HV needs for TOF and Trigger counters


This document summarized the HV needs for the TOF and trigger counters. The slot assignments of the HV mainframe are as follows:

HV Slot

Module

Detector

Operating conditions

0

1461P

TOF

800 - 900 V, 0.3 mA

1

1461P

TOF

800 - 900 V, 0.3 mA

2

1461P

TOF

800 - 900 V, 0.3 mA

3

1461P

TOF

800 - 900 V, 0.3 mA

4

1461P

TOF

800 - 900 V, 0.3 mA

5

1461P

TOF

800 - 900 V, 0.3 mA

6

1461P

TOF

800 - 900 V, 0.3 mA

7

1461P

TOF

800 - 900 V, 0.3 mA

8

1461P

TOF

800 - 900 V, 0.3 mA

9

1461P

TOF

800 - 900 V, 0.3 mA

10

1461N

Ring Counters

1000 V, 0.35 mA

11

1461N

Ring Counters

1000 V, 0.35 mA

12

1461N

Ring Counters

1000 V, 0.35 mA

13

1461N

Paddle Counters

1500 V, 1 mA

14

1461N

Paddle Counters

1500 V, 1 mA

15

1461N

Paddle Counters

1500 V, 1 mA


Power requirements:

The mainframe being used for the TOF and Trigger counters is the medium power model of the 1458 series. It contains a 60 A, 24 Vpower supply. With all slots filled, it is in principle possible that the power needs of the cards exceed the power supplied by the mainframe. In our application, the current requirements are well below the maximum current that can be provided by the HV mainframe.

In order to evaluate the power needs in our application, which is entire based on the model 1461 HV cards, we use the following current information for the 1461 card:

171 mA supply per mA output + 38 mA supply per channel:

Applying this information we estimate the following current needs:

The total current required to run the TOF and the Trigger counters is thus 20.5 A, which is well below the maximum current of 60 A which can be supplied by the mainframe.