Preliminary study of injection transients in the TPS storage ring

Chen, C H; Liu, Y C; Chen, J Y; Chiu, Mau-Sen; Tseng, Fan-Hsin; Fann, Sam; Liang, Cheng-Chih; Huang, Chun-Shien; Lee, T Y; Chen, B Y; Tsai, Hung-Jen; Luo, G.H.; Kuo, C.C.

doi:10.1088/1742-6596/874/1/012060

Cited by 3 publications

(1 citation statement)

References 2 publications

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“…to decrease beam perturbations are still going on in an attempt to avoid any dip of photon flux during injection [26]. After the improvement in 2017, betatron oscillation amplitudes are ±400 µm horizontally and ±100 µm vertically.…”

Section: Jinst 14 T01002mentioning

confidence: 99%

Investigation and elimination of orbit distortion sources to achieve a high-quality photon beam at the Taiwan Photon Source

Huang¹,

Chiu²,

Hu³

et al. 2019

J. Inst.

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High beam stability is important to obtain a brilliant photon beam. There are many sources which can negatively affect beam stability, such as mechanical vibrations, electrical noise and malfunction of power supplies, etc. These sources are hard to avoid completely by careful design and may appear any time after installation work. To identify possible sources and study their effect to beam motion, a systematic study was performed starting with specific hardware installations. A method was developed to quickly identify locations of multiple perturbations and to observe vibrations and low-level undesired alternating magnetic fields. As for mechanical vibrations, a severe beam motion during beam commissioning was caused by quadrupole and vacuum chamber vibrations. The transfer of such vibrations to the beam were simulated by forced-shaking. Inversion of the response matrix together with singular value decomposition could identify perturbations by electrical noise originating from a nearby radio frequency system and cooling fans. After eliminating these detrimental factors, a high-quality beam, stable to less than 10% of the beam size, was achieved at the Taiwan Photon Source.

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Section: Jinst 14 T01002mentioning

confidence: 99%

Investigation and elimination of orbit distortion sources to achieve a high-quality photon beam at the Taiwan Photon Source

Huang¹,

Chiu²,

Hu³

et al. 2019

J. Inst.

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Current status of the TPS and its future prospects

Hsu¹,

Liu²,

Kuo³

et al. 2019

AIP Conference Proceedings

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Beam motion and photon flux dips during injection at the Taiwan Photon Source

Huang

Hsu

Chen

et al. 2019

J. Phys.: Conf. Ser.

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The Taiwan photon source (TPS) is a 3 GeV synchrotron light source now in routine operation at the NSRRC. At the beginning of beam commissioning, significant photon flux dips could be observed at injection due to a blow-up of the beam size. To eliminate this transient effect, all four kickers were rematched. The leakage field was shielded and the induced current loops at vacuum chambers in the injection area were also eliminated. These efforts reduced the horizontal betatron oscillations and orbit distortions to around one-tenth. In order to decrease the recovery time of photon dips during injection, the operational chromaticity was reduced to improve incoherent effects. After all those improvements, the photon flux dips during injection dropped to 30 % and the recovery time to less than 1 msec.

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Preliminary study of injection transients in the TPS storage ring

Cited by 3 publications

References 2 publications

Investigation and elimination of orbit distortion sources to achieve a high-quality photon beam at the Taiwan Photon Source

Investigation and elimination of orbit distortion sources to achieve a high-quality photon beam at the Taiwan Photon Source

Current status of the TPS and its future prospects

Beam motion and photon flux dips during injection at the Taiwan Photon Source

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