9:30 AM - 9:45 AM
[7a-S43-3] Calorimetry of Heavy Charged Particle by superconducting transition edge sensor
Keywords:superconductivity, transition edge sensor
Precision measurement of the absorbed dose in heavy ion beam is required to realize the effective heavy ion cancer therapy. Calorimetry of the absorbed energy in heavy ion is very effective for minimizing of the uncertainty in dose rate measurement. Therefore we suggest the superconducting transition edge sensor (TES) for the precision heavy charged particle detector. Using the Ir/Au-TES coupled to a tin absorber, we have succeeded to detect the helium ions and the carbon ions which were injected from HIMAC (Heavy Ion Medical Accelerator in Chiba) in National Institute of Radiological Sciences. In the experiment of the helium ions beam injection (100 MeV/u), LET (Linier Energy Transfer) inside the tin absorber which is 0.3 mm thick, was adjusted by changing attenuation length of the aluminum attenuator. Although the incident signals are fully saturated because the temperature change is beyond the transition region, the saturation time of the signal is reflected the incident energy of the injected heavy ions. As a result we confirmed that the saturation time of the observed incident signal depends on the loss energy inside the tin absorber, which is calculated from the integral of LET. Based on these results, we consider that TES is the promising detector for precision calorimetry of heavy charged particle.