Frequently asked questionsMagnetron type number cross-reference tableAlphatron Electronic Parts B.V. confirms the position of the generic type numbers of linac magnetron versus the type numbers used by the linac manufacturers as follows:
All magnetrons supplied by Alphatron are fully form fit and functional replacements for the same types mentioned by the linac manufactures as shown in the cross-reference table by magnetron type number.
Can you use the modified CX1154L on all Elekta machines?In collaboration with Elekta there is a small design change to the grid 2 structure and the CX1154L is now filled with hydrogen, not deuterium. This results in a faster recovery time and therefore the effect is that the new design CX1154L can be used with ALL Elekta machines, even the very old ones. Modified CX1154L design introduced from s/n 28528 (WK 33 2009) can be used and retrofitted to all CX1154L & CX1154 Elekta sockets.
Can you use the thyratrons CX1154 or CX1154L in SL Series Linacs?The CX1154L is recommended for old SL75-20 machines: machine numbers < 5001. These don't have a critical timing.
CX1154L is recommended for use in all machines WITHOUT a slitted flight tube, which are machines with a serial number > 5361. The CX1154L is NOT recommended for SL15/18/20/25 which still have the slitted flight tube fitted: these are machines with a serial number from 5001 to 5361 inclusive.
In machines that have had the SLITLESS flight tube upgrade the CX1154L thyratron may be used as replacement and will fit into these machines.
The CX1154L has been fitted by Elekta into all new machines made after end of 1999. Todays Sli's machines are all standard fitted with a CX1154L thyratron. Can you use the thyratrons CX1140 and CX1140L in Varian Klystron Medical Therapy Machines?The difference between the CX1140 / CX1140L is summarised below:
Since 1999, Varian have fitted CX1140L to all their new klystron machines and recommended the CX1140L to be fitted in their whole range of klystron machines. Thyratron type CX1159 is recommended for Varian Magnetron machines.
Background: CX1140 has an average current for continuous use of 1.25A and is the tube used in the 1800C and 2100C Varian machines, where the maximum possible average current is 1.8A, but only for intermittent operation. (The actual average current varies depending which mode the machine is used in and also the operating frequency used).
From the mid 1990's, successive changes to the machines and machine operation have increased the maximum average current that the switch tube has to operate at to 2.2A. 2.2A average is too high for reliable operation of the CX1140 and this led to the development of the CX1140L.
The CX1140L essentially only differs from the CX1140 in control grid design though there are other slight changes that improve the gas flow through the tube and thereby increase internal tube cooling. The CX1140L has a faster recovery time than the CX1140 and is able to operate more reliably at the higher average current levels. The CX1140L can be retrofitted replacing the CX1140 but not visa versa. Can you use the magnetron M5028 in Elekta SLand Sli machines?e2v Technologies and Alphatron Electronic Parts B.V. confirm the M5028 magnetron can be used in the Elekta SL and Sli machines. The M5028 is fully form fit and function replacement for the MG6363 magnetron. Can you use the fast tuned magnetron MG6028 in Elekta Sli machines?e2v Technologies and Alphatron Electronic Parts B.V. confirm the MG6028 precision tuned magnetron can be used in Elekta Sli machines. The MG6028 is fully form fit and function replacement for the MG6370 magnetron. Can you use the magnetron MG5193 in Varian magnetrons machines?For the Varian machines which are normally fitted with a magnetron type MG6165, Alphatron Electronic Parts B.V. confirms the MG5193 is fully form fit and function replacement for the MG6165 magnetron. Can you use the magnetron MG5193 in Siemens Primus magnetron machines?Alphatron Electronic Parts B.V. confirms the MG5193 can be used in the new Siemens Primus machines which are normally fitted with a magnetron type MG6250. The MG5193 is fully form fit and function replacement for the MG6250 magnetron. What is the situation with the M5167 magnetron?In regards to the supply of the M5167 magnetron we can inform you that Marconi has ceased production of this type and replaced it with the MG5193. This tube is form fit and function replacement. What is more, the MG5193 has a higher average power capability than its predecessor. What is the difference between CX1140LD and CX1140L?The only difference between the CX1140LD and CX1140L is that the CX1140LD is filled with deuterium and the CX1140L is filled with hydrogen. Deuterium gives a higher voltage hold-off, with the same filling pressure, than hydrogen. The CX1140LD, therefore, is completely interchangeable with the CX1140L used today for newly built LINAC and spare parts. What magnetron replaces the discontinued MG5349 and MG5349M?e2v Technologies and Alphatron Electronic Parts B.V. advise its customers of the discontinuation of magnetron products MG5349 and MG5349M. These products have been superseded by magnetron MG6090, which e2v and Alphatron consider as a direct replacement that includes performance enhancements.
Performance enhancements - MG6090 series The MG6090 series of magnetrons have been developed to replace the MG5349 series of products. Designed specifically for linear accelerator use, these new magnetrons are RoHS compliant and robust. For transport considerations, the MG6090 magnetron is able to withstand a shock of up to 101G in magnitude; three times that of the MG5349 series predecessors. In addition, high voltage leads and connectors have been upgraded to minimize stray microwave radiation from the product during operation.
The MG6090 series magnetrons are not supplied with HT cable assemblies, as their designs tend to be specific to each system configuration. These cables have OEM specific part numbers:
|
