Indexed: 06/15/2023]
Abstract
The development of new modes at x-ray free electron lasers has inspired novel methods for studying fluctuations at different energies and timescales. For closely spaced x-ray pulses that can be varied on ultrafast time scales, we have constructed a pair of advanced instruments to conduct studies targeting quantum materials. We first describe a prototype instrument built to test the proof-of-principle of resonant magnetic scattering using ultrafast pulse pairs. This is followed by a description of a new endstation, the so-called fluctuation-dissipation measurement instrument, which was used to carry out studies with a fast area detector. In addition, we describe various types of diagnostics for single-shot contrast measurements, which can be used to normalize data on a pulse-by-pulse basis and calibrate pulse amplitude ratios, both of which are important for the study of fluctuations in materials. Furthermore, we present some new results using the instrument that demonstrates access to higher momentum resolution.
Collapse
Affiliation(s)
- T A Assefa
- Stanford Institute for Materials and Energy Science, Stanford University and SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - M H Seaberg
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - A H Reid
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - L Shen
- Stanford Institute for Materials and Energy Science, Stanford University and SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - V Esposito
- Stanford Institute for Materials and Energy Science, Stanford University and SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - G L Dakovski
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - W Schlotter
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - B Holladay
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - R Streubel
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA and Physics Department, University of California Santa Cruz, Santa Cruz, California 95064, USA
| | - S A Montoya
- Center for Memory and Recording Research, University of California-San Diego, La Jolla, California 92093, USA
| | - P Hart
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - K Nakahara
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - S Moeller
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - S D Kevan
- Department of Physics, University of Oregon, Eugene, Oregon 97401, USA
| | - P Fischer
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA and Physics Department, University of California Santa Cruz, Santa Cruz, California 95064, USA
| | - E E Fullerton
- Center for Memory and Recording Research, University of California-San Diego, La Jolla, California 92093, USA
| | - W Colocho
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - A Lutman
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - F-J Decker
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - S K Sinha
- Department of Physics, University of California-San Diego, La Jolla, California 92093, USA
| | - S Roy
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - E Blackburn
- Division of Synchrotron Radiation Research, Department of Physics, Lund University, 22100 Lund, Sweden
| | - J J Turner
- Stanford Institute for Materials and Energy Science, Stanford University and SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| |
Collapse
|
2
|
Vinko SM, Ciricosta O, Preston TR, Rackstraw DS, Brown CRD, Burian T, Chalupský J, Cho BI, Chung HK, Engelhorn K, Falcone RW, Fiokovinini R, Hájková V, Heimann PA, Juha L, Lee HJ, Lee RW, Messerschmidt M, Nagler B, Schlotter W, Turner JJ, Vysin L, Zastrau U, Wark JS. Investigation of femtosecond collisional ionization rates in a solid-density aluminium plasma. Nat Commun 2015; 6:6397. [PMID: 25731816 DOI: 10.1038/ncomms7397] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2014] [Accepted: 01/26/2015] [Indexed: 11/09/2022] Open
Abstract
The rate at which atoms and ions within a plasma are further ionized by collisions with the free electrons is a fundamental parameter that dictates the dynamics of plasma systems at intermediate and high densities. While collision rates are well known experimentally in a few dilute systems, similar measurements for nonideal plasmas at densities approaching or exceeding those of solids remain elusive. Here we describe a spectroscopic method to study collision rates in solid-density aluminium plasmas created and diagnosed using the Linac Coherent light Source free-electron X-ray laser, tuned to specific interaction pathways around the absorption edges of ionic charge states. We estimate the rate of collisional ionization in solid-density aluminium plasmas at temperatures ~30 eV to be several times higher than that predicted by standard semiempirical models.
Collapse
Affiliation(s)
- S M Vinko
- Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK
| | - O Ciricosta
- Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK
| | - T R Preston
- Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK
| | - D S Rackstraw
- Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK
| | - C R D Brown
- Department of Plasma Physics, AWE Aldermaston, Reading RG7 4PR, UK
| | - T Burian
- Institute of Physics ASCR, Na Slovance 2, Prague 8 18221, Czech Republic
| | - J Chalupský
- Institute of Physics ASCR, Na Slovance 2, Prague 8 18221, Czech Republic
| | - B I Cho
- 1] Center for Relativistic Laser Science, Institute for Basic Science (IBS), Gwangju 500-712, Korea [2] Department of Physics and Photon Science, Gwangju Institute of Science and Technology, Gwangju 500-712, Korea
| | - H-K Chung
- Atomic and Molecular Data Unit, Nuclear Data Section, IAEA, PO Box 100, Vienna A-1400, Austria
| | - K Engelhorn
- Lawrence Berkeley National Laboratory, 1 Cyclotron Road, California 94720, USA
| | - R W Falcone
- 1] Lawrence Berkeley National Laboratory, 1 Cyclotron Road, California 94720, USA [2] Department of Physics, University of California, Berkeley, California 94720, USA
| | - R Fiokovinini
- Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK
| | - V Hájková
- Institute of Physics ASCR, Na Slovance 2, Prague 8 18221, Czech Republic
| | - P A Heimann
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - L Juha
- Institute of Physics ASCR, Na Slovance 2, Prague 8 18221, Czech Republic
| | - H J Lee
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - R W Lee
- Department of Physics, University of California, Berkeley, California 94720, USA
| | - M Messerschmidt
- National Science Foundation BioXFEL Science and Technology Center, 700 Ellicott Street, Buffalo, New York 14203, USA
| | - B Nagler
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - W Schlotter
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J J Turner
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - L Vysin
- Institute of Physics ASCR, Na Slovance 2, Prague 8 18221, Czech Republic
| | - U Zastrau
- IOQ, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, Jena 07743, Germany
| | - J S Wark
- Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK
| |
Collapse
|
3
|
Ratner D, Abela R, Amann J, Behrens C, Bohler D, Bouchard G, Bostedt C, Boyes M, Chow K, Cocco D, Decker FJ, Ding Y, Eckman C, Emma P, Fairley D, Feng Y, Field C, Flechsig U, Gassner G, Hastings J, Heimann P, Huang Z, Kelez N, Krzywinski J, Loos H, Lutman A, Marinelli A, Marcus G, Maxwell T, Montanez P, Moeller S, Morton D, Nuhn HD, Rodes N, Schlotter W, Serkez S, Stevens T, Turner J, Walz D, Welch J, Wu J. Experimental demonstration of a soft x-ray self-seeded free-electron laser. Phys Rev Lett 2015; 114:054801. [PMID: 25699448 DOI: 10.1103/physrevlett.114.054801] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2014] [Indexed: 05/19/2023]
Abstract
The Linac Coherent Light Source has added a self-seeding capability to the soft x-ray range using a grating monochromator system. We report the demonstration of soft x-ray self-seeding with a measured resolving power of 2000-5000, wavelength stability of 10(-4), and an increase in peak brightness by a factor of 2-5 across the photon energy range of 500-1000 eV. By avoiding the need for a monochromator at the experimental station, the self-seeded beam can deliver as much as 50-fold higher brightness to users.
Collapse
Affiliation(s)
- D Ratner
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - R Abela
- Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - J Amann
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - C Behrens
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - D Bohler
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - G Bouchard
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - C Bostedt
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - M Boyes
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - K Chow
- Lawrence Berkeley National Laboratory (LBNL), 1 Cyclotron Road, Berkeley, California 94720, USA
| | - D Cocco
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - F J Decker
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - Y Ding
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - C Eckman
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - P Emma
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - D Fairley
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - Y Feng
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - C Field
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - U Flechsig
- Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - G Gassner
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - J Hastings
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - P Heimann
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - Z Huang
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - N Kelez
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - J Krzywinski
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - H Loos
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - A Lutman
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - A Marinelli
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - G Marcus
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - T Maxwell
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - P Montanez
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - S Moeller
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - D Morton
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - H D Nuhn
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - N Rodes
- Lawrence Berkeley National Laboratory (LBNL), 1 Cyclotron Road, Berkeley, California 94720, USA
| | - W Schlotter
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - S Serkez
- Deutsches Elektronen-Synchrotron (DESY), Notkestrasse 85, D-22607 Hamburg, Germany
| | - T Stevens
- Lawrence Berkeley National Laboratory (LBNL), 1 Cyclotron Road, Berkeley, California 94720, USA
| | - J Turner
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - D Walz
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - J Welch
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - J Wu
- SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| |
Collapse
|
4
|
Tiedtke K, Sorokin AA, Jastrow U, Juranić P, Kreis S, Gerken N, Richter M, Arp U, Feng Y, Nordlund D, Soufli R, Fernández-Perea M, Juha L, Heimann P, Nagler B, Lee HJ, Mack S, Cammarata M, Krupin O, Messerschmidt M, Holmes M, Rowen M, Schlotter W, Moeller S, Turner JJ. Absolute pulse energy measurements of soft x-rays at the Linac Coherent Light Source. Opt Express 2014; 22:21214-26. [PMID: 25321502 DOI: 10.1364/oe.22.021214] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
This paper reports novel measurements of x-ray optical radiation on an absolute scale from the intense and ultra-short radiation generated in the soft x-ray regime of a free electron laser. We give a brief description of the detection principle for radiation measurements which was specifically adapted for this photon energy range. We present data characterizing the soft x-ray instrument at the Linac Coherent Light Source (LCLS) with respect to the radiant power output and transmission by using an absolute detector temporarily placed at the downstream end of the instrument. This provides an estimation of the reflectivity of all x-ray optical elements in the beamline and provides the absolute photon number per bandwidth per pulse. This parameter is important for many experiments that need to understand the trade-offs between high energy resolution and high flux, such as experiments focused on studying materials via resonant processes. Furthermore, the results are compared with the LCLS diagnostic gas detectors to test the limits of linearity, and observations are reported on radiation contamination from spontaneous undulator radiation and higher harmonic content.
Collapse
|
5
|
Kubacka T, Johnson JA, Hoffmann MC, Vicario C, de Jong S, Beaud P, Grubel S, Huang SW, Huber L, Patthey L, Chuang YD, Turner JJ, Dakovski GL, Lee WS, Minitti MP, Schlotter W, Moore RG, Hauri CP, Koohpayeh SM, Scagnoli V, Ingold G, Johnson SL, Staub U. Large-Amplitude Spin Dynamics Driven by a THz Pulse in Resonance with an Electromagnon. Science 2014; 343:1333-6. [DOI: 10.1126/science.1242862] [Citation(s) in RCA: 213] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
6
|
Tobey R, Wall S, Först M, Bromberger H, Khanna V, Turner J, Schlotter W, Trigo M, Krupin O, Lee WS, Chuang YD, Moore R, Cavalieri A, Wilkins SB, Zeng H, Mitchell JF, Dhesi S, Cavalleri A, Hill JP. Measuring 3D magnetic correlations during the photo-induced melting of electronic order in La 0.5Sr 1.5MnO 4. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20134103003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
7
|
Cho BI, Engelhorn K, Vinko SM, Chung HK, Ciricosta O, Rackstraw DS, Falcone RW, Brown CRD, Burian T, Chalupský J, Graves C, Hájková V, Higginbotham A, Juha L, Krzywinski J, Lee HJ, Messersmidt M, Murphy C, Ping Y, Rohringer N, Scherz A, Schlotter W, Toleikis S, Turner JJ, Vysin L, Wang T, Wu B, Zastrau U, Zhu D, Lee RW, Nagler B, Wark JS, Heimann PA. Resonant Kα spectroscopy of solid-density aluminum plasmas. Phys Rev Lett 2012; 109:245003. [PMID: 23368333 DOI: 10.1103/physrevlett.109.245003] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2012] [Indexed: 06/01/2023]
Abstract
The x-ray intensities made available by x-ray free electron lasers (FEL) open up new x-ray matter interaction channels not accessible with previous sources. We report here on the resonant generation of Kα emission, that is to say the production of copious Kα radiation by tuning the x-ray FEL pulse to photon energies below that of the K edge of a solid aluminum sample. The sequential absorption of multiple photons in the same atom during the 80 fs pulse, with photons creating L-shell holes and then one resonantly exciting a K-shell electron into one of these holes, opens up a channel for the Kα production, as well as the absorption of further photons. We demonstrate rich spectra of such channels, and investigate the emission produced by tuning the FEL energy to the K-L transitions of those highly charged ions that have transition energies below the K edge of the cold material. The spectra are sensitive to x-ray intensity dependent opacity effects, with ions containing L-shell holes readily reabsorbing the Kα radiation.
Collapse
Affiliation(s)
- B I Cho
- Lawrence Berkeley National Laboratory, 1 Cyclotron Road, California 94720, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
8
|
Ciricosta O, Vinko SM, Chung HK, Cho BI, Brown CRD, Burian T, Chalupský J, Engelhorn K, Falcone RW, Graves C, Hájková V, Higginbotham A, Juha L, Krzywinski J, Lee HJ, Messerschmidt M, Murphy CD, Ping Y, Rackstraw DS, Scherz A, Schlotter W, Toleikis S, Turner JJ, Vysin L, Wang T, Wu B, Zastrau U, Zhu D, Lee RW, Heimann P, Nagler B, Wark JS. Direct measurements of the ionization potential depression in a dense plasma. Phys Rev Lett 2012; 109:065002. [PMID: 23006275 DOI: 10.1103/physrevlett.109.065002] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2012] [Indexed: 06/01/2023]
Abstract
We have used the Linac Coherent Light Source to generate solid-density aluminum plasmas at temperatures of up to 180 eV. By varying the photon energy of the x rays that both create and probe the plasma, and observing the K-α fluorescence, we can directly measure the position of the K edge of the highly charged ions within the system. The results are found to disagree with the predictions of the extensively used Stewart-Pyatt model, but are consistent with the earlier model of Ecker and Kröll, which predicts significantly greater depression of the ionization potential.
Collapse
Affiliation(s)
- O Ciricosta
- Department of Physics, Clarendon Laboratory, University of Oxford, Oxford, United Kingdom
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
9
|
Rehor G, Conca A, Schlotter W, Vonthein R, Bork S, Bode R, Hüll M, Plewnia C, Di Pauli J, Prapotnik M, Peters O, Peters J, Eschweiler GW. [Relapse rate within 6 months after successful ECT: a naturalistic prospective peer- and self-assessment analysis]. Neuropsychiatr 2009; 23:157-163. [PMID: 19703381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
BACKGROUND Up to 100% relapse rate after successful electroconvulsive therapy (ECT) poses a challenge for patients and psychiatrists. The aim of the study was to evaluate the outcome of patients affected by major depression after the successful course of acute ECT. METHODS 84 patients recruited in a randomized double blind multicenter study designed to investigate the optimal stimulation placement in acute ECT had a follow up under naturalistic conditions between the 5th and 7th month. Outcome, maintenance therapy and patients; attitude were evaluated with semi structured questionnaires by patients and the study raters. RESULTS 82.14% (68/84) questionnaires of the patients and 83.3% (70/84) of the rater were returned. 98% of the patients had at least one antidepressant; only in 23% (20/68) lithium was prescribed. 35% (7/20) of the patients with lithium and 57% (16/28) without lithium had a relapse within the first 6 months (OR 0.6) in a median of 2.5 months. Only one institution offered maintenance ECT in 8.3% (7/84) patients. For 52.2% of the patients ECT was a helpful treatment an 49.3% would recommend the therapy to their relatives. The vast majority (59.4%) wishes a better information about the ECT and 21.4% feel frightening about the therapy. CONCLUSIONS The results show a high relapse rate and highlight the meaning of maintenance medication especially for a lithium combination therapy, as stated before. In regard to the subjective sensation the patients claim a better education about the ECT and anyway one of four patients feel frightening about the therapy.
Collapse
|
10
|
Bartels M, Kastrup A, Schlotter W, Plewnia C. Treatment of tics in Tourette’s syndrome with aripiprazole. Pharmacopsychiatry 2004. [DOI: 10.1055/s-2003-825264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
11
|
Eschweiler GW, Wegerer C, Schlotter W, Spandl C, Stevens A, Bartels M, Buchkremer G. Left prefrontal activation predicts therapeutic effects of repetitive transcranial magnetic stimulation (rTMS) in major depression. Psychiatry Res 2000; 99:161-72. [PMID: 11068197 DOI: 10.1016/s0925-4927(00)00062-7] [Citation(s) in RCA: 130] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
There is evidence that repetitive transcranial magnetic stimulation (rTMS) applied to the prefrontal cortex has antidepressive properties. In the present study we evaluated the clinical status and the hemodynamic responses during mental work in the prefrontal cortex before therapeutic rTMS. Twelve patients diagnosed with major depression (DSM-IV) were randomized in a sham-controlled cross-over treatment protocol of 4 weeks' duration consisting of two periods of 5 days with rTMS separated by 9 days of no stimulation. rTMS (10 Hz) was applied to the left dorsolateral prefrontal cortex. Hemodynamic changes in the prefrontal cortex during mental work were evaluated by multi-site near-infrared spectroscopy (NIRS). Scores on the Hamilton Depression Rating Scale (HAMD) decreased significantly by -5.4 points after 5 days of active stimulation, whereas it did not change (+1.6 points) after sham stimulation. Absence of a task-related increase of total hemoglobin concentrations at the stimulation site (P<0.005), but not at other locations, before the first active rTMS significantly predicted the clinical response to active rTMS. Clinical benefits of rTMS are predicted by low local hemodynamic responses and support the idea of activation-dependent targeting of rTMS location.
Collapse
Affiliation(s)
- G W Eschweiler
- Eberhard-Karls-Universität Tübingen, Clinic of Psychiatry and Psychotherapy, 24, 72076 Tübingen, Osianderstrasse, Germany.
| | | | | | | | | | | | | |
Collapse
|