| Project/Area Number |
12440057
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Astronomy
|
|---|
| Research Institution | RIKEN |
|---|
Principal Investigator |
OTANI Chiko RIKEN, Kawase Initiative Research Unit, Unit Researcher, 川瀬独立主幹研究ユニット, ユニット研究員 (50281663)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
SATO Hiromi RIKEN, Image Information Division, Resercher, イメージ情報技術開発室, 研究員 (20300874)
TAKIZAWA Yoshiyuki RIKEN, Image Information Division, Contract Researcher, イメージ情報技術開発室, 研究協力員 (70312246)
SHIMIZU Hirohiko RIKEN, Image Information Division, Vice-Researcher, イメージ情報技術開発室, 室長(副主任研究員待遇) (50249900)
KAWASE Kodo RIKEN, Kawase Initiative Research Unit, Initiative Researcher, 川瀬独立主幹研究ユニット, 独立主幹研究員 (00296013)
OKU Takayuki RIKEN, Image Information Division, Contract Researcher, イメージ情報技術開発室, 研究協力員 (10301748)
池田 時浩 理化学研究所, 原子物理研究室, 研究員 (80301745)
|
|---|
| Project Period (FY) |
2000 – 2002
|
| Project Status |
Completed (Fiscal Year 2002)
|
| Budget Amount *help |
¥16,400,000 (Direct Cost: ¥16,400,000)
Fiscal Year 2002: ¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 2001: ¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2000: ¥10,000,000 (Direct Cost: ¥10,000,000)
|
|---|
| Keywords | Superconducting Tunnel Junction / Detector / Ultraviolet / One-photon Spectroscopy |
|---|
| Research Abstract |
We developed and fabricated Superconducting Tunnel junction (STI) detectors for one-photon ultraviolet spectroscopy by applying the fabrication process developed for fabricating STJ detectors for X-ray spectroscopy. We introduced the following new processes for the energy-dispersive detection of ultraviolet photons
1.the process to remove the covering SiO2 layers accumulated to avoid the damage
2.the anodization process of the junction edge to suppress the leakage current
3.the increase of the thickness of Al-trapping layers.
No.1 caused the direct illumination of ultraviolet photons without absorption by the covering layer. No.2 made it possible to reach down to the leakage current of lnA for the junctions with the critical current of 1 kA/cm^2. No.3 caused the amplification of the signal charges by more than a factor of 5. We succeeded to detect one photon in energy of 47-280 eV by the detector. The energy resolution was 18 eV at 55 eV. In addition, we clarified that the energy resolution of the detector became worse due to the high capacitance of readout stainless coaxial wires. After replacing them, we confirmed that the energy resolution reduced to 1/4. Moreover, we trided to detect optical photons. We succeeded the detection and estimated the energy resolution of 2.4 eV at 13 eV (λ/Δλ〜5) by using the multi-photon events (2-5 photons per event).
|
