# Presentation: 910814

## The SNS Electron Detector System Status Update  J. Gullotta

- SNS Electron Detectors

- February 2004

## March ‘03 Review Comments

**Critical Findings / Action Items**
-         **None**
** **
**Committee Observation **– There were **no actual measurements** of electrons in an accelerator with this **final detector design**, but the committee believes that it should work.
**Recommendation  **– **Obtain data** using these detectors in an operating accelerator as soon as possible.
**Action – Further attempts to take data at RHIC are being made. Good news (?) is that it is very difficult to see electron cloud in RHIC  **
**Committee Observation **– The electronics design incorporates a **battery** to provide detector bias and through which the desired signals must propagate.
**Recommendation  **– **Eliminate** the battery if at all possible, especially in the machine tunnel. One solution might be to send a DC bias down the signal cable and use a DC block.
**Action – Elimination of battery.  DC power supply design will be tested at RHIC soon.**
**Committee Observation **– An **oscilloscope card** is proposed for the detector electronics. Does the card have the required gain and attenuation?
**Recommendation  **– Insure that the selected oscilloscope card has the **appropriate ranges**.
**Action – Switchable in-line attenuators will ensure input range compliance.**

- SNS Electron Detectors

- February 2004

## AP Requirements

- SNS Electron Detectors

- February 2004

## SNS Electron Detector

_**Based on ANL- APS Design (Rosenberg)**_
_**Status**_
-    **Several detectors installed in RHIC**
**   ****Shielding successfully eliminates beam pickup**
**   ****New detectors in the shops at BNL**

- APS ED, no shield

- SNS Electron Detectors

- February 2004

## Delivery Dates

- Power supplies: Grid Bias and Collector Bias  	October 2004
- Amplifier/Attenuator Network  			January 2005
- PC incl necessary peripherals				January 2005
- Detectors						August 2004
- Rack Wiring						January 2005

- SNS Electron Detectors

- February 2004

## Material Expenditures

|   | Unit |   | % Funds | Residual | Expended |
| --- | --- | --- | --- | --- | --- |
| Electron Detector System | Cost | Qty | Left | Cost | Cost |
| Detectors | 1000 | 7 | 100 | 7000 | 0 |
| Amplifiers/Attenuators | 1940 | 4 | 0 | 0 | 7760 |
| Grid Power Supplies | 400 | 5 | 95 | 1900 | 100 |
| Collector Power Supplies | 400 | 5 | 95 | 1900 | 100 |
| Rack Mount PC | 5000 | 1 | 100 | 5000 | 0 |
| Rack Wiring | 2000 | 1 | 100 | 2000 | 0 |
| PCI Digitizer Cards | 6800 | 3 | 0 | 0 | 20350 |
|   |   |   | TOTAL | 17800 | 28310 |

***Material Expenditures***

- SNS Electron Detectors

- February 2004

## Man-hours to Complete

| Detector Assembly and Testing |  |  | 60 |
| --- | --- | --- | --- |
| Amplifier/Attenuator Testing |  |  | 60 |
| Rack Mount PC Development |  |  | 80 |
| Power Supply Development and Testing |  |  | 60 |
| Documentation |  |  | 30 |
| Supervision |  |  | 20 |
| Installation Support |  |  | 30 |
|  | Total |  | 340 |

- SNS Electron Detectors

- February 2004

## Handoff Requirements

|  | FROM | Tested By | Installed By |
| --- | --- | --- | --- |
| Electron Detectors | BNL/Vendor | BNL | ORNL |
| Electron Detector Software | BNL | BNL | ORNL |
| Grid PS | BNL/Vendor | BNL | ORNL |
| Collector PS | BNL/Vendor | BNL | ORNL |
| Signal Processing Hardware | BNL | BNL | ORNL |
| Rack Mount PCs | BNL/Vendor | BNL/ORNL | ORNL |
| Inter-Rack Cabling | BNL/Vendor | ORNL | ORNL |
| Racks | ORNL | ORNL | ORNL |

- SNS Electron Detectors

- February 2004