The High Energy Photon Source (HEPS), is the first
fourth-generation storage ring light source being built in the
suburb of Beijing, China. The storage ring was designed with the
emittance lower than 60 pm.rad with a circumference of 1.36 km and
beam energy of 6 GeV. Its injector contains a 500 MeV S-band
Linac and a 454 m booster which was designed as an accumulator at
the extraction energy. In the energy ramping control design of HEPS
booster, the ramping process was programed to be able to stop and
stay at any energy between the injection energy and the extraction
energy. This feature enables us to conduct energy-dependent machine
studies and ramping curve optimization. The beam commissioning of
HEPS Linac finished in June, 2023. And the beam commissioning of
booster started in the end of July, 2023. In November 17, main
target values proposed in the preliminary design report has been
reached. The high-level applications (HLAs) are essential tools for
beam commissioning. The development of HLAs, which are based on the
framework named Python accelerator physics application set
(Pyapas), started in the end of 2021. The HEPS physics team
spent more than one year to develop and test the HLAs to meet the
requirements of beam commissioning of the booster. Thanks to the
modular design, the principle based on physical quantities, and the
ability of running simulation models online from the Pyapas,
the development efficiency and reliability of the HLAs have been
greatly improved. In particular, the principle based on physical
quantities allows us to control the beam more intuitively.