Central Cathode High Voltage control

1

Documentation for the Central Cathode High Voltage control through MSCB

Purpose

The GPIB/MSCB interface provides monitoring and control to the BERTAN HV power supplies.

Description

The Bertan 30KV unit is controlled through the GPIB port. The GPIB address is set to 4 by default. The main MSCB variables are:

• Voltage setting (Udemand V)
• Ramp up voltage rate (RampUp V/s)
• Ramp down voltage rate (RampDown V/s)
• Upper voltage limit (Ulimit V)
• Upper Current limit (Ilimit uA)

• There is a CCBERTAN MSCB/GPIB interface for each TPC (1, 2, 3). The model of the interface can be either CCBERTAN410 or CCBERTAN310 refering to the micro-computer of the interface. Each unit has to have a unit MSCB address (1, 2, 3). A spare unit sit on the top of the TPC3, its MSCB address is 4.

Card Operation

• The frontend code handling the monitoring and the control is call feccbertan.c. It resides on the t2ktpcgsc:online/gsc/tpc. The image name is feccbertan.exe. A custom web page for the control is available (ccbertan.html).

MSCB Registers

        0: Status     8bit U              32 (0x20/00100000) byte
           Ramp up state                      0x01
           Ramp down state                    0x02
           Voltage limit reached              0x04
           Current limit reached              0x08
           Low current state                  0x10
           High current state                 0x20
        1: Udemand   32bit F               0 volt
        2: Umeas     32bit F               0 volt
        3: Imeas     32bit F               0 ampere
        4: RampUp    16bit U              50 (0x0032) volt
        5: RampDown  16bit U              50 (0x0032) volt
        6: Ulimit    32bit F           28000 volt
        7: Ilimit    32bit F              75 microampere
        8: warning   STR32    "Warning! High current -  x.xxxx"

Location

SS level in the TPC rack. 3 BERTAN units with corresponding ccbertan MSCB interface. Fourth one on the top of the BERTAN-TPC3

DataSheets

MSCB-GPIB_Rev2 schematics
Bertan HV unit