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RIS citation export for THPCAV011: Operational Experience with the Mechanical Tuner Systems in the Superconducting Linac at IUAC

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  -