# Presentation: 226810

## Beam Loss Monitor System Status Update

- February 2004

## Loss Monitor Detector Types

- BLMs
- Ion Chambers
- 295 units designed by BNL provided by vendor (LND)
- Linac, HEBT, Ring, RTBT
- Neutron Detectors
- Scintillator/Photo-multiplier
- 30 units provided by INR
- MEBT through SCL
- FBLMs
- For observing mini-bunch loss structure
- Bare Photo-multiplier
- 18 units provided by BNL
- HEBT, Ring, RTBT

- February 2004

## Typical AFE and IOC Crates

- AFE Crate with 4 Modules
- (32 channels)

- February 2004

## Diagnostic Review Committee Observations 3/03

- _Cabling Design: _Not sufficient detail
_**Action:**_  Now complete
- _Neutron Detectors: _New requirement and limited design information. Use of Russian PMT raises concerns about replacement availability.
- Need to look for alternate PMT
_**Action:**_ Ludlum Measurements makes similar detector
- _X-ray sensitivity of BLMs near RF cavities:_
_**Action**_**:** Study of lead thickness done but no testing yet (manpower)
- _Concern about schedule for IC procurement: _
_**Action:**_ Sole source approved. No schedule problem

- February 2004

## BLM System Status

- Ion Chamber
- 9 pre-production units delivered for DTL test (September 2003)
- 30 production units delivered late December 2003 (separate contract)
- Testing of 30 units in process with upgraded automated BLM test stand
- Sole source contract for 295 units awarded October 2003 to LND, Inc.
- Detectors to be delivered at 80/month
- BNL will do acceptance (3-point) testing
- Prefer to also do calibration (not in hand-off agreement or manpower estimate)
- AFE Crate and Modules
- Prototype AFE modules and crate used in DTL-1 testing Sept 2003.
- 2 “First Article” AFE crates, remainder of order due in February
- Crate with 4 pre-production AFE modules to ORNL March 2004
- MPS Comparator Module
- Prototype installed and tested at ORNL Sept 2003
- PCB fabrication in process
- Ship modules to ORNL March 2004

- February 2004

## BLM System Status (Cont’d)

- HV Power Supply (VME)
-  36 of 46 HV PS shipped to ORNL
- FBLMs
- Prototypes delivered to ORNL for DTL testing Sept 2003
- PMTs and magnetic shields to be ordered in February
- Bases due for delivery in February
- Ship to ORNL end of May 2004
- Movable BLM Stands
- Prototype delivered to ORNL for DTL testing Sept 2003
- Production drawings nearly complete
- Fabrication of 20 units by BNL
- To be assembled at ORNL

- Movable BLM Stand

- February 2004

## BLM System Status (Cont’d)

- Neutron Detectors
- INR will supply 30 units
- PMTs of Russian design
- First 3 units used in DTL tests
- Use same AFE and digitizers as Ion Chamber BLMs
- Remainder to be delivered  April 04

- February 2004

- DTL Tank One** **Commissioning

-  DTL BLM system successfully installed & tested with 24 mA, 100usec beam September – October
-  Insitu detector configuration:
-  7 Ion Chambers – as expected no signals, beam energy not above 30MeV ion chamber threshold
-  3 INR Neutron Detectors (PMT) – very sensitive, see slide – AFE electronics gave good signals through VME
-  2 Fast Beam Loss Monitors (PMT-no scintillator) – At this low energy PMTs had to be run at max gain
-  2 INR Neutron Detectors (solid state) – not yet tested
- MPS interface successfully tested with BLM system

- February 2004

## BLM Electronics in DTL-1 Test

- February 2004

## BLM System Signals in DTL-1 Tests

_*Noise:*_
- _ __SCR Switching_: Significantly reduced by ferrite chokes on cables. Even with lowering noise sources this system will need chokes.
-  _AC Ground_: Low level (mV) at about 200Hz. Seen on many systems.
- _ __RF_: High About 1mV peak at the highest gain setting, in synch with rf envelope.
- _ __Spurious Spikes_:  Random unipolar spikes occurring independently in both polarities. On the order of tens of mV, duration of 10-100us. Chokes help here too.

- February 2004

## Delivery Schedule

- Note: This schedule implies ORNL manpower support as BNL will not be able to support installation

- February 2004

## BLM  Hand-off Responsibilities

|  | FROM | Tested By | Installed By |
| --- | --- | --- | --- |
| BLM Detectors | BNL/Vendor | BNL/ORNL | ORNL |
| BLM and AFE Test Software (LabView) | BNL | - | - |
| Detector Mounts | Linac- ORNL
HEBT- BNL/ORNL
Ring- BNL/ORNL
RTBT- BNL/ORNL | - | ORNL |
| HV PS | BNL/Vendor | BNL | ORNL |
| AFE Modules and Crates | BNL/Vendor | BNL | ORNL |
| VME Modules and Crates (Controls) | BNL Controls | BNL | ORNL Controls |
| Inter-Crate Cabling | BNL/Vendor | ORNL | ORNL |
| Racks | ORNL |  | ORNL |

- February 2004

## Material Expenditures

|   | Unit |   | % Funds | Residual | Expended |
| --- | --- | --- | --- | --- | --- |
| BLM System Production | Cost | Qty | Left | Cost | Cost |
| Ion Chambers Detectors (IC) | 1030 | 295 | 0 | 0 | 303850 |
| Analog Front End (AFE) Electronics  | 2609 | 38 | 75 | 74356.5 | 24785.5 |
| MPS/IF Module | 1500 | 20 | 80 | 24000 | 6000 |
| AFE Electronics Crates w/ power supply | 2500 | 14 | 60 | 21000 | 14000 |
| BLM Mounting Hardware | 133 | 169 | 100 | 22477 | 0 |
| Movable BLM stands and patch panels | 500 | 19 | 100 | 9500 | 0 |
| Lead Shielding for RF areas (X-rays) | 200 | 134 | 100 | 26800 | 0 |
| BLM High Voltage Bias PS  (5kV) | 2030 | 14 | 0 | 0 | 28420 |
| FBLMs |   |   |   |   |   |
| Bare Photomultiplier Det. (FBLM) | 1500 | 20 | 66 | 19800 | 10200 |
| FBLM Mounting Hardware | 250 | 20 | 100 | 5000 | 0 |
| FBLM High Voltage Bias PS | 2030 | 10 | 0 | 0 | 20300 |
| Neutron Detector Support |   |   |   |   |   |
| FBLM High Voltage Bias PS | 2030 | 16 | 0 | 0 | 32480 |
| Analog Front End (AFE) Electronics  | 2609 | 6 | 75 | 11740.5 | 3913.5 |
| MPS/IF Module | 1500 | 5 | 80 | 6000 | 1500 |
| Support Hardware and Test Equipment | 56000 | 1 | 20 | 7000 | 49000 |
| Rack Cabling  | 700 | 14 |   | 9800 | 0 |
|   |   |   | TOTAL | 237474 | 494449 |

- February 2004

## BLM Manhours to Complete*

| BLM Detectors |  | 110 |
| --- | --- | --- |
| AFE Modules |  | 270 |
| AFE Crates |  | 80 |
| MPS-I/F |  | 110 |
| BLM Cabling |  | 20 |
| BLM Mts |  | 175 |
| FBLMs |  | 100 |
| Documentation |  | 200 |
| Supervision |  | 120 |
| Installation Support** |  |                              200 |
|  | Total | 1385 |

- *   No contingency for production problems
- ** Not in Budget

- February 2004

## Back up Material

- February 2004

## Parameter Range

- Beam current amplitude:
- Linac, HEBT:			15 to 60 mA
- Ring, RTBT:			15 mA to 60 A
- Beam current pulse width:
- Mini-pulse:			695 nsec
- Macro-pulse			1 msec
- Beam Loss
- Min  (10 sec avg)		1% of 1 W/m loss
- Max limit (1 msec pulse)		0.5% local loss
- 			  (695 nsec pulse)	0.1% local loss

- February 2004

## BLM System I/O

**Analog Readbacks**	- Fast Linear (35 kHz) in Linac, HEBT, Ring
- 	     **(via ADC)**		    or Pulse Integral  in RTBT
-          			- Slow (0.1 Hz) high sensitivity
**AFE Gain:**		- Jumpers – Gain, 100:1 in 3 steps,
- 					- Mode (Linear, Integral)
- 				- EPICs (Channel by channel)
- 					- Viewing gain x1 or x10
**Status Readbacks:**	Jumpers,
- 				- Viewing gain
- 				- Module s/n
- 				- Crate slot
- 				- AFE crate over-temp, low V

- February 2004

## Distribution of BLMs and Neutron Detectors

- February 2004