Heavy ions (carbon ions) are accelerated up to 70% of light speed and are subsequently irradiated into deep tumors within the patient. The procedure is painless.
The medical accelerator being introduced into Gunma University is designed as a relatively compact prototype for installation in several regions throughout Japan. This project has received worldwide attention from health officials and experts in radiotherapy.

| Site | Gunma University Showa Campus, Maebashi, Japan | 
|---|---|
| Construction | Structure Reinforced concrete, partially steel-framed | 
| Number of floors | 1 below and 2 above ground | 
| Building area | 3130 ㎡ | 
| Total floor area | 6280 ㎡ | 
| Main rooms | Lobby, waiting room, control hall, irradiation room 1 (horizontal port), irradiation room 2 (horizontal and vertical ports), irradiation room 3 (vertical port), irradiation room 4 (vertical, R&D port), dispensary room, CT simulator room, staff room, conference room, accelerator room, machine room. | 
| April 2006 | Basic design of the facility | 
|---|---|
| January 2007 | Contract for apparatus | 
| August 2008 | Device carrying | 
| October 2008 | Building completion | 
| March 2010 | Treatment System Installation | 
| March 2010 | Clinical trials begin |