Making an X-ray Undulator Ready for Commissioning: Procedures Subsequent to Fabrication until Tunnel Installation
Abstract
In
this study, sequence of events for an X-ray undulator generating Free Electron
Laser (FEL) pulses down to hard X-rays of the electromagnetic spectrum, are
discussed in detail. As soon as an undulator arrives to a Magnetic Measurements
Hutch (MMH), a series of treatment steps start to make it ready for commissioning,
beginning with a high-precision magnetic alignment procedure. Once Hall probe
and undulator are accurately aligned to each other, then gap-dependent measurements
begin to create tuning lists. After completion of mechanical tuning of poles, MMH
3D-coordinates have to be transformed to the coordinates of tunnel, where many
undulator cells will be sequenced one after another along a linear path. Here,
all optical, mechanical and magnetic procedures that an X-ray undulator experiences
before commissioning, are thoroughly explained. Furthermore, effects of
different types of Hall probes on magnetic measurements, are discussed as well.
Finally, whole algorithm subsequent to fabrication until tunnel installation
(i.e. optical and magnetic alignment, pole tuning, phase jitter therapy etc.),
are summarized by means of the results of magnetic measurements taken in three
identical MMHs of European XFEL facility.
References
- Abela, R et al. (2007) The European X-ray free-electron laser, Technical Design Report, ISBN 978-3-935702-17-1.
- Altarelli, M. (2010) European XFEL status of technical developments, 4th European XFEL Users’ Meeting, Hamburg, Germany.
- Elleaume, P et al. (2000) Design considerations for a 1 Å SASE undulator, Nuclear Instruments and Methods in Physics Research A, 455, 503-523.
- Ketenoğlu, B et al. (2015) European XFEL Users’ Meeting 2015, Hamburg, Germany.
- Ketenoğlu, B. (2015) European XFEL WP71 Reports, Report No: WP71/2015/09, Hamburg, Germany.
- Li, Y et al. (2015) Magnetic measurement techniques for the large-scale production of undulator segments for the European XFEL, Synchrotron Radiation News, 28(3), 23 – 28.
- Patterson, B. D. and Abela, R. (2010) Novel opportunuties for time-resolved absorption spectroscopy at the X-ray free electron laser, Physical Chemistry Chemical Physics, 12, 5647-5652.
- Robinson, I et al. (2010) X-ray beams with high coherence, New Journal of Physics, 12, 035002.
BİR X-IŞINI SALINDIRICISININ İŞLETİME HAZIR HALE GETİRİLMESİ: ÜRETİMİN ARDINDAN TÜNELE KURULANA KADAR İZLENEN PROSEDÜRLER
Abstract
Bu çalışmada, elektromanyetik spektrumun sert
X-ışınları bölgesinde Serbest Elektron Lazeri (SEL) üreten bir X-ışını
salındırıcısının başından geçen olaylar silsilesi detaylıca tartışılmıştır. Bir
salındırıcı Manyetik Ölçüm Laboratuvarı’na geldikten sonra işletime hazır hale
gelebilmesi için, yüksek hassasiyetli manyetik hizalama prosedürü ile başlayan
bir dizi iyileştirme adımı başlar. Hall probu ve salındırıcı birbirlerine
hassas bir şekilde ayarlandıktan sonra, ayar listelerinin oluşturulabilmesi
için salındırıcı yapının farklı farklı açıklık değerleri için ölçümler başlar. Kutupların
mekanik olarak ayarlanmasından sonra, Manyetik Ölçüm Laboratuvarı’nın 3 boyutlu
koordinatları, salındırıcıların doğrusal bir yol boyunca ard arda
sıralanacakları tünel koordinatlarına dönüştürülmelidir. Burada, bir X-ışını
salındırıcısının işletimden önce başından geçen tüm optik, mekanik ve manyetik
prosedürler tüm detaylarıyla açıklanmıştır. Ayrıca, birbirinden farklı tipte
Hall problarının manyetik ölçümler üzerine etkileri de tartışılmıştır. Sonuç
olarak, üretimin ardından tünele kurulana kadarki tüm algoritma (optik ve
manyetik hizalama, kutup ayarlanması, faz hatalarının iyileştirilmesi vb.), European
XFEL tesisinin özdeş üç Manyetik Ölçüm Laboratuvarı’nda alınan sonuçlar ile
özetlenmiştir.
References
- Abela, R et al. (2007) The European X-ray free-electron laser, Technical Design Report, ISBN 978-3-935702-17-1.
- Altarelli, M. (2010) European XFEL status of technical developments, 4th European XFEL Users’ Meeting, Hamburg, Germany.
- Elleaume, P et al. (2000) Design considerations for a 1 Å SASE undulator, Nuclear Instruments and Methods in Physics Research A, 455, 503-523.
- Ketenoğlu, B et al. (2015) European XFEL Users’ Meeting 2015, Hamburg, Germany.
- Ketenoğlu, B. (2015) European XFEL WP71 Reports, Report No: WP71/2015/09, Hamburg, Germany.
- Li, Y et al. (2015) Magnetic measurement techniques for the large-scale production of undulator segments for the European XFEL, Synchrotron Radiation News, 28(3), 23 – 28.
- Patterson, B. D. and Abela, R. (2010) Novel opportunuties for time-resolved absorption spectroscopy at the X-ray free electron laser, Physical Chemistry Chemical Physics, 12, 5647-5652.
- Robinson, I et al. (2010) X-ray beams with high coherence, New Journal of Physics, 12, 035002.
Details
| Primary Language | English |
|---|---|
| Subjects | Engineering |
| Journal Section | Research Articles |
| Authors | |
| Publication Date | December 31, 2018 |
| Submission Date | May 25, 2017 |
| Acceptance Date | December 17, 2018 |
| Published in Issue | Year 2018 Volume: 23 Issue: 3 |
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