From: A model for preemptive maintenance of medical linear accelerators—predictive maintenance
No. | PARAMETER | ERROR DESCRIPTION | ERROR LEVEL | DETECTION |
---|---|---|---|---|
1 | PFN High Voltage Power Supply Current (A) | 5 % based on operating ranges | 1.05 | YES |
2 | PFN Actual Voltage (KV) | 5 % based on operating ranges | 1.05 | YES |
3 | RF Driver Voltage (V) | 1STD | 0.5 | YES |
4 | RF Forward Power (W) | 1STD | 0.11 | YES |
5 | AFC Error (V) | 1STD | 0.03 | YES |
6 | Gun Current (A) | No change—add | 0 | N/A |
7 | Gun High Voltage (V) | 1STD | 559 | YES |
8 | Gun Grid Voltage (V) | 1STD | 7.94 | YES |
9 | Gun Filament Step Voltage (V) | Half of minor fault change | 0.1 | YES |
10 | Gun Filament Voltage (V) | Half of minor fault change | 0.1 | YES |
11 | Bend Magnet Current (A) | 1 % change | 1.01 | YES |
12 | Bend Magnet Voltage (V) | 5 % change | 1.05 | YES |
13 | Accelerator Solenoid Current (A) | 1STD | 1 | YES |
14 | Klystron Solenoid Current (A) | .100 A change | 0.1 | YES |
15 | Radial Symmetry (%) | 0.5 % added | 0.5 | YES |
16 | Transverse Symmetry (%) | 0.5 % added | 0.5 | YES |
17 | Target Current (nC) | 1STD | 11 | YES |
18 | Buncher Radial Current (A) | 1STD | 0.13 | YES |
19 | Buncher Transverse Current (A) | 1STD | 0.1 | YES |
20 | Angle Radial Current (A) | Shift/add 0.2 A | 0.2 | YES |
21 | Angle Transverse Current (A) | Shift/add 0.2 A | 0.2 | YES |
22 | Position Radial Current (A) | Shift/add 0.2 A | 0.2 | NO |
23 | Position Transverse Current (A) | Shift/add 0.2 A | 0.2 | YES |
24 | Trim: (A) | 1STD | 0.055 | YES |
25 | Accelerator Vacion Current (uA) | Add .1 % of Vac2 fault value | 0.007 | YES |
26 | Positive 5 V dc | Shift/add 0.1 V | 0.1 | YES |
27 | Positive 24 V dc | Shift/add 0.1 V | 0.1 | NO |
28 | Analog Negative 5 V dc | Shift/add 0.1 V | 0.1 | YES |
29 | Analog Positive 5 V dc | Shift/add 0.1 V | 0.1 | YES |
30 | Negative 12 V dc | Shift/add 0.1 V | 0.1 | YES |
31 | Positive 3 V dc | Shift/add 0.1 V | 0.1 | YES |
32 | Node Power Supply Voltage (V) | Shift/add 0.1 V | 0.1 | YES |
33 | Water Level | No change—add | 0 | N/A |
34 | Internal Water Supply Temperature (deg C) | 1 degree change | 1 | YES |
35 | Gas Pressure (PSI) | 1 psi | 1 | YES |
36 | Y1 | Add 0.2 cm | 0.2 | YES |
37 | Y2 | Add 0.2 cm | 0.2 | YES |
38 | X1 | Add 0.2 cm | 0.2 | YES |
39 | X2 | Add 0.2 cm | 0.2 | YES |
40 | Carriage A | Add 0.2 cm | 0.2 | YES |
41 | Carriage B | Add 0.2 cm | 0.2 | YES |
42 | Gantry—Speed 1, Speed 2 | Add 0.2 deg/sec | 0.2 | YES |
43 | Gantry—cross-correlation max value | Shift 10 snapshots | 0.2 deg | YES |
44 | Gantry—location of cross-correlation max value | Shift 10 snapshots | 0.2 deg | NO |
45 | MLC Bank A (60 leaves)—each leaf: Speed 1, Speed 2 | Add 0.1 cm/sec | 0.1 | YES |
46 | MLC Bank B (60 leaves)—each leaf: Speed 1, Speed 2 | Add 0.1 cm/sec | 0.1 | YES |
47 | MLC Bank A (60 leaves)—each leaf: cross-correlation max value | Shift 2 snapshots | 1 mm | NO |
48 | MLC Bank A (60 leaves)—each leaf: location of cross-correlation max value | Shift 2 snapshots | 1 mm | YES |
49 | MLC Bank B (60 leaves)—each leaf: cross-correlation max value | Shift 2 snapshots | 1 mm | NO |
50 | MLC Bank B (60 leaves)—each leaf: location of cross-correlation max value | Shift 2 snapshots | 1 mm | YES |