JACoW is a publisher in Geneva, Switzerland that publishes the proceedings of accelerator conferences held around the world by an international collaboration of editors.
TY - CONF AU - Pandey, A. AU - Ahuja, R. AU - Chaudhari, G.K. AU - Chaudhary, B.B. AU - Dutt, R.N. AU - Ghosh, S. AU - Karmakar, B. AU - Karmakar, J. AU - Kumar, R. AU - Mathuria, D.S. AU - Patra, P. AU - Potukuchi, P.N. AU - Rai, A. AU - Sahu, B.K. AU - Saini, S.K. AU - Sharma, A. AU - Sonti, S.K. AU - Suman, S.K. ED - Saito, Kenji ED - Xu, Ting ED - Sakamoto, Naruhiko ED - Lesage, Ana ED - Schaa, Volker R.W. TI - Operational Experience with the Mechanical Tuner Systems in the Superconducting Linac at IUAC J2 - Proc. of SRF2021, East Lansing, MI, USA, 28 June-02 July 2021 CY - East Lansing, MI, USA T2 - International Conference on RF Superconductivity T3 - 20 LA - english AB - The phase locking of the QWRs by dynamic phase control method in the superconducting linac at IUAC is done in a faster time scale. The slow frequency drifts (few hundreds of ms) are corrected using a niobium bellows tuner attached at the open end of the cavity. Initially, the tuners in the cavities were operated using helium gas. This system had the limitation of non-linearity, hysteresis and slow response due to which the cavities could not be phase locked at higher fields. To address this, piezo based tuning system was implemented in the cavities of the 2nd and 3rd linac modules. But due to space constraints, the same could not be used in the 1st linac module and the buncher modules. For them, the helium gas based system was continued, albeit with suitable modifications. The old flow control valves which operated with DC voltages were replaced with valves operating in pulsed mode and controlled by varying the duty cycle of the input pulses. The above mentioned limitations were overcome by using this PWM based technique and this enabled phase locking at higher gradients. This paper presents our operational experience with all the different tuning systems and their comparison. PB - JACoW Publishing CP - Geneva, Switzerland SP - 809 EP - 814 KW - controls KW - cavity KW - linac KW - operation KW - resonance DA - 2022/10 PY - 2022 SN - 2673-5504 SN - 978-3-95450-233-2 DO - doi:10.18429/JACoW-SRF2021-THPCAV011 UR - https://jacow.org/srf2021/papers/thpcav011.pdf ER -