  The Taishan Antineutrino Observatory (JUNO-TAO, or TAO) is a satellite
detector for the Jiangmen Underground Neutrino Observatory (JUNO). Located near
the Taishan reactor, TAO independently measures the reactor's antineutrino
energy spectrum with unprecedented energy resolution. To achieve this goal,
energy response must be well calibrated. Using the Automated Calibration Unit
(ACU) and the Cable Loop System (CLS) of TAO, multiple radioactive sources are
deployed to various positions in the detector to perform a precise calibration
of energy response. The non-linear energy response can be controlled within
0.6% with different energy points of these radioactive sources. It can be
further improved by using $^{12}\rm B$ decay signals produced by cosmic muons.
Through the energy non-uniformity calibration, residual non-uniformity is less
than 0.2%. The energy resolution degradation and energy bias caused by the
residual non-uniformity can be controlled within 0.05% and 0.3%, respectively.
In addition, the stability of other detector parameters, such as the gain of
each silicon photo-multiplier, can be monitored with a special ultraviolet LED
calibration system.
