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High-precision measurements of
Superconducting cavities
Anirban (Krish)na Bhattacharyya
FREIA / HIGH ENERGY PHYSICS
Uppsala University
FREIA
UU-ESS-IPNO-CERN &
Industry Collaboration(Thales, Electrosys, DB Elettronica, Siemens, NXP, ESRF, CERN)RF Source Development
(vacuum tube amplifier, solid-
state amplifier, SSA module &
combiner optimization)
High-power Spoke Cavity Testing (tuning system, dynamic load, electron emission, mechanical parameters and multipacting)
Digital LLRF
Combined THz/X-ray
source
Present & Future
• Acceptance testing of spoke
cryomodule ✓
• Test of prototype spoke
cryomodule valve box✓
• Test of prototype Single spoke
and Double Spoke
superconducting cavities✓
• Testing of crab cavities for
LHC upgrade
• ESS neutrino super beam.
Liquifier (He, N)
3
Reflection coefficient
��
��
à ��
��
κ � 1 � ���δ
κ � 1 � ���δδ
���� � ��
������
tan θ�
Γ$ �1
1 � κ
� Γ$$ κ
1 � κ
κ ��
����
1
1%
� 1Γ
$$
Γ$critical coupling κ 1
over coupling κ & 1under coupling κ ' 1
8