Charge conversion film for ion beam charge conversion device

A technology of charge conversion and ion beam, which is applied in ion beam tubes, processing with charge exchange devices, circuits, etc. It can solve the problems of inability to make thin films, difficult control of film thickness, large deviation of film thickness, etc., and achieve easy processing , Excellent heat resistance and high physical strength

Pending Publication Date: 2019-06-11
KANEKA CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, beryllium is very expensive, and there is a problem that since dust containing beryllium shows toxicity when inhaled into the human body, there is a concern of causing a fatal chronic disease called chronic beryllium disease, etc.
Therefore, there is a problem that the charge conversion film after beam irradiation is radioactively activated, and it takes several months until the radiation management area can be taken out.
However, since pow

Method used

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  • Charge conversion film for ion beam charge conversion device
  • Charge conversion film for ion beam charge conversion device
  • Charge conversion film for ion beam charge conversion device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0083] Examples are shown below, and the embodiment of the present invention will be further described in detail. Of course, the present invention is not limited by these embodiments, and there may be various forms for the details, which is obvious.

[0084] (Physical property evaluation method)

[0085]

[0086] The thickness of the charge conversion film of the present invention and the polymer thin film used as a raw material has an error of about ±5 to 10%. Therefore, the film thicknesses of the charge conversion film and the polymer thin film were measured at 10 different points in each sample, and the arithmetic mean thereof was taken as the thickness of each sample.

[0087]

[0088] Calculate the volume (cm 3 ), and separately measure the weight (g) of the charge conversion membrane, from the density (g / cm 3 ) = weight (g) / volume (cm 3 ) to calculate the density of the charge conversion film. In addition, the weight per unit area (mg / cm 2 ) = weight (mg) / ...

manufacture example 1

[0094] Mix 20 g of acetic anhydride and 10 g of isoquinoline in 100 g of 18 wt % DMF solution of polyamic acid synthesized by pyromellitic anhydride and 4,4'-diaminodiphenyl ether at a molar ratio of 1 / 1. The curing agent is stirred and degassed by centrifugation, and cast on aluminum foil. From stirring to defoaming, cooling to 0°C was performed. The laminated body of the aluminum foil and the polyamic acid solution was heated at 120° C. for 150 seconds, and at 300° C., 400° C., and 500° C. for 30 seconds each, and then the aluminum foil was removed to produce polyimide films with different thicknesses. Regarding the thickness of the polyimide film, several types of films having different thicknesses in the range of 25 to 200 μm were produced by adjusting the casting speed and the like.

Embodiment 1

[0096] Four kinds of polyimide films having a thickness ranging from 25 to 200 μm were heated up to 1000° C. at a rate of 10° C. / min in nitrogen gas in an electric furnace, and held at 1000° C. for 1 hour to perform pretreatment. Next, the obtained carbonized film was placed inside a cylindrical carbon film heater, and heated to 2400° C. at a temperature increase rate of 20° C. / min. After reaching this temperature, the power to the heater was turned off, and cooled to room temperature to prepare charge conversion films 1 to 4 . The treatment was performed under a pressure of 0.1 MPa in an argon atmosphere.

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Abstract

The purpose of the present invention is to provide a high-quality charge conversion film that is for an ion beam charge conversion device, that has high heat resistance and thermal conductivity, and that can withstand irradiation by a beam over a long period of time. The present invention is a charge conversion film that is for an ion beam charge conversion device, that is a carbon film produced by a polymer firing method, and that has a film thickness of 10-150 mum. The present invention also includes charge conversion films that are for an ion beam charge conversion device, that are a carbonfilm having a thermal conductivity of 300 W/mK or more in the film surface direction at 25 DEG C, and that have a film thickness of 10-150 mum. The charge conversion films preferably have a density of 0.90-2.26 g/cm3, a weight per unit area of 1.5-30 mg/cm2, and an area of 4 cm2 or more.

Description

technical field [0001] The present invention relates to a charge conversion membrane of a charge conversion device used in an ion beam accelerator. Background technique [0002] In order to efficiently accelerate a beam in an ion beam accelerator, it is necessary to remove electrons from ions and adjust to a target valence. In order to remove electrons from ions and adjust to a proper valence, charge conversion membranes play an important role. As charge conversion films, liquid lithium, beryllium, carbon films, carbon-boron composite films, carbon nanotube composite films, and carbon-organic composite films have been reported (Non-Patent Document 1). [0003] A charge conversion film made of liquid lithium is very expensive and complicated because lithium reacts with water, requires a rare gas atmosphere completely free of moisture, and requires a special device (Non-Patent Document 1). [0004] In addition, beryllium is a light element and has high charge conversion effi...

Claims

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Application Information

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IPC IPC(8): G21K1/14G21K1/00H05H7/08H05H13/04
CPCG21K1/00H05H7/08C01B32/05H05H2007/088H05H2007/005G21K1/14H05H7/10H05H7/00H05H13/04B29D7/01B32B5/14B32B9/007B32B9/041B32B15/00B32B33/00B32B2307/302B32B2307/718B32B2313/04C08J7/08C08J2333/24C08J2337/00C08J2339/00H01J27/022H01J2237/004
Inventor 村上睦明立花正满多多见笃长谷部裕雄
Owner KANEKA CORP
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