JPH0221599A - Controlled parameter display setter for charged particle beam accelerator - Google Patents

Abstract

PURPOSE:To facilitate change of parameters used for obtaining an optimum particle beam by converting controlled parameters into a biaxial coordinate system to display mutual relation illustration. CONSTITUTION:In a magnetic disc device 2c, all controlled parameters used in the past for controlling operation of cyclotron 1 is stored preliminarily. A CPU 2a statistically analyzing the old controlled parameters to obtain a relative coefficient matrix, and they are converted into biaxial coordinate system (X-Y coordinate system) by use of the old controlled parameters and the matrix. Based on the actual controlled parameters, each composing an element of cyclotron is controlled. Since the mutual relation between the respective controlled parameters is displayed on the system, it is understood immediately which controlled parameter should be changed according to whether the plot point after the change is apart from the old plot group or not.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a setting display device for setting and displaying adjustment parameters used in controlling the operation of a charged particle beam accelerator, particularly a cyclotron.

(Prior Art) In general, in a cyclotron, ffff1 parameters (operating parameters) are set for each element that makes up the cyclotron (for example, main coil, Q magnet, deflector, etc.), and each component is adjusted based on these adjustment parameters. is under control.

When controlling the operation of a cyclotron, various adjustment parameters at the current moment are displayed as numerical values on the display, and the current value of the charged particle beam is detected (hereinafter this current value is referred to as the detected beam current value). is displayed, and by comparing these adjustment parameters and detected beam current values, the operator adjusts (changes) the adjustment parameters so as to obtain the optimum beam current value.

(Problem to be Solved by the Invention) In the conventional case, as described above, since the adjustment parameters (numeric values) and the detected beam current values are simply displayed on the display, the r! The A-group cannot be directly recognized, and as a result, adjusting the parameters requires skill, which not only imposes an excessive burden on the operator, but also takes time to adjust the charged particle beam.

SUMMARY OF THE INVENTION An object of the present invention is to provide an adjustment parameter display and setting device that allows parameters to be easily adjusted.

(Means for Solving the Problems) According to the present invention, a storage means is used to set and display a plurality of adjustment parameters used when controlling the operation of a charged particle beam accelerator, and stores the adjustment parameters;
A display means for displaying the adjustment parameter on a two-axis coordinate system; a setting means for setting the adjustment parameter; It has calculation means for converting into a two-axis coordinate system, and displays the converted values of the adjustment parameters currently used for operational control of the charged particle beam accelerator and the converted values of other adjustment parameters. A device for displaying and setting adjustment parameters for a charged particle beam accelerator is obtained.

(Function) In the present invention, the adjustment parameters stored in the storage means are used, the correlation coefficients between these adjustment parameters are calculated by the calculation means, and the above-mentioned adjustment parameters are displayed on the display means using the correlation coefficients. Convert to a two-axis coordinate system.

The operator compares the detected beam current value with the converted value on the two-axis coordinate system in which this correlation coefficient is taken into consideration, and changes the adjustment parameter. This new adjustment parameter is stored in the storage means, and the calculation means This new adjustment parameter is converted into a two-axis coordinate system on the display means using the above-mentioned correlation coefficient. At this time, the adjustment parameters currently used to control the operation of the charged particle beam accelerator and other adjustment parameters are displayed separately. Then, the adjustment parameters are changed in the same manner and displayed on the display means.

(Example) The present invention will be explained below with reference to Examples.

First, referring to FIG. 1, a control computer system 2 is connected to a charged particle beam accelerator system 1 such as a cyclotron, and this control computer system 2 includes an adjustment parameter input device 3 and a display device (CRT). )4 are connected.

The control computer system 2 includes a central processing unit (CPU).
) 2a, a memory 2b storing a control program, and a magnetic disk device 2c, and the input device 3 described above.
and CI”tT4 are interfaces 2d and 2, respectively.
It is connected to CP LJ 2 a via e. In addition, CP tJ 2 a has interfaces 2f and 1a.
A beam current detection probe 1b is connected via.

The magnetic disk device 2c stores in advance all the adjustment parameters used for the operation control of the cyclotron 1 in the past, and the CPU 2a statistically analyzes these past adjustment parameters and calculates the equation (1). Find the correlation coefficient matrix A shown in .

That is, the correlation between past adjustment parameters is determined.

Note that the correlation coefficient matrix A is obtained in advance based on past adjustment parameters, and is stored in the memory 2b based on input from the operator.
It may be stored in .

Using the above-mentioned past adjustment parameters and correlation coefficient matrix, the CPU 2a creates a two-axis coordinate system (X-Y
coordinate system).

Here, P, , P, . . . P7 do not indicate adjustment parameters at a certain point in time during cyclotron operation.

Therefore, if even one adjustment parameter changes, a new plot point is displayed on the X-Y coordinate system.

Here, when starting the operation control of the cyclotron 1,
New adjustment parameters are input from the input device 3 (hereinafter referred to as current adjustment parameters). Then, this current adjustment parameter (P, ′, P2 ..., P
, '), each component of the cyclotron is controlled. At this time, CP LJ 2 a is the above-mentioned (2nd
) convert the current adjustment parameters into a two-axis coordinate system.

On the other hand, the current value of the charged particle beam in the cyclotron 1 is detected by the probe 1b and inputted to the CPU 2a as a detected beam current value.

CP tJ 2 a sequentially displays plot points obtained by converting past adjustment parameters into the X-Y coordinate system on the CRT 4 as shown in FIG. 2(b) (indicated by +). Furthermore, plot points obtained by converting the current adjustment parameters into the X-Y coordinate system are displayed on the CRT 4 (indicated by a symbol). At this time, the second
As shown in Figure (a), the detection beam current value is displayed on the CRT 4.

When displaying the values obtained by converting the adjustment parameters into a two-axis coordinate system on the CRT 4, the mutually related components of the cyclotron 1 are set in advance, and the control amounts of these components are For example, let the amount of current flowing through the first to third electromagnets of the cyclotron 1 be Q, Q, and Q3, respectively, and the amount of current Q
If t+Q3 and the current amount Q2 are related to each other, then Q is shown on the X axis.
Let's take l-tQ, and put Q2 on the Y axis. Therefore, in this case, if the adjustment parameters of the first to third electromagnets are P, , P, and P, respectively, the conversion equation to the two-axis coordinate system is expressed by equation (3).

(3) Therefore, if there are other mutually related components of Cyclo 1-Lon 1, a plurality of X-Y coordinate systems will be displayed on the CRTJ.

The operator looks at the correlation coefficient and beam current detection value displayed on the CRT 4 and adjusts to the optimum particle beam.

That is, when adjusting the particle beam, adjustment parameters are changed.

Here, to explain based on equation (3), when the adjustment parameter P2 is changed, this changed parameter is stored in the magnetic disk 2C, and the CPU 2a changes the adjustment parameter P2 based on the adjustment parameter (P, , P2', P3). , find the plot point of the X-Y coordinate system, and put this plot point on the CRT4
Display separately from plot points.

If this plot point moves in a direction away from the plot group (indicated by +) shown in FIG. 2(b), it is understood that the Nu parameters p, , p, must also be changed.

Therefore, in this case, the adjustment parameters P1P2. It turns out that we have to adjust and P. In other words, in the past, each adjustment parameter was simply expressed numerically independently, so when many adjustment parameters are related to each other, it is difficult to determine which adjustment parameter should be changed in order to obtain the optimal particle beam. Although it is not obvious just by looking at the display screen, in the case of this example, the cross-correlation of each adjustment parameter is displayed on a two-axis coordinate system, so the plot points after the change will move away from the past Prob 1 group. You can immediately see from the display screen which adjustment parameters should be changed depending on whether the

(Effects of the Invention) As explained above, in the present invention, adjustment parameters are converted into a two-axis coordinate system and a cross-correlation diagram is displayed. It is immediately known which adjustment parameters need to be changed, and as a result, it is extremely easy to change the parameters to obtain an optimal particle beam.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining an embodiment of the adjustment parameter display setting device according to the present invention, FIG. 2(a) is a diagram showing detected beam current values displayed on the display, and FIG.
b) is a cross-correlation diagram for showing the cross-correlation of adjustment parameters. ■... Accelerator system, 2... Control computer system, 3... Parameter input device, 11... Display (CR'r')

Claims (1)

[Claims] 1 Used to set and display multiple adjustment parameters used when controlling the operation of a charged particle beam accelerator,
a storage means for storing the adjustment parameters; a display means for displaying the adjustment parameters on a two-axis coordinate system; a setting means for setting the adjustment parameters; and a calculation means for converting the adjustment parameter into the two-axis coordinate system using a relational coefficient, and converting the conversion value of the adjustment parameter currently used for operation control of the charged particle beam accelerator and other adjustment parameters. A device for displaying and setting adjustment parameters for a charged particle beam accelerator, characterized in that the adjustment parameters are displayed in a manner that distinguishes between values.